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Causes of soil pollutionThis type of contamination typically arises from the rupture of underground storage tanks, application of pesticides, percolation of contaminated surface water to subsurface strata, oil and fuel dumping, leaching of wastes from landfills or direct discharge of industrial wastes to the soil. The most common chemicals involved are petroleum hydrocarbons, solvents, pesticides, lead and other heavy metals. This occurrence of this phenomenon is correlated with the degree of industrialization and intensities of chemical usage. Treated sewage sludge, known in the industry as biosolids, has become controversial as a fertilizer to the land. As it is the byproduct of sewage treatment, it generally contains contaminants such as organisms, pesticides, and heavy metals than other soil. There is also controversy surrounding the contamination of fertilizers with heavy metals.
percolation просачивание leaching выщелачивание sewage сточные воды fertilizer удобрение
Обратите внимание на баннер. Закончите предложения.
1. Biosolids are … 2. A pesticide is …
a) the nutrient rich by-product of wastewater treatment, generated by channeling human waste. b) any substance or mixture of substances intended for preventing, destroying, repelling or mitigating any pest. c) the end product after treating sewage sludge with anaerobic digestion in combination with heat. d) a chemical substance, biological agent (such as a virus or bacterium), antimicrobial, disinfectant or device used against any pest. e) living organism that occur where it is not wanted or that cause damage to crops or humans or other animals. f) not used to enrich nutrient-depleted and/or barren soil with essential nutrients.
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