JPS59228993A - High-degree treatment of biological treating water - Google Patents
High-degree treatment of biological treating waterInfo
- Publication number
- JPS59228993A JPS59228993A JP58102452A JP10245283A JPS59228993A JP S59228993 A JPS59228993 A JP S59228993A JP 58102452 A JP58102452 A JP 58102452A JP 10245283 A JP10245283 A JP 10245283A JP S59228993 A JPS59228993 A JP S59228993A
- Authority
- JP
- Japan
- Prior art keywords
- slaked lime
- water
- treating water
- added
- biological treating
- 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.)
- Pending
Links
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、し尿、下水または産業廃水の生物処理水を
さらに高度に処理する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for more advanced treatment of biologically treated water such as human waste, sewage or industrial wastewater.
従来から、生物処理水はアルミニウム塩や鉄塩などの凝
結剤添加による凝集処理が施され、りんの除去やCOD
、色度の低減がはかられている。あるいは、この凝集処
理ののち、さらにCODを低減するために、活性炭によ
る吸着処理が行われている。この吸着処理は運転費用が
高いので、吸着処理にかかる負荷を低減するため前処理
でるる凝集処理に改善が求められている。凝結剤の添加
量を増加して凝集効果を高めようとすると、やは)薬剤
費用が嵩み、また汚泥の発生量が増加するという問題が
おった。Traditionally, biologically treated water has been subjected to flocculation treatment by adding coagulants such as aluminum salts and iron salts to remove phosphorus and reduce COD.
, the chromaticity is reduced. Alternatively, after this coagulation treatment, adsorption treatment using activated carbon is performed to further reduce COD. Since this adsorption treatment is expensive to operate, there is a need for improvements in the pre-treatment flocculation treatment in order to reduce the load placed on the adsorption treatment. If an attempt was made to increase the coagulation effect by increasing the amount of coagulant added, there were problems such as an increase in the cost of the agent and an increase in the amount of sludge generated.
本発明は、薬剤費用、汚泥発生量を増大させることなく
、生物処理水を高度に処理する優れた凝集処理法を提供
することを目的とする。An object of the present invention is to provide an excellent flocculation treatment method for highly treating biologically treated water without increasing the cost of chemicals or the amount of sludge generated.
すなわち、本発明は、生物処理水に消石灰を添加して水
中のリン酸イオンを不溶化したのち、無機凝結剤を添加
して生成したフロックを固液分離することを特徴とする
生物処理水の高度処理法である。That is, the present invention provides an advanced method for biologically treated water characterized by adding slaked lime to the biologically treated water to insolubilize phosphate ions in the water, and then adding an inorganic coagulant to separate the generated flocs into solid and liquid. It is a processing method.
本発明において、生物処理水とは、活性汚泥処理におけ
る曝気槽内の混合液であっても、その混合液中の汚泥を
分離した上表もよい。また、散布炉床法、回転円板法な
ど、汚水を生物学的に処理する方法によって得られる処
理水ならば、本発明の対象となる。In the present invention, the biologically treated water may be a mixed liquid in an aeration tank in activated sludge treatment, or it may be the above-mentioned water obtained by separating sludge from the mixed liquid. Further, treated water obtained by a method of biologically treating wastewater, such as a spray hearth method or a rotating disk method, is also a target of the present invention.
本発明においては、まず生物処理水に消石灰を添加して
、リン酸イオンを不溶化する。リン化合物は、生物処理
により、はとんどが正リン酸に変わるので、生物処理後
の原水に消石灰を添加すると不溶化の効果が大きい。そ
の除、曝気槽に添加すると、硝化による混合液のPH低
下を防止できるとともに、生成したリン酸イオンを不溶
化することができる。消石灰の添加量は、リン酸イオン
の濃度や生物処理水のpH緩衡性にもよるが、目安とし
ては、消石灰をカルシウム換算でリンの1〜3倍程度添
加すればよい。In the present invention, slaked lime is first added to biologically treated water to insolubilize phosphate ions. Most of the phosphorus compounds are converted into orthophosphoric acid through biological treatment, so adding slaked lime to raw water after biological treatment has a large insolubilization effect. In addition, when added to the aeration tank, it is possible to prevent the pH of the mixed solution from decreasing due to nitrification, and to insolubilize the generated phosphate ions. The amount of slaked lime to be added depends on the concentration of phosphate ions and the pH buffering properties of the biologically treated water, but as a guide, slaked lime should be added in an amount of 1 to 3 times the amount of phosphorus in terms of calcium.
pHは7以上、好ましくは9程度がよい。リン酸イオン
を不溶化したのち、これを固液分離するか、またはせず
に、次に無機凝結剤を添加する。The pH is preferably 7 or more, preferably about 9. After insolubilizing the phosphate ions, an inorganic coagulant is then added, either with or without solid-liquid separation.
無機凝結剤は、硫酸アルミニウム、塩化アルミニウム、
ポリ塩化アルミニウム、硫酸第一鉄、硫酸第二鉄、塩化
坑二鉄、ポリ硫酸第二鉄などが使用できる。これらの無
機凝結剤の中では、安価で効果の優れた鉄塩がよい。Inorganic coagulants include aluminum sulfate, aluminum chloride,
Polyaluminum chloride, ferrous sulfate, ferric sulfate, ferric chloride, polyferric sulfate, etc. can be used. Among these inorganic coagulants, iron salts are preferred because they are inexpensive and highly effective.
リン酸イオンを不溶化したのちの生物処理水に無機凝結
剤を添加すると、リン酸イオンを不溶化しない場合に比
らべCODの除去効果がよい。その理由は不明であるが
無機凝結剤は。When an inorganic coagulant is added to biologically treated water after phosphate ions are insolubilized, the COD removal effect is better than when phosphate ions are not insolubilized. The reason is unknown, but inorganic coagulants.
COD、色度の除去よりもリン酸イオンの除去を優先す
るため、あらかじめリン酸イオンを不溶化することによ
り、 Fe”/Pの比が増大すると、COD、色度の除
去に寄与する無機凝結剤の割合が大きくなるものと思わ
れる。In order to give priority to the removal of phosphate ions over the removal of COD and chromaticity, by insolubilizing phosphate ions in advance, when the Fe''/P ratio increases, an inorganic coagulant that contributes to the removal of COD and chromaticity It is expected that the proportion of
凝結剤を添加するときは、リン酸イオンを不溶化した生
物処理水のpHを、その凝結剤の凝結作用に適したpH
に調整する。もしそのpHが酸性であると、不溶化した
リン酸カルシウムが再溶解するおそれがあるので、この
ような場合には、凝結剤を添加する前に、不溶化物を除
去しておくことが必要である。When adding a coagulant, adjust the pH of the biologically treated water with insolubilized phosphate ions to a pH suitable for the coagulating action of the coagulant.
Adjust to. If the pH is acidic, the insolubilized calcium phosphate may be redissolved, so in such a case, it is necessary to remove the insolubilized material before adding the coagulant.
凝結剤を添加して、生成したフロックは、沈殿分離、浮
上分離、遠心分離、濾過分離など。The flocs generated by adding a coagulant can be separated by precipitation, flotation, centrifugation, filtration, etc.
公知の固液分離手段により分離する。その際、ポリアク
リルアミドまたはその部分加水分解物。Separate by known solid-liquid separation means. In this case, polyacrylamide or its partially hydrolyzed product.
ポリアクリル酸ナトリウム等の公知の凝集剤を添加して
、フロックを粗大化すると分離効率がよいので好ましい
。It is preferable to add a known flocculant such as sodium polyacrylate to coarsen the flocs, as separation efficiency is improved.
本発明によると、生物処理水の凝結処理に先実施例2
はぼ無希釈で運転されている、し尿処理場の曝気槽の混
合液の一部を抜き取シ、これに消石灰を2000q/i
添加し10分間攪拌したのち、遠心分離を行い、その上
泄液に塩化第二鉄を添加し凝集処理してCODMflを
除去した。結果を第2表に示す。また、比較のため混合
液に消石灰を添加せずに、遠心分離して得られた上溌液
に塩化第二鉄を添加した場合も併記した。なお、塩化第
二鉄添加後、pHは4,5に調整した。According to the present invention, in the condensation treatment of biologically treated water, a part of the liquid mixture in the aeration tank of a human waste treatment plant, which is operated without dilution, is extracted, and 2000 q/i of slaked lime is added to it.
After adding and stirring for 10 minutes, centrifugation was performed, and ferric chloride was added to the supernatant to perform flocculation treatment to remove CODMfl. The results are shown in Table 2. For comparison, a case where slaked lime was not added to the mixed solution and ferric chloride was added to the supernatant obtained by centrifugation is also shown. In addition, after adding ferric chloride, the pH was adjusted to 4.5.
第 2 表
第2表からも、原水中のリン酸イオンを不溶化して除去
しておけば、不溶化しない場合に比べCODM11除去
効果がよく、Fe01g添加量を低減できることがわか
る。なお、CODMn除去限界値は、320〜330程
度と考えられた。Table 2 It can also be seen from Table 2 that if the phosphate ions in the raw water are insolubilized and removed, the CODM11 removal effect is better than in the case where they are not insolubilized, and the amount of Fe01g added can be reduced. Note that the CODMn removal limit value was considered to be about 320 to 330.
出願人 栗田工業株式会社Applicant: Kurita Industries Co., Ltd.
Claims (1)
溶化したのち、無機凝結剤を添加して生成したフロック
を同液分離することを特徴とする生物処理水の高度処理
法。An advanced treatment method for biologically treated water, which is characterized by adding slaked lime to the biologically treated water to insolubilize phosphate ions in the water, and then adding an inorganic coagulant to separate the generated flocs from the same liquid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58102452A JPS59228993A (en) | 1983-06-08 | 1983-06-08 | High-degree treatment of biological treating water |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58102452A JPS59228993A (en) | 1983-06-08 | 1983-06-08 | High-degree treatment of biological treating water |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59228993A true JPS59228993A (en) | 1984-12-22 |
Family
ID=14327860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58102452A Pending JPS59228993A (en) | 1983-06-08 | 1983-06-08 | High-degree treatment of biological treating water |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59228993A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6480498A (en) * | 1987-09-21 | 1989-03-27 | Ebara Infilco | Treatment of organic sewage |
JP2005007257A (en) * | 2003-06-18 | 2005-01-13 | Ataka Construction & Engineering Co Ltd | Phosphorus recovering apparatus and method for treating phosphorus-containing organic wastewater |
JP2012035183A (en) * | 2010-08-05 | 2012-02-23 | Ishii Shoji Kk | Method for decoloring and purifying water |
CN105254073A (en) * | 2015-11-05 | 2016-01-20 | 四川新能水处理工程有限公司 | System and implementation method for treating and recycling wastewater from phosphorus chemical industry |
CN110745990A (en) * | 2019-10-29 | 2020-02-04 | 中钢集团郑州金属制品研究院有限公司 | Purification treatment process before recycling of acidic phosphorus-containing wastewater |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4917707A (en) * | 1972-06-07 | 1974-02-16 | ||
JPS53107151A (en) * | 1977-03-02 | 1978-09-18 | Ajinomoto Kk | Method of dephosphorizing waste water |
-
1983
- 1983-06-08 JP JP58102452A patent/JPS59228993A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4917707A (en) * | 1972-06-07 | 1974-02-16 | ||
JPS53107151A (en) * | 1977-03-02 | 1978-09-18 | Ajinomoto Kk | Method of dephosphorizing waste water |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6480498A (en) * | 1987-09-21 | 1989-03-27 | Ebara Infilco | Treatment of organic sewage |
JP2005007257A (en) * | 2003-06-18 | 2005-01-13 | Ataka Construction & Engineering Co Ltd | Phosphorus recovering apparatus and method for treating phosphorus-containing organic wastewater |
JP2012035183A (en) * | 2010-08-05 | 2012-02-23 | Ishii Shoji Kk | Method for decoloring and purifying water |
CN105254073A (en) * | 2015-11-05 | 2016-01-20 | 四川新能水处理工程有限公司 | System and implementation method for treating and recycling wastewater from phosphorus chemical industry |
CN110745990A (en) * | 2019-10-29 | 2020-02-04 | 中钢集团郑州金属制品研究院有限公司 | Purification treatment process before recycling of acidic phosphorus-containing wastewater |
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