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Research Paper | Civil Engineering | India | Volume 3 Issue 6, June 2014
Improving the Initial Effluent Quality of a Rapid Sand Filter by Coagulants as Polymer in Back Wash
Abstract: Need of water purification was realized by man in early stages of civilization. So; Central and State Government are making efforts to provide adequate and safe drinking water to the people by constructing water treatment plants in the country. In our country rapid sand filters are used in water treatment plant for filtration process through which fine particles are removed. Filtration process under goes degradation at initial and last phase which affect the initial effluent quality of filtrate after back washing. The rapid sand filter is important unit of water treatment plant which removes the flocs and colloids through filtration. Initial phase in which the colloids are deeply entered in the filter and clogging occurs earlier resulting in frequent back washing. After backwashing filter when rapid sand filter brought back in to normal operation high initial turbidity of filtrate is observed. It is in the form of turbidity spike. To reduce this turbidity spike filter conditioning is essential. The present study is for rapid sand filter conditioning using coagulants as polymer in different percentage during backwashing of rapid sand filter. The optimal dosage as well as corresponding points of application during backwashing will be determined based on laboratory scale studies which found to be improved in initial effluent quality of rapid sand filter.
Keywords: rapid sand filter, backwashing, coagulants, initial effluent quality
Edition: Volume 3 Issue 6, June 2014,
Pages: 2227 - 2231