Polyhexamethylene biguanidine used as a new type sewage sludge conditioning agent: Effect on sludge dewaterability and mechanism.

Dewatering is the basic procedure of sludge treatment and disposal, and environmentally friendly and efficient sludge conditioning methods are urgently needed. Polyhexamethylene biguanide (PHMB), a broad-spectrum germicide used in daily life and medicine, was proposed as a sludge conditioning reagent in this paper, and its effect on waste activated sludge (WAS) dewaterability was studied for the first time. Results showed that PHMB can improve sludge dewatering performance, and capillary suction time (CST) and water content (Wc) of dewatered sludge cake was reduced by 78.

Insights into the enhancement of waste activated sludge dewaterability using sodium dichloroisocyanurate and dodecyl dimethyl ammonium chloride: Performance, mechanism, and implication.

Sludge dewatering is essential for reduction of sludge volume to cut the cost of transportation and disposal. Combined application of sodium dichloroisocyanurate (DCCNa) and dodecyl dimethyl ammonium chloride (DDAC) was attempted to promote sludge dewatering performance and physicochemical properties for the first time in this work. The results showed that capillary suction time (CST) and moisture content of dewatered sludge cake (Mc) decreased to 15.