JP3410885B2 - Sludge volume reduction method and volume reduction device - Google Patents
Sludge volume reduction method and volume reduction deviceInfo
- Publication number
- JP3410885B2 JP3410885B2 JP31226395A JP31226395A JP3410885B2 JP 3410885 B2 JP3410885 B2 JP 3410885B2 JP 31226395 A JP31226395 A JP 31226395A JP 31226395 A JP31226395 A JP 31226395A JP 3410885 B2 JP3410885 B2 JP 3410885B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- alkaline
- volume reduction
- diaphragm
- treatment tank
- 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
- 239000010802 sludge Substances 0.000 title claims description 98
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 title claims description 17
- 238000011282 treatment Methods 0.000 claims description 83
- 238000000034 method Methods 0.000 claims description 45
- 238000005868 electrolysis reaction Methods 0.000 claims description 20
- 239000003513 alkali Substances 0.000 claims description 17
- 230000007928 solubilization Effects 0.000 claims description 7
- 238000005063 solubilization Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000007743 anodising Methods 0.000 claims 1
- 239000010865 sewage Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000003381 solubilizing effect Effects 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、有機性汚水の生物
処理にともなって発生する生物汚泥などの汚泥の処理方
法、特に食品工場の排水の排水処理工程で発生した余剰
汚泥を減容化する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sludge such as biological sludge produced by biological treatment of organic sewage, and particularly, to reduce the volume of excess sludge produced in the wastewater treatment process of wastewater of food factories. It is about the method.
【０００２】[0002]
【従来の技術】有機性汚水を生物処理する方法として
は、好気性の生物処理である活性汚泥法および嫌気性の
生物処理である生物学的硝化脱窒素法などの生物処理方
法等が行われているが、これら生物処理では処理にとも
なって余剰汚泥が発生する。それらの余剰汚泥の発生量
は除去ＢＯＤ量の３０〜４０％に達する程多い。2. Description of the Related Art As a method for biologically treating organic sewage, there have been used biological treatment methods such as an activated sludge method which is an aerobic biological treatment and a biological nitrification denitrification method which is an anaerobic biological treatment. However, in these biological treatments, excess sludge is generated during the treatment. The amount of excess sludge generated is large enough to reach 30 to 40% of the removed BOD amount.
【０００３】従来、有機性汚泥は有機高分子ポリマーな
どの脱水助剤を添加し、脱水機で脱水された後、焼却処
分されているが、汚泥が大量の場合には、脱水機及び焼
却炉が大規模なものになり、設備費、維持管理費などが
多大の額となり、経済的にも困難となる。従って有機性
汚水を生物処理する場合にはこの有機性汚泥の処理処分
が最大の問題となる。Conventionally, organic sludge has been dehydrated by a dehydrator after adding a dehydrating aid such as an organic polymer, and then incinerated. However, when a large amount of sludge is used, the dehydrator and incinerator are used. Will be large-scale, and the equipment cost, maintenance cost, etc. will be enormous, and it will be economically difficult. Therefore, the treatment and disposal of this organic sludge is the biggest problem when biologically treating organic sewage.
【０００４】この問題を解決する手段の１つとして、有
機性汚泥の減容化があり、それには種々の手段が提案さ
れており、従来よりその手段の１つである生物学的な汚
泥減容化方法として嫌気性消化法、好気性消化法が知ら
れているが、それらは長時間の滞留時間を必要とする割
りには効率が劣り、また難脱水性汚泥を生ずる等の問題
があり、最近はほとんど採用されていないのが実情であ
る。また、生物学的な汚泥減量化方法として加熱下で好
気性消化をする方法（特開昭５５−３４１７５号）も知
られているが、加熱費が高額であり、経済的な面などか
ら実用性が乏しいなどの欠点がある。As one of the means for solving this problem, there is volume reduction of organic sludge, and various means have been proposed for it, and biological sludge reduction which is one of the means has been proposed. Anaerobic digestion method and aerobic digestion method are known as the capacitating methods, but they are inefficient in that they require a long residence time, and there are problems such as generation of hardly dehydratable sludge. The fact is that it has not been adopted recently. A method of aerobic digestion under heating is also known as a biological sludge reduction method (JP-A-55-34175), but the heating cost is high and it is practically used from the economical aspect. There are drawbacks such as poor sex.
【０００５】余剰汚泥を減容化方法の一つに、アルカリ
処理が挙げられる。従来のアルカリ処理法では、アルカ
リ剤の添加によって汚泥をアルカリ性に調整し、可溶化
処理を行う。そして、処理後の汚泥を酸を用いてそのｐ
Ｈを中性付近まで戻すものである。One of the methods for reducing the volume of excess sludge is alkali treatment. In the conventional alkaline treatment method, sludge is adjusted to be alkaline by adding an alkali agent and solubilized. Then, the sludge after the treatment is treated with an acid so that the p
It returns H to near neutral.
【０００６】[0006]
【発明が解決しようとする課題】汚泥のアルカリ処理に
おいて、ｐＨ調整に薬剤は不可欠であり、劇物である
酸、アルカリ剤を用いる必要があった。また、可溶化の
結果、汚泥上澄み液のＴＯＣが高くなり、後段の生物処
理槽への負荷増を招く結果となるという問題があった。In the alkaline treatment of sludge, chemicals are indispensable for pH adjustment, and it is necessary to use acid and alkaline agents which are deleterious substances. Further, as a result of the solubilization, there is a problem that the TOC of the sludge supernatant liquid becomes high, resulting in an increase in load on the biological treatment tank in the subsequent stage.
【０００７】[0007]
【課題を解決するための手段】本発明の上記課題は、以
下に述べる本発明の汚泥の減容化方法および減容化装置
の提供によって解決される。すなわち、（１）生物処理
工程から発生した余剰汚泥を可溶化工程において可溶化
処理し、処理した汚泥を再び生物処理工程に返送するこ
とによって、汚泥を減容化する処理方法において、前記
可溶化工程はアルカリ処理工程と隔膜電解工程からな
り、前記アルカリ処理工程から汚泥を電解工程の陰極処
理工程に循環することにより、アルカリ剤を添加するこ
となく被処理汚泥のｐＨをアルカリ性に維持することを
特徴とする汚泥の減容化方法、好ましくは（２）前記ア
ルカリ処理工程から溢流した汚泥を、前記隔膜電解工程
の陽極処理工程に通して処理汚泥とすることを特徴とす
る前記（１）に記載の汚泥の減容化方法の提供であり、The above-mentioned problems of the present invention are solved by providing a sludge volume-reducing method and a volume-reducing apparatus according to the present invention described below. That is, (1) in the treatment method of reducing the volume of sludge by solubilizing the excess sludge generated from the biological treatment step in the solubilization step and returning the treated sludge to the biological treatment step again. The process consists of an alkali treatment process and a diaphragm electrolysis process, and by circulating sludge from the alkali treatment process to the cathodic treatment process of the electrolysis process, it is possible to maintain the pH of the sludge to be treated alkaline without adding an alkaline agent. A characteristic sludge volume reduction method, preferably (2) the sludge overflowing from the alkali treatment step is passed through an anodic treatment step of the diaphragm electrolysis step to be treated sludge. The provision of the sludge volume reduction method described in
【０００８】また、（３）生物処理工程から発生した余
剰汚泥をアルカリ条件下で滞留させるアルカリ処理槽と
隔膜電解装置を有し、少なくとも前記アルカリ処理槽と
隔膜電解装置の陰極室を連通・循環させたことを特徴と
する汚泥の減容化装置、好ましくは（４）生物処理工程
から発生した余剰汚泥をアルカリ条件下で滞留させる第
１のアルカリ処理槽と前記第１のアルカリ処理槽より溢
流した汚泥を滞留させる第２のアルカリ処理槽と隔膜電
解装置を有し、第１のアルカリ処理槽と前記隔膜電解装
置の陰極室を連通・循環させると共に、第２のアルカリ
処理槽と前記隔膜電解装置の陽極室を連通させ、前記陽
極室に処理汚泥の排出口を配備してなることを特徴とす
る汚泥の減容化装置の提供である。Further, (3) an alkaline treatment tank for retaining excess sludge generated from the biological treatment process under alkaline conditions and a diaphragm electrolysis device are provided, and at least the alkaline treatment tank and the cathode chamber of the diaphragm electrolysis device are connected and circulated. A sludge volume reducing device, preferably (4) a first alkali treatment tank for retaining excess sludge generated from a biological treatment process under alkaline conditions and an overflow from the first alkali treatment tank A second alkaline treatment tank for retaining the sludge that has flown and a diaphragm electrolysis device are provided, and the first alkaline treatment tank and the cathode chamber of the diaphragm electrolysis device are communicated and circulated, and the second alkaline treatment tank and the diaphragm are also provided. It is an object of the present invention to provide a sludge volume-reducing device, which is characterized in that an anode chamber of an electrolyzer is communicated with a treated sludge discharge port.
【０００９】本発明の汚泥減容化方法の骨子は、アルカ
リ剤を添加することなく被処理汚泥のｐＨをアルカリ性
に維持することを可能にし、酸を添加することなく被処
理汚泥のｐＨを中性に戻すことを可能にする汚泥の減容
化方法の提供であり、また、本発明汚泥の減容化装置の
骨子は、前記汚泥の減容化方法を実現可能にする隔膜電
解装置を配備した減容化装置の提供にある。The essence of the sludge volume reduction method of the present invention makes it possible to maintain the pH of the sludge to be treated alkaline without adding an alkaline agent, and to adjust the pH of the sludge to be treated without adding an acid. The present invention is to provide a method for reducing the volume of sludge that enables the sludge to be restored to its originality, and the essence of the apparatus for reducing the volume of sludge of the present invention is to install a diaphragm electrolysis device that enables the method for reducing the volume of sludge. The provision of the volume reduction device.
【００１０】またここで、前記アルカリ処理工程から溢
流した汚泥などという記載があるが、本発明は、工程や
槽の間の移送が溢流であるかポンプによる移送であるか
など移送の手段によって制限されるものではない。Although there is a description of sludge overflowing from the alkali treatment step, the present invention is a means of transferring whether the transfer between steps or tanks is overflow or pump. Is not limited by.
【００１１】[0011]
【発明の実施の形態】本発明の有機性汚水の減容化装置
の１具体例の構造を図１に示し、図１を用いて以下に本
発明の減容化装置および減容化方法について説明する。BEST MODE FOR CARRYING OUT THE INVENTION The structure of one embodiment of the volume reduction apparatus for organic wastewater of the present invention is shown in FIG. 1, and the volume reduction apparatus and volume reduction method of the present invention are described below with reference to FIG. explain.
【００１２】本発明の減容化装置は隔膜電解装置１、第
１のアルカリ処理槽２及び第２のアルカリ処理槽３より
なる。図１において、先ず、隔膜電解装置１の構造の例
について説明する。隔膜電解装置１の電解槽は中央で隔
膜８により陰極室６と陽極室７に区切られ、陰極室６内
に陰極４が陽極室７内に陽極５が設けられている。陰極
４および陽極５は直流電源９に接続されている。通常陰
極４と陽極５は共に白金メッキのチタン電極よりなる。
また、隔膜８には通常有機性精密ろ過膜（ＭＦ膜とよば
れる。）が使用される。The volume reducing apparatus of the present invention comprises a diaphragm electrolyzer 1, a first alkaline treatment tank 2 and a second alkaline treatment tank 3. In FIG. 1, first, an example of the structure of the diaphragm electrolysis device 1 will be described. The electrolytic cell of the diaphragm electrolysis device 1 is divided into a cathode chamber 6 and an anode chamber 7 by a diaphragm 8 at the center, and a cathode 4 is provided in the cathode chamber 6 and an anode 5 is provided in the anode chamber 7. The cathode 4 and the anode 5 are connected to a DC power supply 9. Usually, both the cathode 4 and the anode 5 are platinum-plated titanium electrodes.
An organic microfiltration membrane (called an MF membrane) is usually used for the diaphragm 8.
【００１３】次に、前記隔膜電解装置１を配備した本発
明の減容化装置の構造の例について説明する。生物処理
工程から発生した余剰汚泥は、先ず第１のアルカリ処理
槽２に供給されここで所定時間滞留する。第１のアルカ
リ処理槽２内の余剰汚泥の一部は隔膜電解装置１の陰極
室６にポンプにより移送し、他の一部は第２のアルカリ
処理槽３へ溢流する。隔膜電解装置１の陰極室６に移送
した汚泥は陰極室６においてアルカリ性に維持されるこ
とにより可溶化処理を受けた後陰極室６上部から溢流し
て第１のアルカリ処理槽２に還流する。このように余剰
汚泥の一部は第１のアルカリ処理槽２と陰極室６の間を
循環し、第１のアルカリ処理槽２内のｐＨ値はアルカリ
処理に適する所定の値に維持される。Next, an example of the structure of the volume reducing device of the present invention in which the diaphragm electrolysis device 1 is provided will be described. Excess sludge generated from the biological treatment process is first supplied to the first alkaline treatment tank 2 and stays there for a predetermined time. A part of the excess sludge in the first alkaline treatment tank 2 is transferred to the cathode chamber 6 of the diaphragm electrolyzer 1 by a pump, and the other part overflows to the second alkaline treatment tank 3. The sludge transferred to the cathode chamber 6 of the diaphragm electrolysis apparatus 1 is solubilized by being kept alkaline in the cathode chamber 6 and then overflows from the upper portion of the cathode chamber 6 and flows back to the first alkaline treatment tank 2. Thus, a part of the excess sludge circulates between the first alkaline treatment tank 2 and the cathode chamber 6, and the pH value in the first alkaline treatment tank 2 is maintained at a predetermined value suitable for the alkaline treatment.
【００１４】一方第２のアルカリ処理槽３へ溢流した汚
泥はポンプにより隔膜電解装置１の陽極室７に移送す
る。第２のアルカリ処理槽３では、汚泥の可溶化はすす
み、汚泥のｐＨ値は低下するが、汚泥のｐＨ値を調整す
ることは行われない。しかし第２のアルカリ処理槽３に
滞留する時間の調整によって、ｐＨ値が９以上を維持し
ている間に陽極室７に移送される。陽極室７に移送した
汚泥は弱酸性に変化し、電解酸化処理を受けた後処理汚
泥として系外に流出する。On the other hand, the sludge overflowing into the second alkaline treatment tank 3 is transferred to the anode chamber 7 of the diaphragm electrolyzer 1 by a pump. In the second alkaline treatment tank 3, the sludge is solubilized and the pH value of the sludge is lowered, but the pH value of the sludge is not adjusted. However, it is transferred to the anode chamber 7 while the pH value is maintained at 9 or more by adjusting the time of staying in the second alkaline treatment tank 3. The sludge transferred to the anode chamber 7 changes to weak acidity, and after being subjected to electrolytic oxidation treatment, flows out of the system as post-treatment sludge.
【００１５】隔膜電解装置１の陰極室６では次の式で表
される電解反応により汚泥はアルカリ性に維持されるこ
とにより可溶化処理を受ける。すなわち、陰極４を備え
た陰極室６では、
Ｈ2 Ｏ＋ｅ- →１／２Ｈ2 ＋ＯＨ-
の反応が起こる。この結果、陰極室８では汚泥がアルカ
リによって可溶化する。In the cathode chamber 6 of the diaphragm electrolyzer 1, sludge is solubilized by being kept alkaline by an electrolytic reaction represented by the following formula. That is, in the cathode chamber 6 provided with the cathode 4, the reaction of H 2 O + e − → 1 / 2H 2 + OH − occurs. As a result, the sludge is solubilized by the alkali in the cathode chamber 8.
【００１６】一方、陰極５を備えた陽極室７で起きる電
解は次の反応式で表される。
Ｈ2 Ｏ →１／２Ｏ2 ＋２Ｈ+ ＋２ｅ-
この式から理解されるように、陽極室７では水素イオン
が生成し、ｐＨが弱酸性に低下する。陽極室７では、ア
ルカリ可溶化にともなって生成した、難生物分解性有機
物を含む、溶解性であり、コロイド状のＣＯＤ成分が電
解酸化により除去される。On the other hand, electrolysis occurring in the anode chamber 7 equipped with the cathode 5 is represented by the following reaction formula. H 2 O → 1 / 2O 2 + 2H + + 2e − As can be understood from this formula, hydrogen ions are generated in the anode chamber 7, and the pH is weakly acidic. In the anode chamber 7, a soluble, colloidal COD component containing a hardly biodegradable organic substance generated by the alkali solubilization is removed by electrolytic oxidation.
【００１７】さらに、本発明の有機性汚泥の減容化処理
法及び減容化処理装置が適用される生物処理全体の１具
体例を図２に示し、図２を用いて以下に生物処理全体の
中でにおける本発明の減容化装置および減容化方法の作
用について説明する。例示する生物処理としては、標準
的な活性汚泥法であるとして説明する。Further, one specific example of the whole biological treatment to which the method for reducing volume of organic sludge and the apparatus for reducing volume of the present invention is applied is shown in FIG. 2, and the whole biological treatment will be described below with reference to FIG. The operation of the volume reducing device and the volume reducing method of the present invention will be described below. The exemplified biological treatment will be described as a standard activated sludge method.
【００１８】図２において、活性汚泥法の生物処理槽１
１に下水などの有機性汚水を原水として供給し生物処理
する。前記生物処理槽１１からの生物処理水を沈殿池１
２に送水して固液分離する。固液分離した得られた処理
水１３は系外に排出する。一方分離汚泥１４の一部は返
送汚泥１５として生物処理槽１１に返送し、前記分離汚
泥の他部および／または生物処理工程から引き抜いた汚
泥は、移送汚泥１６として本発明の１例の前記した汚泥
減容化装置の第１のアルカリ処理槽２に移送する。本発
明の１例の汚泥減容化装置の構造及び作用については既
に前記した通りである。前記陽極室７に移送された可溶
化汚泥は処理汚泥１７として生物処理槽１１に還流さ
れ、ここで還流汚泥（処理汚泥１７である。）は生物学
的に炭酸ガス、水に分解する。In FIG. 2, the biological treatment tank 1 of the activated sludge method is used.
1) Organic wastewater such as sewage is supplied as raw water for biological treatment. The biological treatment water from the biological treatment tank 11 is settling tank 1
Water is sent to 2 for solid-liquid separation. The treated water 13 obtained by solid-liquid separation is discharged out of the system. On the other hand, a part of the separated sludge 14 is returned to the biological treatment tank 11 as a return sludge 15, and the sludge extracted from the other part of the separated sludge and / or the biological treatment step is used as the transfer sludge 16 in the above-described one example of the present invention. It is transferred to the first alkali treatment tank 2 of the sludge volume reducing device. The structure and operation of the sludge volume reducing apparatus of one example of the present invention are as described above. The solubilized sludge transferred to the anode chamber 7 is returned to the biological treatment tank 11 as treated sludge 17, where the refluxed sludge (the treated sludge 17) is biologically decomposed into carbon dioxide gas and water.
【００１９】以上説明した本発明の汚泥減容化方法によ
る生物処理による処理水３のＣＯＤ濃度の悪化は起こら
ないThe COD concentration of the treated water 3 does not deteriorate due to the biological treatment by the sludge volume reduction method of the present invention described above.
【００２０】本発明において、生物処理槽１１内に常に
所定の微生物濃度（ＭＬＳＳ濃度）が維持されているよ
うに還流汚泥（処理汚泥１７）の量を制御することが、
生物処理を最も効率よいものとする。この還流汚泥の量
の制御はまた、次工程の汚泥減量化手段である隔膜電解
処理の負荷を最も少なくするのに役立つ。生物処理槽内
のＭＬＳＳの濃度範囲を前記の値に維持することは生物
処理槽内にＭＬＳＳ自動測定器を設置することで容易に
行うことができる。In the present invention, it is possible to control the amount of reflux sludge (treated sludge 17) so that a predetermined microorganism concentration (MLSS concentration) is always maintained in the biological treatment tank 11.
Make biological treatment most efficient. The control of the amount of the recirculated sludge also serves to minimize the load of the diaphragm electrolysis treatment which is the sludge reduction means in the next step. Maintaining the concentration range of MLSS in the biological treatment tank at the above value can be easily performed by installing an MLSS automatic measuring device in the biological treatment tank.
【００２１】[0021]
【実施例】以下の実施例では、本発明における１具体例
における数値につき説明するが、その他に下水処理場な
どで発生する余剰汚泥を可溶化処理し、減容化を図る場
合にも同様に実施適用でき、従って本発明は以下の実施
例によって制限されないことはいうまでもない。[Examples] In the following examples, numerical values in one specific example of the present invention will be described, but the same applies to the case of solubilizing excess sludge generated in a sewage treatment plant or the like to reduce the volume. It is needless to say that the present invention can be applied to practice, and thus the present invention is not limited by the following examples.
【００２２】実施例１及び比較例１図１の工程に従っ
て、有機性汚水を対象として第１表に示した試験条件の
もとに汚泥減容化処理を行ったところ第２表のような結
果が得られた。Example 1 and Comparative Example 1 According to the process shown in FIG. 1, the sludge volume reduction treatment was performed on the organic sewage under the test conditions shown in Table 1, and the results shown in Table 2 were obtained. was gotten.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【表２】 [Table 2]
【００２５】第１表中の第２アルカリ槽のｐＨ値の欄に
無調整とあるのは、既に前記したように第２アルカリ槽
ではｐＨ値の調整を行わないことを意味する。第２表に
示す通り、２８％の可溶化率が得られた。また、実施例
の処理汚泥の上澄み液のＴＯＣは、比較例のＴＯＣに比
べて１０分の１以下の値となった。このことは、隔膜電
解装置の陽極室において有機物が酸化分解されたことを
示すものである。"No adjustment" in the column of pH value of the second alkaline tank in Table 1 means that the pH value is not adjusted in the second alkaline tank as described above. As shown in Table 2, a solubilization rate of 28% was obtained. Further, the TOC of the supernatant of the treated sludge of the example was a value of 1/10 or less as compared with the TOC of the comparative example. This indicates that the organic substances were oxidatively decomposed in the anode chamber of the diaphragm electrolyzer.
【００２６】[0026]
【発明の効果】本発明は、以上説明した通り、次のよう
な効果が得られる。
１．薬剤を使用することなしに、汚泥をアルカリ処理す
ることを可能にした。
２．従来の方法では、可溶化にともない生成されるＴＯ
Ｃ成分を処理することが必要であったが、隔膜電解装置
の陽極室での酸化分解反応によって後処理への負荷を著
しく低減することができた。As described above, the present invention has the following effects. 1. It allowed the sludge to be treated alkaline without the use of chemicals. 2. In the conventional method, TO generated by solubilization
Although it was necessary to treat the C component, it was possible to significantly reduce the load on the post-treatment due to the oxidative decomposition reaction in the anode chamber of the diaphragm electrolyzer.
【００２７】３．処理汚泥のｐＨが中性付近の値に戻っ
ているため、従来の酸による中和が不要となる。3. Since the pH of the treated sludge has returned to a value near neutral, conventional neutralization with acid is not required.
【図１】本発明の減容化装置の１例を示す説明図であ
る。FIG. 1 is an explanatory view showing an example of a volume reducing device of the present invention.
【図２】生物処理設備と本発明の減容化装置とからなる
汚水処理設備の１例を示す説明図である。FIG. 2 is an explanatory diagram showing an example of sewage treatment equipment including a biological treatment equipment and a volume reduction device of the present invention.
１ 隔膜電解装置 ２ 第１アルカリ槽 ３ 第２アルカリ槽 ４ 陰極 ５ 陽極 ６ 陰極室 ７ 陽極室 ８ 隔膜 ９ 直流電源 １１ 生物処理槽 １２ 固液分離手段 １３ 処理水 １４ 分離汚泥 １５ 返送汚泥 １６ 移送汚泥 １７ 処理汚泥 1 Diaphragm electrolysis device 2 First alkaline tank 3 second alkaline tank 4 cathode 5 anode 6 Cathode chamber 7 Anode chamber 8 diaphragm 9 DC power supply 11 biological treatment tank 12 Solid-liquid separation means 13 Treated water 14 Separation sludge 15 Return sludge 16 Transfer sludge 17 Treated sludge
フロントページの続き (56)参考文献 特開 昭64−80499（ＪＰ，Ａ) 特開 平７−185597（ＪＰ，Ａ) 特開 平３−157196（ＪＰ，Ａ) 特開 平４−83596（ＪＰ，Ａ) 特開 昭57−180500（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 11/00 - 11/20 C02F 3/12 Continuation of the front page (56) References JP-A 64-80499 (JP, A) JP-A 7-185597 (JP, A) JP-A 3-157196 (JP, A) JP-A 4-83596 (JP , A) JP 57-180500 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C02F 11/00-11/20 C02F 3/12
Claims (4)
溶化工程において可溶化処理し、処理した汚泥を再び生
物処理工程に返送することによって、汚泥を減容化する
処理方法において、前記可溶化工程はアルカリ処理工程
と隔膜電解工程からなり、前記アルカリ処理工程から汚
泥を電解工程の陰極処理工程に循環することにより、ア
ルカリ剤を添加することなく被処理汚泥のｐＨをアルカ
リ性に維持することを特徴とする汚泥の減容化方法。1. A treatment method for reducing the volume of sludge by subjecting surplus sludge generated from a biological treatment process to a solubilization process in the solubilization process and returning the treated sludge to the biological treatment process again. The process consists of an alkali treatment process and a diaphragm electrolysis process, and by circulating sludge from the alkali treatment process to the cathodic treatment process of the electrolysis process, it is possible to maintain the pH of the sludge to be treated alkaline without adding an alkaline agent. Characteristic sludge volume reduction method.
を、前記隔膜電解工程の陽極処理工程に通して処理汚泥
とすることを特徴とする請求項１に記載の汚泥の減容化
方法。2. The sludge volume reduction method according to claim 1, wherein the sludge overflowing from the alkali treatment step is passed through an anodizing step of the diaphragm electrolysis step to be treated sludge.
ルカリ条件下で滞留させるアルカリ処理槽と隔膜電解装
置を有し、少なくとも前記アルカリ処理槽と隔膜電解装
置の陰極室を連通・循環させることを特徴とする汚泥の
減容化装置。3. An alkaline treatment tank for retaining excess sludge generated from a biological treatment process under alkaline conditions and a diaphragm electrolyzer, wherein at least the alkaline tank and the cathode chamber of the diaphragm electrolyzer are connected and circulated. A characteristic sludge volume reduction device.
ルカリ条件下で滞留させる第１のアルカリ処理槽と前記
第１のアルカリ処理槽より溢流した汚泥を滞留させる第
２のアルカリ処理槽と隔膜電解装置を有し、第１のアル
カリ処理槽と前記隔膜電解装置の陰極室を連通・循環さ
せると共に、第２のアルカリ処理槽と前記隔膜電解装置
の陽極室を連通させ、前記陽極室に処理汚泥の排出口を
配備してなることを特徴とする汚泥の減容化装置。4. A first alkali treatment tank for retaining excess sludge generated from a biological treatment process under alkaline conditions, a second alkali treatment tank for retaining sludge overflowing from the first alkali treatment tank, and a diaphragm. An electrolytic apparatus is provided, and a first alkaline treatment tank and a cathode chamber of the diaphragm electrolysis apparatus are communicated and circulated, and a second alkaline treatment tank and an anode chamber of the diaphragm electrolysis apparatus are communicated with each other to treat the anode chamber. A sludge volume reduction device characterized by being provided with a sludge discharge port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31226395A JP3410885B2 (en) | 1995-11-30 | 1995-11-30 | Sludge volume reduction method and volume reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31226395A JP3410885B2 (en) | 1995-11-30 | 1995-11-30 | Sludge volume reduction method and volume reduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09150196A JPH09150196A (en) | 1997-06-10 |
| JP3410885B2 true JP3410885B2 (en) | 2003-05-26 |
Family
ID=18027142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31226395A Expired - Fee Related JP3410885B2 (en) | 1995-11-30 | 1995-11-30 | Sludge volume reduction method and volume reduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3410885B2 (en) |
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|---|---|---|---|---|
| CN109879378A (en) * | 2019-04-16 | 2019-06-14 | 无锡迅朗联大机能水技术研究院有限公司 | Device and method for preparing neutral electrolyzed water |
| CN114057366A (en) * | 2021-08-24 | 2022-02-18 | 北京工业大学 | Method for assisting sludge treatment by utilizing electrochemical process |
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1995
- 1995-11-30 JP JP31226395A patent/JP3410885B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09150196A (en) | 1997-06-10 |
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