Treatment method for textile industrial waste water

Abstract

The invention discloses a treatment method for textile industrial waste water. The treatment method for textile industrial waste water comprises the following steps: (1) regulating a pH value; (2) carrying out coagulation air floatation treatment on the waste water obtained in step (1); (3) carrying out primary oxygen deficit / primary aerobiotic biological treatment on the waste water obtained by treatment in step (2); (4) carrying out secondary oxygen deficit / secondary aerobiotic biological treatment on the waste water obtained by treatment in step (3); (5) carrying out reverse osmosis treatment on nano-filtration produced water obtained by treatment in step (5), and enabling reverse osmosis concentrated water to enter a primary anoxic pond; (7) carrying out DTRO disc tube type reverse osmosis treatment on nano-filtration concentrated water obtained by treatment of step (5); and (8) carrying out evaporation treatment on the DTRO disc tube type reverse osmosis concentrated water obtained by treatment in step (7). By the method, the problem of dispersed treatment of salt in the waste water is solved, the treatment efficiency and effect are improved, the treatment cost is reduced, andzero emission of treatment of the waste water is further implemented.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for textile industrial wastewater. Background technique [0002] The textile industry has a large amount of wastewater discharge, deep color, high content of refractory organic matter, and unstable water quality, which are the focus and difficulty of wastewater treatment industry research. Pollutants in textile industrial wastewater are mainly dirt, salt, oil and grease on textile fibers such as cotton and wool, as well as various sizing, dyes, surfactants, auxiliaries, acids and alkalis added during processing. etc. These are serious sources of pollution. At present, the treatment methods of textile industry wastewater include physical, chemical and biological methods. Because this type of wastewater contains a large amount of organic matter, dyes, pigments, and toxic substances that are not easy to biodegrade or have a very slow bio...

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Problems solved by technology

[0035] In the printing and dyeing wastewater treatment method and system of the invention, since the nanofiltration concentrated water is processed by the nanofiltration concentrated water treatment unit and then returned to the nanofiltration unit for processing, it will inevitably cause the infinite accumulation of salt here, and the salt Accumulation in the same position has buried hidden dangers for the long-term stable operation of the equipment. On the one hand, the infinite accumulation of salt will inevitably cause frequent shutdowns and replacement of equipment, which will affect the continuous treatment of wastewater, and frequent disassembly of equipment will also Cause artificial depreciation and wear of equipment, and increase operating costs in disguise; on the other hand, salt accumulation in the same place, when it exceeds a certain amount, will inevitably have a negative impact on subsequent treatment processes. Second, the reduction in processing efficiency

At the same time, this treatment method and system requires large equipment investment, low treatment efficiency, and high treatment cost. It is difficult to implement on a large scale, and it has not fully realized zero discharge of wastewater, which is not enough to meet actual needs.

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