polyferric sulfate – pfs – polyaluminium chloride(pac) in italy

polyferric sulfate – pfs – polyaluminium chloride(pac) in italy
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  • Do poly aluminum chloride and poly ferric sulfate affect was digestion?
  • Poly aluminum chloride (PAC) and poly ferric sulfate (PFS) are widely used in wastewater treatment and sludge dewatering, resulting in their amounts being accumulated substantially in waste activated sludge (WAS). Till now, however, little information about their influence on WAS digestion is available.
  • How Pac and pfs affect sludge flocs?
  • It was observed that both PAC and PFS benefited sludge flocs aggregates and formed a bigger sludge particle and caused a higher AAE. It was also founded that the existence of PAC and PFS obviously depressed the bioprocess of hydrolysis, acidiogenesis, and methanogenesis.
  • Why does PFS inhibit methane production more severe than Pac?
  • So, in PFS reactor, hydrogen might be served as substrate to produce acetate or hydrogen sulfide but not methane, which is one of the reasons that PFS inhibits methane production more severe than PAC.
  • Is PFS sludge a coagulant?
  • There are some studies reported that Fe-based flocculants are more effective coagulant for the removal of phytoplankton, turbidity, DOC, TSS, color, COD, and oil from wastewaters, so, it would be reasonable that sludge particle size of PFS sludge was larger than PAC sludge ( Wang et al., 2002 ).