خيارات البحث
النتائج 211 - 220 من 229
Stream, lake, estuary, and ocean pollution
1991
Nemerow, Nelson L.
Plant, element and soil properties governing uptake and availability of heavy metals derived from sewage sludge النص الكامل
1991
Sauerbeck, Dieter
Organic micropollutants in the aquatic environment
1991
Angeletti, G. | Bjørseth, Alf
Environmental asses[s]ment and management | Environmental assessment, social forestry in tribal regions and environmental management
1991
Trivedi, R. N. | Sen-Sarma, P. K. | Singh, M. P. (Mahesh Prasad)
Prediction and regulation of air pollution | Prognoz i regulirovanie zagri︠a︡znenii︠a︡ atmosfery. English
1991
Berli︠a︡nd, M. E.
Evaluation of agricultural nonpoint pollution potential in Pennsylvania using a geographic information system
1991
Petersen, Gary W.
Review of potentially harmful substances: carcinogens
1991
Report. IMO/FAO/UNESCO/WMO/WHO/IAEA/UN/UNEP Joint Group of Experts on the Scientific Aspects of Marine Pollution. Sess. 21
1991
Role of groundwater recharge in treatment and storage of wastewater for reuse النص الكامل
1991
Bouwer, H.
Reuse of municipal wastewater requires treatment so that the water meets the quality requirements for the intended use. Irrigation of vegetables consumed raw requires absence of pathogenic organisms. To achieve this, fecal coliform concentrations should be essentially zero and the water should be filtered. This requires intensive treatment. For developing countries, however, where adequate sewage treatment often is lacking, the World Health Organization allows up to 1000 fecal coliform bacteria per 100 ml, which can be obtained by lagooning. Potable reuse requires much more intensive treatment, including lime clarification, denitrification, carbon adsorption, reverse osmosis, and disinfection. Where hydrogeologic conditions permit groundwater recharge with surface infiltration facilities, considerable water quality improvement is obtained by the movement of the wastewater through the soil, vadose zone, and aquifer. The resulting soil-aquifer treatment costs are less than 40% of the costs of equivalent in-plant treatment. Soil-aquifer treatment systems also are simple and robust, offer storage of the water to absorb differences between supply and demand, and enhance the aesthetics of potable reuse of wastewater. Hence, they can play an important role in wastewater reuse.
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