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Sustainable Agricultural Use of Municipal Wastewater Sludge
Expanded Title:The project focused on laboratory and field studies as well as simulations to optimize the beneficial use of wastewater sludges from both industrial and domestic origins. It resulted in two reports: 1) Sustainable Agricultural Use of Municipal Wastewater Sludge: Matching Nutrient Supply and Demand, and; 2) The potential of sludge amended combustion coal ash residues as artificial plant growth media. The 1st report focuses on the beneficial utilization of sludge in agricultural practices and details the quantification of responsible sludge application rates in an attempt to match nutrient supply from sludge to actual crop uptake for sustainable agricultural use. It also reports on the development of a mechanistic crop water balance model (SWB) to which N routines were added to provide a reasoning support tool to this end. The P fertilizer value of several sludges, and N mineralisation as influenced by sludge stability and water potential, are also investigated and reported on. The results critically appraise some of the recommendations of Volume 2 (2006) and 4 (2009) of the South African Sludge guidelines and also highlights the potential for P accumulation even at relatively low application rates. The 2nd report focuses on the potential use of petro-chemically derived biological sludge in the vegetation of the large gasification ash dumps. It includes a laboratory column study in which weathering, elemental release and water holding characteristics of co-disposed industrial sludge, fine and gasification mixtures are investigated to assess chemical and physical suitability as potential growing media for plants. The report highlights the benefits and risks of mixing various waste streams in certain ratios, as well as the expected end products as these mixes weather over time.
Date Published:09/04/2012
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial
Document Keywords:Municipality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1724/1/12
ISBN No:978-1-4312-0246-1
ISBN Set No:978-1-4312-0248-5
Authors:Tesfamariam EH; Annandale JG; De Jager PC; Mbakwe I ; van der Merwe P; Nobela L; van der Laan M
Project No:K5/1724
Organizations:Department of Plant Production & Soil Science University of Pretoria
Document Size:3 719 KB
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