Treatment process of phenol-acetone industrial wastewater

Abstract

The invention discloses a treatment process of phenol-acetone industrial wastewater. The treatment process sequentially comprises pretreatment, biochemical treatment and chemical oxidation post-treatment; wherein the pretreatment step comprises the following steps: heating the phenol-acetone wastewater to 90-100 DEG C by using a preheater, enabling the heated wastewater to enter a molecular mill,dispersing the wastewater into small liquids one by one, then carrying out flash steam stripping, introducing steam into the molecular mill through the bottom, and carrying out secondary steam stripping; sequentially carrying out first-effect evaporation, second-effect evaporation, third-effect evaporation and fourth-effect evaporation crystallization on obtained pre-stripped wastewater, and continuously carrying out biochemical treatment and chemical oxidation post-treatment on evaporated liquid. According to the treatment process of phenol-acetone industrial wastewater, aiming at the water quality characteristics of the phenol-acetone wastewater, a treatment scheme combining physical desalination, biochemical treatment and chemical oxidation post-treatment is adopted, the process is simple, the operation is convenient, zero emission of sewage is realized, no toxic or harmful by-product is generated in the treatment process, no pollution is caused, and extremely high economic benefitsand environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a treatment process for phenol-acetone industrial wastewater. Background technique [0002] As a basic chemical raw material, phenol has developed rapidly in China in recent years. Before 2000, the national phenol production capacity was about 250,000 tons per year. Up to now, the domestic phenol production capacity has exceeded the million mark, and the production capacity is still under planning. There are nearly a million tons. With the development of the domestic phenol market, the pressure on environmental protection will gradually emerge in the future. [0003] As one of industrial wastewater, phenol acetone wastewater has a wide range of sources and is extremely harmful to environmental pollution. [0004] big. As a widely used chemical raw material, phenolic organic compounds are very common by-products in the production process of chemical...

AI Technical Summary

Problems solved by technology

[0007] The Chinese patent application number is CN201710531165.5, which discloses an industrial wastewater treatment process, including precipitation treatment, sedimentation separation, electrolytic treatment, chlorine dioxide treatment, anaerobic treatment, etc., combining traditional chlorine dioxide treatment with ozone oxidation and biological treatment The technology can effectively treat the difficult biodegradable macromolecular organic substances in industrial wastewater, which can improve the biodegradability of wastewater. However, phenol acetone industrial wastewater has the characteristics of small flow, high salt, high COD, and low pH value, and its applicability is not strong.