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Ndiba PK. Performance of crushed coconut shell as coarse media in dual media filters .; 1993. Abstract

Filtration accounts for a substantial portion of water treatment cost. The dual media filter, by operating at a higher filtration rate than the conventional rapid sand filter, can reduce the cost of filtration considerably. However, use of the dual media filter in Kenya is limited by lack of suitable material for use as coarse media. In this study, pilot plant filtration tests have been carried out to investigate the performance of crushed coconut shell as coarse media in dual media filters. Filtration rate, size of crushed coconut shell, relative depth of media and backwash requirements have been investigated. A dual media filter with equal depths of 1.20 rom effective size crushed coconut shell and 0.42 romeffective size sand was found to give the best performance. The filter was found to operate at 2.4 times the filtration rate of the conventional rapid sand filter while maintaining the same effluent quality and length. of filter runs as the rapid sand filter. The filter also required a smaller percentage of filtered water for backwashing than the rapid sand filter. Durability tests on crushed coconut shell media have indicated that the media would be durable against microbiological degradation while in service. Scrapping off the less compact surface layer of the shell was found to improve the durability of the media

Magazine Article
P.K N. "Mitigating Engineering Profession Regulatory Gaps." Kenya Policy Briefs. 2021;2(2):73-74.
Journal Article
E.A O, P.G N, P.K N. "Anaerobic Co-Digestion of Water Hyacinth (E. crassipes) With Ruminal Slaughterhouse Waste for Biogas Production." Int. Journal of Renewable Energy Development. 2019;8(3):253-259.
B K, Kaluli J.W, P N, G T’o. "Optimization of Maerua Decumbent bio-coagulant in paint industry wastewater treatment with response surface methodology." Journal of Cleaner Production. 2017;164:1124-1134.
Kakoi, Kaluli NT’o. "Banana pith as a natural coagulant for polluted river wate." Ecological Engineering. 2016;95:699-705.
B K, Kaluli J.W, Peter N, G T’o. "Removal of Lead (II) from Aqueous Solution using Natural Materials: A Kinetic and Equilibrium Study." Journal of Sustainable Research in Engineering. 2016;3(3):53-62.
Omondi E.A, Ndiba P.K NPG. "Phytoremediation of Polychlorobiphenyls (PCB’s) in Landfill E-Waste Leachate with Water Hyacinth (E.Crassipes)." International Journal of Scientific & Technology Research . 2015;4(5):147-156.
D.D. K, Z.I. O, P.K. N. "Application of GIS to Water Quality Management for the City of Nairobi Water Supply." ICASTOR Journal of Engineering. 2014;7(1):5-23.oonge.docx
Sandhu N.K, Axe L NJPKK. "Metal and Metalloid Concentrations in Domestic and Imported Glass Beads used for Highway Marking." Environmental Engineering Science. 2013;30(7):387-392.
Kinney, Patrick L; Gichuru MG; V-CN; NN; NPLA; GA;K; G. "Traffic Impacts on PM2.5 Air Quality in Nairobi, Kenya.". 2012.
Ndiba PK. "Risk assessment of metal leaching into groundwater from phosphate and thermal treated sediments." Journal of Environmental Engineering. 2010;136(4):427-434.
Odira, P. M. A; Ndiba PK. "Performance of crushed coconut shell dual media filter.". 2007.
Conference Proceedings
Conference Paper
Ndiba PK, Axe L, Jahan K, Ramanujachary V. XRF measurement of heavy metals in highway marking beads..; 2009.Website

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