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A method for advanced treatment of secondary biochemical effluent of urban sewage

A secondary biochemical effluent and advanced treatment technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Salt process and other problems, to achieve the effect of simple treatment process, short process and low operating cost

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this process method chooses ozone oxidation treatment, it is difficult to completely mineralize organic matter with low concentration and short residence time of ozone, and it does not have a desalination process. Therefore, this method is mainly suitable for secondary biochemical treatment of urban sewage with low salt content. Outlet water, the conductivity and total salt of the treated effluent water cannot meet the water quality requirements for reuse as industrial boiler feed water
[0004] Based on the above analysis, for the secondary biochemical treatment effluent of urban sewage treatment plants with a relatively high proportion of industrial wastewater, there is currently no reliable treatment due to the high COD, chroma, hardness, alkalinity, and conductivity of refractory biodegradability. Reuse, especially the process technology of reuse as industrial boiler feed water

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  • A method for advanced treatment of secondary biochemical effluent of urban sewage

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Embodiment 1

[0021] The treatment method of the present invention is used to conduct an advanced treatment test on the secondary biochemical effluent of a domestic urban sewage treatment plant. Because the influent water of the urban sewage treatment plant contains a large amount of pharmaceutical wastewater that is difficult to biodegrade, after secondary treatment, the biochemical effluent COD100~140mg / L, pH7.2~7.5, ammonia nitrogen 28-35mg / L, chroma 175~ 200 degrees, BOD 5 0~5mg / L, turbidity 10~25NTU, total hardness 380~520mg / L, total alkalinity 350~400mg / L, conductivity 3000~3200μs / cm.

[0022] Adopt the method of the present invention, carry out combination treatment test to above-mentioned waste water. Wastewater treatment scale is 1m 3 / h, the main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 1. After being treated by the method of the present invention, the effluent index can meet the water quality requirements f...

Embodiment 2

[0026] The treatment device of Example 1 was used to treat the same sewage as in Example 1, and the wastewater treatment effects obtained by changing the operating conditions of each treatment unit are shown in Table 2.

[0027] Main processing unit constitution and processing effect of table 2 embodiment 2

[0028] Handling unit name Processing device scale and main components Main operating conditions and control parameters Treatment effluent or effect 1 lime softened Pipe mixer, material PVC. Wastewater flow 1m 3 / h; add saturated milk of lime 650mg / L; the pH value of the mixture is 10.50. Influent COD 140mg / L, pH 7.45, ammonia nitrogen 28 mg / L, color 200 degrees, BOD 5 2.5mg / L, turbidity 15NTU, total hardness 384mg / L, total alkalinity 980 mg / L, conductivity 3150μs / cm. 2 coagulation sedimentation tank PVC material, volume 0.5m 3 , The built-in agitator stirs the flocculant. Wastewater flow 1m 3 / h; add polyferric sulfate inorganic floc...

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Abstract

The invention discloses a method for advanced treatment and reuse of secondary biochemical effluent of urban sewage, comprising the following treatment steps: (1) lime softening treatment; (2) coagulation and sedimentation treatment; (3) oxidation treatment; (4) filtration treatment (5) ultrafiltration and reverse osmosis treatment; wherein, the oxidation treatment described in step (3) uses ozone as the oxidant, and an adsorbent bed is set in the oxidation reactor. The method is simple in operation, short in process and low in treatment cost. It is suitable for treating effluent from urban sewage treatment plants with high COD, chroma and salt content, and achieves the purpose of resource utilization of sewage and industrial water saving, and is in line with circular economy and clean production. requirements.

Description

technical field [0001] The invention relates to a method for advanced treatment of secondary biochemical effluent of urban sewage, which is suitable for treating effluent of urban sewage treatment plants with high COD, chroma, hardness and salt content. Background technique [0002] Advanced treatment and reuse of urban sewage is one of the effective ways to solve the current urban water shortage problem. Urban sewage is a potential water resource with stable water quantity and reliable supply. After conventional biochemical treatment, although BOD 5 It has been treated to 10mg / L, or even below 5mg / L, but the COD of the secondary biochemical effluent is still as high as 100mg / L, containing some refractory organic matter, chroma and inorganic salts, which cannot meet the water quality requirements for reuse as industrial boiler feed water . [0003] At present, the combined method of "coagulation + clarification + filtration + disinfection" is usually used for advanced trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张蕾李宝忠郭宏山许莹朱卫
Owner CHINA PETROLEUM & CHEM CORP