Sodium carboxymethyl cellulose production wastewater treatment process

Abstract

The invention discloses a sodium carboxymethyl cellulose production wastewater treatment process. The treatment process comprises a pretreatment section, an anaerobic treatment section, a preliminary precipitation section, a biological oxidation section, a biological precipitation section, a sludge treatment section and a membrane separation section; sodium carboxymethyl cellulose production wastewater, cleaning wastewater and domestic sewage are subjected to process design, and BVR evaporation desalting, anaerobic, preliminary precipitation, biological aerobic, biological precipitation and MBR (Membrane Bioreactor) treatment processes are adopted, so that the operating cost of sewage treatment is greatly reduced; various properties of equipment are thoroughly optimized and tapped, so as to enable the equipment to have a relatively high processing load; the adaptability to the sudden change of water quality and water volume is relatively high; the treatment efficiency of each section is stable, and the overall treatment effect is stable; and after technical treatment, the treated water reaches the sewage takeover standard of a sewage treatment plant, and partial water meets the requirements of enterprises on sewage recycling and then is recycled.

Description

technical field [0001] The invention relates to the technical field of a high-salt, high-COD production wastewater treatment process, in particular to a production wastewater treatment process for sodium carboxymethyl cellulose. Background technique [0002] Sodium carboxymethyl cellulose, referred to as CMC, is a cellulose ether product, a derivative obtained by chemically modifying natural fibers. It can be used as a food additive, flocculant, chelating agent, emulsifier, thickener, etc., widely It is used in food, household chemicals, ceramics, electronics, plastics and other fields; there are nearly 100 CMC manufacturers in China, with an annual output of hundreds of thousands of tons, showing a growing trend with economic development. [0003] The only pollutant produced by the CMC industry is wastewater, which is characterized by high salt and high COD, up to 20,000-40,000mg / L. For every ton of CMC produced, about 2.5-3 tons of waste liquid will be produced. The treat...

AI Technical Summary

Problems solved by technology

For example, Japan adopts the hydrogen peroxide treatment process, and Germany adopts the resin exchange method, but they still have their own shortcomings and fail to achieve zero discharge of surface water.

There is still a big gap in this aspect in our country. Usually, the production process of CMC adopts the solvent method, and washing wastewater is generated during the washing process. The high treatment cost makes it unacceptable for all enterprises at home and abroad. The most common treatment method is to hand over the wastewater to the wastewater treatment company, mix it with other industrial wastewater for further treatment, and the wastewater treatment in the CMC production process urgently needs the innovation of process and technical methods

[0004] The disadvantages of the prior art are as follows: for the high-salt and high-COD wastewater in the production of sodium carboxymethyl cellulose, the operating cost is high, the efficiency is unstable, the biochemical sludge is prone to sludge bulking, and the adaptability to fluctuations in water quality and quantity is extremely high. Low; the load on the treatment equipment is low, the impact resistance is poor, the energy consumption of wastewater treatment is large, and the effects of salt concentration, COD, BOD, and SS indicators after wastewater treatment are not ideal

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