Method and system for recycling waste water by combining spark generation plasma with multistage membrane technology

Abstract

The invention discloses a waste water reuse method and system of spark discharge plasma cooperative multi-stage membrane technology. 1) Based on thyratron switching power supply and pin-plate spark discharge plasma generator, spark discharge is used to generate plasma to modify ultrafiltration membrane and reverse osmosis membrane; 2) Adsorption by activated carbon in plug flow reactor 3) Control the conductivity of the wastewater to be treated by controlling the dosage of organic loads to ensure wastewater treatment in the spark discharge mode; 4) Use spark discharge plasma technology to contain ozone in the Under oxygen conditions, pulse discharge produces plasma, activated carbon, and ultraviolet radiation to treat wastewater; 5) Utilize ultrafiltration / reverse osmosis double-membrane technology to cooperate with plasma technology to treat wastewater. The invention has a turbidity removal rate of over 99%, a conductivity removal rate of over 99%, a COD removal rate of over 97%, and a BOD removal rate of over 96% for various types of printing and dyeing wastewater, and the degree of membrane pollution is minimized.

Description

technical field [0001] The invention relates to a wastewater reuse method and system of a spark discharge plasma cooperative multi-stage membrane technology, and belongs to the field of wastewater treatment. Background technique [0002] With the rapid development of the dye industry, its production wastewater has become one of the most important sources of water pollution, and its water quality presents high chroma, high concentration, high COD and BOD values. Printing and dyeing wastewater accounts for about 30% of the total wastewater discharge of enterprises. Once printing and dyeing wastewater is discharged into the wastewater treatment system of the enterprise, the wastewater treatment effect will be reduced, and the difficulty and cost of treatment will increase. [0003] Reverse osmosis technology has many advantages such as low equipment investment, low energy consumption, and short construction period. Using RO technology to reuse wastewater as an indirect drinking...

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Problems solved by technology

[0003] Reverse osmosis technology has many advantages such as low equipment investment, low energy consumption, and short construction period. Using RO technology to reuse wastewater as an indirect drinking water source is of far-reaching significance, but membrane fouling has always been the bottleneck restricting the wide application of this technology. At present, there are no effective measures to reduce membrane fouling.

[0004] The application of ozone to treat wastewater is also a commonly used option, but there are at least two key problems to be solved: the first is that the energy consumption of ozone is high, and the yield is low, which increases the cost of operation; the second is the solubility of ozone in water. low, not efficiently utilized and overflow

[0005] Finally, single plasma technology, biofilm technology or advanced oxidation technology has a limited range of treatment. Combining various technologies not only needs to overcome the above-mentioned various technical problems, but also requires cross-field experience and knowledge

Therefore, there is still a lack of a coordinated combination system that can effectively reduce various wastewater discharge indicators at the same time.

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