Treatment technology for acrylic fibers waste water by dry process

Abstract

A process for treating the sewage generated by preparing acrylic fibre by dry method includes such steps as regulating pH value, coagulation-deposition to remove suspended substance and colloid, cooling supernatant, flowing in conditioning pool, active mud-microeletrolyzing stemp while providing oxygen to the active mud, anaerobic acidifying while introducing life sewage for removing EDTA and Na salt, and anaerobic-aerobic step for biologic denitrifying. Its advantages are high effect and easy operation.

Description

technical field [0001] The invention belongs to the category of multistage treatment of industrial waste water, and in particular relates to a dry acrylic fiber waste water treatment process. Background technique [0002] At present, there are five sets of dry-process acrylic fiber production devices of the same type in the country. They are Fushun Petrochemical Company Acrylic Fiber Factory, Zhejiang Jinyong Acrylic Fiber Factory, Qinhuangdao Acrylic Fiber Factory, Maoming City Acrylic Fiber Factory and Qilu Petrochemical Company Acrylic Fiber Factory. The waste water treatment process of these five acrylic fiber factories was also designed by the Design Institute of the Ministry of Textile Industry of China, using anaerobic-aerobic-biological activated carbon treatment process. [0003] Taking the acrylic fiber plant of Qilu Petrochemical Company as an example, the wastewater in its sewage treatment plant mainly comes from acrylic fiber process wastewater, domestic sewage,...

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Problems solved by technology

[0006] (1) High, high impact of oligomers, high molecular weight of oligomers, difficult to be degraded by microorganisms, and oligomers have strong adhesion, wrapping the soft fillers of anaerobic and aerobic tanks, so that microorganisms The membrane is destroyed, and the treatment efficiency of the sewage treatment plant drops sharply;

[0007] (2) Adverse effects of sulfate on anaerobic Sulfate-reducing bacteria and methanogens produce matrix competition, which reduces the ability of microorganisms to degrade organic matter, forming an impact on anaerobic treatment;

[0009] (4) System defects Due to defects in the anaerobic system (such as water distribution, etc.), the anaerobic system does not play its unique role;

[0010] (5) Sludge return problem

The ammonia nitrogen problem was not considered in the initial design of the sewage treatment plant, and the sludge from the secondary sedimentation tank was returned to the anaerobic tank, which could not guarantee the sludge residence time in the aerobic tank, so that the system lost the ability to remove ammonia nitrogen;

[0011] (6) The problem of accident pool and adjustment pool

The ability of the current regulating pool to regulate water quality is weak, and because there is no accident pool in the initial design, the operation of the entire biochemical system is unstable;

[0012] (7) Cleaning and diversion of sewage is not considered. Domestic sewage has good biochemical properties. After entering anaerobic tank, it increases the hydraulic load of the anaerobic tank on the one hand, and reduces the degradation of refractory biodegradable substances on the other hand;

For this reason, the original process flow has been optimized, and a patent has been applied for the research on the treatment of acrylic wastewater by adopting the air flotation-AB process-sulfate reduction-biological desulfurization-methanogenic three-phase series-anoxic-aerobic process. 00129461.X; Although this process can meet the national first-level emission standards, it has disadvantages such as long process route, harsh control conditions for sulfate reduction and methane production in the anaerobic section, high corrosiveness of biological desulfurization, and difficulties in industrial implementation.

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