نتایج جستجو برای: trickling filtration
تعداد نتایج: 38335 فیلتر نتایج به سال:
Background and aims: Air pollution is one of the most important factors in conflict with environmental quality in many cities around the world that can have negative effects on human health. Emission control from industrial and domestic sources in line with the objectives of sustainable development is an important and challenging problem. Decision making with regard to various indices of social...
in this study the filtration rate of nitrogen and phosphorus components by swan mussel anodonta cygnea in a closed system was investigated. the system was built of a 100 liters main tank and 4 recipients of 2.5 liters each (one of these as control) and one tank for returning of water. three treatments of different concentrations of nitrogen (80, 100 and 200 mg/l) and of phosphorus (20, 40 and 6...
Different from Europe, where continuous flow activated sludge plants are the first choice for domestic wastewater treatment, specific Latin American conditions promote alternative technical solutions. In many locations wastewater temperatures are relatively high, land is available and areas pestered with energy shortages abound. Moreover, there is little specialised mechanical equipment for was...
The aim of this study was to evaluate the influence of multiple factors on bacterial contamination in 213 ejaculates from four boar studs. Semen contamination by aerobic mesophiles increased in ejaculates where the preputial fluid flowed into the collection container, collection glove was dirty, preputial hair was long (>1.0 cm), the collection lasted >7 min and boars were older than 18 months....
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