Method and system for sewage treatment

A treatment method and technology of a treatment system are applied in the field of sewage treatment method and treatment system, which can solve the problem of high cost of sewage removal hardening process, achieve good hard removal effect, improve economic benefit and reduce process cost.

Inactive Publication Date: 2019-08-23
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a sewage treatment method and treatment system to solve the problem of high cost of sewage hard removal process in the prior art

Method used

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  • Method and system for sewage treatment

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preparation example Construction

[0044] In the above step of adding a coagulant, the coagulant includes a flocculant. More preferably, after obtaining the first sediment, the preparation method includes: adding a flocculant to the second treated sewage to obtain a flocculant containing For the third sewage treatment of sediment, the flocculant can be selected from polyacrylamide (PAM), polyiron (PE), etc.; then, the third sewage treatment is subjected to solid-liquid separation treatment to obtain hard wastewater and flocculated sediment .

[0045] More preferably, the above-mentioned coagulant also includes a coagulant, and before the step of adding calcium carbide slag to the sewage, the treatment method also includes the step of adding a coagulant to the sewage, and the above-mentioned coagulant can be selected from ferric chloride , alum and ferrous sulfate.

[0046] The above contains Ca 2+ , Mg 2+ The precipitate and colloid further react with the coagulant containing coagulant and flocculant to dest...

Embodiment 1

[0065] The present embodiment provides a kind of treatment method of sewage, comprises the following steps:

[0066] Feed sewage with a total hardness of 900mg / l into the coagulation reaction zone 110 of the sedimentation tank 100, and simultaneously add ferric chloride;

[0067] Make the sewage flow from the coagulation reaction zone 110 to the carbide slag reaction zone 120, and add carbide slag at the same time, and the reaction time is 100s;

[0068] Make the sewage flow from the calcium carbide slag reaction zone 120 to the carbonate reaction zone 130, and add sodium carbonate at the same time, and the reaction time is 90s;

[0069] Make the sewage flow from the carbonate reaction zone 130 to the flocculation reaction zone 140, and add polyacrylamide (PAM) at the same time, and the reaction time is 90s;

[0070] The sewage flows from the flocculation reaction zone 140 to the sedimentation zone 150, and the sedimentation time is 1800s.

[0071] Among them, the weight rat...

Embodiment 2

[0073] The difference between this embodiment and embodiment 1 is:

[0074] The weight ratio of calcium carbide slag to sodium carbonate is 2:1, the weight ratio of hard removing agent to coagulant is 8:1, and the weight ratio of coagulant to flocculant is 3:1.

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Abstract

The invention provides a method and system for sewage treatment. The treatment method comprises the step of adding hardness-removal agents and a coagulant to sewage so as to obtain hardness-removed sewage and a flocculated precipitate, wherein the hardness-removal chemical agents comprise calcium carbide slag and soluble carbonate. According to the method, the hardness-removal chemical agents including the calcium carbide slag and soluble carbonate and the coagulant are added to the sewage so as to obtain the hardness-removed sewage and the flocculated precipitate, and a combination of the calcium carbide slag and soluble carbonate is adopted to replace conventional alkaline regulators including sodium hydroxide and sodium carbonate in the prior art, so that not only can a good hardness-removal effect on the sewage be achieved, but also the calcium carbide slag can be turned from waste into treasure, the process cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method and treatment system. Background technique [0002] In the prior art, after the inorganic waste water produced in industrial production is treated, the clean water is reused as reclaimed water. Among them, hardness is an important water quality index of purified sewage, which has received extensive attention in drinking water and industrial water. Hardness Too high will cause many problems in the process of municipal water and industrial water, and even nephritis in the human body is considered to be related to the high hardness of the water, so it is very necessary to remove the hardness of high hardness water. [0003] At present, the method of removing hardness in sewage is generally to add chemicals, such as sodium hydroxide, sodium carbonate, etc. Although these chemicals have a good effect in removing hardness, they are generally expensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/5245C02F1/5281C02F1/56C02F1/58C02F5/02C02F9/00C02F2209/055C02F2209/07C02F2209/08
Inventor 李成贺飞莘振东李晓华叶飞朱德汉武海杰
Owner CHNA ENERGY INVESTMENT CORP LTD
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