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Subject: Soil and Water Engineering × Author: KAU × Author: Shijila, Erikottil × End date: 2014 × Start date: 2014 × Type: Thesis × Thesis Type: M.Tech. ×
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    ThesisItemOpen Access
    Development of a filter system for roof water harvesting
    (Department of Land and Water Resources and Conservation Engineering, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 2014) Shijila, Erikottil; KAU; Sathian, K K
    This thesis work was undertaken to study the performance of modified mesh filter under rainfall. The mesh filter was modified with two other filters such as sand and charcoal filter and their combination study was conducted on artificial rainwater and evaluated the quality of filtered water. The two filters are fabricated with naturally available material such as above 1 mm size coarse sand and small pieces of burned coconut shell. These materials are freely available from surroundings and each material was filled in each PVC pipes of 25 cm length. From the first study four buildings are selected in the campus have different impurity levels that because of rain fall events, purposes or constructed material. It was found that there are small variations in the quality of harvested water but after filtration all results are same because filter was not depends on the roofing material and impurity level. The quality parameter like pH of the rainwater harvested after the filtration with mesh filter for all roofs met the USEPA secondary drinking water standard range of 6.5-8.5. The electrical conductivity, turbidity and suspended solids are also met the drinking water standards by WHO and the calculated average filter efficiency of mesh filter was 81.3 %. From the filter combination study the quality parameter such as pH, electrical conductivity, turbidity and suspended .,olids also examined through water quality analyzer of collected samples. As per the BIS 10500 of 2004 and WHO all the results are in the permissible range. The BOD test result was ranging from 44 to 92 mg/l and compared to inflow the filtered water has drastic reduction in the values. From the coliform test it was cleared that there were no colifirms (011 OOml) in the filtered water after 24 hour incubation period where as in inflow water coliforms were detected. It was found that there is a marked reductio'. .n the concentration of impurities, The reduction in im urities ranges from 84 to 86 % and the charcoal tilter has highest filtration rate of 9.42 m3/minlm2 compared to others. The results clearly. revealed that combined filters remove the impurities in a more efficient manner than of the mesh filter developed earlier. There is only minor difference between the both filters. The results clearly revealed that combined filters remove the impurities in a mo: e efficient manner than of the mesh filter developed earler. There is only minor difference between the both filters.