Process for treating coking waste water containing phenol and cyanogen by physical chemistry method and special device therefor

Abstract

The invention discloses a treatment technology and special equipment of carbonizing phenolic cyanogen waste water by physicochemical method, belonging to the processing technique of waste-water or sewage water, especially the waste-water multistep treatment technique which containing one chemical processing step at least. The technological process of this treatment technology is: air-float de-oiling-ferrum coagulate desulfuration and decyanation-coke adsorption filtration desorption floating precipitate-desorption and stripping NH3-N-ozone oxidation stripping hydroxybenzene and organic matter, the dealed waste-water used as make-up water of coke quenching and coal washing. The treatment technology and special equipment of carbonizing phenolic cyanogen waste water by physicochemical method of this invention has fewer invest and fine dealing effect than traditional treatment scheme, the available resources of waste-water such as tar, ammonia and so on can be reclaimed and utilized effectively, the dealed waste-water is used to coke quenching to reach the dealed waste-water and discharged, the coke quenching discharged gaseous effluent pollutant can reach criterion, not only is the same with waste water disposal of new coke-oven plant, but also is used to the technical betterment of quondam coke-oven factory's waste water disposal system.

Description

Technical field [0001] The invention belongs to the treatment technology of water, waste water or sewage, especially the multi-stage treatment technology of waste water with at least one chemical treatment step. Background technique [0002] Coking wastewater is high-concentration organic wastewater generated during coal coking, gas purification and coking product processing. Its composition is complex, containing a large amount of phenols, sulfides, cyanides and NH 3 -N and other organic and inorganic pollutants, the pollutants have high chroma, and are high-concentration organic industrial wastewater that is difficult to biodegrade. Therefore, the treatment of coking wastewater has always been a major problem in the field of wastewater treatment at home and abroad. At present, the technologies for treating coking wastewater mainly include three categories: physical-chemical method, biochemical method and physical-chemical-biochemical method. Among them, the physicochemi...

AI Technical Summary

Problems solved by technology

Use ammonia distillation and "MAP method" to remove ammonia nitrogen in coking wastewater. After preliminary ammonia distillation of coking wastewater, add Mg 2+ (magnesium salt) and PO 4 3- (Phosphate), reacts with ammonia nitrogen in wastewater to generate MgNH 4 PO 4 .6H 2 O (magnesium ammonium phosphate, Magnesium Ammonium Phosphate, namely MAP) is precipitated and removed by filtration, and a strong base is added to the coking wastewater to convert phenol into phenoxide to reduce toxicity. The phenoxide exists in the coking wastewater and is reused in sintering, Steelmaking and coking ammonia washing and other links, under the action of high temperature in these links, phenoxides can be decomposed into CO 2 and water, add soda ash, iron salt and other decyanation agents to the coking wastewater to convert cyanide into Na 4 Fe(CN) 6 Add aluminum salt or iron salt inorganic flocculant and organic polymer flocculant (such as polyacrylamide), and adjust the amount and ratio of the two, and the treated coking wastewater will be reused as production water for converter dust removal, Coking ammonia washing, sintering and other internal systems, this technology has achieved the treatment of coking wastewater, but the magnesium ammonium phosphate and Na 2 Fe(CN) 6 The high solubility may have the defect of not reaching the standard after treatment, and at the same time, the ammonia distillation consumes a lot of energy

Images