AWWA WQTC64097

AWWA WQTC64097 Integral Optimization of Drinking Water Treatment Plants
Conference Proceeding by American Water Works Association, 11/01/2006

van der Helm, A.W.C.; Rietveld, L.C.; van der Aa, L.T.J.; van Kijk, J.C.

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In order to perform an integral optimization for operation of a drinking water treatment plant, explicitobjectives for optimization have to be identified and defined for operational control. This paper discusses what these objectives should be with respect to water quality, environmental impactand costs. Therefore integral assessments are performed for the drinking water production plantWeesperkarspel of Waternet (formerly Amsterdam Water Supply). It is concluded that theobjectives for integral optimization of drinking water treatment plants should be water quality andcosts. The management should decide upon the relative weight between water quality and costskeeping in mind that the greatest threat for drinking water companies in The Netherlands is the useof bottled water for drinking, when tap water quality cannot be guaranteed for that purpose orclients do not trust the tap water quality. Therefore, emphasis must be laid on maintaining the highdrinking water quality. The environmental impact should not be an objective for operationaloptimization of drinking water treatment plants because the environmental impact is relatively lowand will in general benefit from optimization of cost and from good manufacturing practice, forinstance the use of 100% green energy. Assuming that disinfection and removal of suspendedsolids and particles are sufficient, the water quality parameters for integral optimization are SI forchemical stability, AOC and/or biodegradable DOC and DOC for biological stability and disinfectionbyproducts and organic micro-pollutants for toxicity. Since the SI, AOC, DOC and pathogenconcentration are influenced by many processes and influence many processes an integralapproach of these parameters is necessary. Because of the complexity of the relations and effectson these parameters by changes in the operational control, different control strategies can best beevaluated by an integral model. Includes 23 references, tables, figures.