Pretreatment and Recovery Method of Ammonia Nitrogen in Acrylic Fiber Wastewater

Abstract

The invention discloses a method for pretreatment and recovery of ammonia nitrogen in acrylic fiber wastewater, which uses struvite to remove ammonia nitrogen in the wastewater produced in the dimethylacetamide (DMCA) production section of the wet acrylic fiber production process, including struvite Steps for generating fecal lite crystallization, struvite pyrolysis regeneration and ammonia nitrogen recovery steps, recycling steps after regeneration, etc. It has the characteristics of simple process, convenient operation, no influence of climate, high ammonia nitrogen removal rate, and can recover ammonia nitrogen resources, and the generated struvite can be used as fertilizer, which has good social and economic benefits.

Description

technical field [0001] The invention relates to a treatment method for high ammonia nitrogen wastewater, in particular to a method for pretreatment and recovery of ammonia nitrogen in acrylic fiber wastewater. Background technique [0002] The acrylic fiber plant is mainly composed of polymerization, spinning, recycling and public works. In the wet acrylic fiber production process, the high ammonia nitrogen wastewater generated in the dimethylacetamide (DMCA) production section has a high content of ammonia nitrogen, often as high as thousands of milligrams per unit. Although its wastewater output is not large, if it is directly discharged into the adjustment tank without pretreatment, it will have a serious impact on the subsequent biochemical treatment, resulting in unsatisfactory biochemical effects and even system collapse; its COD is relatively low, C / N Severe imbalance, only about 0.2, which is far from the normal requirement of 10-20, and cannot be directly treated by...

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Problems solved by technology

[0002] The acrylic fiber plant is mainly composed of polymerization, spinning, recycling and public works. In the wet acrylic fiber production process, the high ammonia nitrogen wastewater generated in the dimethylacetamide (DMCA) production section has a high content of ammonia nitrogen, often as high as thousands of milligrams per unit. Although its wastewater output is not large, if it is directly discharged into the adjustment tank without pretreatment, it will have a serious impact on the subsequent biochemical treatment, resulting in unsatisfactory biochemical effects and even system collapse; its COD is relatively low, C / N Severe imbalance, only about 0.2, which is far from the normal requirement of 10-20, and cannot be directly treated by biochemical treatment

[0003] Among the existing technologies, there is no chemical pretreatment method specifically aimed at the high ammonia nitrogen wastewater produced in the dimethylacetamide (DMCA) production section of the wet-process acrylic fiber production process

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