Novel method for treatment of dye wastewater

Abstract

The invention relates to a novel method for treatment of dye wastewater. The dye wastewater belongs to one of industrial wastewater difficult to treat; the existing dye wastewater treatment techniquehas the disadvantages of high energy consumption, high cost and troublesome operation. The novel method is characterized in that a microorganism membrane electrolysis cell is coupled with a microorganism fuel electric cell, the respective characteristics are fully realized, the treatment effect of dye wastewater is improved, and the energy source is saved. The method for treating the dye wastewater comprises the following steps of connecting the microorganism membrane electrolysis cell and the microorganism fuel electric cell in series; leading the to-be-treated dye wastewater into the microorganism membrane electrolysis cell to be primarily degraded, so as to improve the biodegradability; then, leading into the microorganism fuel electric cell to be further degraded, and simultaneously producing electricity. The novel method has the advantages that the dye wastewater treatment effect is good, and the electric energy can be recycled; the energy consumption is low, and the water treatment cost is low; the operation is convenient, and the automatic running effect is realized; the environment is protected, and the novel method is suitable for the development of dyeing enterprises.

Description

technical field [0001] The invention relates to environmental protection technology, in particular to a new method for treating dye wastewater. Background technique [0002] Dye enterprises are chemical enterprises that produce acid dyes, neutral dyes, mordant dyes and dye intermediates. The mixture of mother liquor and washing water produced in the dye production process has become one of the important pollution sources of water body environmental pollution, and its total discharge accounts for about 1 / 10 of the industrial wastewater discharge. Because dye wastewater has high COD, high chroma, high Salt content, low BOD 5 / COD and three causes (teratogenic, carcinogenic, mutagenic) and other characteristics, pose a great hazard to the water environment and human health, so it is recognized as refractory industrial organic wastewater. [0003] Since dye wastewater is mostly based on aromatic hydrocarbons and heterocyclic compounds and has a chromogenic group, the chromogen...

AI Technical Summary

Problems solved by technology

[0007] A. Adsorption by activated carbon adsorbent, the disadvantage is that regeneration is difficult and the cost is too high

[0008] B. Biological activated carbon adsorption method is limited by the concentration of microorganisms. When the concentration of microorganisms is low, the degradation effect is poor; when the concentration of microorganisms is high, the pores of activated carbon are blocked, resulting in poor adsorption effect.

[0009] C. Microporous resin adsorption, limited adsorption capacity, cannot meet the treatment requirements of dye wastewater, and after the adsorbent is saturated, it is easy to form secondary pollution

[0010] (3) Electrochemical and membrane analysis methods: such as electro-oxidation technology, photo-oxidation technology, microwave synergy technology, electric floatation and micro-electrolysis, etc. Although these methods have the advantages of good treatment effect, no secondary pollution, and small footprint , but its disadvantage is that it consumes a lot of energy, and it is easy to scale and block the dye wastewater with high salt content, which increases the treatment cost

[0011] (4) Biological treatment method: The cost of biological treatment method is low, but in the case of high salt content, the degradation effect is affected due to the unsatisfactory effect of strain domestication

[0012] Chinese Patent Publication No.: CN 201310670975 (preliminary research results of our research group), which introduces "a new process for combined advanced oxidation technology and biofilm method to treat dye wastewater". Although the effluent of this process can reach the target after treatment, this The method has high energy consumption, long processing time and high processing cost

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