JIAN Shouwei, HUANG Weichao, LI Baodong, GAO Xin, GAO Wenbin, YANG Xin
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In engineering,flocculating materials are usually used to improve the dewatering effect of the sludge.The difference in organic content of sludge leads to different dewatering effects of flocculating materials in different sludges.In this paper,organic sludges with three contents were used as the research object,and four flocculating materials were used for experiments.Based on the settlement column curve,turbidity,SRF,and floc water content,the type and content of flocculation materials that match different organic content of sludge was obtained:for high organic sludge,using CPAM and the best content of 250 mg/L;for medium organic sludge,using PAC and the best dosage of 200 mg/L;for low organic matter sludge,using PFS and the best dosage of 100 mg/L.After matching,the specific filtration resistance of high,medium and low organic sludge was decreased by 46.8%,69.4%,65.4%,and the water content of flocs was decreased by 15.1%,35.9%,and 32.3%.Compared with the original sludge,the dewatering effect was significantly improved.The mechanism of the flocculation material was researched by Zeta potential.The results showed that the high organic content sludge had a high Zeta negative potential,and CPAM with high molecular weight should be used to enhance the adsorption of electricity and adsorption bridging role.In medium and low organic sludge,PAC and PFS greatly promoted the flocculation of sludge,but when the concentration of flocculation material was too large,the flocs was difficult to aggregate into agglomerates.This study had guiding significance for the selection of flocculating material types and dosage in the sludge dewatering process.