Improving dehydration property of elutriation sludge by CPAM and modified coal fly ash

摘要

This article studied the dehydration effect of elutriation sludge produced in the process of cultivating aerobic granular sludge, which is a joint regulation of cationic polyacrylamide (CPAM) and modified coal fly ash, using sludge specific resistance(SRF) and moisture content of sludge extent as the target. The results show that the greater the relative molecular weight, the better effect is. CPAM whose relative molecular weight is 8 million is the best type when solo casted. When casted by 15 mg/L, SRF is reduced to 0.43 ×10~8 S~2/g, The 1 g/L coal fly ash and 15 mg/L 8 million CPAM joint control, SRF is reduced to 0.4×l0~8 S~2/g, moisture content is 72.04%. When using modified coal fly ash, the result is better. Modified coal fly ash can effectively promote the efficiency of CPAM as the coagulant aid. It can further reduce SRF and moisture content of the sludge. We can observe the effects modified coal fly ash joint CPAM has on elutriation sludge morphology by scanning electron microscopy (SEM).