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Advanced treatment recycling technique of urban sewage

A technology for advanced treatment of urban sewage, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc. It can solve the problem of high salt concentration in effluent and insufficient water reuse Requirements and other issues to achieve the effect of reducing environmental pollution, reducing emissions, and solving water problems

Inactive Publication Date: 2008-07-02
蓝星环境工程有限公司
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  • Description
  • Claims
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Problems solved by technology

Although the water treated by this method has removed BOD, COD, SS, ammonia nitrogen, etc. in the water, the concentration of salt in the effluent is relatively high, which still cannot meet the requirements for water reuse in various situations.

Method used

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  • Advanced treatment recycling technique of urban sewage
  • Advanced treatment recycling technique of urban sewage
  • Advanced treatment recycling technique of urban sewage

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[0056] The cooling water reuse process of a cold rolling steel plant adopts the above-mentioned MBR+RO system of the present invention to treat the urban secondary discharge water, and the water after RO treatment is blended to reuse cooling water for cold rolling steel. The pretreatment water volume of this project is 10000m 3 / D, where (MBR) water production is 450m 3 / h, reverse osmosis water production 300m 3 / h.

[0057] Process parameters:

[0058] MBR membrane module: Mitsubishi Rayon: SUR-334

[0059] Effective membrane area: 3m 2 × 40 pieces = 120m 2

[0060] Component specifications: 663.5mm×1538mm×1441.5mm

[0061] Design flux: flux 15LMH=8.8GFD;

[0062] Single membrane water production: 1.8m 3 / h;

[0063] MBR system running time: 23 hours, stop aeration for 1 hour;

[0064] Design scale per unit time of MBR system: 626m 3 / h

[0065] MBR system membrane module quantity: 350 groups

[0066] MBR membrane area: 43000m 2

[0067] Reverse osmosis (RO) ...

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Abstract

The invention relates to water treatment field, in particular to a process of advanced treatment and recycle of urban sewage, which adopts a membrane bioreactor and inverse penetration in combination. The invention takes secondary effluent of urban sewage treated by sewage plant or water of urban sewage being treated to meet the standard of secondary effluent as raw water; the raw water enters the membrane bioreactor MBR system for biochemical pretreatment to remove BOD, COD, SS, ammonia and nitrogen in the water to ensure that the water after treatment meets the quality requirement of reverse osmosis feed water; further water desalination is carried out through reverse osmosis system, and the needed recycle water can be obtained. By adopting MBR technology, removal rate of the main contamination COD can reach over 95 percent, the suspended matter and turbidity of the treated water are close to zero and the quality of the treated water is good and steady; according to process requirements, the water treated by the MBR system and the reverse osmosis system in sequence can be used as cooling water of cold rolled steel, after being blended according to certain proportion, thus realizing recycling of sewage.

Description

technical field [0001] The invention relates to the technical field of water treatment, and relates to a process for advanced treatment and reuse of urban sewage using a membrane bioreactor combined with reverse osmosis. Background technique [0002] Using urban sewage as the second water source can alleviate the shortage of water resources, and urban sewage can be reused after proper treatment, which can promote the virtuous cycle of water in nature. Due to the large amount of urban sewage, it is desirable to collect it nearby, and the water quality and quantity are relatively stable and reliable. As a second water source, it is much more reliable than using rainwater and seawater; secondly, sewage recycling can reduce the pollution of rivers and lakes, and protect water resources from damage. Reduce water costs and sewage purification costs. The larger the water volume of the recycling project, the smaller the investment per ton of water, the lower the cost, and the more ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/02C02F1/44
CPCY02A20/131Y02W10/10
Inventor 王宇彤苏立国陈恩惠
Owner 蓝星环境工程有限公司
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