The printing and dyeing industry will produce a large amount of printing and dyeing wastewater in the production process, Sludge dewatering machine Its main characteristics are large amount of water, high content of organic pollutants, deep color, high alkalinity, large changes in water quality, and complex process. The conditioning of printing and dyeing wastewater and the treatment of the corresponding printing and dyeing sludge have always been a problem.
Conventional printing and dyeing waste water treatment In the process, air flotation is the most common method. In order to improve the removal rate of polluted particles in wastewater, ferrous sulfate, polyacrylamide, etc. are generally added to increase the diameter of particles and their specific gravity difference with water. The sludge produced by this process has a high moisture content, about 94-97%. After absorbing bubbles and moisture, the sludge volume expands, and the sludge has high organic content and viscosity.
In traditional Dewatering of printing and dyeing sludge The plate and frame filter press is mostly used in the process. Because of the high viscosity and fine particle size of printing and dyeing air flotation sludge, the filter cloth of the plate and frame filter press will be blocked in a short period of time, the water outlet speed will be slow, and the filtering period will be prolonged. According to the survey of some customers in the printing and dyeing industry in Shaoxing by Dazhang Filter Equipment Co., Ltd., a unloading period of 8-16 hours, low filtration efficiency and high moisture content of filter cake have seriously affected the subsequent transportation and treatment of printing and dyeing sludge.
In view of the current situation of printing and dyeing sludge treatment, after repeated analysis, research, design and improvement, Dazhang's technicians developed a new type of all stainless steel belt type thickening and dewatering machine, which was successfully applied to sludge dewatering in the printing and dyeing industry, and achieved very good results. Belt filter press is a new, efficient and fully automatic Sludge dewatering equipment 。 It is composed of stainless steel frame, integrated sludge mixing tank, centrifugal rotary hub thickener, gravity dewatering section, pressing section, mud rake, driving device, filter belt cleaning device, filter belt tensioning device, filter belt tracking and correction system, filtrate collection tray and drainage tray, internal wires and pipes, etc. The machine frame, roller and liquid receiving tray are made of 304 stainless steel, wear-resistant and corrosion resistant, Ensure that the equipment operates stably for a long time. Its working principle is: the sewage to be treated reacts with the configured flocculant in the sludge mixing tank to produce flocculated sludge, and then enters the centrifugal hub thickener for pre dehydration. The high concentration flocculated sludge mass after thickening and dewatering through the rotary hub enters the gravity dewatering area, wedge dewatering area and roller shearing press for further dewatering. The finally dried sludge is scraped off by the upper and lower scrapers and enters the sludge storage device. The filter belt is cleaned and regenerated by the online cleaning system before recycling. The whole equipment realizes continuous water inflow and sludge production, and the operation process is completely automatic.
We have carried out equipment commissioning, and through field calculation, a belt filter press with a bandwidth of 2m can treat 15-20m3 of sewage per hour, the sludge output is 1-3 tons/H, and the sludge moisture content is reduced from 98% to 78-80%, reaching the indicators specified by the environmental protection department. The sludge output per hour of a 2m belt filter is 3-5 times that of the original 200 ㎡ plate and frame filter press, which greatly improves the sludge treatment efficiency and greatly reduces the labor intensity of on-site workers, and is highly praised by customers. Thank you for reading the above article, Horizontal screw centrifuge We have a lot of knowledge, but Zhengda will not introduce them here. If you are interested in our products, please call us. The company can provide different production plans according to the needs of customers, and wholeheartedly provide the most high-quality products and services for users.
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