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In the process of Quantitative Microbial Risk Analysis prescribed by the Dutch DrinkingWater Decree, quantitative information about the elimination capacity of water treatment isnecessary. Site specific data can be collected by monitoring the removal of surrogates likebacteriophages, indicator bacteria and spores. Spores of sulfite-reducing clostridia may serve assurrogate for persistent protozoan (oo)cysts. But this is not possible for all locations or processes.Alternative strategies are pilot plant studies or literature reviewing. In this paper, the latterhas been explored for conventional treatment. A standard method was developed to evaluatequantitative data from literature and applied to establish the Microbial Elimination Capacity (MEC)of conventional treatment and the individual processes, coagulation/floc-removal and rapidgranular filtration. With these results, QMRA can be performed for sites with no or debatablequantitative data on micro-organism removal by site specific processes. Further studies arenecessary to develop a standard method to include the observed variation of MEC in the calculationof the uncertainty level of the infection risk level assessed in the QMRA-process. Includes 25 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 11File Size: 1 file , 270 KB