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Which type of polyacrylamide is more advantageous in dewater
DateTime:2019-06-26 15:15Click:
With the development of China's paper industry, the sludge produced by the treatment of paper-making wastewater is also a new pollution. Paper-making sludge mainly comes from primary sedimentation tank and biochemical tank. Most of the components of paper-making sludge are cellulosic organic matter and plant nutrients such as nitrogen, phosphorus and potassium, and contain a certain amount of trace heavy metals and pathogenic bacteria because, according to the characteristics of sludge containing plant nutrients, it can be Sludge is processed into organic fertilizer. As you know, sludge contains a lot of water. How to remove water economically and effectively?   In paper industry, pressure filtration is usually used to remove water from sludge. Sludge after concentration, before entering mechanical dewatering, it needs to be treated by adding chemicals to the sludge. Because of different papermaking processes, the chemicals are different. Usually, inorganic flocculants such as polyaluminium chloride, ferrous sulfate and organic flocculants such as polyacrylamide are added. Organic flocculant polyacrylamide is the most commonly used and has the best effect. Cationic polyacrylamide is the best one in the family of Polyacrylamide in the treatment of paper-making sludge. Because of the large flocs formed by using cationic polyacrylamide, more water is produced in the filtration process, the water content of the pressed mud cake is low, and the water content of the mud cake can reach about 75%. This situation facilitates the re-location of the mud cake. Li. The mud cake is further treated and processed into organic fertilizer to turn waste into treasure.
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