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Water treatment

Visscher, J.T. and

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WHO, (1993) Guidelines for Drinking-Water Quality. Recommendations: WHO, World Health Organisation, Geneva, SW. pp. 1-188 WHO, (1996) Guidelines for Drinking-Water Quality: Health Criteria and other Supporting Information. WHO, World Health Organisation, Geneva, SW. WHO, (1997) Guidelines for Drinking-Water Quality. Surveillance and Control of Community Supplies: WHO, World Health Organisation, Geneva, SW. pp. 1-238 Williams, J. (1828) A Historical Account of Sub-ways in the British Metropolis for the Flow of Pure Water and Gas, Including the Projects in 1824 and 1825. London, U.K. Windle-Taylor, E. (1974) 45 th Report on Results of Bacteriological, Chemical and Biological Examination of London's Water for the Year 1971 - 1973. Metropolitan Water Board. London, U.K. Winer, B.J. (1962) Statistical Principies in Experimental Design: McGraw-Hill Book Company, Inc. USA. Wolman, A. (1981) Prologue: In The Quest for Pure Water, ed. by MJ Taras; AWWA: Denver, pp. viixvii Wolters, H. (1988) Roughing Filtration: a literature study: M.Sc. Thesis. Delft University of Technology and IRC, International Water and Sanitation Center. The Hague, The Netherlands. Wolters, H., Smet, J.E.M., and Galvis, G. (1989) Upflow Filtration. In Pre-treatment Methods for Community Water Supply. An overview of techniques and present experience. ed. by JEM Smet and Visscher, J.T. IRC, International Water and Sanitation Centre. The Hague, The Netherlands. pp. 109- 125 Wolters, H., Smet, J.E.M., and Pardon, M.O. (1989) Downflow Filtration. In Pre-treatment Methods for Community Water Supply. An overview of techniques and present experience. ed. by JEM Smet and Visscher, J.T. IRC, International Water and Sanitation Centre. The Hague, The Netherlands. pp. 93- 107 Woodward and Ta, C.T. (1988) Developments in Modelling Slow Sand Filtration: In Slow Sand Filtration, ed. by NJD Graham; Ellis Horwood Ltd. England, pp. 349-366 WRC. (1977) Water Purification in the EEC: Pergamon Press, New York, USA. Yao, K.M., Habibian, M.T., and O'Melia, C.R. (1971) Water and Wastewater Filtration: Concepts and Applications: In Environmental Science and Technology.pp. 1105 Yepes, G. (1990) Análisis de Mínimo Costo: ACODAL, v. 144, Bogotá, Colombia. 228