Pickle wastewater resourceful treatment method

Abstract

The invention provides a pickle wastewater resourceful treatment method which comprises the following steps: sending pickle wastewater to a multi-stage membrane filtration system, and intercepting large-particle suspended solids and small-particle suspended solids in the pickle wastewater in a stepped manner; conveying the pickle wastewater subjected to multi-stage membrane filtration treatment to a sterilization system so that a large number of microorganisms are prevented from breeding in the pickle wastewater; sending the sterilized pickle wastewater to a membrane concentration desalination system to produce strong brine and desalted water; reusing the strong brine subjected to membrane concentration desalination treatment for the pickle pickling process, and conveying the desalted water to a biochemical treatment system and discharging after being treated to reach the standard. According to the pickle wastewater resourceful treatment method, sodium chloride can be effectively recycled, microbial reproduction is reduced in a multi-stage membrane filtration and sterilization mode, the membrane pollution problem is effectively solved, the food industry safety problem caused by addition of chemical agents is avoided, and resourceful treatment of sodium chloride in pickle wastewater is achieved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for resourceful treatment of pickle waste water. Background technique [0002] With the increasingly stringent requirements for environmental protection, the sewage discharge standard puts forward requirements for the concentration of chloride discharge. Among them, the first-level standard of the Sichuan Provincial Sewage Discharge Standard (DB51 / 190-93) requires chloride to be less than 300 mg / L, and the environmental quality of surface water The third standard of the standard requires that the chloride is less than 250 mg / L, and the treatment of high-salt organic wastewater has become a difficult point in the field of environmental protection. In the domestic agricultural and sideline food processing industry, the pickling industry has developed rapidly in recent years, but the high-salt pickling process leads to the production of a large amount of high-...

AI Technical Summary

Problems solved by technology

[0005] 3) The concentration of suspended solids is high, and there will be residues of plants in the pickling process of mustard mustard;

Zhao Fang and others studied coagulation pretreatment and membrane treatment respectively, among which polyaluminum ferric chloride (PAFC) dosage of 600mg / L and polyacrylamide (PAM) dosage of 90mg / L were used for coagulation pretreatment , the removal rates of COD, NH3-N and TP are 82.1%, 33.3% and 95.1% respectively, but the addition of flocculant will increase the cost of chemicals and equipment. In the treatment process of microfiltration membrane, ultrafiltration membrane and reverse osmosis membrane, the treatment effects of microfiltration membrane, ultrafiltration membrane and reverse osmosis membrane were studied respectively, but there was a problem of membrane fouling in the process of membrane treatment; Phosphorus-hydrolytic acidification-contact anaerobic-CASS process, the removal rates of COD and ammonia nitrogen can reach 95.2% and 97.2% respectively. Yu Gang and others use aerobic granular sludge, and the removal rates of COD, ammonia nitrogen and total nitrogen can reach respectively 95.2%, 95.3% and 72.9%, but the salt content of the wastewater in the process fails to meet the discharge requirements, and the salt cannot be recycled

Chen Honglin and others used flocculation pretreatment and electrodialysis to recover the salt in the wastewater. However, in the actual operation process, it was found that due to the rich nutrients in mustard wastewater, microorganisms were easy to breed during the treatment process, which easily caused membrane fouling.

In summary, the membrane treatment process can avoid the addition of chemical agents, and at the same time can effectively recover sodium chloride and realize the reuse of kimchi wastewater, but the problem of membrane pollution needs to be solved urgently

Images