New process for treating coal gasification wastewater with active coke

Abstract

The invention relates to a new process for treating coal gasification wastewater with active coke, which comprises the following steps: first-stage absorption is carried out on coal gasification wastewater by directly using active coke to remove most of COD, suspended matters and chroma; after the absorption treatment, the outlet water enters an immobilized microbe-anaerobe filter chamber (hereinafter referred to as I-AF) and immobilized microbe-aerobe aeration biological filter (hereinafter referred to as I-BAF) system to be biologically treated, thereby removing most of ammonia nitrogen and COD in the wastewater; second-stage deep absorption is carried out on the outlet water performed by I-AF+I-BAF processing by using active coke; and the outlet water satisfies Grade 1 in Sewage Comprehensive Emission Standard GB8978-96. Compared with the traditional treatment process, the invention has the advantages of simple technical process, low treatment cost, favorable COD and ammonia nitrogen removal effect, small occupation area of facilities, and convenient operational management. In addition, the saturated active coke can be recycled by heating in the anaerobic atmosphere, and the phenols in the saturated active coke can be recycled or the saturated active coke can be directly used as fuel. The invention can be used for treating coal gasification wastewater, coked wastewater and the like at low cost, and has unique effects for treating various high-concentration industrial wastewaters and modifying the prior processes.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, in particular to a new process for treating coal gasification wastewater with activated coke. Background technique [0002] Coal gasification waste water is produced during the coal gas production process, and the coal gas needs to be sprayed and washed with a large amount of cooling water at the outlet of the gasifier. The water quality of coal gasification wastewater is complex, brown in color, has a strong phenolic ammonia odor, is moderately alkaline, contains high concentrations of phenolic substances, and has a variety of types. In addition, it also contains a large amount of cyanide, ammonia nitrogen, fatty acids and other toxic organic pollutants. Many of these pollutants are priority pollutants determined by the US EPA. If these pollutants are discharged into the environment, they will cause great harm to the ecological environment and human health. Therefore, the treatme...

AI Technical Summary

Problems solved by technology

However, the cost and energy consumption of the electrochemical method is high; the coagulation-sedimentation method covers a large area, consumes a lot of chemicals, costs high, and produces a large amount of sludge; although the advanced oxidation method is effective, it requires high equipment requirements , the operation is complicated and consumes a lot of energy, and the cost is high; although the membrane separation method can remove a variety of pollutants in the wastewater, it usually has problems such as high energy consumption, small treatment capacity, and membrane pollution; the adsorption method is simple to operate and can be used simultaneously. Adsorbs a variety of substances without introducing any other pollutants. It is suitable for treating wastewater with complex types of pollutants. Generally, activated carbon is more commonly used, but traditional activated carbon is more expensive and has higher operating costs.

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