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Sewage physicochemical treatment method and device

A treatment method and sewage technology, which is applied in the direction of water/sewage multi-stage treatment, oxidized water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of high operating cost, improve biodegradability, reduce COD, reduce toxic effect

Inactive Publication Date: 2009-10-21
GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This public document mentions that during coagulation and sedimentation, to adjust the pH value of landfill leachate to 10.5-11.0, a large amount of NaOH needs to be used, which makes the operating cost higher

Method used

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  • Sewage physicochemical treatment method and device
  • Sewage physicochemical treatment method and device
  • Sewage physicochemical treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take the production wastewater containing heavy metal copper in the production of forging additives. After testing, the production wastewater contains 330mg / L copper, pH=1.9, COD is 7895mg / L, and the color is purple. Diluted with water from sewage treatment plant at 1:10, after testing, the copper content in the diluted water was 39mg / L, pH=2.9, and COD was 1285mg / L. Utilize the physicochemical method of the present invention to process, first add 300 mg / L of composite flocculant to adjust the pH to 7.5, then add 200 mg / L of composite reducing agent, 150 mg / L of composite oxidant, and 2 mg / L of coagulant aid, mix and stir respectively After 30 minutes, settling for 30 minutes and air flotation for 20 minutes. The supernatant after the precipitation air flotation was taken to detect that the copper content was 2.6mg / L, the pH=6.8, and the COD was 320mg / L. Add the supernatant to the biological reaction tank (CASS reaction tank) for aerated biological treatment, and detec...

Embodiment 2

[0036] Take the influent of the sewage plant when the enterprise discharges production wastewater exceeding the standard. After testing, the sewage contains 5.3mg / L of hexavalent chromium, pH=2.6, and COD is 674mg / L. Utilize the physical and chemical method of the present invention to process, first add sodium hydroxide 400mg / L to adjust pH to 6.0, then add a total of 300mg / L of composite reducing agent, 200mg / L of composite flocculant, 250mg / L of composite oxidant, coagulant 2mg / L, after mixing and stirring for 30 minutes, sedimentation for 30 minutes, and air flotation for 20 minutes. The supernatant after air flotation of the precipitate was taken to detect that the hexavalent chromium content was 0.38mg / L, the pH=6.5, and the COD was 350mg / L. Add the supernatant to the biological reaction tank (CASS reaction tank) for biological treatment, and check the effect of physical and chemical treatment. After the treatment of the biological reaction tank, the effluent contains 0.0...

Embodiment 3

[0038] Take the waste water from the shoe material factory, which is milky white and contains a lot of latex components. The pH is 7.0 and the COD is 26564mg / L. It is diluted with the normal influent water of the sewage treatment plant at a ratio of 1:20. After dilution, the pH of the diluted water is 7.1 and the COD is 7.1 It is 1370mg / L. Utilize the physicochemical method of the present invention to process, add composite reducing agent 200mg / L, composite flocculant 100mg / L, composite oxidant 350mg / L, coagulant aid is 1mg / L, after mixing and stirring reaction for 30 minutes, precipitation 30 Minutes, air flotation for twenty minutes. Take the supernatant after the sediment air flotation test, including COD cr The supernatant was added to the biological reaction tank (CASS reaction tank) for biological treatment, and the effect of physical and chemical treatment was checked. The COD in the effluent of the biological reaction tank was 85mg / L. Observe that the activated sludg...

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Abstract

The invention discloses a sewage physicochemical treatment method and a device. The method has the concrete steps that: (1) the PH value of the sewage is measured; (2) when the PH value of the sewage exceeds the range of 5 to 8, acid or alkali is added to adjust the PH value to range from 5 to 8; (3) composite reducing agent is added to the sewage of the step (2) for reaction; (4) composite flocculant is added to the sewage of the step (3) for reaction; (5) composite oxidant is added to the sewage of the step (4) for reaction; (6)coagulant aid is added to the sewage of the step (5) for reaction; (7) the sewage to which the medicines are added is processed by solid-liquid separation, and then settled sludge and floating slag are removed; and (8)finally qualified water can be taken out. The invention provides the sewage physicochemical treatment method and the device, capable of efficiently treating substances and heavy metals which are hard to be degraded by microbes in the sewage, and having the advantages of convenient operation and low running cost.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a sewage physical and chemical treatment method suitable for treating refractory organic matter and heavy metals in sewage, especially substances that are toxic to microorganisms in sewage, and advanced treatment of landfill leachate. device. Background technique [0002] At present, in sewage treatment methods, some use biological methods for treatment, and some use a combination of chemical and physical treatment methods. With the continuous development of sewage treatment technology, the removal of refractory organic matter, heavy metals, and substances that are toxic to sewage treatment microorganisms in sewage has become an urgent problem to be solved. However, the above-mentioned biological treatment methods cannot solve this technical problem, and the combination of physical and chemical treatment methods is the best way. For the physical and chemical method o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/70C02F1/52C02F1/72
Inventor 孙志民
Owner GUANGZHOU MUNICIPAL ENG DESIGN & RES INST CO LTD
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