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Chemical wastewater treatment method

A technology of chemical wastewater and treatment methods, which is applied in the direction of special compound water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems that chemical wastewater cannot meet the discharge standards, and achieve the effect of improving treatment efficiency

Pending Publication Date: 2021-04-06
HUAIAN HIGH TECH INST OF LANZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for chemical wastewater, through demulsification and catalytic oxidation coupled with immobilized microorganisms to treat high-concentration chemical wastewater. Wastewater is biochemically treated to remove most organic matter, and the residual organic matter is degraded by secondary catalytic oxidation, which solves the problem that the existing chemical wastewater cannot meet the discharge standard

Method used

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  • Chemical wastewater treatment method

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Effect test

Embodiment 1

[0041] First, the wastewater collected in the sump is entered into the demulsification tank for demulsification and precipitation, and the sludge obtained after precipitation is discharged to the sludge concentration tank through the mud bucket. The method of dosing is to add flocculants to make the pH of the wastewater greater than 8, and to pretreat the powder suspensions and oily emulsions contained in the wastewater.

[0042] Lift the waste water obtained above from the lifting pump to the acid adjustment pool 1, start the acid, alkali, and hydrogen peroxide metering pumps in the pH online automatic control system in the acid adjustment pool 1, do the dosing, control the pH of the waste water to 3, and start the catalytic oxidation The valve of the aeration pipeline at the bottom of pool one can mix the chemical agent and wastewater evenly, and catalyze and oxidize the Fe in the porous ferroalloy filler in pool one. 2+ as H 2 o 2 Catalyst to generate OH with strong oxida...

Embodiment 2

[0046] This embodiment is the same as the steps of Embodiment 1, the difference is:

[0047] When the acid, alkali and hydrogen peroxide metering pumps in the pH online automatic control system in the acid adjustment pool 1 are turned on, the pH of the wastewater is controlled to be 3.5 and the reaction time is 2.5 hours when dosing. After the Fenton reaction is completed, the pH online automatic control system will The pH of the wastewater is adjusted back to 8. At this time, the COD removal rate of the anaerobic reactor is 70% or VFA<250mg / L. The added nutrients are ammonia water and ammonium dihydrogen phosphate. Adjust the reflux ratio of the sludge to 75%. Set The temperature in the biological aerobic reaction tank is 30°C, and the pH value of the sewage is 7.5, so that the DO concentration in the biological aerobic reaction tank is 4mg / L.

Embodiment 3

[0049] This embodiment is the same as the steps of Embodiment 1, the difference is:

[0050] When the acid, alkali and hydrogen peroxide metering pumps in the pH online automatic control system in the acid adjustment pool 1 are turned on, the pH of the wastewater is controlled to be 4 and the reaction time is 3 hours when dosing. After the Fenton reaction is completed, the pH online automatic control system will The pH of the wastewater was adjusted back to 8.5. At this time, the COD removal rate of the anaerobic reactor was 60% or VFA<300mg / L. The added nutrients were ammonium chloride and trisodium phosphate, and the reflux ratio of the sludge was adjusted to 50%. The temperature in the biological aerobic reaction tank is set to 20°C, the pH value of the sewage is 8.5, and the DO concentration in the biological aerobic reaction tank is 6mg / L.

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a chemical wastewater treatment method which comprises the following steps: S1, enabling wastewater collected in a water collecting tank to enter a demulsification tank for demulsification precipitation; S2, feeding the wastewater obtained in the step S1 into a front-end catalytic oxidation module for Fenton reaction; S3, sequentially feeding the wastewater obtained in the step S2 into a biological anaerobic reaction tank and a biological aerobic reaction tank in a biochemical module through a water distribution pipe from high to low for reaction, and removing most organic matters in the wastewater by utilizing microorganisms; and S4, feeding the wastewater obtained in the biological aerobic reaction tank in S3 into a tail end catalytic oxidation module, carrying out catalytic degradation on residual organic matters in the wastewater again, and discharging the treated wastewater after the wastewater meets the sewage discharge standard. High-concentration chemical wastewater is treated through demulsification and catalytic oxidation coupled immobilized microorganisms, residual organic matter is degraded through secondary catalytic oxidation, and the problem that existing chemical wastewater cannot reach the discharge standard is solved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for chemical wastewater. Background technique [0002] Chemical wastewater is process wastewater, cooling water, exhaust gas washing water, equipment and site flushing water discharged from chemical production. It generally has a high concentration, complex components, strong biological toxicity, and difficult treatment. If high-concentration industrial wastewater is discharged directly without treatment, it will cause water pollution and affect the normal production of industry and agriculture. Because the toxic components in chemical wastewater have a certain accumulation in organisms, they have obvious oxygen-consuming properties in water bodies, which can easily deteriorate water quality and endanger human health. [0003] Traditional chemical wastewater treatment methods generally include chemical treatment and biochemical treatment. Chemical tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F1/56C02F1/66C02F1/725C02F1/722C02F2305/026C02F3/30C02F2101/30C02F2305/06
Inventor 李静宋雨贤彭涛孙亚洲
Owner HUAIAN HIGH TECH INST OF LANZHOU UNIV
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