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High-efficiency low-consumption retexture method for urban sewage

A technology of urban sewage and treatment methods, which is applied in the field of urban sewage treatment and resource utilization, can solve the problems of high cost and price of reclaimed water, restrictions on treatment and resource utilization, high investment and operation costs, and achieve shortening of hydraulic retention time, cost reduction, The effect of saving running costs

Inactive Publication Date: 2008-08-20
BEIJING UNIV OF TECH
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Problems solved by technology

[0007] At present, the production of recycled water in my country still follows the old road of developed countries, that is, on the basis of the secondary effluent of urban sewage plants, the deep phosphorus and nitrogen removal process is combined in series, which leads to the existing process of urban sewage regeneration treatment. Problems such as unreasonable collocation, high investment and operating costs lead to high cost and price of reclaimed water, which makes reclaimed water lose its economic advantage compared with tap water, which is the bottleneck restricting sewage treatment and resource utilization

Method used

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  • High-efficiency low-consumption retexture method for urban sewage

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[0046] The treated urban sewage water quality is as follows: COD=220~500mg / L, BOD 5 =120~220mg / L, SS≤200mg / L, NH 4 + -N=55~85mg / L, NO 2 - -N3 - - N<1.5 mg / L, TP=3.5-8.0 mg / L, pH=7.0-8.5.

[0047] The treated effluent quality is as follows: COD5 4 + -N<5mg / L, the removal rate is over 95%; TN≤15mg / L, the removal rate is over 90%; TP≤0.5mg / L, the removal rate is over 90%; PH=7.5~9.0.

[0048] The specific treatment is as follows:

[0049] 1) Pretreatment: introduce urban sewage into the grille, grit chamber and sedimentation tank, mainly remove larger solid suspended solids in the sewage, and the effluent enters the regulating water tank;

[0050] 2) Biological phosphorus removal: introduce the pretreated urban sewage into the anaerobic / aerobic tank, the volume ratio of the anaerobic section to the aerobic section is 1:2.3, the total hydraulic retention time is 4 to 6 hours, and the sludge is refluxed Ratio 60%~120%, DO<0.5mg / L in the anaerobic section, DO=1.5~2.5mg / L in ...

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Abstract

The invention relates to a high-efficiency and low-consumption recycling and treating method for urban sewage, belonging to the technical field of treating and reusing the urban sewage, which aims to solve the problem of poor effects of dephosphorization and denitrogenation in prior art. The recycling and treating method in the invention is characterized in that: first, biological phosphorus removal is conducted for the pretreated sewage, meanwhile, the organic substance is also removed; then, the biological autotrophic denitrogenation is carried out, thus completing the recycle and treatment of the sewage. The biological autotrophic denitrogenation can be implemented in six ways: first, the sewage with the phosphorus removed biologically enters a nitrous acid biofilter, and then enters an ANAMMOX activated sludge reactor; second, the sewage enters a nitrous acid activated sludge reactor and subsequently enters an ANAMMOX biofilter; third, the sewage enters the nitrous acid biofilter, and then enters the ANAMMOX biofilter; fourth, the sewage enters the nitrous acid activated sludge reactor before entering the ANAMMOX activated sludge reactor; fifth, the sewage enters a single-segment biofilter reactor; and sixth, the sewage enters a single segment activated sludge reactor. The recycling and treating method for urban sewage in the invention has the advantages of good effect of sewage treatment, and low treatment costs.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a method specially used for regeneration treatment of urban sewage under normal temperature conditions with high efficiency and low energy consumption. Background technique [0002] At present, the key to water pollution lies in the eutrophication of water caused by excess phosphorus and nitrogen. Therefore, whether it is a new sewage recycling plant or an existing sewage plant, it is facing the urgent requirement of deep phosphorus and nitrogen removal from sewage. For the biological phosphorus removal and nitrogen removal system, due to the biological contradictions and competition between phosphorus removal bacteria and nitrogen removal bacteria, the main manifestations are the different requirements for dissolved oxygen and sludge age and the competition for carbon sources. When the phosphorus removal effect is good, the nitrogen removal effect ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52C02F3/30C02F3/12
CPCY02W10/10
Inventor 李冬张杰王俊安
Owner BEIJING UNIV OF TECH
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