A treatment method for removing cellulose in papermaking wastewater

Abstract

The invention discloses a treatment method for removing cellulose in papermaking wastewater. The wastewater sequentially passes through a water collecting well, a coarse screen, a primary sedimentation tank, a pH value adjusting tank, an ultrasonic catalytic crosslinking-cellulose filter pressing separation system, an aeration tank, a biological oxidation filter tank, a secondary sedimentation tank and a water purification tank to be treated. The characteristic that cellulose can be subjected to a cross-linking reaction in the presence of some weak acid substances is creatively utilized, citric acid selected as a cross-linking agent and trisodium citrate selected as a catalyst are added into papermaking wastewater containing a large amount of natural cellulose, full mixing is performed, and a cyclic anhydride-esterification reaction on citric acid and natural cellulose under the catalytic activation action of ultrasonic waves to generate a cellulose gel substance with a spatial chemical cross-linked structure. The substance is insoluble in water and has a flocculation characteristic, and the effect of simultaneously removing cellulose and COD in the papermaking wastewater is achieved.

Description

technical field [0001] The invention relates to a treatment method for removing cellulose in papermaking wastewater, which belongs to the field of wastewater treatment in environmental protection. Background technique [0002] The paper industry is a traditional large water user in my country, and it is also one of the important sources of water pollution. At present, my country's paper industry wastewater discharge and COD discharge rank first among all types of industrial emissions, and the paper industry is the most serious pollution to the water environment. the primary issue to be addressed. According to statistics, the discharge of papermaking and paper products industrial wastewater at or above the county level in my country accounts for 18.6% of the total industrial discharge in the country, of which the amount of treated discharge reaching the standard accounts for 49.3% of the total discharge of papermaking industrial wastewater. Papermaking wastewater is produced...

AI Technical Summary

Problems solved by technology

However, this method requires a relatively complicated process flow, and at the same time requires a large equipment investment and floor area, and is not suitable for large-scale promotion and use.

[0010] At present, the existing methods for treating cellulose in papermaking wastewater have problems such as single technical route, unsatisfactory treatment effect, complicated process and equipment, high cost, and easy to cause secondary pollution.

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