Comprehensive treatment method for high-salt high-COD wastewater

Abstract

The invention relates to a comprehensive treatment method for high-salt high-COD wastewater. The method comprises the following steps that (1) wastewater enters an adjustment tank through a grid, thepH is adjusted, effluent of the adjustment tank enters a coagulating sedimentation tank, and a flocculant is added for coagulating sedimentation; (2) effluent of the coagulating sedimentation tank enters an ultrasonic electrocatalysis oxidation device for treatment; (3) effluent of the ultrasonic electrocatalysis oxidation device enters an electrodialysis device for treatment; (4) through electrodialysis desalination, fresh water enters an ABR anaerobic baffle plate reactor for treatment; (5) effluent of the ABR anaerobic baffle plate reactor enters a BSBR reactor, and a salt-tolerance microorganism reinforcement salt-containing wastewater is added to the BSBR reactor for biochemical treatment; (6) effluent of the BSBR reactor enters an ozone reaction device for treatment; (7) ozone effluent passes through an adsorption filtering device and is reused or discharged at last. The method has the advantages that the technology is reliable and high in stability, the rate of removing pollutants is high, and the water quality of the effluent stably reaches the standard, and the method is suitable for comprehensive treatment of the high-salt high-COD wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a comprehensive treatment method for high-salt and high-COD wastewater. Background technique [0002] In the process of chemical industry, dyestuff, printing and dyeing, papermaking and other industries, a large amount of wastewater with high salt content and high COD will be discharged. Due to the salt content of this type of wastewater is as high as 1-25%, the COD is as high as 5000-100000mg / L, or even more High, and the wastewater composition is complex, or highly toxic, directly discharged into natural water will cause immeasurable damage to the environment, and directly into the commonly used biochemical system for treatment, will have a huge impact on the biochemical system, affecting the quality of the effluent water, causing Microorganisms die. Some enterprises adopt the method of diluting biochemical treatment. This method often needs to consume...

AI Technical Summary

Problems solved by technology

The traditional biochemical methods mainly include activated sludge method and biofilm method, but they have a good treatment effect on low-concentration organic wastewater, but multi-stage series connection is required to achieve better treatment effect on high-concentration organic wastewater that is difficult to degrade. The process is long, the impact load is relatively poor, and the processing function is limited to a certain extent

In addition, the concentration of salt ions in the wastewater is very high, which directly affects the stability of the osmotic pressure in the microbial cells of the wastewater biochemical treatment system, which can easily cause the cytoplasmic wall to separate and die, severely inhibit the growth of microorganisms, and lead to a significant reduction in the effect of biochemical treatment

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