JP2014104410A5

JP2014104410A5 -

Info

Publication number: JP2014104410A5
Application number: JP2012258573A
Authority: JP
Filing date: 2012-11-27
Publication date: 2015-08-27
Anticipated expiration: 2032-11-27

Description

また、本発明は、アンモニア含有排水をｐＨ１０以上でアンモニアストリッピング処理するアンモニアストリッピング処理工程と、前記アンモニアストリッピング処理したアンモニアストリッピング処理水をｐＨ１０以上で１段目の逆浸透膜処理を行い、１次透過水と１次濃縮水とに分離する１次逆浸透膜処理工程と、前記１次透過水をｐＨ８．５以下で２段目の逆浸透膜処理を行い、２次透過水と２次濃縮水とに分離する２次逆浸透膜処理工程と、前記２次濃縮水を前記アンモニアストリッピング処理工程の前段側に循環する循環工程と、を含むアンモニア含有排水の処理方法である。 The present invention also provides an ammonia stripping treatment step of ammonia-stripping wastewater containing ammonia at a pH of 10 or higher, and a first-stage reverse osmosis membrane treatment of the ammonia stripping water subjected to the ammonia stripping treatment at a pH of 10 or higher. A primary reverse osmosis membrane treatment step for separating the primary permeate and primary concentrated water, and a second-stage reverse osmosis membrane treatment at a pH of 8.5 or less for the primary permeate, A method for treating ammonia-containing wastewater, comprising: a secondary reverse osmosis membrane treatment step that separates into secondary concentrated water; and a circulation step that circulates the secondary concentrated water upstream of the ammonia stripping treatment step .

Claims

Ammonia stripping treatment means for ammonia-stripping wastewater containing ammonia at a pH of 10 or more;
A primary reverse osmosis membrane treatment means for subjecting the ammonia stripping treated water to a first-stage reverse osmosis membrane treatment at a pH of 10 or more and separating it into primary permeate and primary concentrated water;
A secondary reverse osmosis membrane treatment means for performing a second-stage reverse osmosis membrane treatment of the primary permeable water at a pH of 8.5 or less and separating the primary permeable water into secondary permeable water and secondary concentrated water;
A circulation means for circulating the secondary concentrated water to the upstream side of the ammonia stripping treatment means;
An ammonia-containing wastewater treatment apparatus, comprising:

The ammonia-containing wastewater treatment apparatus according to claim 1,
The ammonia-containing wastewater further contains hydrogen peroxide,
A hydrogen peroxide decomposition means for decomposing hydrogen peroxide in the ammonia-containing waste water is provided on the upstream side of the ammonia stripping treatment means,
The apparatus for treating ammonia-containing wastewater, wherein the circulation means circulates the secondary concentrated water to the hydrogen peroxide decomposition means or to the upstream side of the hydrogen peroxide decomposition means.

An apparatus for treating ammonia-containing wastewater according to claim 2,
The ammonia-containing wastewater treatment apparatus, wherein the hydrogen peroxide decomposition means decomposes hydrogen peroxide by an enzyme treatment using catalase.

An ammonia stripping treatment step of ammonia-containing wastewater at a pH of 10 or higher;
A primary reverse osmosis membrane treatment step in which the ammonia stripping treatment water subjected to the ammonia stripping treatment is subjected to a first-stage reverse osmosis membrane treatment at a pH of 10 or more and separated into a primary permeate and a primary concentrated water;
A secondary reverse osmosis membrane treatment step in which the primary permeate is subjected to a second-stage reverse osmosis membrane treatment at a pH of 8.5 or less and separated into secondary permeate and secondary concentrated water;
A circulation step of circulating the secondary concentrated water to the upstream side of the ammonia stripping treatment step ;
A method for treating ammonia-containing wastewater, comprising:

A method for treating ammonia-containing wastewater according to claim 4,
The ammonia-containing wastewater further contains hydrogen peroxide,
A hydrogen peroxide decomposition step for decomposing hydrogen peroxide in the ammonia-containing wastewater on the front side of the ammonia stripping treatment step;
In the circulation step, the secondary concentrated water is circulated to the hydrogen peroxide decomposition step or the upstream side of the hydrogen peroxide decomposition step.

A method for treating ammonia-containing wastewater according to claim 5,
A method for treating ammonia-containing wastewater, wherein in the hydrogen peroxide decomposition step, hydrogen peroxide is decomposed by an enzyme treatment using catalase.