Acrylic fiber waste water treatment method

Abstract

An acrylic fiber waste water treatment method. An acrylic fiber waste water treatment method is provided which comprises the following steps: (a) performing ultrasonic hydrolysis treatment of acrylic fiber waste water; (b) treating the acrylic fiber waste water treated by ultrasonic hydrolysis in step (a) in a biological reaction tank; and (c) performing Fenton treatment of the acrylic fiber waste water obtained in step (b). Through ultrasonic hydrolysis pretreatment of the acrylic fiber waste water, oligomers and long-chain macromolecules which are difficult to bio-degrade in the waste water are decomposed and degraded; the COD index of the waste water is decreased obviously; and the biodegradability is improved. Effluent from ultrasonic hydrolysis flows into the integrated biological reaction tank for biological reactions such as denitrification and decarbonization so as to remove most COD and ammonia nitrogen. Effluent from the integrated biological reaction tank is subjected to the Fenton process to remove residual organic matter difficult to degrade so as to ensure the effluent quality.

Description

technical field [0001] The invention relates to a method for treating acrylic fiber wastewater, in particular to a method for treating acrylic fiber wastewater including ultrasonic hydrolysis. Background technique [0002] Acrylic fiber wastewater is a kind of high-concentration organic wastewater, which contains a variety of pollutants, especially low-molecular polymers, so it pollutes the environment and is difficult to treat, which seriously hinders the development of acrylic fiber industry. Acrylic fiber wastewater treatment is one of the key points of petrochemical pollution control and control. [0003] Due to the introduction of organic additives and high oligomer content in the production process of acrylic fiber, the biodegradability of acrylic fiber wastewater is extremely poor, and BOD 5 The / COD value is between 0.1 and 0.2, which has the characteristics of "three highs and one low" of high pollutant concentration, high N / C, high toxicity and low B / C. The resea...

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Problems solved by technology

[0009] (1) In the existing pressurized hydrolysis-biochemical treatment method, the hydrolysis process with alkali has little effect on oligomers, and oligomers are difficult to remove by biochemical methods, and cause acid-base pollution and ammonia nitrogen pollution problems

[0010] (2) Coagulation-sedimentation, coagulation-air flotation and other processes are used as pretreatment processes, and the BOD of the effluent 5 The / COD value is low, and the biodegradability is still very poor, resulting in the subsequent biochemical treatment, it is difficult to meet the sewage discharge standards; the transfer of pollutants, through coagulation-sedimentation, coagulation-air flotation, magnetic resin adsorption and other methods The oligomers in the wastewater are separated from them in the form of mud cakes, and the toxic and harmful substances in the wastewater are transferred from the liquid phase to the solid phase, resulting in secondary pollution and polluting the environment

[0011] (3) In the existing multi-stage anaerobic and aerobic treatment routes, the pollutants in the acrylic wastewater will inhibit anaerobic organisms, and the high molecular weight and low polymers are difficult to be biodegraded, and the low polymers have great Strong adhesion, wrapping the fillers of the anaerobic tank and the aerobic tank, destroying the microbial film, resulting in a sharp drop in the treatment efficiency of the sewage treatment plant

[0012] (4) The traditional biochemical treatment process (for example, A / O treatment process, etc.) has a long treatment process, a large area, a large investment, and high treatment costs

[0013] (5) The issue of ammonia nitrogen is not considered comprehensive enough to ensure the normal progress of nitrification and denitrification reactions, making it difficult for the effluent to reach the standard. In addition to the high content of COD, the content of ammonia nitrogen in the effluent is relatively high

[0014] Therefore, the current domestic industrially applied technologies for treating acrylic wastewater cannot achieve ideal results, and it is difficult to reduce the COD in acrylic wastewater to below 250mg / L, and there are many defects in the process of technical application

It is difficult for any single treatment method to achieve a high treatment effect. Two or more reasonable and effective combination processes have become the direction of research and exploration, so as to finally improve the effluent quality of acrylic fiber wastewater by giving full play to the advantages of various methods. the goal of

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