JP2964486B2 - Prevention method of algae generation in sedimentation basin of water purification plant - Google Patents
Prevention method of algae generation in sedimentation basin of water purification plantInfo
- Publication number
- JP2964486B2 JP2964486B2 JP15676889A JP15676889A JP2964486B2 JP 2964486 B2 JP2964486 B2 JP 2964486B2 JP 15676889 A JP15676889 A JP 15676889A JP 15676889 A JP15676889 A JP 15676889A JP 2964486 B2 JP2964486 B2 JP 2964486B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- sedimentation basin
- water purification
- purification plant
- algae
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Description
【発明の詳細な説明】 〈産業上の利用分野〉 この発明は、塩素を含んだ水が導入され、太陽に照射
される浄水場の沈殿池の水に藻類が発生するのを防止す
る方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a method for preventing the generation of algae in water of a sedimentation basin of a water purification plant where water containing chlorine is introduced and irradiated with the sun. .
〈従来の技術〉 廃水処理用の最終沈殿池のトラフに藻が発生するのを
防止するため、上からの太陽光を遮る上方遮光板と、斜
め側方からの陽差しを遮る側方遮光板とを有する屋根で
トラフを覆うことは実公昭56−33666号公報や、実公昭6
1−25915号公報で公知である。<Conventional technology> In order to prevent algae from forming in the trough of the final sedimentation basin for wastewater treatment, an upper light shield plate that blocks sunlight from above and a side light shield plate that blocks sunlight from oblique sides Covering the trough with a roof having
It is known from Japanese Patent Publication No. 1-291515.
〈発明が解決しようとする課題〉 しかし、これは廃水処理用の沈殿池に対するもので、
上水を処理する浄水場の屋外に設置された沈殿池では藻
の発生防止手段は特に講じていない。假に上記従来例の
ようにして浄水場の屋外の沈殿池を遮光板で覆うとする
と、莫大な設備費を要する。<Problems to be solved by the invention> However, this is for a sedimentation pond for wastewater treatment,
No measures are taken to prevent the generation of algae in sedimentation ponds installed outside the water treatment plant that treats clean water. If the outdoor sedimentation basin of the water purification plant is covered with a light-shielding plate as in the above-described conventional example, an enormous facility cost is required.
〈課題を解決するための手段〉 そこで本発明は、塩素を含んだ水が導入される浄水場
の沈殿池の水に藻が発生するのを有効、簡便に防止する
ため、沈殿池の塩素を含んだ水の水面にシート状、もし
くは板状の遮光性浮体を浮かべることを特徴とする。<Means for Solving the Problems> Accordingly, the present invention provides a method for effectively and easily preventing the generation of algae in the water of a sedimentation pond of a water purification plant into which water containing chlorine is introduced. It is characterized in that a sheet-shaped or plate-shaped light-shielding floating body is floated on the surface of the contained water.
〈実施例〉 浄水場での一般的な浄水の処理フローを第１図に示
す。則ち、原水（河川水）を着水井１に導入し、こゝか
らアルカリ剤、凝集剤を添加して急速撹拌池２、次に緩
速撹拌池３に導いたのち屋外の沈殿池４で沈殿処理し、
次いで濾過池５にて濾過したのち浄水池６に貯え、こゝ
から水道管で家庭などの給水栓７に分配する。そして、
従来は殺菌等を目的として次亜塩素酸ソーダ等を濾過池
５から浄水池６に流れ込む過程で注入したり（後塩素処
理法）、又は沈殿池４から濾過池５に流れ込む過程で注
入していた（中塩素処理法）。<Example> Fig. 1 shows a general flow of water purification in a water purification plant. That is, raw water (river water) is introduced into the landing well 1, an alkali agent and a coagulant are added thereto, and the mixture is led to the rapid stirring pond 2, then the slow stirring pond 3, and then to the outdoor sedimentation pond 4. Settling,
Next, the water is filtered in a filtration pond 5, stored in a water purification pond 6, and then distributed to a water tap 7 such as a household through a water pipe. And
Conventionally, sodium hypochlorite or the like is injected during the process of flowing from the filtration pond 5 to the water purification pond 6 for the purpose of sterilization or the like (post-chlorination method), or is injected during the process of flowing from the sedimentation pond 4 to the filtration pond 5. (Medium chlorination method).
しかし、近年は原水の水質の悪化にともない、水中に
アンモニア性窒素、溶存マンガン、異臭味等の生成、沈
殿池における藻類の発生が問題となり、このため、特に
アンモニア性窒素、溶存マンガンの生成に対する対策と
して原水が着水井１に流れ込む過程で原水に次亜塩素酸
ソーダを注入する前塩素処理法が多くの浄水場で採用さ
れるようになった。However, in recent years, with the deterioration of the quality of raw water, the production of ammonia nitrogen, dissolved manganese, off-flavors and the like in the water and the generation of algae in the sedimentation basin have become problems. As a countermeasure, a chlorination method of injecting sodium hypochlorite into the raw water while the raw water flows into the landing well 1 has been adopted in many water purification plants.
しかしながら、この前塩素処理法は遊離塩素と水との
接触時間が長いので、水中の有機物質濃度が高いと、こ
の有機物が水中の遊離塩素を消費し、トリハロメタンが
生成する。However, since the pre-chlorination method has a long contact time between free chlorine and water, when the concentration of the organic substance in the water is high, the organic substance consumes the free chlorine in the water and generates trihalomethane.
又、浄水場の沈殿池は通常は屋外開放型であるため太
陽光の照射を受けて藻類が発生し、この藻類に起因する
有機物が水中の塩素と反応するためトリハロメタンの生
成は更に促される。従って、前塩素処理法では、殺菌等
のために水への注入塩素量を過剰にし、水中に充分な量
の遊離塩素を保持することが必要とされ、処理にコスト
が嵩む。In addition, since the sedimentation basin of the water purification plant is usually open to the outdoors, it is irradiated with sunlight to generate algae, and the organic matter caused by the algae reacts with chlorine in the water, thereby further promoting the generation of trihalomethane. Therefore, in the pre-chlorination method, it is necessary to increase the amount of chlorine injected into water for sterilization and the like, and to maintain a sufficient amount of free chlorine in water, which increases the cost of the treatment.
そこで本発明は、前述したように、太陽に照射される
浄水場の沈殿池の塩素を含んだ水の水面にシート状、も
しくは板状の遮光性浮体を浮かべて水面を遮光すること
により藻類の発生を防止し、その結果として塩素処理に
よるトリハロメタンの生成を低減し、水中に塩素を残留
させるのである。Therefore, as described above, the present invention provides a sheet-shaped or plate-shaped light-shielding floating body on the surface of chlorine-containing water in a sedimentation basin of a water purification plant that is irradiated with the sun, thereby shielding the water surface from algae. It prevents generation and consequently reduces the production of trihalomethane due to chlorination, leaving chlorine in the water.
本発明で使用する遮光性の浮体は、水に浮き、遮光で
き、上水道の水質基準に基ずき有害な物質の溶出がない
材質、例えば硬質発泡スチロールからなるシート状のも
のでも、板状のものでもよい。The light-shielding floating body used in the present invention is a material that floats on water, can shield light, and does not elute harmful substances based on water quality standards of waterworks, for example, a sheet-like material made of hard styrofoam or a plate-like material May be.
シート状の場合は、沈殿池の水面の全体を一枚で遮光
するようにしても、隣接した複数枚で遮光するようにし
てもよい。又、保守、点検のために巻き上げ機構を使用
することが好ましい。In the case of a sheet, the entire water surface of the sedimentation basin may be shielded from light by one sheet, or may be shielded from light by a plurality of adjacent sheets. Further, it is preferable to use a hoisting mechanism for maintenance and inspection.
板状の場合は、100〜5000mm×100〜5000mm程度の大き
さの正方形や、長方形で、厚さが10〜100mm程度のもの
が取扱い上、好ましく、その複数個を有害な物質の溶出
がないロープなどで隣接状に連結して沈殿池の水面の全
体を遮光できる大きさにしたり、例えば第2,3図に示す
ように、各板８の四辺に相互に隣接する板の各辺と係合
する凹凸の係合部９…を設け、この係合部で複数枚の板
を組立てゝ水面の全体を遮光できる大きさにすればよ
い。In the case of a plate, a square or a rectangle having a size of about 100 to 5000 mm x 100 to 5000 mm and a thickness of about 10 to 100 mm is preferable in terms of handling, and a plurality of them do not elute harmful substances. The entire surface of the sedimentation basin can be shielded from light by connecting it adjacently with a rope or the like. For example, as shown in FIGS. It is sufficient to provide a plurality of engaging portions 9 having concave and convex portions to be combined, and to assemble a plurality of plates with these engaging portions so that the entire water surface can be shielded from light.
次に比較実験により確認した本発明の効果を説明す
る。Next, effects of the present invention confirmed by a comparative experiment will be described.
着水井から原水を急速撹拌池に流入させる際、凝集剤
としてPACを100mg/立添加し、急速撹拌池に３分間滞留
させ、次に緩速撹拌池に40分滞留させ、それから屋外の
沈殿池に流量0.5m3/Hr（表面負荷率9.6m3／m2.day）で
流入させ、次いで濾過池に流入させた。When raw water flows into the rapid stirring pond from the landing well, 100 mg / PAC of PAC is added as a flocculant, and the mixture is retained for 3 minutes in the rapid stirring pond, then for 40 minutes in the slow stirring pond, and then the outdoor sedimentation pond. At a flow rate of 0.5 m 3 / Hr (surface load factor: 9.6 m 3 / m 2 .day), and then into a filtration pond.
沈殿池は水面を遮光しないものと、本発明に則り水面
を遮光したものを使用した。The sedimentation basin used was one that did not shade the water surface, and one that shielded the water surface according to the present invention.
12日経過後、沈殿池の排泥を行ない、池内を強撹拌し
て生成した水のクロロフィルａを測定した所、遮光しな
い沈殿池のクロロフィルａは32.8μg/立であるのに対
し、遮光した沈殿池のクロロフィルａは5.5μg/立であ
った。After the elapse of 12 days, the sedimentation basin was drained, and the chlorophyll a of the water generated by vigorously stirring the pond was measured. Chlorophyll a in the pond was 5.5 μg / litre.
このクロロフィルａは水中に存在する藻類の指標で、
水面を本発明に則り遮光した場合は、遮光しない場合に
較べて遥かに生成量が少ないということは沈殿池に藻類
が発生しないこと、結果として藻類に起因して、塩素処
理によるトリハロメタンの生成量も低下することを意味
する。This chlorophyll a is an indicator of algae existing in water,
When the water surface is shielded from light according to the present invention, the generation amount is much smaller than when the water surface is not shielded, which means that no algae are generated in the sedimentation ponds. Also means lowering.
〈発明の効果〉 このように本発明は浄水場にある上水処理用の屋外沈
殿池の水面を、該水面に浮かべたシート状、もしくは板
状の遮光性の浮体で遮光するという簡便、且つ低コスト
の方策で藻類の発生を有効に防止でき、その結果、藻類
に起因する有機物と、水中の遊離塩素との反応を無くし
てトリハロメタンの生成が防止できる。従って、前塩素
処理法であっても過剰に次亜塩素酸ソーダを注入する必
要がなくなり、低コストで殺菌が行なえる。<Effects of the Invention> As described above, the present invention provides a simple and light-shielding floating body having a sheet-like or plate-like shape that floats on the water surface of an outdoor sedimentation basin for water treatment in a water purification plant. The generation of algae can be effectively prevented by a low-cost measure, and as a result, the reaction between organic matter caused by the algae and free chlorine in water can be eliminated, thereby preventing the generation of trihalomethane. Therefore, even in the pre-chlorination method, there is no need to excessively inject sodium hypochlorite, and sterilization can be performed at low cost.
又、虫等の異物が沈殿池の水に入るのも、水面に浮か
んだシート状、もしくは板状の浮体で防止することがで
きる。更に、浮体はシート状、もしくは板状であるた
め、着脱が容易で、保管する場合に場所をとらないとの
利点がある。In addition, entry of foreign substances such as insects into the water of the sedimentation basin can be prevented by a sheet-like or plate-like floating body floating on the water surface. Furthermore, since the floating body has a sheet shape or a plate shape, there is an advantage that it can be easily attached and detached and does not take up space when storing.
第１図は上水処理工程のフローチャート、第２図は板状
の遮光性浮体の一実施例を示す平面図、第３図は第２図
の浮体を隣接状に連結した状態を示す説明図である。 図中、４は屋外沈殿池、８は遮光性浮体を示す。FIG. 1 is a flowchart of a water treatment process, FIG. 2 is a plan view showing an embodiment of a plate-like light-shielding floating body, and FIG. 3 is an explanatory view showing a state in which the floating bodies of FIG. It is. In the figure, 4 indicates an outdoor sedimentation basin, and 8 indicates a light-shielding floating body.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B01D 21/00 - 21/34 C02F 1/00,1/50 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B01D 21/00-21/34 C02F 1 / 00,1 / 50
Claims (1)
れる浄水場の沈殿池の水の水面にシート状、もしくは板
状の遮光性浮体を浮かべることを特徴とする浄水場の沈
殿池での藻類発生防止方法。1. A sediment in a water purification plant, wherein a sheet-shaped or plate-shaped light-shielding floating body floats on the water surface of a sedimentation pond of a water purification plant into which chlorine-containing water is introduced and irradiated with the sun. How to prevent algae from forming in ponds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15676889A JP2964486B2 (en) | 1989-06-21 | 1989-06-21 | Prevention method of algae generation in sedimentation basin of water purification plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15676889A JP2964486B2 (en) | 1989-06-21 | 1989-06-21 | Prevention method of algae generation in sedimentation basin of water purification plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0326306A JPH0326306A (en) | 1991-02-04 |
| JP2964486B2 true JP2964486B2 (en) | 1999-10-18 |
Family
ID=15634890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15676889A Expired - Fee Related JP2964486B2 (en) | 1989-06-21 | 1989-06-21 | Prevention method of algae generation in sedimentation basin of water purification plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964486B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4856801B2 (en) * | 1999-03-16 | 2012-01-18 | 株式会社ベリタス | Method for reducing or suppressing the growth of algae in eutrophied lakes and the like, and apparatus therefor |
| CN116212461A (en) * | 2023-04-17 | 2023-06-06 | 郑州江宇水务工程有限公司 | Device for preventing inclined plate from aging |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117506Y2 (en) * | 1971-05-12 | 1976-05-11 | ||
| JPS6382405U (en) * | 1986-11-14 | 1988-05-30 |
-
1989
- 1989-06-21 JP JP15676889A patent/JP2964486B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0326306A (en) | 1991-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |