Combination technique for processing and recycling high-cyanogen high-ammonia high-salt organic waste water

Abstract

The invention relates to a combined technique of treating and reusing the organic sewage which is rich in cyanogen, ammonia and salt, and adopts the combined techniques of acidified decyanation (with the sodium cyanide recollected), basified ammonia blowing (with ammonium salt recollected), oxidation by adding chlorine, biological treatment, precipitation and clarification, deep oxidation, biological active carbon filtering, one-time brine refining, microstraining film, and other combined techniques, and then the chlorine alkali is produced after the secondary brine refining in the chlorine alkali industry and the entrance into the ionic membrane electrobath. The combined technique can be used for treating the industrial sewage in the tricyanogen chloride, chlorine alkali, gold mine, galvanization and other industries and conduct recovery of the resources, thereby overcoming the disadvantages that the prior art has narrow applicability and treatment function and disappointing treatment result, cannot recollect the resources, and has high treatment cost and unobvious economical benefit. The combination of the technique is scientific and reasonable, the technique is novel, unique and mature, the treatment is good, and the combined technique has a plurality of functions, strong applicability, wide use range and remarkable environmental and economical benefit.

Description

technical field [0001] The invention relates to a combined process for the treatment and resource recovery of industrial wastewater containing high cyanide, high ammonia nitrogen, high salt, and high organic matter concentration, such as the treatment and resource recovery of industrial wastewater in chemical industries such as cyanuric chloride and chlor-alkali. Background technique [0002] The production process wastewater of cyanuric chloride, the water quality is bad, COD: 1500~3500mg / L, total cyanide (in CN - Total) content is 200~800mg / L, ammonia nitrogen (NH 3 -N) content is 400~1000mg / L, sodium formate (HCOONa): 3500~4200mg / L, total organic carbon (TOC): 500~1500mg / L, sodium chloride (NaCl): 18%~20%. This kind of industrial wastewater with high concentration of sodium chloride, organic matter, ammonia nitrogen and highly toxic cyanide must be treated up to the standard, and resources (such as sodium chloride, ammonia water, sodium cyanide, etc.) should be recovered...

AI Technical Summary

Problems solved by technology

However, this process can only remove organic matter such as TOC (low removal rate), and has no function of removing cyanide, ammonia nitrogen and metal ions; the catalyst is not a general material, and its production, supply, and regeneration are complicated

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