Treatment method of high-salinity organic wastewater

Abstract

The invention relates to a treatment method of high-salinity organic wastewater, and belongs to the field of wastewater treatment. The problem of wastewater containing high salinity and high organic matters is mainly solved, and the method adopts a combined way of resin adsorption, multi-effect or MVR evaporation and biochemical treatment to carry out the wastewater treatment, so that the removal rate of salt and the removal rate of COD both reach 99.5% or more; by adopting resin adsorption, effective components in the wastewater can be recycled to a great extent, and meanwhile, the contents of organic matters in the salt can be reduced, and the subsequent biochemical cost also can be reduced; by evaporation desalination, the salt content in the wastewater can be reduced to ensure that the wastewater can be subjected to biochemical treatment; a continuous treatment way can be adopted, and the method has a flow process, is easy to operate, is convenient to maintain, is large in treatment capacity, and is suitable for being popularized and applied.

Description

technical field [0001] The invention relates to the technical field of fine chemical wastewater treatment, and more specifically, relates to a treatment method for high-salt organic wastewater. Background technique [0002] In modern fine chemical production, a large amount of high-salt wastewater is often produced. The COD of this wastewater is as high as 20,000 mg / L, the salinity is 8%-15%, and the pH is strong acid or alkaline. Due to the ratio of BOD to COD It is very low, and cannot be treated by traditional biochemical methods or cannot meet the emission standards after treatment. High salt will dehydrate microbial cells and cause cell protoplasm separation, resulting in inhibition and toxicity. At the same time, it will increase the density of wastewater, causing activated sludge to float and lose, seriously affecting the effect of biochemical treatment. The treatment of high salinity and organic matter wastewater has long been a difficult problem to solve. At presen...

AI Technical Summary

Problems solved by technology

[0002] In modern fine chemical production, a large amount of high-salt wastewater is often produced. The COD of this wastewater is as high as 20,000 mg / L, the salinity is 8%-15%, and the pH is strong acid or alkaline. Due to the ratio of BOD to COD Very low, cannot be treated by traditional biochemical methods or cannot reach emission standards after treatment

High salt will dehydrate microbial cells and cause cell protoplasm separation, resulting in inhibition and toxicity. At the same time, it will increase the density of wastewater, causing activated sludge to float and lose, which seriously affects the effect of biochemical treatment.

The treatment of high salinity and organic matter wastewater has long been a difficult problem to solve. At present, there are many methods for the treatment of saline wastewater, such as biochemical degradation, ion exchange, electrolysis, evaporation, membrane method, etc., but due to the existence of these technologies Various defects make it difficult to meet processing requirements

The patent application number ZL201210111678.8 discloses a method for zero discharge of high-salt wastewater, which uses two-stage evaporation to achieve zero discharge of high-salt wastewater, and the removal rate of salts reaches more than 99.5%, but this method Unable to remove organic matter in wastewater, it will still cause great harm to the environment

And the patent number is 201210017318.1 discloses a kind of high-salt wastewater treatment method, the wastewater is electrolyzed and then filtered, and 1g-8g of polyferric sulfate and 0.3g-3g of polyaluminium chloride are added to each liter of filtrate, after stirring evenly, Filtration can meet emission standards, but electrolytic treatment often requires expensive equipment investment, cannot work continuously, and is difficult to apply to large factories