A parametric study of alum recovery from water treatment sludge
- 18 May 2016
- journal article
- Published by IWA Publishing in Water Science & Technology
- Vol. 74 (2), 516-523
- https://doi.org/10.2166/wst.2016.241
Abstract
Alum recovery from water treatment sludge is a promising technique applied to decrease usage of fresh coagulants in water treatment industry. In addition, alum recovery reduces sludge volume to be easy handled. The undertaken work is devoted to investigate the parametric conditions for alum recovery procedure by acidification. The results show that alum recovery percent reached up to 69.03%, and the reduction of sludge volume reaches its highest level at 90%. Moreover, results of the parametric investigation reveal that the mixing time of 60 minutes and mixing intensity of 150 rpm are the optimum conditions of mixing for alum recovery from water treatment sludge. The optimum pH level is 1.50 for alum recovery as indicated by maximum aluminum releasing, maximum reduction of sludge volume, and reasonable dosages of added sulfuric acid.Keywords
This publication has 13 references indexed in Scilit:
- The practical influence of rapid mixing on coagulation in a full-scale water treatment plantWater Science & Technology, 2014
- Utilization of Water Treatment Plant Sludge and Coal Fly Ash in Brick ManufacturingAmerican Journal of Environmental Protection, 2014
- An economic assessment of coagulant recovery from water treatment residualsDesalination, 2011
- Effects of Acidification on Dewaterability and Aluminum Concentration of Alum SludgeSeparation Science and Technology, 2010
- Chapter 28 Beneficial utilization of drinking-water treatment residuals as contaminant-mitigating agentsPublished by Elsevier BV ,2007
- Constructive Approaches Toward Water Treatment Works Sludge Management: An International Review of Beneficial ReusesCritical Reviews in Environmental Science and Technology, 2007
- Acidification and alkalization of textile chemical sludge: volume/solid reduction, dewaterability, and Al(III) recoverySeparation and Purification Technology, 2005
- Selective Coagulant Recovery from Water Treatment Plant Residuals Using Donnan Membrane ProcessEnvironmental Science & Technology, 2003
- Aluminum recovery from water clarifier sludges by ion exchange: Comparison of strong and weak electrolyte cation resins performancesReactive and Functional Polymers, 1998
- A feasibility study of alum recovery in wastewater treatment plantsWater Research, 1988