Pretreatment and Recovery Method of Ammonia Nitrogen in Acrylic Fiber Wastewater

A recovery method, ammonia nitrogen recovery technology, applied in textile industry wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory biochemical effects, impact of biochemical treatment, system collapse, etc., and achieve good results Socio-economic benefits, reduced processing costs, and convenient operation

Inactive Publication Date: 2011-12-07
CHINA UNIV OF MINING & TECH (BEIJING)
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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 bioch

Method used

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  • Pretreatment and Recovery Method of Ammonia Nitrogen in Acrylic Fiber Wastewater
  • Pretreatment and Recovery Method of Ammonia Nitrogen in Acrylic Fiber Wastewater
  • Pretreatment and Recovery Method of Ammonia Nitrogen in Acrylic Fiber Wastewater

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[0029] The test took the high ammonia nitrogen wastewater produced in the dimethylacetamide (DMCA) production section of the wet acrylic fiber production process of a chemical fiber factory in Jilin as the research object. The ammonia nitrogen content was 975.36-1030.07mg / L, the phosphorus content was not detected, and the COD was 208.51 ~216.43mg / L.

[0030] Such as figure 1 As shown, it is a schematic flow diagram of the system, including struvite crystallization steps, struvite pyrolysis regeneration and ammonia nitrogen recovery steps, recycling steps after regeneration, etc.

[0031] Struvite crystal formation steps:

[0032] First analyze the ammonia nitrogen concentration of the waste water in the waste water storage tank 1, calculate the magnesium source and the phosphorus source amount that need to set up, then pass through the acid solution (10%H 2 SO 4 ) pool 6 and lye pool (10% NaOH) 7 to adjust the pH value of wastewater to 10.25-10.75.

[0033] After adjustin...

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/52C01B25/45C02F101/16C02F103/30
Inventor 张春晖何绪文林辉李冬
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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