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Результаты 31-40 из 306
Water characteristics [Mostly acid precipitation].
1981
Smith E.D.
Microbiology: detection of [waterborne] bacterial pathogens and their occurrence.
1981
Reasoner D.J.
Anaerobic digestion of brewery byproducts.
1981
Keenan J.D. | Kormi I.
Sources of soluble organic nitrogen in activated sludge effluents.
1981
Parkin G.F. | McCarty P.L.
Analytical solutions for transport of conservative and nonconservative contaminants in groundwater systems.
1981
Hoeks J.
Analytic solutions are given for a description of the transport of contaminants in groundwater flow systems. Equations describing the flow of groundwater along streamlines are combined with equations for interaction processes in soil as linear adsorption and first-order biochemical decay. Because dispersion has been neglected rather simple solutions could be derived. The analytic approach given, which includes the main properties of the soil system, proves to be useful for the prediction of groundwater contamination near waste disposal sites, when little quantitative information is available about soil inhomogeneity, dispersion coefficients and complex interaction processes. Therefore it can be a helpful tool for the selection of new sites for waste disposal. In such cases the use of very precise numerical models has little meaning.
Показать больше [+] Меньше [-]Losses of nitrogen, phosphorus and potassium from agricultural watersheds of minor rivers in the Oka valley [USSR].
1981
Kudeyarov V.N. | Bashkin V.N. | Kudeyarova A.Y.
The losses of nitrogen (NH(,4), NO(,3), N(, org)), phosphorus (P(, ortho), P(, poly), P(, org)) and potassium (K('+)) from watershed areas of minor rivers, draining regions of different agricultural land use in the Oka Valley, U.S.S.R., were investigated. No N, P, and K pollution was shown in these watersheds, even though the rate of losses was found to be highly correlated with the amounts of mineral fertilizers and FYM applied. The losses were also determined by the natural soil fertility, erosion processes and soil texture under the similar level of fertilization.
Показать больше [+] Меньше [-]Environmental factors influencing the rate of spread of the grass Deschampsia cespitosa invading areas around the Sudbury nickel-copper smelters [Ontario].
1981
Cox R.M. | Hutchinson T.C.
Computerized biological monitoring for demonstrating wastewater discharge.
1981
Gruber D. | Cairns J. Jr. | Hendricks A.C.
Sludge treatment/handling, preliminary treatment, and instrumentation top OandM [operation and maintenance] problem list.
1981
Hadeed S.J.
Bringing about an end to ocean dumping [Alternative uses for sludge, including acclaiming strip-mines for pasture].
1981
Feliciano D.V.
