Pretreatment technology of high-salinity wastewater

A high-salt wastewater pretreatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of water hardness and silicate cannot be removed, and improve Pretreatment effect, saving chemicals, and reducing the effect of influent turbidity

Inactive Publication Date: 2015-04-29
BEIJING SCINOR WATER TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this conventional reverse osmosis pretreatment cannot remove the hardness and silicate in the water

Method used

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  • Pretreatment technology of high-salinity wastewater

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Embodiment 1

[0047] A high-salt wastewater pretreatment process, first remove the hardness of the sewage, and then add drugs to remove SiO 2 , and finally flocculated and precipitated.

[0048] The specific operation steps are:

[0049] 1) First, let the sewage enter the chemical reaction tank, add soda ash and soda lime to the water, and stir with a high-speed mixer to make the chemical react with the raw water quickly and remove the hardness in the water;

[0050] 2) Then enter the coagulation dosing tank, add magnesium and coagulant, stir with a high-speed mixer, the SiO in the sewage 2 React with magnesium agent and precipitate out to form precipitable flocs;

[0051] 3) After entering the flocculation sedimentation-concentration tank system, the alum flowers and water are separated, and the sludge deposited at the bottom of the tank is accelerated and concentrated by the thickening agitator equipped with a mud scraper system, and part of the sludge is continuously circulated...

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Abstract

The invention discloses a pretreatment technology of high-salinity wastewater. The technology comprises the following steps: feeding sewage into a chemical reaction pond, feeding sodium carbonate and soda lime to water according to the sewage quality characteristics, and rapidly reacting with raw material, crystallizing and separating out kinds of scale forming matters in water, and removing the hardness in water; feeding the sewage to a coagulation dosing pool, feeding a magnesia mixture to the sewage which is subjected to hardness treatment in the step 1, reacting with SiO2 and the magnesia mixture in the sewage, participating and separating out; destabilizing colloid under the action of a coagulant and forming a precipitable flocculent body; feeding the sewage to a flocculent precipitation-concentration pond system, separating alumen ustum from water, accelerating concentration of the sludge participating at the bottom of the pond by virtue of a concentration stirrer with a mud scraper system; and continuously circulating partial sludge into a flocculation basin, simultaneously extracting the residual sludge at regular periods, and feeding to a sludge treatment system. The technology disclosed by the invention has the advantages of full chemical reaction, low residual hardness, good flocculent precipitation effect and impact load resistance and the like; and agents are saved.

Description

technical field [0001] The invention relates to a pretreatment process in a sewage treatment process. Background technique [0002] Due to the growth of population and the development of social economy, the water consumption of human beings is gradually increasing, and the original water resources are polluted. These series of reasons lead to the shortage of water resources and have become the restrictive factors for the sustainable development of my country's economy. In order to solve the problems of water shortage and water pollution, the reuse of brackish water, seawater and urban sewage has become the key to solving the problem. [0003] High salt water refers to wastewater with a total salt content (calculated as NaCl content) of at least 1%, mainly including saline industrial wastewater, saline domestic sewage and other saline wastewater. According to the source of saline wastewater, saline wastewater can be divided into: wastewater discharged during the direct use o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F1/5236C02F5/02C02F2101/10
Inventor 谷维梁程方琳王为民张松建
Owner BEIJING SCINOR WATER TECH CO LTD
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