With the development of China's paper industry, the sludge produced by the treatment of papermaking wastewater is also a new pollution. The paper sludge mainly comes from the primary sedimentation tank and the biochemical pool. Most of the paper sludge components are cellulose organic matter and nitrogen and phosphorus. Potassium and other plant nutrients, and contains a certain amount of trace heavy metals and pathogenic bacteria. According to the characteristics of the sludge containing plant nutrients, the sludge can be processed into organic fertilizer. As we all know, the sludge contains a lot of water, so how is the economy? Effectively remove moisture?

In the paper industry, pressure filtration is generally used to remove moisture from the sludge. After the sludge is concentrated and enters the mechanical dewatering process, it is necessary to add the medicament to the sludge for treatment. Due to the different papermaking processes, the dosage of the pesticide is not the same. Usually, the inorganic flocculant is added to the polyaluminum chloride. Ferrous sulfate and organic flocculant PAM, etc. The most commonly used and best effect is the organic flocculant PAM. The cationic PAM is the leader in the PAM family in the treatment of paper sludge, because the floc formed by the cationic PAM is large, and the pressure filtration process produces more water. The moisture content of the mud cake is low, and the moisture content of the mud cake can reach about 75%. This situation facilitates the reprocessing of the mud cake. After getting the mud cake, it is further processed into organic fertilizer to realize turning waste into treasure.