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Substratum-aerated-biofilm reactor for treatment of carbonaceous and nitrogenous wastewatersAbdel-Warith, Ahmed S. 09 March 1990 (has links)
This study involves the development of a biofilm
reactor that supports growth of a deep biofilm on a gas
permeable membrane. The reactor solution is not aerated,
and oxygen is supplied through the membrane. The reactor
is termed a substratum-aerated-biofilm reactor or SAB.
With adequate concentrations of electron-donors and
electron-acceptors, a deep biofilm grows on the membrane
and is comprised of different layers of bacterial activity.
The aerobic layers are near the membrane support, while the
anaerobic layers are near the biofilm-liquid boundary.
In the SAB, the substrate diffuses from the bulk
liquid into the biofilm to react. Oxygen diffuses through
the membrane into the biofilm. All products likewise are
transported by molecular diffusion through the biofilm and
into the bulk liquid.
The reactors consisted of a reactor wall made of a
plexiglass cylinder with the gas permeable membrane supported
on a shallow rotating cup. The cup was designed so
that the cup and the membrane function as a flat plate.
The flat plate was utilized for support of the biological
growth, transfer of oxygen, and mixing of the bulk liquid
and the gas phase.
The experiments were conducted in completely mixed,
continuous-flow reactors maintained at 25°C with a
hydraulic detention of 8 hours. Pure oxygen was delivered
to a gas compartment under the membrane. All reactors were
fed a synthetic waste buffered to pH 7.0. The background
solution for the feed solution was made from distilled
water combined with adequate inorganic nutrients and
vitamins. The background solution was supplemented with
acetate and ammonia to obtain the desired substrate compositions.
Combined nitrification and heterotrophic oxidation
activity resulted when the SABs where fed 5 or 10 mg/1
acetate, and 10 mg-N/1 ammonia. Combined nitrification,
heterotrophic oxidation, and denitrification resulted with
acetate concentration of 20, 40, and 100 mg/1, and 10 mg-
N/1 ammonia. Combined heterotrophic oxidation and fermentation
resulted with acetate concentration of 800 mg/1, and
10 mg-N/1 ammonia. A series of mass balances were
developed to determine the fate of the nitrogen compounds
and acetate. These results showed that the flux values for
carbon oxidation, nitrification, denitrification, and
fermentation are higher than those reported for competing
technologies such as rotating biological contactors. / Graduation date: 1990
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Integrated water treatment: softening and ultrafiltrationKweon, Ji Hyang 28 August 2008 (has links)
Not available / text
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Comparison of performance of thermophilic and mesophilic UASB reactorstreating protein-rich wastewater鍾偉聰, Chung, Wai-chung, Denis. January 1997 (has links)
published_or_final_version / Civil and Structural Engineering / Master / Master of Philosophy
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PHOSPHATE METABOLISM BY ZOOGLOEAL ORGANISMS FROM ACTIVATED SLUDGEBoughton, William Hart, 1937- January 1969 (has links)
No description available.
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Removal of algae and alkyl benzene sulfonate by coagulationParker, Clinton Eldridge. January 1964 (has links)
No description available.
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Thermal stratification in raw sewage stabilization pondsPisano, William C. January 1964 (has links)
No description available.
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Alkyl benzene sulfonate removal in raw sewage stabilization lagoonsDendy, Bill B. January 1962 (has links)
No description available.
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The use of oxidation ponds for the treatment of raw sewage in the SouthwestDooley, Eugene William, 1926- January 1963 (has links)
No description available.
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Reclamation of raw sewage stabilization lagoon effluentGeiser, Edward Frank, 1937- January 1966 (has links)
No description available.
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Floodplain filtration for treating municipal wastewatersKunjikutty, Sobhalatha Panangattu. January 2006 (has links)
The effectiveness of a cheap, low-tech, environmentally and technically favorable treatment of secondary treated municipal wastewater by contaminant removal through a floodplain-soil filter was evaluated using floodplain-simulating field lysimeters, packed with a sandy soil in 2002 and sand in 2003 and 2004. Secondary treated wastewaters from Vaudreuil (2002 and 2003) and Pincourt (2004) Wastewater Treatment Plants were used as influent. This was applied at rates of 0.06, 0.19, and 0.31 m3 m-2 d -1 to vegetated lysimeters, and at a rate of 0.19 m3 m-2 d-1 to bare-soil lysimeters. / Removal of NH4+-N, NO3--N, and COD from the influent was studied in all three years. Irrespective of flow rate or year, the system removed 62~84%, 96~99%, and 6~67% of TKN, NH4+-N, and COD, respectively, from the influent. Under 0.19 m3 m-2 d-1 flow rate, vegetated systems removed slightly more of these constituents from the influent, than did bare-soil lysimeters. Organic degradation mainly occurred in the top 0.1 m soil depth. Degradation of organic and inorganic influent nitrogen increased NO3--N levels in the effluent. Only minimal increases in soil-N levels and N2O emissions occurred with increasing application rates. The nitrogen mass balance accounted for 85∼98% (2003) and 67∼96% (2004) of input nitrogen (through leaching, soil retention, and N2O emissions), the remaining portion being attributable to vegetative effects and volatilization of non-N2O nitrogenous gases. The under established vegetation on the lysimeters reduced nitrogen leaching through soil, being 6% (2003) and 60% (2004) more effective than bare soil. / Effluent water quality improved with decreasing levels of heavy metals. Compared to influent levels, in vegetated lysimeters, under all flow rates, mean effluent As, Cd, Cu, Ni, Pb, and Zn levels had dropped by 58%, 9%, 3%, 37%, 63%, and 52% in 2003, and by 20%, 63%, 5%, 23%, 18%, 57%, and 79% for As, Cd, Cr, Cu, Ni, Pb, and Zn, in 2004. In both years, similar decreases in heavy metal levels occurred in the bare soil lysimeters. Across all flow rates and influent concentrations, soil heavy metal levels increased. In 2004, even low heavy metal content influent further increased (6∼179%) their accumulation in soil. As inputs of heavy metals to the soil increased with the increase in application rates, their associated times to reach maximum permissible limits also decreased. / LEACHN simulation of NO3--N in leachate arising from wastewater application, showed lowered levels with increasing flow rates, due to enhanced denitrification in the resulting anoxic upper soil zones. The simulation under continuous wastewater application at different range of nitrogen concentrations (low, medium, high) showed an increase of NO 3--N levels in the leachate with increasing N-levels. For all flow rates, and under tropical or humid conditions, the effluent NO 3--N levels remained below permissible limits for the low-N content wastewater applications. Intermittent applications, under all wastewater N-contents and flow rates, reduced NO3--N levels in the leachate by 51∼89% compared to continuous wastewater application, and permissible limits were not exceeded. Hence, wastewater with high levels of nitrogenous compounds, as occurs in most developing countries, could be treated by land under an intermittent application pattern, allowing a considerable reduction in nitrate pollution.
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