Method for treatment of high-salinity and high-concentration organic wastewater through process of high-efficiency photocatalytic vacuum separation of gas phase, liquid phase and solid phase

Abstract

The invention relates to a method for treatment of high-salinity and high-concentration organic wastewater (wherein salts can be NH4Cl, MgCl2, MgSO4, NaCl, Na2SO4, Na2HPO4 and the like) through a series of processes comprising pretreatment, pH adjustment, high-efficiency photocatalytic separation of gas phase, liquid phase and solid phase and advanced treatment. When the invention is used, the effluent quality can meet the requirements of secondary discharge standards of the category of petroleum and chemical in the Integrated Wastewater Discharge Standard (GB8978-1996), and salt can be recycled from wastewater. In addition, in order to avoid secondary pollution, the invention realizes the photocatalytic treatment of exhaust generated by the high-efficiency photocatalytic separation of the gas phase, the liquid phase and the solid phase, and most of the organic substances in the exhaust can be degraded to remove odor. Moreover, the invention proposes the view of treating waste with waste, namely, feeding the exhaust generated by wastewater into raw wastewater or other kinds of raw wastewater, thereby reducing the exhaust emission and further lowering the difficulty in photocatalytic treatment of the exhaust. The invention has the advantages of low cost, high efficiency, easy operation and no secondary pollution, and is applicable to the treatment of high-salinity and high-concentration organic wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to the treatment of high-salt, high-concentration organic waste water and its tail gas by a photocatalytic vacuum air-liquid-solid three-phase high-efficiency separation process. Background technique [0002] With the rapid growth of my country's economy, the number of chemical and pharmaceutical companies has increased, and their products will produce a large amount of high-salt, high-concentration organic wastewater in the production process. These wastewater have complex chemical components, high salt content, and high organic concentration. It is difficult to use It is difficult to obtain satisfactory results by using traditional wastewater treatment technology for direct biochemical treatment. Therefore, the purification treatment of this kind of wastewater is one of the hot spots in the field of environmental protection research. [0003] In view of the hig...

AI Technical Summary

Problems solved by technology

This method mentions the utilization of salts, but in addition to useful salts, the concentrated solution also contains a large amount of impurities, which makes recovery more troublesome

Among the published patents, an invention patent—catalytic oxidation biochemical combination process for treating highly toxic, high-concentration, high-salt organic wastewater (publication number: CN 101314510A), proposes to apply three-effect vacuum distillation technology to wastewater treatment technology The organic combination with the follow-up catalytic oxidation technology and biological treatment technology has a good treatment effect, but the follow-up treatment is more complicated due to the poor quality of the effluent after vacuum distillation; another invention patent that our research group has disclosed—— A treatment process suitable for high-salt and high-concentration organic wastewater (publication number: CN 101381190), proposed a treatment process of oxidation-vacuum concentration crystallization-oxidation, and achieved good results, but there are many treatment processes, and the investment cost will be reduced accordingly. Increase