Abstract
Wastewater treatment plants operators prefer to make adjustments because they are more cost effective, to use the existing tank instead of building new ones. In this case an imported materials would be used as bio-loads to increase biomass and thus maintain efficiency as the next organic loading increases.In the present study, a local substance "pumice stone" was used as a biological carrier in the aeration tank, and the experiments were carried out in five stages: without biological carriers, filling ratio of 4%,10%,20%, and25% with pumice stone, the maximum organic loading at each stage (1.1884, 1.2144, 1.9432, 2.7768, 3.3141)g BOD /l.d respectively.Other experiments were carried out to determine the best filling ratio, the SS removal ratio was (67.57%, 69.5%,79.44%,89.61%,and 99.2%) when the filling ratio with pumice stone was (0, 4, 10, 20, and 25)% respectively, at organic loading 2 ± 0.0528 g BOD /l.d, so the best filling ratio of pumice stone was 25% . In this case an imported materials would be used as bio-loads to increase biomass and thus maintain efficiency as the next organic loading increases. In this research, a local substance "pumice stone" was used as a biological carrier in the aeration tank, and the experiments were carried out in five stages: without biological carriers, filling ratio of 4%,10%,20%, and25% with pumice stone, The maximum organic loading at each stage (1.1884, 1.2144, 1.9432, 2.7768, 3.3141)g BOD /l.d respectively. The SS removal ratio was when we operatio without biological carriers and with pumice stone with a filling ratio of 4% (82.86 % and 84.96 %) respectively, at organic loading 1.15 ± 0.0384 g BOD / d, the SS removal ratio when using pumice stone with a filling ratio of 4% and 10% was (80.36%, 91.59%) respectively, at organic loading 1.25 ± 0.024 g BOD /l.d The SS removal ratio when using pumice stone with a filling ratio of 10% and 20% was (79.44%, 91.23%) respectively, at organic loading 2 ± 0.0528 g BOD /l.d , and The SS removal ratio when using pumice stone with a filling ratio of 20% and 25% was (80.45 %, 92.28%) respectively, at organic loading 2.85 ± 0.0624 g BOD /l.d ,which means there is improvement in yield using pumice stone with filling ratio 4%,10%,20 and 25% by 2.1% ,11.23%,11.79% and 11.83%, respectively.
Highlights
Sewage treatment plants are designed for a period of (25-30) years, and at the end of it, engineering procedures must be taken to preserve the plant's output due to the increased organic loading coming to the plant
The combined modification of the conventional activated sludge process uses suspended or fixed media of a suitable material, which acts as carriers for the growth of active biomass on its surface, and this is called the integrated fixed-film activated sludge (IFAS) system(1)
First: The experiments were carried out in stages: without biological carriers, and by adding pumice stone with different filling ratios, all stages are shown in Table (3),the pumice stone filling ratio increased when the SS removal decreased to less than 83%
Summary
Sewage treatment plants are designed for a period of (25-30) years, and at the end of it, engineering procedures must be taken to preserve the plant's output due to the increased organic loading coming to the plant. These procedures are: Either the horizontal expansion of the treatment plant units (i.e. building new treatment units) and this procedure requires a high cost, or technical procedure to increase the biomass without adding new units. An integrated fixed-film activated sludge (IFAS) system is one of the most popular modified activated sludge processes which increases the microbial population and accelerates the biodegradation of organic compounds by adding a fixed media to a suspended growth basin (1).
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