JEP  Vol.4 No.12 , December 2013
The Effect on Activated Sludge of Chemical Coagulants Applied in Synchronization Dephosphorization
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.
Cite this paper: 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.

[1]   C. L. Zhao, M. M. Zhang, W. L. Ma, et al., “Effect of Aluminum Flocculant on Microbe in Activated Sludge,” Environmental Engineering, Vol. 18, No. 5, 2000, pp. 28-31.

[2]   J.-H. Pan, C.-T. Jin and W.-Z. Wang, “Study on Aluminum Toxicity and Tolerance Mechanisms of Microorganisms,” Acta Microbiologica Sinica, Vol. 44, No. 5, 2004, pp. 698-702.

[3]   M. Hideahi, “Cell Biology of Aluminum Toxicity and Tolerance in Higher Plants,” International Review of Cytology—A Survey of Cell Biology, Vol. 200, 2000, pp. 1-46.

[4]   L. L. Bao, Q. F. Cheng, D. Li, et al., “Silicon-Based Microfabricated Microbial Fuel Cell Toxicity Sensor,” Water & Wastewater Engineering, Vol. 36, No. 3, 2010, pp. 144-147.

[5]   V. K. Leon, “Cellular Mechanisms of Aluminum Toxicity and Resistance in Plants,” Annual Review of Plant Physiology and Plant Molecular Biology, Vol. 46, 1995, pp. 237-260.