Technology for pre-treating coal chemical wastewater through acidizing-compound flocculation process

A technology for coal chemical wastewater and chemical wastewater, which is used in flocculation/sedimentation water/sewage treatment, filtration treatment, sedimentation treatment, etc., can solve the problems of large investment, complex process flow, poor effect, etc., and achieves low investment and simple process flow. Reliable and economical results

Inactive Publication Date: 2019-03-29
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of poor effect, large investment and complicated process flow in the current pretreatment of coal chemical wastewater, the present invention provides a technology for pretreatment of coal c

Method used

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  • Technology for pre-treating coal chemical wastewater through acidizing-compound flocculation process

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Effect test

Embodiment 1

[0017] Take the coal chemical wastewater after acidification pretreatment, adjust its pH value with sodium hydroxide solution, then add a certain amount of polyferric sulfate solution, polyaluminum chloride solution and alum solution with a mass fraction of 5%, and stir rapidly for 1 min first, Then stir slowly for 10 minutes, then let it stand for precipitation for 30 minutes, and take the supernatant to detect the COD removal rate. The results show that the optimum pH values ​​of polyferric sulfate solution, polyaluminum chloride solution and alum solution are 8, 7, and 7, respectively. .

Embodiment 2

[0019] Use sodium hydroxide solution to adjust the pH value to the optimum pH value of various flocculants, add different amounts of flocculants to the wastewater according to the reasonable dosage of various flocculants from 20% to 120%, and stir quickly first 1min, then slowly stirred for 10min, and then allowed to settle for 30min, then took the wastewater supernatant to measure its COD, and calculated the COD removal rate. The results showed that the optimum dosages of polyferric sulfate, polyaluminum chloride and alum were 1.0g / L, 0.8g / L and 0.8g / L, respectively.

Embodiment 3

[0021] Take the coal chemical wastewater after acidification pretreatment, fix the dosage of polyferric sulfate at 1.0g / L, then use sodium hydroxide solution to adjust the pH value of the wastewater to the pH value of flocculant polyferric sulfate at 8, and then add different A large amount of polyacrylamide, first stirred rapidly for 1min, then stirred slowly for 10min, then allowed to settle for 30min, took the supernatant to measure its COD, measured its COD, and investigated the influence of polyacrylamide dosage on the COD removal rate, The results showed that the optimum dosage of coagulant polyacrylamide in composite flocculation was 0.02g / L.

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Abstract

The invention provides a technology for pre-treating coal chemical wastewater through an acidizing-compound flocculation process. Removal rate of COD in coal chemical wastewater can reach up to 77% orabove through the processes of treatment on the basis of gravity settling and filter cloth filtration, acidizing pretreatment with concentrated hydrochloric acid and compound flocculation pretreatment with poly-ferric sulfate solution, poly-aluminum chloride solution, alum solution and polyacrylamide. The pretreatment process is simple and reliable and is economical and low-cost.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an acidification-composite flocculation method for pretreatment of coal chemical wastewater. Background technique [0002] Coal chemical wastewater pretreatment generally includes acidification method, flocculation sedimentation method, air flotation method, MAP chemical precipitation method and solvent extraction dephenolization method, etc. Among them, the effect of the air flotation method on coal chemical wastewater treatment is average, and the power consumption is large and uneconomical; although the MAP chemical precipitation method and the solvent extraction dephenolization method are relatively effective, the cost of the former is relatively high, and the latter is extremely expensive. It is easy to cause secondary pollution. The acidification method can demulsify and remove oil from wastewater and reduce COD (chemical oxygen demand); the flocculation-sedimentati...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/001C02F1/40C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/007
Inventor 宁平王学谦候建国
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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