Method for removing carbon, nitrogen and sulfur in waste water

Abstract

The invention belongs to the technical field of waste water treatment and relates to a process method for conducting removal treatment on waste water containing carbon, nitrogen and sulfur, in particular to a method for removing the carbon, the nitrogen and the sulfur in the waste water. The method comprises five processing steps of oxidation treatment, neutralization sediment, sulfate reduction,methane generation and deep treatment by a sequencing batch reactor. Firstly ferrite and hydrogen peroxide are added in the waste water to conduct redox to obtain first-class effluent after being mixed, then alkali is added to conduct coagulating sedimentation to remove organic matters to obtain second-class effluent, a two-phase anaerobic process is introduced to conduct sulfate reductive treatment, methane generation treatment is carried out to obtain energy methane raw materials and fourth-class effluent, and finally the deep treatment is carried out on the fourth-class effluent by using the sequencing batch reactor, and purified effluent is obtained through treatments of an aerobic process and an anaerobic process. The method is strong in practical applicability, safe and stable in operation and good in treatment effect, chemical oxygen demand and removal rates of ammonia nitrogen and sulfate are more than 95%, and the effluent quality reaches the standard.

Description

Technical field: [0001] The invention belongs to the technical field of waste water treatment, and relates to a process method for removing waste water containing carbon, nitrogen and sulfur, in particular to a method for removing carbon, nitrogen and sulfur in waste water. Background technique: [0002] At present, the wastewater discharged from many industries in industrial and agricultural production, such as petrochemical industry, paper industry, leather industry, pharmaceutical industry, etc., generally contains a large amount of organic matter, ammonia nitrogen, and sulfate that are difficult to biodegrade, and these wastewaters are toxic. Strong, high concentration and poor biodegradability are the difficulties and key points in the treatment of industrial wastewater. The methods used for these wastewater treatment mainly include dilution, incineration, wet catalytic oxidation, air flotation, adsorption, coagulation sedimentation, biochemical and membrane technology....

AI Technical Summary

Problems solved by technology

These existing treatment methods generally have disadvantages such as unsatisfactory treatment effect and poor operation stability; some need to add a large amount of chemical agents, and the energy consumption is also high during operation, resulting in high cost of wastewater treatment; A large amount of sludge will be generated, causing secondary pollution

In addition, due to the presence of a large amount of sulfate, the hydrogen sulfide produced will inhibit the activity of microorganisms, and sulfate-reducing bacteria will also inhibit methanogens due to competition with methanogens for substrates. These problems The existence of the existing wastewater treatment technology is generally not ideal, and some will cause secondary pollution to the ecological environment

Chinese Patent No. 201110080532.7 discloses a treatment method and device for sulfur- and phenol-containing wastewater; Chinese Patent No. 02100855.8 discloses a method for comprehensive desulfurization, deamination, and dephenolization of wastewater containing high sulfur, ammonia, and phenol; Chinese Patent No. 200910213798.7 discloses a biological wastewater treatment method for simultaneous desulfurization, denitrification, and decolorization; analysis of the above-mentioned disclosed technical solutions shows that the treatment methods and devices in the prior art still have the difficulty of synchronously removing carbon in wastewater , nitrogen and sulfur, the treatment cost and energy consumption are high, the treatment effect is not easy to reach the standard, and the coupling between each operation unit is poor, etc.

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