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A domestic sewage treatment process

A treatment process and domestic sewage technology, applied in biological water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the contradiction of mud age, slow growth of nitrifying bacteria, and affect nitrification function and other issues to achieve the effect of reducing high costs

Inactive Publication Date: 2019-06-18
HANGZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrifying bacteria reproduce slowly and have a long generation cycle. They belong to bacteria with a long sludge age. Too short sludge age will cause excessive efflux of nitrifying bacteria in the system and affect their nitrification function.
Therefore, in a unified sludge system, in order to obtain better phosphorus release, denitrification and nitrification effects at the same time, it will inevitably cause a contradiction in the sludge age in system operation.
In actual production, the A2 / O system often adopts a long sludge age of 10-15 days to meet the nitrification function, so the system sacrifices some organic matter degradation and phosphorus removal efficiency to a certain extent.

Method used

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  • A domestic sewage treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A domestic sewage treatment process carried out in cooperation with the above sewage treatment system, specifically comprising the following steps:

[0035] (1) Pretreat the sewage, specifically, enter the sewage into the grid well, use the grid in the grid well to filter and remove the large solid debris and part of the solid suspended matter in the sewage, and process it through the grit chamber to obtain Pretreatment of sewage;

[0036] (2) 85-90% of the pretreated sewage is subjected to anoxic treatment in the pre-anoxic tank, and the sludge age is 3-5 days;

[0037] (3) Enter the treated sewage into the flocculation tank for flocculation and sedimentation to obtain the upper layer liquid and the lower layer sludge;

[0038] (4) Perform anaerobic treatment and anoxic treatment on 80-90% of the supernatant and subsequent return sludge in sequence, and the sludge age is 5-10 days;

[0039] (5) Perform anaerobic treatment using the remaining pretreated sewage in step...

Embodiment 2

[0047] On the basis of Example 1, part of the lower layer sludge in step (3) was returned to the pre-anoxic tank for anoxic treatment.

[0048] When flocculating and settling in step (3), 200 g of flocculant is added to each cubic meter of sewage, and the flocculant includes by weight: 50 parts of polyacrylamide, 16 parts of sodium carboxymethylcellulose, nonylphenol polyoxyethylene ether 5 parts, calcium hydroxide 3 parts, polyferric chloride 7 parts, sodium alkylbenzene sulfonate 3 parts.

[0049] In step (9), a composite precipitant is used, and 50 g of a composite precipitant is added to each cubic meter of sewage. The composite precipitant includes: 10 parts of calcium polyacrylate, 6 parts of polyaluminum chloride, hydroxypropyl methylcellulose 5 parts, 5 parts of sodium pyrophosphate.

Embodiment 3

[0051] On the basis of Example 1 or 2, the mixed solution in step (6) is refluxed to step (4) for anoxic treatment, and the reflux ratio is 50-100%. The present embodiment is preferably 50%.

[0052] When flocculating and settling in step (3), 100 g of flocculant is added to each cubic meter of sewage, and the flocculant includes by weight: 50 parts of polyacrylamide, 18 parts of sodium carboxymethyl cellulose, nonylphenol polyoxyethylene ether 3 parts, 4 parts of calcium hydroxide, 8 parts of polyferric chloride, 1 part of sodium alkylbenzene sulfonate.

[0053] In step (9), a composite precipitant is used, and 80 g of a composite precipitant is added to each cubic meter of sewage. The composite precipitant includes 13 parts by weight of calcium polyacrylate, 8 parts of polyaluminum chloride, hydroxypropyl methylcellulose 3 parts, 6 parts of sodium pyrophosphate.

[0054] Sewage treatment is carried out by adopting the processes of Examples 1-3, wherein the embodiment adopt...

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Abstract

The invention relates to the technical field of sewage treatment and in particular relates to a household sewage treatment process. The process treats sewage by way of a pre-posed anoxic pond and a post-posed anoxic pond without supplementing a carbon source. The process has a relatively high nitrogen and phosphorus removal ability, and meanwhile, the reflux ratio of a reflux liquid is greatly reduced by the process, so that a lot of cost is lowered. In addition, the process also solves the problem of organic matter degradation and phosphorous removal efficiency caused by sludge age.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a domestic sewage treatment process. Background technique [0002] Domestic sewage is mainly the discharge water produced by various kitchen water, washing water and toilet water used in human life. Most of them are non-toxic inorganic salts. Domestic sewage contains a lot of nitrogen, phosphorus, sulfur, and many pathogenic bacteria. At present, the treatment of domestic sewage usually adopts the A2 / O process, which is also called the A-A-O process, which is the abbreviation of the first letter of the English Anaerobic-Anoxic-Oxic (anaerobic-anoxic-aerobic). In essence, this process should be anaerobic-anoxic-aerobic method, the abbreviation of biological nitrogen and phosphorus removal process. [0003] However, there are many problems in the current process. In the nitrogen and phosphorus removal A2 / O process, the carbon source is mainly consumed in phosphorus releas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/52C02F3/02C02F3/28C02F3/301C02F9/00C02F2209/40C02F2301/04C02F2301/08
Inventor 马占青温淑瑶谢萍华吕伟德何艺俞卫阳干雅平戴阿玲
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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