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Results 1861-1870 of 61,991
Airborne studies of particles and gases from forest fires [Pollution].
1978
Radke L.F. | Stith J.L. | Hegg D.A. | Hobbs P.V.
Fluoride cycling near a coastal emission source [Levels in plant tissues].
1978
Ares J.O.
Some factors that affect the deposition rates of sulfur dioxide and similar gases on vegetation.
1977
Wesely M.L. | Hicks B.B.
Air pollution control philosophies [Emission standards, air quality standards, emission taxes, cost benefit analysis].
1977
De Nevers N.
Manpower for environmental pollution control: a review of a committee report.
1977
Atkins P.R. | Moeller D.W.
Response of bean and tobacco to ozone: effect of light intensity, temperature and relative humidity.
1977
Dunning J.A. | Heck W.W.
Improved ventilation of open top greenhouses [Air pollutants, plant injury].
1976
Kats G. | Thompson C.R. | Kuby W.C.
Increased zinc and copper availability in organic waste amended soil potentially involving distinct release mechanisms
2016
Tella M. | Bravin M. | Thuriès L. | Cazevieille P. | Chevassus-Rosset C. | Collin B. | Chaurand P. | Legros S. | Doelsch E.
This study aimed at determining the fate of trace elements (TE) following soil organic waste (OW) application. We used a unique combination of X-ray absorption spectroscopy analyses, to determine TE speciation, with incubation experiments for in situ monitoring of TE availability patterns over a time course with the technique of the diffusive gradients in thin films (DGT). We showed that copper (Cu) and zinc (Zn) availability were both increased in OW-amended soil, but their release was controlled by distinct mechanisms. Zn speciation in OW was found to be dominated by an inorganic species, i.e. Zn sorbed on Fe oxides. Zn desorption from Fe oxides could explain the increase in Zn availability in OW-amended soil. Cu speciation in OW was dominated by organic species. Cu release through the mineralization of organic carbon from OW was responsible for the increase in Cu availability. (Résumé d'auteur)
Show more [+] Less [-]Clean air: time for responsible reform [Air pollution].
1982
Hart G.
Processing of fecal sludge to fertilizer pellets using a low-cost technology in Ghana
2013
Nikiema, Josiane | Cofie, Olufunke O. | Impraim, Robert | Adamtey, Noah
This paper describes a study that was aimed at optimizing the pelletization of fecal sludge-based fertilizers for agricultural use. The process developed is easy to implement and increases the marketability of the products while also addressing a serious health and environmental challenge. The study took place during the period 2011-2012 in Ghana. The fecal sludge, rich in nutrients and organic matter, was dried and used to produce five different fertilizers (i.e., four formulations of compost and one with gamma irradiated material). Each material was then pelletized using locally constructed machinery. Key operating parameters, such as moisture content (10-55% in mass), binder type (clay or starch) and concentration (0-10% in mass), were varied and their impacts on the characteristics of pellets (e.g., amount of fine materials generated, length distribution or stability of pellets, and pellet disintegration rate) were also followed. Given the low analyzing capabilities of developing countries, some simple analytical methods were developed and used to compare pellets produced under different conditions. The results confirmed that the addition of 3% of pregelatinized starch is recommended during pelletization of fecal sludge-based fertilizers. Applicable moisture contents were also identified per fertilizer type, and were found to comprise between 21 and 43%.
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