Method and system for secondary bio-chemical outlet water treatment and recycling of vitamin C

Abstract

The invention discloses a method and system for secondary bio-chemical outlet water treatment and recycling of vitamin C, and belongs to the field of wastewater treatment. The method disclosed by the invention comprises two parts including a pretreatment unit and a film treatment unit, namely, sand filtration, ozone disinfection, activated charcoal adsorption, cation resin exchange and security filtration are taken as the pretreatment unit, and nanofiltration, primary reverse osmosis and secondary reverse osmosis are taken as the treatment unit, so as to remove soluble organic matter and inorganic acid in waste water. The system provided by the invention comprises a raw water pool, a sand filtration tower, an ozone disinfection tower, an activated carbon filter, a cation resin exchange pillar, a security filter, a first intermediate water tank, a second intermediate water tank and a clean water tank and further comprises a nanofiltration device, a primary reverse osmosis device and a secondary reverse osmosis device, wherein all the components are connected with one another. The invention has the advantage that the amount of water produced by each section of the process can be adjusted according to the requirements on the quality and amount of water used for different proposes, so that recycling of waste water of vitamin C can be realized, and the manufacturing cost of vitaminC can be reduced.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method and a system for treating and reusing vitamin C secondary biochemical effluent. Background technique [0002] Vitamin C fermentation wastewater treatment and reuse technology is an important technology related to the development prospect of vitamin C pharmaceutical industry, and it is an effective way to reduce environmental pollution and solve the problem of water shortage. [0003] Vitamin C (Vitamin C, referred to as vitamin C) is the most widely used vitamin variety with the largest production and sales volume at home and abroad, and China has concentrated most of the vitamin C production enterprises in the world. A large amount of wastewater is discharged during the production of vitamins. The quality of wastewater has the characteristics of high COD concentration, difficult biodegradation, high chroma and difficult biochemical removal, and high salt content. Most v...

AI Technical Summary

Problems solved by technology

However, the content of organic matter in the secondary biochemical effluent of vitamin C wastewater is high, and the COD is as high as 300mg / L. If the membrane treatment is carried out directly without pretreatment, it will easily cause membrane pollution, and even directly lead to the paralysis of the membrane treatment system.

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