Kinetics and capacities of phosphorus sorption to tertiary stage wastewater alum solids, and process implications for achieving low-level phosphorus effluents

Water Research
Chris MaherKrishna Pagilla

Abstract

The role of adsorption and/or complexation in removal of reactive or unreactive effluent phosphorus by already formed chemical precipitates or complexes has been investigated. Potential operational efficiency gains resulting from age of chemically precipitated tertiary alum sludge and the recycle of sludge to the process stream was undertaken at the Iowa Hill Water Reclamation Facility which employs the DensaDeg(®) process (IDI, Richmond, VA) for tertiary chemical P removal to achieve a filtered final effluent total phosphorus concentration of <30 μg/L. The effect of sludge solids age was found to be insignificant over the solids retention time (SRT) of 2-8 days, indicating that the solids were unaffected by the aging effects of decreasing porosity and surface acidity. The bulk of solids inventory was retained in the clarifier blanket, providing no advantage in P removal from increased solids inventory at higher SRTs. When solids recycle was redirected from the traditional location of the flocculation reactor to a point just prior to chemical addition in the chemical mixing reactor, lower effluent soluble P concentrations at lower molar doses of aluminum were achieved. At laboratory scale, the "spent" or "waste" chemical alum s...Continue Reading

References

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Citations

Aug 26, 2018·Environmental Science and Pollution Research International·Ruiru ZhangZhongcheng Pan
Sep 11, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·T FundneiderS Lackner
Oct 28, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Marlena Cristina MoneaAsya Drenkova-Tuhtan

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