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A method for advanced treatment and reuse of biochemical effluent from urban domestic sewage

A technology for urban domestic sewage and advanced treatment, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problem that dissolved organic matter is difficult to effectively remove cost, and achieve disinfection effect. Continuous and stable, prolong electrode life, reduce the effect of regeneration frequency

Active Publication Date: 2016-04-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the dissolved organic matter in the secondary effluent of urban domestic sewage is difficult to be effectively removed by a single advanced treatment process and the cost is high, the present invention provides an advanced treatment process for urban domestic sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Secondary biochemical effluent indicators of a 150,000-ton sewage treatment plant: COD≈60-80mg / L, chromaticity≈55-60 degrees (platinum-cobalt colorimetry), NH 3 -N≈15-20mg / L, Cl - ≈50-60mg / L.

[0032] The advanced treatment and reuse method of biochemical effluent of urban domestic sewage of the present invention is used to treat the above-mentioned sewage, and the steps are as follows:

[0033] (1) Contact reaction with magnetic acrylic acid series strongly basic anion exchange resin (developed by Nanjing University, the performance and preparation method of the resin can be found in the content of patent application 201010017687.1) in the upflow pneumatic stirring advanced treatment reactor. The advanced treatment reactor can Realize liquid-solid mixing, the water flow rate is 100 times, and the hydraulic retention time is 60 minutes;

[0034] (2) Resin and water are carried out solid-liquid separation, and the effluent after separation is passed into electrocatalyt...

Embodiment 2

[0038] Secondary biochemical effluent indicators of a 50,000-ton sewage treatment plant: COD≈60-70mg / L, chromaticity≈50-55 degrees (platinum-cobalt colorimetry), NH 3 -N≈10-12mg / L, Cl - ≈45-50mg / L.

[0039] The advanced treatment and reuse method of biochemical effluent of urban domestic sewage of the present invention is used to treat the above-mentioned sewage, and the steps are as follows:

[0040] (1) Contact reaction with magnetic acrylic acid series strongly basic anion exchange resin (developed by Nanjing University, the performance and preparation method of which can be found in patent application 201010017687.1) in a steel mechanically stirred advanced treatment reactor, and the water flow rate is 1000 times, Hydraulic retention time 10min;

[0041](2) Carry out solid-liquid separation of resin and water to the effluent in step (1), the effluent after separation is passed into the electrocatalytic oxidation reactor, and 90% of the separated resin is returned to the ...

Embodiment 3

[0045] Secondary biochemical effluent indicators of a 300,000-ton sewage treatment plant: COD≈40-50mg / L, chromaticity≈55-60 degrees (platinum-cobalt colorimetry), NH 3 -N≈15-20mg / L, Cl - ≈180-200mg / L.

[0046] The advanced treatment and reuse method of biochemical effluent of urban domestic sewage of the present invention is used to treat the above-mentioned sewage, and the steps are as follows:

[0047] (1) Contact reaction with magnetic acrylic strong basic anion exchange resin (developed by Nanjing University, the performance and preparation method of the resin can be found in the content of patent application 201010017687.1) in the hydraulic stirring advanced treatment reactor, the water flow rate is 3000 times, and the hydraulic retention Time 15min;

[0048] (2) Carry out solid-liquid separation to the effluent in step (1), the effluent after the separation is passed into the electrocatalytic oxidation reactor, 90% of the separated resin is returned to the advanced tre...

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PUM

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Abstract

The invention discloses a deep treatment and recycling method of biochemically treated municipal wastewater, belonging to the field of deep treatment of municipal wastewater. The method comprises the following steps: (1) performing contact reaction on municipal wastewater subjected to two-stage biochemical treatment in a wastewater treatment plant and magnetic anion exchange resin in a deep treatment reactor; (2) performing solid-liquid separation on outlet water, feeding the outlet water subjected to the solid-liquid separation into an electrocatalytic oxidation reactor, enabling part of separated resin to flow back to the deep treatment reactor, feeding the rest resin into a regeneration pond for regeneration, performing membrane treatment or electrochemical treatment on an invalid regeneration liquid for preparing a regenerating agent, and feeding regenerated resin back to the deep treatment reactor; and (3) performing electrocatalytic oxidation treatment on outlet water of the deep treatment reactor in the electrocatalytic oxidation reactor, and directly discharging or recycling the treated outlet water. Due to combined application of the magnetic anion exchange resin and electrocatalytic oxidation, dissolved organic matters in water can be efficiently removed and the salt content of the outlet water can be reduced.

Description

technical field [0001] The invention belongs to the field of advanced treatment of urban domestic sewage, and specifically relates to a biochemical tail water advanced treatment method centered on magnetic resin ion exchange and electrocatalytic oxidation. Background technique [0002] my country is a country with scarce water resources, and the per capita water resource is only 2240 cubic meters, which is about 1 / 4 of the world average level. On the other hand, urban domestic sewage is one of the important sources of water pollution in my country. According to statistics, the total discharge of sewage in my country in 2003 reached 46 billion cubic meters, and urban domestic sewage accounted for 53.8% of it. The advanced treatment and reuse of urban domestic sewage can not only reduce the potential secondary pollution, but also alleviate the shortage of water resources in my country. It is an effective way to realize circular economy and develop ecological civilization. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/42
Inventor 李爱民王柏俊王骏双陈冬王长明宋海欧陈讯
Owner NANJING UNIV