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Guidelines on using the Wastewater Treatment Technology Selection Decision Support Tool (W2DST)
Expanded Title:The most commonly used wastewater treatment technologies in South Africa include activated sludge, bio/trickling filters, rotating biological reactors, wastewater ponds, membrane bio-reactors, wetlands and aerobic granular activated sludge (e.g. Nereda, an emerging technology). There are various aspects to consider in selecting the appropriate wastewater treatment technology. Selection of wastewater treatment technology is in many instances influenced by effluent quality standards. However, operations, maintenance, sludge management, financial issues and day to day running of the institution also need to be considered amongst others. There is, therefore, a need for guidance in selecting an appropriate wastewater treatment technology. The process of selection of a preferred technology should be guided by the particular circumstances, including design, operations, maintenance and institutional resources. By way of example, in many instances wastewater pond systems are being either upgraded to conventional systems and/or in some cases being de-commissioned. Due to the fact that they do not meet effluent standards. This failure to meet effluent standards may be due to poor management of these systems, as reported (de Souza and Jack, 2010), and not because of inappropriateness of the technology. This indicates the need to come up with guiding criteria incorporating all relevant variables influencing selection of appropriate wastewater treatment technologies. The purpose of this study is to provide guidance to decision makers on selecting the most appropriate wastewater treatment technology for their particular circumstance. In this regard, the guide provides, inter alia, a summary of wastewater treatment works status in South Africa, highlights key aspects to be considered when choosing an appropriate wastewater treatment technology, and provides step-by-step guidance on how to use the decision support tool for wastewater treatment technology selection which is hosted on RiskQ (www.riskq.co.za). This guide is intended for use by the following people or groups: • Managers of wastewater services within a WSI • Water quality managers • Councillors • Wastewater treatment works designers, e.g. consultants • Project Management Unit managers • Department of Water and Sanitation officials • Other water sector stakeholders including South African Local Government Association (SALGA) and Department of Cooperative Governance and Traditional Affairs (CoGTA) • Water resources managers • Any person responsible for wastewater services status
Date Published:01/08/2016
Document Type:Research Report
Document Subjects:Wastewater Management - Domestic
Document Keywords:Technology
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 675/16
ISBN No:978-1-4312-0804-3
Authors:Jack U; De Souza P; Moorgas S
Project No:K5/7023
Originator:WRC
Document Size:3 459 KB
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