Effect of Filter Backwash Water when blends with Raw Water on Total Organic Carbon and Dissolve Organic Carbon Removal

摘要

Clogging of sand-granular-gravel media filters due to increased passage of particles and microorganism is a common problem of the water treatment plants (WTP). To prevent from this problem, there is need of back washing and this results loss of water. In most of the drinking WTP filter backwash water (FBWW) and clarified sludge water (CSW) are generated. Reuse of FBWW is of great interest. Recycling of FBWW and its suitable treatment is possible in order to provide guarantee of water quality. Experiments were performed with RW and FBWW from full scale surface water Bhagirathi water treatment plant (BWTP). Impact of removal of total organic carbon (TOC) and dissolve organic carbon (DOC) was examined by blending of FBWW 5, 7 and 10% respectively with RW. Significantly higher removal of TOC and DOC was showed by 7% blending of FBWW with RW as compared to RW. Jar test results indicated that the improvements in RW quality could be achieved by recycling of FBWW with RW. Other parameters such as turbidity, colour, total aluminum, total iron, and total suspended solids were recorded for RW, FBWW and blends of both and found significant differences.