JP7712803B2 - Wastewater treatment device and wastewater treatment method - Google Patents
Wastewater treatment device and wastewater treatment methodInfo
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- JP7712803B2 JP7712803B2 JP2021111277A JP2021111277A JP7712803B2 JP 7712803 B2 JP7712803 B2 JP 7712803B2 JP 2021111277 A JP2021111277 A JP 2021111277A JP 2021111277 A JP2021111277 A JP 2021111277A JP 7712803 B2 JP7712803 B2 JP 7712803B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Description
本発明は排水処理装置及び排水処理方法に関する。 The present invention relates to a wastewater treatment device and a wastewater treatment method.
従来より、排水に含まれるアンモニアを酸素存在下において亜硝酸や硝酸に変換する硝化反応と、亜硝酸や硝酸を無酸素状態で窒素に変換する脱窒反応と、を単一の反応槽で実行する排水処理装置が知られている（例えば、特許文献１参照）。特許文献１の排水処理装置において、反応槽は、硝化反応を実行する硝化反応領域と、脱窒反応を実行する脱窒反応領域と、に区分する仕切板を備え、硝化反応領域は硝化反応及び脱窒反応が実行された汚水（以下、「処理済水」という。）に含まれる固形分を分離除去する膜分離装置と、膜分離装置の表面を洗浄し又は硝化反応に必要な空気を供給するための気泡を散気する散気装置と、を有する。 Conventionally, wastewater treatment equipment is known that performs a nitrification reaction, which converts ammonia contained in wastewater into nitrite and nitrate in the presence of oxygen, and a denitrification reaction, which converts nitrite and nitrate into nitrogen in an oxygen-free state, in a single reaction tank (see, for example, Patent Document 1). In the wastewater treatment equipment of Patent Document 1, the reaction tank is equipped with a partition plate that divides it into a nitrification reaction area where the nitrification reaction is performed and a denitrification reaction area where the denitrification reaction is performed, and the nitrification reaction area has a membrane separation device that separates and removes solids contained in the wastewater in which the nitrification reaction and denitrification reaction have been performed (hereinafter referred to as "treated water"), and an aeration device that cleans the surface of the membrane separation device or diffuses air bubbles to supply air necessary for the nitrification reaction.
汚水の水位が仕切板の上端よりも高いとき、汚水は仕切板を越流して硝化反応領域から脱窒反応領域に移動するとともに、脱窒反応領域から硝化反応領域に戻る。これにより、仕切板の周囲を循環する循環流が形成される。したがって、硝化反応領域において生成された亜硝酸や硝酸は脱窒反応領域に移動し、脱窒反応領域において窒素に変換される。一方、汚水の水位が仕切板の上端よりも低いとき、汚水は仕切板を越流しない。したがって、循環流は形成されず、硝化反応領域では亜硝酸や硝酸が生成され、脱窒反応領域では予め硝化反応領域から脱窒反応領域に移動した亜硝酸や硝酸が窒素に変換される。 When the wastewater level is higher than the top of the partition, the wastewater overflows the partition and moves from the nitrification reaction area to the denitrification reaction area, and from the denitrification reaction area back to the nitrification reaction area. This creates a circulating flow around the partition. Therefore, the nitrite and nitrate generated in the nitrification reaction area move to the denitrification reaction area, where they are converted to nitrogen. On the other hand, when the wastewater level is lower than the top of the partition, the wastewater does not overflow the partition. Therefore, no circulating flow is formed, and nitrite and nitrate are generated in the nitrification reaction area, while in the denitrification reaction area, the nitrite and nitrate that have previously moved from the nitrification reaction area to the denitrification reaction area are converted to nitrogen.
ところで、散気装置は、例えば、空気径２０～５００μｍの微小な気泡を多量に硝化反応領域に供給する。硝化反応領域に散気された微小な気泡に含まれる酸素が汚水に溶解し、硝化反応に必要な溶存酸素濃度が確保される。 The air diffuser supplies a large amount of tiny air bubbles, for example with an air diameter of 20 to 500 μm, to the nitrification reaction area. The oxygen contained in the tiny air bubbles diffused into the nitrification reaction area dissolves in the wastewater, ensuring the dissolved oxygen concentration required for the nitrification reaction.
しかしながら、散気装置は硝化反応領域に設置された膜分離装置に対して微小な気泡を散気するため、微小な気泡は膜分離装置を通過するに従って合体し、大きな気泡を形成する。大きな気泡は汚水に溶解しにくいため、硝化反応に必要な溶存酸素濃度が確保されず、硝化反応を効率的に実行することができないという問題があった。 However, because the aeration device diffuses tiny bubbles toward the membrane separation device installed in the nitrification reaction area, the tiny bubbles coalesce as they pass through the membrane separation device to form larger bubbles. Since larger bubbles are less likely to dissolve in wastewater, the dissolved oxygen concentration required for the nitrification reaction is not ensured, and the nitrification reaction cannot be carried out efficiently.
本発明は、硝化反応を効率的に実行することができる排水処理装置及び排水処理方法を提供することを目的とする。 The present invention aims to provide a wastewater treatment device and a wastewater treatment method that can efficiently carry out nitrification reactions.
上記目的を達成するために、本発明の排水処理装置は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行する排水処理装置において、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、湾曲若しくは屈曲しているか、又は、鉛直方向に関して傾斜している区分手段を備え、前記硝化反応領域は、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備えることを特徴とする。
また、上記目的を達成するために、本発明の排水処理装置は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行する排水処理装置において、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、前記排水処理装置に設定されている最高水位及び最低水位の間に位置する一端部、並びに、前記排水処理装置の底部近傍に位置する他端部を有する区分手段を備え、前記他端部に囲まれた面積は、前記一端部に囲まれた面積の１２５％以上３５０％以下であり、前記硝化反応領域は、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備えることを特徴とする。
また、上記目的を達成するために、本発明の排水処理装置は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行する排水処理装置において、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段を備え、前記硝化反応領域は、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、前記脱窒反応を実行する脱窒反応領域は前記排水処理装置の内壁から前記区分手段に対して突出する整流部材を有することを特徴とする。
In order to achieve the above-mentioned object, the wastewater treatment device of the present invention performs a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced based on the nitrification reaction is converted into nitrogen in an oxygen-free state , and is characterized in that the wastewater treatment device is provided with a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, the partitioning means being curved or bent, or inclined with respect to the vertical direction , and the nitrification reaction area is provided with a membrane separation device for separating solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction, a first aeration means for moving the wastewater upward in the vertical direction and diffusing bubbles which clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing bubbles which pass around the membrane separation device and collide with the partitioning means.
In order to achieve the above object, the wastewater treatment device of the present invention performs a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced by the nitrification reaction is converted into nitrogen in an anoxic state, the partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed comprises one end located between a maximum water level and a minimum water level set in the wastewater treatment device, and a partitioning means for partitioning a nitrification reaction area in which the denitrification reaction is performed, the partitioning means being disposed in the vicinity of a bottom of the wastewater treatment device. the other end being 125% or more and 350% or less of the area surrounded by the one end, and the nitrification reaction area comprises a membrane separation device which separates solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction, a first aeration means which moves the wastewater upward in the vertical direction and diffuses air bubbles which clean the membrane separation device, and a second aeration means which moves the wastewater upward in the vertical direction and diffuses air bubbles which pass around the membrane separation device and collide with the division means.
In order to achieve the above object, the wastewater treatment device of the present invention performs a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced based on the nitrification reaction is converted into nitrogen in an oxygen-free state, and the device is provided with a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, the nitrification reaction area being provided with a membrane separation device for separating solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction, a first aeration means for moving the wastewater upward in the vertical direction and diffusing bubbles which clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing bubbles which pass around the membrane separation device and collide with the partitioning means, and the denitrification reaction area in which the denitrification reaction is performed has a straightening member protruding from an inner wall of the wastewater treatment device toward the partitioning means .
上記目的を達成するために、本発明の排水処理方法は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行するとともに、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離除去する膜分離装置を備える排水処理装置によって実行される排水処理方法において、前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、湾曲若しくは屈曲しているか、又は、鉛直方向に関して傾斜している区分手段を備え、前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、前記排水処理方法は、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする。
また、上記目的を達成するために、本発明の排水処理方法は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行するとともに、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離除去する膜分離装置を備える排水処理装置によって実行される排水処理方法において、前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、前記排水処理装置に設定されている最高水位及び最低水位の間に位置する一端部、並びに、前記排水処理装置の底部近傍に位置する他端部を有する区分手段を備え、前記他端部に囲まれた面積は、前記一端部に囲まれた面積の１２５％以上３５０％以下であり、前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、前記排水処理方法は、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする。
また、上記目的を達成するために、本発明の排水処理方法は、排水に含まれるアンモニアを酸素存在下において亜硝酸又は硝酸に変換する硝化反応と、前記硝化反応に基づいて生成された亜硝酸又は硝酸を無酸素状態において窒素に変換する脱窒反応と、を実行するとともに、前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離除去する膜分離装置を備える排水処理装置によって実行される排水処理方法において、前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段を備え、前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、前記脱窒反応領域は前記排水処理装置の内壁から前記区分手段に対して突出する整流部材を有し、前記排水処理方法は、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする。
In order to achieve the above object, the wastewater treatment method of the present invention is a wastewater treatment method which performs a nitrification reaction in which ammonia contained in the wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced by the nitrification reaction is converted into nitrogen in an anoxic state, and is performed by a wastewater treatment device which is equipped with a membrane separation device which separates and removes solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction. The wastewater treatment device includes a dividing means which divides a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, the dividing means being curved, bent, or inclined with respect to the vertical direction. the nitrification reaction area comprises the membrane separation device, a first aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the division means, and the wastewater treatment method is characterized by having a first aeration step for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration step for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device.
In order to achieve the above object, the wastewater treatment method of the present invention is a wastewater treatment method which performs a nitrification reaction for converting ammonia contained in the wastewater into nitrite or nitrate in the presence of oxygen, and a denitrification reaction for converting the nitrite or nitrate produced by the nitrification reaction into nitrogen in an oxygen-free state, and is performed by a wastewater treatment device which is equipped with a membrane separation device for separating and removing solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction. The wastewater treatment device has a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, the partitioning means having one end located between a maximum water level and a minimum water level set in the wastewater treatment device, and another end located near the bottom of the wastewater treatment device. the wastewater treatment method is characterized in that it comprises a dividing means for dividing the wastewater into two portions, the area surrounded by the other end being 125% or more and 350% or less of the area surrounded by the one end, the nitrification reaction area comprises the membrane separation device, a first aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the dividing means, and the wastewater treatment method comprises a first aeration step for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration step for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device.
In order to achieve the above object, the wastewater treatment method of the present invention is a wastewater treatment method which performs a nitrification reaction of converting ammonia contained in the wastewater into nitrite or nitrate in the presence of oxygen, and a denitrification reaction of converting the nitrite or nitrate produced by the nitrification reaction into nitrogen in an anoxic state, and is performed by a wastewater treatment device which is equipped with a membrane separation device which separates and removes solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction. The wastewater treatment device is equipped with a partitioning means which partitions a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, and the nitrification reaction area is a partitioning means which partitions the wastewater by separating ... and a first aeration means for diffusing air bubbles which move upward in the wastewater in the vertical direction and clean the membrane separation device, and a second aeration means for diffusing air bubbles which move upward in the wastewater in the vertical direction, pass around the membrane separation device and collide with the division means, wherein the denitrification reaction area has a straightening member which protrudes from an inner wall of the wastewater treatment device toward the division means, and the wastewater treatment method is characterized by comprising: a first aeration step for moving upward in the vertical direction through the wastewater and diffusing air bubbles which clean the membrane separation device, and a second aeration step for moving upward in the vertical direction through the wastewater and diffusing air bubbles which pass around the membrane separation device.
本発明によれば、硝化反応を効率的に実行することができる。 According to the present invention, the nitrification reaction can be carried out efficiently.
以下、本発明の実施の形態について図面を参照しながら詳述する。 The following describes in detail the embodiments of the present invention with reference to the drawings.
図１は、本発明の実施の形態に係る排水処理装置１０の構成を示す概略図である。 Figure 1 is a schematic diagram showing the configuration of a wastewater treatment device 10 according to an embodiment of the present invention.
図１の排水処理装置１０は原水槽１、反応槽２、ポンプＰ１，Ｐ２、液面センサーＬＳ、ブロワＢを備え、反応槽２は膜分離装置３、散気装置４、仕切板５（区分手段）及び整流板６（整流部材）を有し、原水槽１及びポンプＰ１、ポンプＰ１及び液面センサーＬＳ、ブロワＢ及び散気装置４、並びに、ポンプＰ２及び膜分離装置３が接続されている。 The wastewater treatment device 10 in Figure 1 is equipped with a raw water tank 1, a reaction tank 2, pumps P1 and P2, a liquid level sensor LS, and a blower B. The reaction tank 2 has a membrane separation device 3, an aeration device 4, a partition plate 5 (dividing means), and a straightening plate 6 (straightening member), and the raw water tank 1 and pump P1, pump P1 and the liquid level sensor LS, blower B and the aeration device 4, and pump P2 and the membrane separation device 3 are connected.
原水槽１は反応槽２に供給するための被処理水を貯留する。反応槽２は原水槽１から供給された被処理水に、被処理水に含まれるアンモニアを酸素存在下において亜硝酸や硝酸に変換する硝化反応及び亜硝酸や硝酸を無酸素状態で窒素に変換する脱窒反応を施す。硝化反応は微生物を含む有機汚泥（以下、「活性汚泥」という）である硝化菌によって実行され、脱窒反応は活性汚泥である脱窒菌によって実行される。反応槽２には原水槽１からの被処理水の供給を停止する最高水位ＨＷＬ及び原水槽１からの被処理水の供給を開始する最低水位ＬＷＬが設定され、例えば、液面センサーＬＳが被処理水の水位に関して最低水位ＬＷＬを検出したとき、ポンプＰ１が駆動して原水槽１から反応槽２への被処理水の供給が開始され、液面センサーＬＳが被処理水の水位に関して最高水位ＨＷＬを検出したとき、ポンプＰ１が停止して原水槽１から反応槽２への被処理水の供給が停止される。 The raw water tank 1 stores the water to be treated to be supplied to the reaction tank 2. The reaction tank 2 performs a nitrification reaction, which converts ammonia contained in the water to be treated into nitrite and nitrate in the presence of oxygen, and a denitrification reaction, which converts nitrite and nitrate into nitrogen in the absence of oxygen, on the water to be treated supplied from the raw water tank 1. The nitrification reaction is performed by nitrifying bacteria, which are organic sludge containing microorganisms (hereinafter referred to as "activated sludge"), and the denitrification reaction is performed by denitrifying bacteria, which are activated sludge. The reaction tank 2 is set with a maximum water level HWL at which the supply of the water to be treated from the raw water tank 1 is stopped, and a minimum water level LWL at which the supply of the water to be treated from the raw water tank 1 is started. For example, when the liquid level sensor LS detects the minimum water level LWL for the water level to be treated, the pump P1 is driven to start the supply of the water to be treated from the raw water tank 1 to the reaction tank 2, and when the liquid level sensor LS detects the maximum water level HWL for the water level to be treated, the pump P1 is stopped to stop the supply of the water to be treated from the raw water tank 1 to the reaction tank 2.
反応槽２は仕切板５によって２つの領域に区分される。具体的に、仕切板５に囲まれ、被処理水に硝化反応を施す硝化反応領域Ｄ１と、仕切板５及び反応槽２の側壁に囲まれ、被処理水に脱窒反応を施す脱窒反応領域Ｄ２とに区分される。膜分離装置３及び散気装置４は硝化反応領域Ｄ１に配置され、散気装置４は膜分離装置３及び反応槽２の底部の間に配置される。整流板６は脱窒反応領域Ｄ２に配置され、反応槽２の側面から仕切板５に対して突出している。 The reaction tank 2 is divided into two areas by the partition plate 5. Specifically, it is divided into a nitrification reaction area D1 surrounded by the partition plate 5, where the water to be treated is subjected to a nitrification reaction, and a denitrification reaction area D2 surrounded by the partition plate 5 and the side wall of the reaction tank 2, where the water to be treated is subjected to a denitrification reaction. The membrane separation device 3 and the aeration device 4 are disposed in the nitrification reaction area D1, and the aeration device 4 is disposed between the membrane separation device 3 and the bottom of the reaction tank 2. The baffle plate 6 is disposed in the denitrification reaction area D2, and protrudes from the side of the reaction tank 2 toward the partition plate 5.
ポンプＰ２が駆動すると、硝化反応及び脱窒反応が施された処理済水は膜分離装置３を経由して反応槽２の槽外に排出される。膜分離装置３は、例えば、複数の中空糸膜から構成され、処理済水に含まれる固形分は膜分離装置３を経由するときに分離除去される。ブロワＢは散気装置４に空気を供給し、散気装置４は、例えば、空気径２０～５００μｍの微小な空気を多量に硝化反応領域Ｄ１に散気する。 When pump P2 is driven, the treated water that has undergone nitrification and denitrification reactions is discharged outside the reaction tank 2 via membrane separation device 3. Membrane separation device 3 is composed of, for example, multiple hollow fiber membranes, and solids contained in the treated water are separated and removed as it passes through membrane separation device 3. Blower B supplies air to aeration device 4, which diffuses a large amount of minute air particles, for example with an air diameter of 20 to 500 μm, into the nitrification reaction area D1.
仕切板５の一端部（以下、「仕切板上端部５ａ」という。）は最高水位ＨＷＬ及び最低水位ＬＷＬの間に位置し、仕切板５の他端部（以下、「仕切板下端部５ｂ」という。）は反応槽２の底部近傍に位置する。被処理水の水位が最高水位ＨＷＬ及び仕切板上端部５ａの間にあるとき、被処理水は仕切板上端部５ａを越流して硝化反応領域Ｄ１から脱窒反応領域Ｄ２に移動するとともに、仕切板下端部５ｂ及び反応槽２の底部の間を経由して脱窒反応領域Ｄ２から硝化反応領域Ｄ１に戻る。これにより、仕切板５の周囲を循環する循環流が形成され、硝化反応領域Ｄ１では亜硝酸及び硝酸が硝化反応によって生成されるとともに、循環流によって脱窒反応領域Ｄ２に移動し、脱窒反応領域Ｄ２では窒素が脱窒反応領域Ｄ２に移動した亜硝酸及び硝酸に基づく脱窒反応によって生成される。 One end of the partition plate 5 (hereinafter referred to as the "partition plate upper end 5a") is located between the maximum water level HWL and the minimum water level LWL, and the other end of the partition plate 5 (hereinafter referred to as the "partition plate lower end 5b") is located near the bottom of the reaction tank 2. When the water level of the water to be treated is between the maximum water level HWL and the partition plate upper end 5a, the water to be treated overflows the partition plate upper end 5a and moves from the nitrification reaction area D1 to the denitrification reaction area D2, and returns from the denitrification reaction area D2 to the nitrification reaction area D1 via the partition plate lower end 5b and the bottom of the reaction tank 2. This forms a circulation flow that circulates around the partition plate 5, and in the nitrification reaction area D1, nitrite and nitrate are generated by the nitrification reaction and move to the denitrification reaction area D2 by the circulation flow, and in the denitrification reaction area D2, nitrogen is generated by the denitrification reaction based on the nitrite and nitrate that have moved to the denitrification reaction area D2.
被処理水の水位が最低水位ＬＷＬ及び仕切板上端部５ａの間にあるとき、循環流は形成されない。したがって、新たに硝化反応領域Ｄ１から脱窒反応領域Ｄ２に移動する亜硝酸及び硝酸はなく、硝化反応領域Ｄ１では亜硝酸及び硝酸が硝化反応によって生成され、脱窒反応領域Ｄ２では窒素が脱窒反応によって生成される。脱窒反応領域Ｄ２は硝化反応領域Ｄ１の５０体積％以上２００体積％以下、好ましくは７５体積％以上１５０体積％以下であるのがよく、これにより、硝化反応及び脱窒反応のいずれも無駄なく実行される。 When the water level of the water to be treated is between the minimum water level LWL and the upper end 5a of the partition plate, no circulation flow is formed. Therefore, no new nitrite or nitrate moves from the nitrification reaction area D1 to the denitrification reaction area D2, and nitrite and nitrate are produced by the nitrification reaction in the nitrification reaction area D1, while nitrogen is produced by the denitrification reaction in the denitrification reaction area D2. The denitrification reaction area D2 should be 50% to 200% by volume, preferably 75% to 150% by volume, of the nitrification reaction area D1, so that both the nitrification reaction and the denitrification reaction are carried out efficiently.
仕切板５において、仕切板下端部５ｂに囲まれた面積は仕切板上端部５ａに囲まれた面積よりも大きければよく、例えば、仕切板５は下端部５ｂ側が反応槽２の槽壁方向に「く」の字型に屈曲する少なくとも１つの板状部材によって構成されている。なお、仕切板５は下端部５ｂ側が反応槽２の槽壁方向に「ノ」の字型に湾曲する少なくとも１つの板状部材によって構成されてもよい（図２（ａ））。また、仕切板５は、例えば、鉛直方向及び水平方向のいずれにも傾斜する少なくとも１つの平板状部材によって錐台状に構成されてもよい（図２（ｂ））。仕切板下端部５ｂに囲まれた面積は、仕切板上端部５ａに囲まれた面積の１２５％以上３５０％以下、好ましくは１５０％以上３００％以下であるのがよい。 In the partition plate 5, the area surrounded by the lower end 5b of the partition plate may be larger than the area surrounded by the upper end 5a of the partition plate. For example, the partition plate 5 is composed of at least one plate-shaped member whose lower end 5b side is bent in a "L" shape toward the tank wall of the reaction tank 2. The partition plate 5 may also be composed of at least one plate-shaped member whose lower end 5b side is curved in a "N" shape toward the tank wall of the reaction tank 2 (FIG. 2(a)). The partition plate 5 may also be composed of at least one flat plate-shaped member that is inclined both vertically and horizontally (FIG. 2(b)). The area surrounded by the lower end 5b of the partition plate is preferably 125% to 350%, and more preferably 150% to 300%, of the area surrounded by the upper end 5a of the partition plate.
図３は、図１における反応槽２の平面図である。 Figure 3 is a plan view of the reaction tank 2 in Figure 1.
図３において、散気装置４は、膜分離装置３の直下に配置される散気装置４ａ（第１の散気手段、図４（ａ））、及び硝化反応領域Ｄ１における膜分離装置３の直下以外に配置される散気装置４ｂ（第２の散気手段、図４（ｂ））から構成される。散気装置４ｂの少なくとも１部は仕切板５の屈曲部の直下に配置される。散気装置４ａが散気する気泡は被処理水を鉛直方向に関して上向きに移動し、膜分離装置３の表面に衝突する。これにより、膜分離装置３が洗浄され、中空糸膜のファウリングが抑制される。散気装置４ｂが散気する微小な気泡は仕切板５の下部に衝突するとともに被処理水を鉛直方向に関して上向きに移動し、膜分離装置３の表面に衝突することによる気泡合体が起こらずに被処理水と接触しながら水面から放出される。 In FIG. 3, the air diffuser 4 is composed of an air diffuser 4a (first air diffuser, FIG. 4(a)) arranged directly below the membrane separation device 3, and an air diffuser 4b (second air diffuser, FIG. 4(b)) arranged other than directly below the membrane separation device 3 in the nitrification reaction area D1. At least a part of the air diffuser 4b is arranged directly below the bent part of the partition plate 5. The air bubbles diffused by the air diffuser 4a move vertically upward in the water to be treated and collide with the surface of the membrane separation device 3. This cleans the membrane separation device 3 and suppresses fouling of the hollow fiber membrane. The fine air bubbles diffused by the air diffuser 4b collide with the lower part of the partition plate 5 and move vertically upward in the water to be treated, and are released from the water surface while in contact with the water to be treated without colliding with the surface of the membrane separation device 3 to cause bubble coalescence.
図５は、図１の排水処理装置１０によって実行される排水処理の手順を示すフローチャートである。 Figure 5 is a flowchart showing the steps of the wastewater treatment performed by the wastewater treatment device 10 of Figure 1.
図５の排水処理（排水処理方法）において、まず、被処理水が原水槽１から反応槽２に供給され、反応槽２の被処理水の水位が最高水位ＨＷＬに到達したときにポンプＰ１が停止される（Ｓ１）。散気装置４ａ，４ｂは気泡を散気する（Ｓ２）。具体的に、散気装置４ａは膜分離装置３に衝突して膜分離装置３を洗浄するための気泡を散気し（第１の散気ステップ）、散気装置４ｂは膜分離装置３の周囲を通過する微小な気泡を散気する（第２の散気ステップ）。これにより、硝化反応領域Ｄ１の被処理水は仕切板上端部を越流して脱窒反応領域Ｄ２に移動するとともに、仕切板下端部５ｂ及び反応槽２の底部の間を経由して脱窒反応領域Ｄ２から硝化反応領域Ｄ１に戻り、仕切板５の周囲を循環する循環流が形成される（Ｓ３）。 In the wastewater treatment (wastewater treatment method) of FIG. 5, first, the water to be treated is supplied from the raw water tank 1 to the reaction tank 2, and when the water level of the water to be treated in the reaction tank 2 reaches the highest water level HWL, the pump P1 is stopped (S1). The air diffusers 4a and 4b diffuse air bubbles (S2). Specifically, the air diffuser 4a diffuses air bubbles that collide with the membrane separation device 3 to clean the membrane separation device 3 (first air diffusion step), and the air diffuser 4b diffuses minute air bubbles that pass around the membrane separation device 3 (second air diffusion step). As a result, the water to be treated in the nitrification reaction area D1 overflows the upper end of the partition plate and moves to the denitrification reaction area D2, and returns from the denitrification reaction area D2 to the nitrification reaction area D1 through the gap between the lower end 5b of the partition plate and the bottom of the reaction tank 2, forming a circulation flow that circulates around the partition plate 5 (S3).
循環流が形成されているとき、硝化反応領域Ｄ１では被処理水に対して硝化反応が施され、脱窒反応領域Ｄ２では被処理水に対して脱窒反応が施される。これにより、処理済水が生成され、当該処理済水は膜分離装置３を経由して反応槽２の外部に排出される。処理済水が反応槽２の外部に排出されると、被処理水の水位は下降して仕切板上端部５ａ及び最低水位ＬＷＬの間に位置し、循環流は消滅する（Ｓ４）。 When the circulation flow is formed, the nitrification reaction is performed on the water to be treated in the nitrification reaction area D1, and the denitrification reaction is performed on the water to be treated in the denitrification reaction area D2. As a result, treated water is produced, and the treated water is discharged outside the reaction tank 2 via the membrane separation device 3. When the treated water is discharged outside the reaction tank 2, the water level of the water to be treated drops to a position between the upper end 5a of the partition plate and the lowest water level LWL, and the circulation flow disappears (S4).
循環流が形成されていないときも、また、硝化反応領域Ｄ１では被処理水に対して硝化反応が施され、脱窒反応領域Ｄ２では被処理水に対して脱窒反応が施され、処理済水は膜分離装置３を経由して反応槽２の外部に排出される（Ｓ５）。被処理水の水位は最低水位ＬＷＬに到達し、ポンプＰ１が駆動して新たな被処理水が原水槽１から反応槽２に供給され（Ｓ６）、本処理は終了する。 Even when the circulation flow is not formed, the nitrification reaction is performed on the water to be treated in the nitrification reaction area D1, and the denitrification reaction is performed on the water to be treated in the denitrification reaction area D2, and the treated water is discharged outside the reaction tank 2 via the membrane separation device 3 (S5). When the water level of the water to be treated reaches the minimum water level LWL, the pump P1 is driven to supply new water to be treated from the raw water tank 1 to the reaction tank 2 (S6), and this process is completed.
図５の排水処理によれば、散気装置４ａは膜分離装置３に衝突して膜分離装置３を洗浄するための気泡を散気し、散気装置４ｂは膜分離装置３の周囲を通過する微小な気泡を散気する（Ｓ２）。散気装置４ａが散気する気泡は膜分離装置３を通過するに従って合体して気泡が巨大化するが、散気装置４ｂが散気する微小な気泡は合体することなく被処理水に接触するとともに、被処理水の水面から放出される。これにより、散気装置４ｂに基づく微小な気泡に含まれる酸素は十分に被処理水に溶解するので、硝化反応に必要な溶存酸素濃度が確保され、もって、硝化反応を効率的に実行することができる。また、散気装置４ｂに基づく微小な気泡に含まれる酸素が確実に被処理水に溶解するので、硝化反応に必要な溶存酸素濃度を迅速に確保することができ、もって、散気装置４に使用される消費電力を抑制することができる。 According to the wastewater treatment shown in FIG. 5, the air diffuser 4a diffuses air bubbles that collide with the membrane separation device 3 to clean the membrane separation device 3, and the air diffuser 4b diffuses minute air bubbles that pass around the membrane separation device 3 (S2). The air bubbles diffused by the air diffuser 4a merge and become huge as they pass through the membrane separation device 3, but the minute air bubbles diffused by the air diffuser 4b do not merge and come into contact with the water to be treated and are released from the surface of the water to be treated. As a result, the oxygen contained in the minute air bubbles based on the air diffuser 4b is sufficiently dissolved in the water to be treated, so that the dissolved oxygen concentration required for the nitrification reaction is ensured, and the nitrification reaction can be efficiently performed. In addition, the oxygen contained in the minute air bubbles based on the air diffuser 4b is reliably dissolved in the water to be treated, so that the dissolved oxygen concentration required for the nitrification reaction can be quickly ensured, and the power consumption used by the air diffuser 4 can be reduced.
本実施の形態において、仕切板５は単なる筒型形状でなく、仕切板下端部５ｂに囲まれた面積が仕切板上端部５ａに囲まれた面積の１２５％以上３５０％以下に構成されている。これにより、仕切板５の周囲に形成される循環流の規模を、効率的な硝化反応及び脱窒反応を実行可能な程度に確保しつつ、硝化反応に必要な溶存酸素濃度を確保するために用いられる散気装置４ｂの設置スペースを確保することができる。また、仕切板下端部５ｂ及び反応槽２の底部における隅部２ａ（図１）との間隔は仕切板が鉛直方向に沿って延伸する場合よりも狭いので、仕切板下端部５ｂ及び隅部２ａの間を通過する被処理水の流速がその場合よりも高速化する。これにより、脱窒菌は反応槽２の隅部に澱むことなく被処理水に分散されるので、効率的に脱窒反応が実行される。 In this embodiment, the partition plate 5 is not simply cylindrical, and the area surrounded by the lower end 5b of the partition plate is 125% to 350% of the area surrounded by the upper end 5a of the partition plate. This ensures that the scale of the circulating flow formed around the partition plate 5 is sufficient to perform efficient nitrification and denitrification reactions, while also ensuring the installation space of the air diffuser 4b used to ensure the dissolved oxygen concentration required for the nitrification reaction. In addition, the distance between the lower end 5b of the partition plate and the corner 2a (Figure 1) at the bottom of the reaction tank 2 is narrower than when the partition plate extends vertically, so the flow rate of the water to be treated passing between the lower end 5b of the partition plate and the corner 2a is faster than in that case. As a result, the denitrifying bacteria are dispersed in the water to be treated without stagnating in the corners of the reaction tank 2, so that the denitrification reaction is carried out efficiently.
なお、被処理水には硝化反応及び脱窒反応を施さなければならないが、仕切板５が反応槽２に用いられると、硝化反応領域Ｄ１は拡大し、脱窒反応領域Ｄ２は縮小する虞がある。これに対応して、本実施の形態では、硝化反応及び脱窒反応が被処理水に適切に施されるために、これまでの実績に基づいて、脱窒反応領域は硝化反応領域の５０体積％以上２００体積％以下としている。 The water to be treated must undergo nitrification and denitrification reactions, but if the partition plate 5 is used in the reaction tank 2, there is a risk that the nitrification reaction area D1 will expand and the denitrification reaction area D2 will shrink. In response to this, in this embodiment, based on past experience, the denitrification reaction area is set to 50% to 200% by volume of the nitrification reaction area so that the nitrification and denitrification reactions can be appropriately performed on the water to be treated.
ところで、本実施の形態において、脱窒反応領域Ｄ２は反応槽２の内壁から仕切板５に対して整流板６が突出している。具体的に、整流板６は仕切板５の下端部５ｂよりも上部に設置され、反応槽２の内壁から仕切板５の下部方向に突出している。整流板６は、例えば、矩形状の板であり、長辺の一端が反応槽２の内壁に固定されている。整流板６の長辺は、例えば、仕切板の横方向の幅の１／２～５／４であり、好ましくは３／４～１である。これにより、循環流が形成されているとき、旋回流が脱窒反応領域Ｄ２に発生し（図６）、脱窒菌は脱窒反応領域Ｄ２の被処理水に均一に混合されるので、効率的に脱窒反応を実行することができる。また、旋回流が脱窒反応領域Ｄ２に発生するので、脱窒反応領域Ｄ２の被処理水を撹拌するための撹拌機を脱窒反応領域Ｄ２に設置する必要がなく、無駄な消費電力が発生するのを防止することができる。 In the present embodiment, the denitrification reaction area D2 has a straightening plate 6 protruding from the inner wall of the reaction tank 2 toward the partition plate 5. Specifically, the straightening plate 6 is installed above the lower end 5b of the partition plate 5 and protrudes from the inner wall of the reaction tank 2 toward the lower side of the partition plate 5. The straightening plate 6 is, for example, a rectangular plate, and one end of the long side is fixed to the inner wall of the reaction tank 2. The long side of the straightening plate 6 is, for example, 1/2 to 5/4 of the horizontal width of the partition plate, and preferably 3/4 to 1. As a result, when a circulation flow is formed, a swirling flow is generated in the denitrification reaction area D2 (FIG. 6), and the denitrifying bacteria are uniformly mixed with the water to be treated in the denitrification reaction area D2, so that the denitrification reaction can be carried out efficiently. In addition, since a swirling flow is generated in the denitrification reaction area D2, there is no need to install an agitator in the denitrification reaction area D2 to agitate the water to be treated in the denitrification reaction area D2, and it is possible to prevent unnecessary power consumption.
以上、本発明の実施の形態について説明したが、本発明はこれらの実施の形態に何ら限定されるものではない。 The above describes the embodiments of the present invention, but the present invention is not limited to these embodiments.
１０ 排水処理装置
３ 膜分離装置
４，４ａ，４ｂ 散気装置
５ 仕切板
10 Wastewater treatment device 3 Membrane separation device 4, 4a, 4b Aeration device 5 Partition plate
Claims (6)
前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、湾曲若しくは屈曲しているか、又は、鉛直方向に関して傾斜している区分手段を備え、
前記硝化反応領域は、
前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備えることを特徴とする排水処理装置。 A wastewater treatment device that performs a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced by the nitrification reaction is converted into nitrogen in an oxygen-free state,
A partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is carried out and a denitrification reaction area in which the denitrification reaction is carried out is provided, the partitioning means being curved or bent or inclined with respect to a vertical direction;
The nitrification reaction area is
a membrane separation device that separates solids contained in the wastewater that has been subjected to the nitrification reaction and the denitrification reaction;
a first aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles for cleaning the membrane separation device;
a second aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles which pass around the membrane separation device and collide with the dividing means.
前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、前記排水処理装置に設定されている最高水位及び最低水位の間に位置する一端部、並びに、前記排水処理装置の底部近傍に位置する他端部を有する区分手段を備え、前記他端部に囲まれた面積は、前記一端部に囲まれた面積の１２５％以上３５０％以下であり、a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is carried out and a denitrification reaction area in which the denitrification reaction is carried out, the partitioning means having one end located between a maximum water level and a minimum water level set in the wastewater treatment device, and the other end located near a bottom of the wastewater treatment device, the area surrounded by the other end being 125% or more and 350% or less of the area surrounded by the one end,
前記硝化反応領域は、The nitrification reaction area is
前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、a membrane separation device that separates solids contained in the wastewater that has been subjected to the nitrification reaction and the denitrification reaction;
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、a first aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles for cleaning the membrane separation device;
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備えることを特徴とする排水処理装置。a second aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles which pass around the membrane separation device and collide with the dividing means.
前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段を備え、
前記硝化反応領域は、
前記硝化反応及び前記脱窒反応が施された排水に含まれる固形分を分離する膜分離装置と、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、
前記脱窒反応を実行する脱窒反応領域は前記排水処理装置の内壁から前記区分手段に対して突出する整流部材を有することを特徴とする排水処理装置。 A wastewater treatment device that performs a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced by the nitrification reaction is converted into nitrogen in an oxygen-free state,
A partitioning means is provided for partitioning a nitrification reaction area in which the nitrification reaction is carried out and a denitrification reaction area in which the denitrification reaction is carried out,
The nitrification reaction area is
a membrane separation device that separates solids contained in the wastewater that has been subjected to the nitrification reaction and the denitrification reaction;
a first aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles for cleaning the membrane separation device;
a second aeration means for moving the wastewater upward in a vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the separating means;
13. A wastewater treatment device comprising: a denitrification reaction zone for carrying out the denitrification reaction, the denitrification reaction zone having a straightening member protruding from an inner wall of the wastewater treatment device toward the dividing means.
前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、湾曲若しくは屈曲しているか、又は、鉛直方向に関して傾斜している区分手段を備え、
前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、
前記排水処理方法は、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする排水処理方法。 A wastewater treatment method is carried out by a wastewater treatment device which carries out a nitrification reaction in which ammonia contained in wastewater is converted into nitrite or nitrate in the presence of oxygen, and a denitrification reaction in which the nitrite or nitrate produced by the nitrification reaction is converted into nitrogen in an oxygen-free state, and which is equipped with a membrane separation device which separates and removes solids contained in the wastewater which has been subjected to the nitrification reaction and the denitrification reaction,
The wastewater treatment device includes a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is performed and a denitrification reaction area in which the denitrification reaction is performed, the partitioning means being curved or bent or inclined with respect to a vertical direction,
The nitrification reaction area includes the membrane separation device, a first aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the partitioning means,
The wastewater treatment method comprises:
A first aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles that clean the membrane separation device;
a second aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles passing around the membrane separation device.
前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段であって、前記排水処理装置に設定されている最高水位及び最低水位の間に位置する一端部、並びに、前記排水処理装置の底部近傍に位置する他端部を有する区分手段を備え、前記他端部に囲まれた面積は、前記一端部に囲まれた面積の１２５％以上３５０％以下であり、The wastewater treatment device is provided with a partitioning means for partitioning a nitrification reaction area in which the nitrification reaction is carried out and a denitrification reaction area in which the denitrification reaction is carried out, the partitioning means having one end located between a maximum water level and a minimum water level set in the wastewater treatment device, and the other end located near a bottom of the wastewater treatment device, and the area surrounded by the other end is 125% or more and 350% or less of the area surrounded by the one end,
前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、The nitrification reaction area includes the membrane separation device, a first aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the partitioning means,
前記排水処理方法は、The wastewater treatment method comprises:
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、A first aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles that clean the membrane separation device;
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする排水処理方法。a second aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles passing around the membrane separation device.
前記排水処理装置は、前記硝化反応を実行する硝化反応領域及び前記脱窒反応を実行する脱窒反応領域を区分する区分手段を備え、The wastewater treatment device includes a partitioning means for partitioning a nitrification reaction area for carrying out the nitrification reaction and a denitrification reaction area for carrying out the denitrification reaction,
前記硝化反応領域は、前記膜分離装置と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気手段と、前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過するとともに前記区分手段に衝突する気泡を散気する第２の散気手段と、を備え、The nitrification reaction area includes the membrane separation device, a first aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that clean the membrane separation device, and a second aeration means for moving the wastewater upward in the vertical direction and diffusing air bubbles that pass around the membrane separation device and collide with the partitioning means,
前記脱窒反応領域は前記排水処理装置の内壁から前記区分手段に対して突出する整流部材を有し、the denitrification reaction zone has a straightening member protruding from an inner wall of the wastewater treatment device toward the dividing means,
前記排水処理方法は、The wastewater treatment method comprises:
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置を洗浄する気泡を散気する第１の散気ステップと、A first aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles that clean the membrane separation device;
前記排水を鉛直方向に関して上向きに移動し、前記膜分離装置の周囲を通過する気泡を散気する第２の散気ステップと、を有することを特徴とする排水処理方法。a second aeration step of moving the wastewater upward in a vertical direction and diffusing air bubbles passing around the membrane separation device.
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