Domestic Grey Water Treatment by Fenton's Reagent for Re-Use in Toilet Flushing

Abstract

Due to increasing water scarcity in many regions around the world new water sources are developed. Greywater is one of the most reliable new sources of water. It works excellent in reducing water demand in households as well as prevents the contamination of surface water. The most commonly described application for greywater reuse is toilet/urinal flushing which can reduce water demand within dwelling by up to 30%. However, grey water has been considered for many other applications including irrigation of lawns at cemeteries, golf courses and college campuses, vehicle washing, fire protection, boiler feed water, concrete production and preservation of wet lands. The water quality requirements for each application are geospecific but normally contain criteria based . on organic, solids and microbiological content of the water. This study represents an attempt to evaluate the greywater treatment efficiency of Fenton's Reagent by testing specific parameters before and after oxidization and coagulation by Fenton's Reagent. In treatment approach 3, chemical treatment by Fenton's Reagent was followed by sand filtration. In approach 1, 2 and 3, dose of Fenton's Reagent was 1.13 gm/l and in approach 4 the dose was 2.25 gm/l. In approach 1, time of chemical treatment was 15 minutes and appro~~h 2, 3 and 4, the time of chemical treatment was 30minutes. In approach 1, BODs, COD, TSS, Turbidity and IC of treated grey water decreased respectively on an average 66.44%,67.34%,54,64%,36.43% and 99.99%. In approach 2, BODs, COD, TSS, Turbidity and Te of treated grey water decreased respectively on an average 78.08 %, 80.19%, 65.15%, 59.77% and 99.99%. Experiment showed that approach 2 is much more efficient than approach 1 for same Fenton's Reagent dosing. Based on above result proceeded next stage of the study. IV In approach 3, BODs, COD, TSS, TUrbidityand TC of treated grey water decreased respectively on an average 82.56%,87.16%,82.35%,94.31 % and 100%. In approach 4, BODs, COD, TSS, Turbidity and TC of treated grey water decreased respectively on an average 97.49 %,95.68%, 79.96%,88.36% and 100%. Treated grey water quality were compared with CANADA,JAPAN and USA standards for toilet and urinal flushing and it is found that most of the parameters of treated grey water of approach 3 and 4 satisfied these standards. Finally it is concluded that treatment approach 3 and 4 is appropriate for the domestic reuse of greywater in toilet or urinal flushing.