| Description |
vi, 93 leaves : illustrations ; 29 cm |
| Summary |
"This study was conducted to determine the fate of chemically-precipitated phosphorus during the overall wastewater treatment process under actual field conditions. Specific objectives were: to evaluate the removal of phosphorus with alum and sodium aluminate in a pilot plant activated sludge system, to determine the fate of the precipitated phosphorus incorporated into the microbial floc when placed in an anaerobic environment, and to observe the effect of aluminum on the digestion process. Five 38-gpd continuous-flow activated sludge pilot plant units were operated at the Rolla Love Creek trickling filter plant and were fed with settled domestic sewage. The sludge from the pilot plants, mixed with an appropriate quantity of primary sludge from the plant, was used to maintain five 3-1 anaerobic digesters. The parameters employed during the aerobic studies were influent and effluent phosphorus and aluminum, total and volatile suspended solids, and chemical oxygen demand; and those used in the anaerobic studies were phosphorus and aluminum in the feed sludge, the supernatant and the digester sludge, volatile acids, and gas production. The addition of alum and sodium aluminate to the activated sludge aeration chamber effectively removed phosphorus from domestic wastewater without adversely affecting the efficiency of the process. The precipitated phosphorus was concentrated in the digester sludge and was not released to the supernatant during anaerobic digestion, and the high concentration of the aluminum ion in the digester sludge produced no detrimental effects. The chemical precipitation of phosphorus in the activated sludge aeration chamber and anaerobic digestion of the sludge produced were found to be a feasible and effective method of eliminating at least part of the phosphorus input to lakes and streams, and could be incorporated into existing or future treatment plants with little capital expense"--Abstract, leaf ii. |
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