Application of EWP high efficiency sewage purifier in papermaking sewage treatment
Abstract: papermaking sewage has large volume, high concentration and poor biodegradability. The traditional biochemical method to treat this kind of papermaking wastewater has the advantages of large investment, high operation cost and low removal rate. The treatment situation in recent years shows that the physicochemical method  is more economical and practical. In some countries, the focus of treatment technology has been shifted to the research and development of physicochemical coagulation method. EWP high-efficiency sewage purifier is an equipment system with only one-stage physicochemical treatment process, which can treat the sewage produced by using waste paper to regenerate paddle material to make another paper, so as to achieve a pollutant removal rate of more than 90% cod; BOD is 70% up and down; SS is more than 95%, and the treated sewage can also be reused in production
1. Experimental research
1.1 equipment principle
papermaking sewage can separate a large amount of sludge after flocculation reaction. These flocculent sludge containing fiber has a good adsorption capacity similar to activated carbon. The previous sedimentation or air flotation process only separates these solids, and does not give full play to the filtration function of these sludge. EWP high-efficiency sewage purifier is to use the flocculated sediment generated after these flocculation reactions to form a stable, continuous and automatic renewal only attached to the Gangdu fluidized bed in the purifier, so that the pollutants play the role of activated carbon, so that the incoming sewage can not only get the solid-liquid separation effect after the ordinary coagulation reaction, but also get the purification treatment of filtration and adsorption, The removal rate can be% higher than that of the ordinary physical and chemical treatment process of air flotation or sedimentation. Because EWP high-efficiency sewage purifier does not use any filter material or filler as the filter bed, it will not be blocked, so it avoids the trouble of backwashing and additional power consumption necessary for sand filter or other filter devices, and solves the blocking problem caused by the drying and hardening of filter materials after the accidental shutdown of the treatment device. EWP high efficiency sewage purifier is a device integrating sewage flocculation reaction, sedimentation, adsorption, filtration, sludge concentration and other functions
2. Engineering application
2.1 treatment scale
in the treatment project of Zhujiang paper mill, two sets of purifiers with a treatment capacity of 100m3/h (13m high) and two sets of 50m3/h (11m high) are used to treat the paddle making and papermaking wastewater of yellow paper and white paper respectively. The people's paper factory adopts six purifiers with a treatment capacity of 100 (15 high) to treat the paddle making and papermaking wastewater of yellow and gray paper. It is equipped with 2 sets of sludge thickening tank and dosing system, sludge scraper of regulating tank, sludge dehydrator and other equipment. The processing capacity of the two projects are 7200 and 15000 respectively, and the total investment is 5.9 million yuan and 9.8 million yuan respectively, disrupting the market order, Covering an area of 1600 (polish off the coating and 2800. Guangzhou No.1 City carton factory applies EWP high-efficiency sewage purifier, and the sewage is reused in papermaking production after treatment, making the factory reach the advanced level of making 1 ton of paper with 1 ton of water.
2.2 process flow
comparative test flow increases the surface quenching hardness to hrc58 (6) 2. It adds equipment such as sludge scraper in the regulating tank, dosing system after the pump, sludge dehydrator, etc.
2.3 operation effect
the technical characteristics of EWP high-efficiency sewage purifier The point is that without any filter materials or fillers, the suspension in the sewage of the advanced production mode is used to purify the continuously entering sewage by forming adsorption filtration with the flocculant precipitate generated after the reaction between the suspension and flocculant. The key is that EWP high-efficiency sewage purifier can form a stable fluidization of flocculated sediment in sewage. Today's pollutants play the role of activated carbon, and the fresh flocculated sediment can promote the discharge of old flocculated sediment, so as to always maintain the treatment effect of the purifier. Although it is only a primary physicochemical treatment process, it can improve the efficiency by% compared with similar processes such as air flotation and sedimentation
after more than three years of operation, although the influent concentration changes greatly, the effluent is still relatively good and stable. The monitoring results in Table 2 show that the achievable COD removal rates are 92.5%, bod78.5% and ss98.9%, meeting the design requirements of the project and national standards. The direct operation cost (reagent cost 0.25 yuan, power consumption 0.2 degrees) is 0.38 yuan/ton of water
the EWP high-efficiency sewage purifier with primary physicochemical treatment process is used to treat the wastewater from papermaking with recycled paddle material. It has the advantages of simple process, reliable equipment, convenient management, low investment, less land occupation, high efficiency, low operation cost, and the treated wastewater can be discharged up to the standard and can be reused