The Bioavailable Phosphorus (BAP) Fraction in Effluent from Advanced Secondary and Tertiary Treatment

作者: Michael T Brett , Bo Li

DOI: 10.2166/9781780405551

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摘要: Due to the widespread severity of eutrophication in surface waters, there is a strong impetus require ultra-low effluent phosphorus (P) concentrations (i.e., <100 μg L−1) many municipal water resource recovery facility (WRRF) discharges. Chemical addition, with filtration or membrane separation, commonly used meet these low targets and therefore most P from tertiary removal soluble phase. This study examined bioavailability (BAP) effluents advanced treatment systems using algal bioassay experiments. Effluent BAP was determined for 17 full-scale facilities representing wide range technologies, including enhanced biological chemical coagulant addition secondary processes. The samples operationally characterized as particulate dissolved, reactive nonreactive characterization. A standard determine both total fractions. operational fractions were then statistically compared concentrations. nutrient technologies tested included alum ferric based removal, (EBPR), single- two-stage treatment, separation processes. The results this suggest that (TRP) concentration has, characterizations team assessed, strongest statistical association (r2 = 0.81) an average TRP ratio 0.61 ± 0.24. work should encourage quality modelers maximum daily load (TMDL) permit writers consider importance when assessing likely ecological impacts discharges facilities. These also indicate species composition varies process cases large portion (>50%) recalcitrant growth. Comparisons between different higher doses, which achieved lower concentrations, decreased fraction bioavailable (BAP%). research variety well-defined containing compounds. clearly showed defined classification scheme classic methods problematic. Algal uptake experiments high bioavailability, some organic species, are unlikely persist natural waters because their kinetics very rapid. Finally, further compounds, such humic-metal-P complexes, phytic acid, and/or apatite may be dominant components dissolved pool identified other studies. This title belongs WERF Research Report Series ISBN: 9781780405551 (eBook)

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