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Tech. for biochemical treating sulphur-containing chark waste water of high concentrating high ammonia nitrogen

A technology for coking wastewater and biochemical treatment, applied in the direction of sustainable biological treatment, multi-stage water/sewage treatment, biological water/sewage treatment, etc., can solve the problems of inability to directly treat coking wastewater, low removal rate of COD and ammonia nitrogen, and wastewater treatment cost Increase and other problems, to achieve the effect of obvious adsorption and removal, stable water output, and save treatment costs

Inactive Publication Date: 2006-06-28
重庆工学院
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Problems solved by technology

Conventional activated sludge treatment of coking wastewater has a very low removal rate of COD and ammonia nitrogen. Some studies have shown that the treatment rate of COD is less than 60%. Sometimes the conversion of organic nitrogen into ammonia nitrogen actually increases ammonia nitrogen.
In addition, the activated sludge method consumes a large amount of dilution water to treat coking wastewater, but the effluent is far from reaching the standard
For coking wastewater with high concentration, high ammonia nitrogen and high sulfur content, because excessive sulfur and ammonia nitrogen are toxic to microorganisms, the conventional activated sludge method cannot directly treat coking wastewater, and must be treated before entering the bioreactor. It needs to be diluted or desulfurized and denitrified, which will cause a substantial increase in the cost of wastewater treatment

Method used

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  • Tech. for biochemical treating sulphur-containing chark waste water of high concentrating high ammonia nitrogen
  • Tech. for biochemical treating sulphur-containing chark waste water of high concentrating high ammonia nitrogen
  • Tech. for biochemical treating sulphur-containing chark waste water of high concentrating high ammonia nitrogen

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Embodiment Construction

[0021] The following combination figure 1 Describe the specific implementation process of this process:

[0022] A COD of 1900-3400mg / L, NH 3 -N is 1400-2950mg / L, volatile phenol is about 600mg / L, sulfide is 400-888mg / L, cyanide is about 74.3mg / L, pH value is 9.67-9.82 Coking wastewater raw water and treated reflux water Stir and mix at a ratio of 1:1, add phosphoric acid to the reflux water, and adjust the pH of the mixed solution in the mixing tank to about 8.6. The mixing tank adopts the method of gas stirring, and the uniformly mixed wastewater enters the clarification tank to stand for clarification. The clarified wastewater is evenly sprayed or drip-irrigated at a rate of 3-4L / h in a 2.4m-high, 20cm-diameter bed. On the top layer of the 0.5m multi-layer mineralized garbage bioreactor bed, in a one-day operation cycle, water is continuously fed for 3-5 hours, and the rest is the time for the bed to fall freely. The COD of the effluent treated by the reaction bed is gen...

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Abstract

A biochemical process for treating the high-concentration coking sewage with high contents of ammoniacal nitrogen and S includes such steps as mixing it with the water returned from multi-layer mineralized garbage bioreactor bed, laying aside, taking supernatant, treating is said bioreactor bed, and returning part of the treated water for mixing with said coking sewage and the rest back to production line or discharging it.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment in environmental engineering technology, and in particular relates to a biochemical treatment process for coking wastewater with high concentration, high ammonia nitrogen and high sulfur content. Background technique [0002] Coking wastewater is produced in the process of high-temperature dry distillation of raw coal, gas purification and refining of chemical products. Coking wastewater mainly comes from coal washing, coke quenching, and by-product processing and refining processes. Coking wastewater is brown in color, has a heavy odor, complex components, and high toxicity. Its composition and properties vary with the type and quality of coking coal, carbonization temperature, gas refining and recovery process of chemical products. The pollutants contained in wastewater mainly include toxic substances such as phenol, ammonia nitrogen, cyanide, thiocyan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F3/10
CPCY02W10/10
Inventor 全学军张丽杰萧灿
Owner 重庆工学院
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