Operation of Stabilization Ponds in a Tropical Area
Final rept. 1 Jul 1968-31 Dec 1973
GORGAS MEMORIAL INST WASHINGTON DC
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This studys objective is to provide operating parameters for design of stabilization ponds in tropic areas. Such ponds have the potential to provide a relatively easy to prepare, simple to operate and maintain, method of partial secondary wastewater treatment at low cost. Such ponds are widely used, however, tropical sunlight and temperature conditions are considered primary advantages for an environment for which to better develop design data. The contract effort consisted of a series of phases studies. The first studies dealt with single ponds 4-6 ft. 1.25-1.87 m deep. Subsequent studies involved the use of multiple ponds with anaerobicaerobic modes of operation. Fort Clayton, CZ area wastewaters were used as influents. A three-pond system, operating in the order anaerobic pond, faculative pond and maturation pond, was the best in terms of removal. Such removals were BOD5-75 COD-60, organic and ammonia nitrogen- 58 E. coli - 91. Orthophosphate and nitrate concentrations increased in this and most other configurations employed. A loading limit of 150 lb BOD5acreday 134 Kg BOD5haday was suggested. Multiple regression analysis was used to develop design effluent removals on the basis of influent content, influent- effluent flow, and meteorological considerations. Special studies were made on the survival of S. Typhi in a pond system, shock loadings of selected pesticides, mosquito control, and sludge build-up.
- Water Pollution and Control