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

Yasong Chen

doi:10.4236/jep.2013.412162

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Journal of Environmental Protection > Vol.4 No.12, December 2013

The Effect on Activated Sludge of Chemical Coagulants Applied in Synchronization Dephosphorization ()

Yasong Chen

Beijing Construction Engineering Group (BCEG) Environment Development CO. LTD, Beijing, China..

DOI: 10.4236/jep.2013.412162 PDF HTML 3,562 Downloads 4,931 Views Citations

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.

Keywords

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

Share and Cite:

Y. Chen, "The Effect on Activated Sludge of Chemical Coagulants Applied in Synchronization Dephosphorization," Journal of Environmental Protection, Vol. 4 No. 12, 2013, pp. 1423-1427. doi: 10.4236/jep.2013.412162.

Conflicts of Interest

The authors declare no conflicts of interest.

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