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Résultats 1361-1370 de 61,240
Dissolved oxygen in streams and reservoirs [Water quality standards, pollution effects on aquatic life].
1982
Bohac C.E.
Materials balance in aerated static pile composting [Wastewater sludge processing].
1981
Sikora L.J. | Willson G.B. | Colacicco D. | Parr J.F.
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.
Afficher plus [+] Moins [-]Deposition of sulphur gases from multiple scattered sources in Alberta [Canada].
1981
Walker D.R. | Dick A.C. | Nyborg M.
Various measurements utilizing soils, plants, precipitation and free water surfaces indicate that approximately 7 to 9 kg/ha of sulphate S was deposited annually within an area of 4600 km('2). This area contained or had adjacent to its boundaries 10 S emission sources for which the provincial government had established a combined allowable daily emission of approximately 330 tonne S. At distance of 40 or more km from the emission sources the annual deposition rate had declined to 4 to 6 kg/ha.
Afficher plus [+] Moins [-]Role of ascorbic acid in the toxicity of pesticides in a fresh water teleost.
1981
Verma S.R. | Tonk I.P. | Gupta A.K. | Dalela R.C.
The effect of ascorbic acid and pesticides (thiotox and malathion) on certain haematological parameters of a fish Saccobranchus fossilis was studied. The sublethal concentrations of thiotox (0.002 mg/l) and of malathion (5.2 mg/l) were tested. Ascorbic acid (2 mg/100 g body weight) was given with food. The alterations in haematological parameters (CT, PT, Hb, RBC, WBC, ESR, PCV, MCH, MCHC, MCV, glucose, protein, total P, Na, K, Mg, Ca, and Cl) were measured after 15 and 30 days exposure. Thiotox and malathion induced significant alteration in blood parameters while ascorbic acid played a protective role.
Afficher plus [+] Moins [-]Microbiology: detection of [waterborne] bacterial pathogens and their occurrence.
1981
Reasoner D.J.
Pulp and paper industry effluent management [Water pollution].
1981
Gove G.W.
Degradation of polychlorinated biphenyls by microorganisms.
1980
Yagi O. | Sudo R.
Microcosm system study of algal bloom formation [mainly Microcystis and Anabaenam, lakes in Japan].
1980
Okada M. | Sudo R.
Microbial ecosystems responsible for anaerobic digestion and composting.
1980
Finstein M.S. | Cirello J. | Suler D.J. | Morris M.L. | Strom P.F.
