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Development of Sustainable Approaches to Achieving Low Phosphorus Effluents
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In an increasing number of wastewater treatment facilities there is a push towards ever lowereffluent phosphorous limits. In order to meet low effluent P concentrations, chemical phosphorusremoval is the preferred option for reliable and consistent performance. However, since highmolar ratios of Metal/P are required for driving phosphorus to very low levels, large quantities ofchemicals are required. These chemicals are costly and have their own environmental impact thatis rarely considered when low effluent phosphorous limits are set. Biological phosphorusremoval can achieve effluent ortho-P concentrations of less than 0.1 mg/L, but in order to meetvery low levels consistently, chemicals are required for standby, for precipitation of residualortho-phosphorus and for coagulation of the remaining particulate and colloidal phosphorus.Some facilities have investigated the synergy of biological and chemical phosphorus removal,whereby chemicals can be added as a polishing stage or in conjunction with biologicalphosphorus removal. This paper will discuss proposals and implications of Water EnvironmentResearch Foundation (WERF) Study: Development of Sustainable Approaches to Achieving LowPhosphorus Effluents which will look at available information and research needs to determine theoptimal and synergistic use of a combination of both processes to reduce the chemical cost whilestill allowing the recovery of phosphorus from the plant.
low phosphorusChemical/biological treatment
James Barnard、Sudhir Murthy、Christine deBarbadillo
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Black & Veatch, 8400 Ward Parkway, Kansas City, MO 64114 Email: barnardjl@bv.com
DCWater, Blue Plaines, Washington DC
Black & Veatch, 8400 Ward Parkway, Kansas City, MO 64114
WEFTEC 2011;Annual Water Environment Federation technical exhibition and conference
Los Angeles, CA(US)
84th annual Water Environment Federation technical exhibition and conference
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