Co-conditioning of the anaerobic digested sludge of a municipal wastewater treatment plant with alum sludge: benefit of phosphorus reduction in reject water

Water Environment Research : a Research Publication of the Water Environment Federation
Y YangP Kearney

Abstract

In this study, alum sludge was introduced to co-conditioning and dewatering with an anaerobic digested sludge from a municipal wastewater treatment plant, to examine the role of the alum sludge in improving the dewaterbility of the mixed sludge and also in immobilizing phosphorus in the reject water. Experiments have demonstrated that the optimal mix ratio for the two sludges is 2:1 (anaerobic digested sludge:alum sludge: volume basis), and this can bring approximately 99% phosphorus reduction in the reject water through the adsorption of phosphorus by alum in the sludge. The phosphorus loading in wastewater treatment plants is itself derived from the recycling of reject water during the wastewater treatment process. Consequently, this co-conditioning and dewatering strategy can achieve a significant reduction in phosphorus loading in wastewater treatment plants. In addition, the use of the alum sludge has been shown to beneficially enhance the dewaterability of the resultant mixed sludge, by decreasing both the specific resistance to filtration and the capillary suction time. This is attributed to the alum sludge acting in charge neutralization and/or as adsorbent for phosphate in the aqueous phase of the sludge. Experiments h...Continue Reading

References

Oct 11, 2003·Journal of Environmental Quality·J A IppolitoE F Redente
Jun 30, 2005·Environmental Science & Technology·Konstantinos C MakrisHerschel A Elliott
Nov 8, 2006·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Y YangY Q Zhao

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Citations

Apr 15, 2011·Journal of Environmental Quality·J A IppolitoH A Elliott
Feb 16, 2020·Environmental Science and Pollution Research International·Baiming RenAnge Nzihou

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