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Sewage physicochemical treatment method and device

A treatment method and technology for sewage, applied in neutralized water/sewage treatment, reduced water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of high operating cost, improve biodegradability, reduce COD, and reduce toxicity Effect

Inactive Publication Date: 2012-04-25
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 from the production of forging additives. After testing, the production wastewater contains 330mg / L of copper, pH=1.9, COD of 7895mg / L, and purple. Dilute 1:10 with the influent water of the sewage treatment plant. After testing and dilution, the water copper content is 39mg / L, pH=2.9, and COD is 1285mg / L. Use the physicochemical method of the present invention to process, first add 300mg / L of composite flocculant to adjust the pH to 7.5, then add 200mg / L of composite reducing agent, 150mg / L of composite oxidant, 2mg / L of coagulant, and mix and stir to react separately After 30 minutes, settling for 30 minutes and air floating for 20 minutes. Take the supernatant after precipitation and air flotation to detect copper content of 2.6mg / L, PH=6.8, COD of 320mg / L. The supernatant is added to the biological reaction tank (CASS reaction tank) for aeration biological treatment, and the physical and chemical treatment...

Embodiment 2

[0036] Take the influent water of the sewage plant when the enterprise discharges the production wastewater in excess of the standard. The detected sewage contains 5.3mg / L of hexavalent chromium, pH=2.6, and COD of 674mg / L. Use the physicochemical method of the present invention to process, first add 400mg / L of sodium hydroxide to adjust the pH to 6.0, then add a total of 300mg / L of compound reducing agent, 200mg / L of compound flocculant, 250mg / L of compound oxidant, and coagulant aid 2mg / L, mixed and stirred for 30 minutes, precipitated for 30 minutes, and floated for 20 minutes. The supernatant after precipitation and air flotation was tested to contain 0.38 mg / L of hexavalent chromium, PH=6.5, and COD of 350 mg / L. The supernatant was added to the biological reaction tank (CASS reaction tank) for biological treatment, and the physicochemical treatment effect was checked. After the biological reaction tank was treated, the effluent contained hexavalent chromium 0.03mg / L, PH=6....

Embodiment 3

[0038] The waste water from the shoe material factory is milky white and contains a lot of latex. 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 the dilution, the pH of the water is 7.1, COD. It is 1370mg / L. The physicochemical method of the present invention is used for treatment, adding 200 mg / L of composite reducing agent, 100 mg / L of composite flocculant, 350 mg / L of composite oxidant, and 1 mg / L of coagulant. After mixing and stirring for 30 minutes, the precipitation is 30 minutes. Minutes, air floatation for twenty minutes. Take the supernatant after sedimentation and air flotation for detection, containing COD cr It is 412mg / L, the supernatant is added to the biological reaction tank (CASS reaction tank) for biological treatment, and the effect of physical and chemical treatment is tested. The COD in the effluent of the biological reaction tank is 85mg / L. Observe that the acti...

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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. Theinvention 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, andhaving the advantages of convenient operation and low running cost.

Description

Technical field [0001] The invention belongs to the field of sewage treatment, and particularly relates to a sewage physicochemical treatment method suitable for the treatment of difficult-to-degrade organic matter and heavy metals in sewage, especially for the treatment of sewage substances that are toxic to microorganisms, and advanced treatment of garbage leachate. Device. Background technique [0002] At present, among the 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 difficult-to-degrade organics, 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 a combination of physical and chemical treatment methods is the best way. For th...

Claims

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Application Information

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