Ultrasonic catalyzed cross-linking-cellulose filter-pressing separation system

Abstract

The invention discloses an ultrasonic catalyzed cross-linking-cellulose filter-pressing separation system which is composed of three parts, namely, a dosing and premixing area, an ultrasonic catalyzed cross-linking reaction area and a filter-pressing tank. According to the system, the characteristic that cellulose can participate a crosslinking reaction in the presence of certain weak acid substances is utilized, citric acid is taken as a cross-linking agent, trisodium citrate is taken as a catalyst, the three materials are added into papermaking wastewater containing a large quantity of natural cellulose, then the mixture is sufficiently mixed, and an anhydride-esterification reaction between citric acid and natural cellulose is carried out under the action of catalytic activation of ultrasonic waves, so that a cellulose gel material having a space chemical cross-linking structure is generated. The cellulose gel material is insoluble in water and has a flocculating property, so that high-concentration COD in the papermaking wastewater can be purified at the same time, and the effect of simultaneously removing cellulose and COD in the papermaking wastewater is realized.

Description

technical field [0001] The invention relates to an ultrasonic catalyzed crosslinking-cellulose filter press separation system, which belongs to the field of waste water 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 ...

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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