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has been cited by the following article:

• TITLE: The Effect on Activated Sludge of Chemical Coagulants Applied in Synchronization Dephosphorization

  AUTHORS: Yasong Chen

  KEYWORDS: Synchronization Dephosphorization; Chemical Coagulants; Oxygen Uptake Rate (OUR); Activated Sludge

  JOURNAL NAME: Journal of Environmental Protection, Vol.4 No.12, December 12, 2013

  ABSTRACT: Combined with the practical experience of wastewater treatment plant, the chemical coagulants have inhibition effects on microorganism activity, with the influence degree of PAC (polyaluminium chloride) > AlCl3> Fe2(SO4)3. In synchronization dephosphorization, the inhibition rates of PAC in 10 ppm and 20 ppm are 11.9% and 33% respectively; while the inhibition rates of AlCl3 and Fe2(SO4)3 in 20 ppm are 15.8% and 8.5% respectively, compared with 9.6% and 5.4% in 10 ppm. Backwash wastewater from sand filter after adding coagulants has no direct inhibition effect on microorganism, but it results in inorganic components increase in active sludge. By taking North STP as an example, the VSS/SS ratio reduced from 0.65 after coagulants application to 0.54.