Research on the impact of dosing method and dosage of PFS flocculant on aerobic sludge granulation

Flocculant dosage can promote the formation of Aerobic granular sludge. In the experiment, the aerobic granular sludge was cultivated in SBR reactor, by changing the dosing method and dosage of coagulant, considering the growth of particle size, SVI, removal rate of organic matter as the evaluation of sludge granulation process indicators to select the appropriate dosing method and dosage of flocculant PFS. The results show that the flocculant was dosed once for all or respectively and trained 8d or 13d when the small particles of sludge will appear. When the dosage was 150mg/L-200mg/L, the removal rate of organic matter and N were the best and the removal rate of COD reached 90%, the removal rate of TN reached 60%.The best dosing methods of PFS flocculant is one-time dosing, and the best dosage range is 150mg/L-200mg/L.