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Method for treating sewage based on physical chemical coagulation method

A technology of physical chemistry and coagulation method, which is applied in the field of sewage treatment based on physical and chemical coagulation method, can solve the problems of increasing sewage treatment costs, etc., and achieve the effect of improving comprehensive utilization rate, improving phosphorus removal effect, and wide treatment range

Inactive Publication Date: 2017-12-15
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires new equipment for fast and accurate flow rate control, which will increase the cost of sewage treatment, and the maintenance and repair of subsequent equipment will further increase the cost of sewage treatment

Method used

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  • Method for treating sewage based on physical chemical coagulation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of method that the present invention proposes based on physicochemical coagulation process sewage treatment comprises the following steps:

[0018] S1. The sewage to be treated is pretreated through a coarse grid with a grid spacing of 40mm and a fine grid with a grid spacing of 10mm in sequence, and then transferred to the grit chamber to remove sand particles with a particle size greater than 0.2mm in the sewage and separate them. The obtained sewage flows into the pH adjustment tank again;

[0019] S2. Add acid or alkali regulator to the pH adjustment tank, adjust the pH value of the sewage to 6.5-8.5, then add barium nitrate, stir for 15 minutes, then add phosphorus removal agent and coagulation aid, stir for 10 minutes and then stand still for 90 minutes , and then the precipitate and clarified liquid are separated;

[0020] S3. Add acid or alkali regulator to the clarified liquid separated in step S2, adjust the pH value of the clarified liquid to 7-8.2, a...

Embodiment 2

[0023] A kind of method that the present invention proposes based on physicochemical coagulation process sewage treatment comprises the following steps:

[0024] S1. The sewage to be treated is pretreated through a coarse grid with a grid spacing of 30 mm and a fine grid with a grid spacing of 5 mm, and then transferred to the grit chamber to remove sand particles with a particle size greater than 0.2 mm in the sewage and separate them. The obtained sewage flows into the pH adjustment tank again;

[0025] S2. Add an acid or alkali regulator to the pH adjustment tank, adjust the pH value of the sewage to 6.5-8.5, then add barium chloride, stir for 20 minutes, then add phosphorus removal agent and coagulation aid, stir for 8 minutes and then stand still 60min, then the precipitate and clarified liquid were separated;

[0026] S3. Add acid or alkali regulator to the clarified liquid separated in step S2, adjust the pH value of the clarified liquid to 7-8.2, and flow to the steri...

Embodiment 3

[0029] A kind of method that the present invention proposes based on physicochemical coagulation process sewage treatment comprises the following steps:

[0030] S1. The sewage to be treated is pretreated through a coarse grid with a grid spacing of 40mm and a fine grid with a grid spacing of 6mm, and then transferred to the grit chamber to remove sand particles with a particle size greater than 0.2mm in the sewage and separate them. The obtained sewage flows into the pH adjustment tank again;

[0031] S2. Add an acid or alkali regulator to the pH adjustment tank to adjust the pH value of the sewage to 6.5-8.5, then add barium nitrate and barium chloride, stir for 20 minutes, then add phosphorus removal agent and coagulation aid, and stir for 10 minutes Stand still for another 70 minutes, and then separate the sediment and clarified liquid;

[0032] S3. Add acid or alkali regulator to the clarified liquid separated in step S2, adjust the pH value of the clarified liquid to 7-...

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Abstract

The invention discloses a method for treating sewage based on a physical chemical coagulation method. The method comprises the following steps that 1, sewage is pretreated by a coarse screen and a fine screen and then transferred to a grit chamber so that sand grains can be removed, and the sewage obtained after separation flows into a pH regulating tank; 2, an acid or alkali regulating agent is added to the pH regulating tank, then soluble barium salt, a phosphate removing agent and a coagulant aid are added to the pH regulating tank, the sewage is stirred first and then subjected to settlement, and accordingly sediments are separated from clear liquid; 3, an acid or alkali regulating agent is added to the clear liquid, the clearing liquid passes through grating film and flows into a sterilization tank, then the sterilized sewage is transferred to an aeration tank to be subjected to aeration treatment, the sewage after aeration treatment is transferred to a recycle tank, and the physical chemical coagulation treatment of the sewage is completed. The method for treating the sewage is good in sewage treatment effect, wide in treatment range and low in treatment cost, and the treated sewage can be recycled and reused, so that the problem of difficult sewage treatment is solved, and meanwhile the comprehensive utilization ratio of the sewage can also be improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating sewage based on a physical-chemical coagulation method. Background technique [0002] Water is the most basic condition for people to survive and develop. People use water every day and also produce sewage continuously. Not only will sewage be produced in life, but also a large amount of sewage will be produced in the process of agricultural and industrial production. If it is discharged directly without treatment, it will not only cause environmental pollution, but also cause waste of water resources. Therefore, how to rationally and effectively carry out sewage treatment and reuse is an urgent problem to be solved at present. [0003] Chinese Patent Publication No. CN94111868.1 discloses a physical and chemical coagulation sewage treatment method, in which the sewage is sent into the pipeline through pumping equipment, and in the operating state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
CPCC02F1/001C02F1/283C02F1/44C02F1/5236C02F1/5245C02F1/58C02F1/66C02F7/00C02F9/00C02F2001/007C02F2301/08C02F2303/04
Inventor 项心力
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