Novel process for reclaiming waste water containing CN- and NH3 or NH4-

Abstract

The invention relates to a method for separating HCN and NH3 for reclamation or realizing standardized discharge from wastewater solution that contains CN<-> and NH3 or NH4<+>, particularly relates to a new technique of resource cyclic utilization of high-salt cyanide and ammonium bearing wastewater, which is represented by cyanuric chloride industry, thus opening a new way of resource cyclic utilization of the high-salt cyanide and ammonium bearing wastewater, which is represented by cyanuric chloride, and providing a totally new clean production technology with simple technique, investment-saving and low operation fee and resource cyclic used feature of the integrated utilization of wastewater that contains the CN<-> and NH3 or NH4<+>.

Description

technical field [0001] The present invention relates to a kind of from containing CN - and NH 3 or NH 4 + Separation and recovery of HCN and NH from wastewater solution 3 The method of post-reuse or up-to-standard discharge, especially involving high-salt CN - and NH 3 or NH 4 + A new technology for resource recycling of waste water. Background technique [0002] After nearly 20 years of development, China's cyanuric chloride industry has begun to take shape, and has formed a production capacity of 60,000-80,000 tons per year. However, because the traditional sodium cyanide method is used for production, there are problems such as long process flow, high material consumption, and a large amount of high-concentration sodium chloride wastewater containing impurities such as ammonium, cyanide, and sodium formate. Due to the high concentration of sodium chloride, it is difficult to treat the wastewater by biodegradation process, and it is also difficult to remove the am...

AI Technical Summary

Problems solved by technology

Its disadvantages are: when the cyanide concentration is high, the consumption of chemical reagents is large, and the operating cost is high

The disadvantage is: H 2 o 2 More expensive, higher processing costs

The ion exchange method has low investment, simple process and convenient operation. However, the regeneration of the resin is difficult. If the ammonia is blown off and regenerated, it will be released into the atmosphere and cause secondary pollution. If the ammonia blown out is absorbed by water, the dilute ammonia water obtained It cannot be reused and has no export value

[0008] In summary, for the CN - and NH 3 or NH 4 + For wastewater, the existing single treatment technology has various deficiencies in the separate treatment, or it can only deal with the CN in the wastewater. - or NH 3 / NH 4 + , or the consumption of chemical reagents is large, and the energy consumption is high

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