Disposal process for fully standardized discharge of highly nondegradable organic wastewater

Abstract

The invention relates to a wastewater disposal process, in particular to a disposal process for fully standardized discharge of highly nondegradable organic wastewater. The disposal process comprisesthe following steps that the highly nondegradable organic wastewater is subjected to high-efficiency biochemical treatment and then subjected to adsorption with macroporous resin, and standard tail water is discharged after the adsorption; the macroporous resin is eluted with a desorption agent, an obtained eluent is subjected to a wet oxidation reaction for wet oxidation degradation, most of nondegradable organic matter is completely degraded, a small part of the nondegradable organic matter is decomposed into organic matter wastewater which can be subjected to biochemical treatment easily, the high-efficiency biochemical treatment and the macroporous resin adsorption are carried out again, and the steps above are repeated circularly until fully standardized discharge of all the organic wastewater is realized. The disposal process can effectively realize the complete degradation of the highly nondegradable organic matter.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a treatment process for discharging highly refractory organic waste water up to the standard. Background technique [0002] The treatment of highly difficult organic waste water is a difficult problem in the domestic and foreign sewage treatment industry. "Refractory" means that the biodegradability of this type of waste water is low, and BOD 5 The / COD value is generally less than 0.3 or even lower, and it is difficult to biodegrade. The COD of the biochemical effluent is still 1000mg / L~30000mg / L, and the organic matter causing this situation is polycyclic aromatic hydrocarbons, heterocyclic and long-chain alkanes or both Nitrogen, oxygen, sulfur heterocyclic compounds, oil, ammonia nitrogen and other toxic and harmful substances. Typical industries such as petrochemical, coal chemical, printing and dyeing, pharmaceutical, chemical, light industry, and pesticide often produce ...

AI Technical Summary

Problems solved by technology

The traditional activated sludge method and anaerobic process can effectively decompose organic matter in the treatment of refractory organic wastewater, but in actual engineering, it is found that anaerobic process is difficult to treat some organic matter, and it occupies a large area, takes a long time to process, and has low processing load. , and the effluent COD is difficult to reach the standard

Among the physical and chemical methods, the coagulation sedimentation method has a good effect in removing refractory organic pollutants and wastewater chroma, but this method mainly transfers pollutants in water to flocs and sludge, and has not achieved complete degradation, and will still cause great harm to the environment

Advanced oxidation methods include Fenton method, photocatalytic oxidation method, wet oxidation method, ozone oxidation method, etc., which have the advantages of high chemical reaction efficiency, good pollutant degradation effect, and small footprint. The disadvantage is that the treatment cost is high, and some The process is easy to cause secondary pollution, such as the Fenton process produces a large amount of sludge

Among them, the reason for the high treatment cost of the wet oxidation method is that the concentration of organic matter is low, and the heat generated by oxidation is not enough to maintain the heat required by the process, requiring a large amount of external heat supply

Membrane separation technology can efficiently separate pollutants in water, such as particulate matter, macromolecular organic matter and salt in water, and is currently the most commonly used technical means for sewage treatment at home and abroad. However, membrane separation method only concentrates pollutants and cannot achieve the digestion of pollutants.

The patent with the application number CN201610309671.5 proposes "a difficult organic wastewater treatment process technology", which adopts anaerobic and aerobic biochemical treatment and then uses MBR membrane to filter, but this process cannot completely digest pollutants, and most organic matter is still concentrated inside the MBR membrane

Images