Treatment process for acrylic fiber waste water

Abstract

The invention discloses a treatment process for acrylic fiber waste water. The acrylic fiber waste water is pretreated and then is subjected to first-set electrodialysis separation to obtain organic waste water with low salt content and high-salinity concentrated water containing organic matters with low concentration; the organic waste water with the low salt content is subjected to advanced oxidation treatment to improve the biodegradability, and then is subjected to A / O biological treatment to reach the standard; the high-salinity concentrated water containing the organic matters with the low concentration is subjected to reverse osmosis desalination to obtain purified water and reverse osmosis concentrated water; the purified water is used for production; the reverse osmosis concentrated water is subjected to second-set electrodialysis concentration to produce water. According to the process method provided by the invention, on the basis of an advanced oxidation technology and a biological treatment technology, the degradation of refractory organics and macromolecule organic matters which are difficult to naturally settle is realized relatively fully and effectively by comprehensively utilizing a membrane separation technology; the degraded waste water is recycled; the obtained purified water can be used for production, so the resourceful treatment is really realized.

Description

Technical field: [0001] The invention relates to the field of advanced treatment of wastewater in the chemical industry, in particular to a treatment process for acrylic wastewater. Background technique: [0002] Acrylic fiber is one of the earliest chemical fiber varieties developed in my country. Acrylic fiber products have good bulkiness, good warmth retention, soft hand feeling, good weather resistance, mildew and moth resistance, and have wide applicability. The acrylic fiber is prepared by a method or a wet process, and the waste water produced in the production process is a major problem faced by the world. Acrylic wastewater has a complex composition of pollutants, high toxicity, many oligomers that are difficult to biodegrade, and biological inhibitors such as sulfate and sulfite, which make acrylic wastewater have low biodegradability and high salt content. , it is very difficult to deal with. [0003] At present, the research on the treatment of acrylic fiber w...

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Problems solved by technology

[0004] For example: Chinese invention patent CN201110307877.1 discloses a treatment method for acrylic fiber wastewater, which uses ultrasonic pretreatment of acrylic fiber wastewater to remove oligomers and long-term biodegradable Chain macromolecules are decomposed and degraded to improve biodegradability, and then enter the integrated biological reaction tank for denitrification and carbon removal, and further Fenton process oxidation to remove residual refractory organic matter; this method requires pH adjustment before ultrasonic pretreatment, and Fenton Oxidation has certain requirements on the dosage of oxidants, and the amount of chemical reagents is large and the cost is high

In particular, due to the low treatment effect of advanced oxidation technology in high-salt conditions, the oxidation efficiency of refractory organic matter is very low, resulting in high treatment costs

[0005] Chinese invention patent CN201210172104.1 discloses a biochemical treatment method of acrylic fiber wastewater, which first adjusts the pH of acrylic fiber wastewater to 7-9 and adds Na3PO4, followed by the first-stage A / O treatment and the second-stage A / O treatment. The removal rate of CODCr in wastewater can reach 100%, and the total removal rate of CODCr in wastewater can reach more than 70%, but the reaction process takes a long time, and the activated sludge has low impact load resistance, easy disintegration or swelling, etc. problem, in addition, sludge return requires a lot of power consumption

At the same time, because acrylic fiber wastewater usually contains a high concentration of salinity, in order to improve the efficiency of biochemical treatment in actual operation, a large amount of fresh water needs to be added, which increases the treatment cost

[0006] The particularity and complexity of the components of acrylic fiber wastewater will inevitably make its treatment more difficult. Over the years, researchers have never stopped studying how to improve the biodegradability of acrylic fiber wastewater. However, there has been no breakthrough

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