الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This investigation was to examine the effect of filter backwash water
(FBWW) when mixing with raw water (RW) sand- filters Clogging
happens due to the passage of microorganism and particles. So back
washing is needed and this backwashing needs up to 10-15% of the fresh
water, after that it’s thrown as wastewater. The treatment of FBWW
depends on its usage either for drinking or for irrigation purposes,
depending on the compliance with the standards in the water quality
specifications. As a result several tests were conducted to identify the
possibility of re-use of FBWW as drinking water by re-introducing it
with RW before the conventional treatment. FBWW samples were
collected from filters in Giza water plant and analyzed; also it was mixed
with raw water at different ratios ranges from 10% to 50%. Turbidity
(NTU), TDS (mg/l), Cl2 (mg/l), Al (mg/l) ,So4 (mg/l), and other
parameters were recorded for RW, FBWW and mix of both . It was
indicated by Jar test that RW quality could be improved by mixing of
FBWW with it. And showed that the best mixing ratio was 40% FBWW
to 60% RW, also the economic feasibility of water reuse was discussed.
Chapter OneThis investigation was to examine the effect of filter backwash water
(FBWW) when mixing with raw water (RW) sand- filters Clogging
happens due to the passage of microorganism and particles. So back
washing is needed and this backwashing needs up to 10-15% of the fresh
water, after that it’s thrown as wastewater. The treatment of FBWW
depends on its usage either for drinking or for irrigation purposes,
depending on the compliance with the standards in the water quality
specifications. As a result several tests were conducted to identify the
possibility of re-use of FBWW as drinking water by re-introducing it
with RW before the conventional treatment. FBWW samples were
collected from filters in Giza water plant and analyzed; also it was mixed
with raw water at different ratios ranges from 10% to 50%. Turbidity
(NTU), TDS (mg/l), Cl2 (mg/l), Al (mg/l) ,So4 (mg/l), and other
parameters were recorded for RW, FBWW and mix of both . It was
indicated by Jar test that RW quality could be improved by mixing of
FBWW with it. And showed that the best mixing ratio was 40% FBWW
to 60% RW, also the economic feasibility of water reuse was discussed.