نتایج جستجو برای: organic substances
تعداد نتایج: 253652 فیلتر نتایج به سال:
The effect of compost and humic acid in mobility and concentration of cadmium and chromium in contaminated soil were investigated. Experiment was carried out with three levels of soil cadmium and chromium and two organic matters (compost and humic acid). The study was performed in a randomized complete block design with 3 replicates. Results indicated that application of organic substances enha...
OBJECTIVES To investigate the sterility and biocompatibility of a stored open-reservoir cardiopulmonary bypass circuit maintained on standby. METHODS A total of four cardiopulmonary bypass circuits were assembled, primed and left to recirculate. One unit was placed in a positive-pressure operating room and the other three were placed in the intensive care unit. The primed solutions, which emp...
Landfill leachates are often treated on-site before disposal to municipal wastewater treatment plants, although variations in leachate composition and organic loading continue to have negative impacts on downstream treatment processes. Leachate samples were collected from four landfills both before and after on-site treatment to evaluate the extent of biological treatment. The samples vary in a...
Surface water and groundwater sources for human supply require treatment to remove substances that can cause human diseases and rejection. Aquatic humic substances, such as iron and manganese, interfere with the aesthetic and sanitary quality of the water because they cause color, odor and taste unpleasant. In addition, humic substances can form trihalomethanes which are serious harmful substan...
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