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首页> 美国政府科技报告 >Potential Health Hazards Associated with the Disposal of Sewage Sludge on Agricultural Soils in Western Oregon
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Potential Health Hazards Associated with the Disposal of Sewage Sludge on Agricultural Soils in Western Oregon

机译：与俄勒冈州西部农业土壤中污水污泥处理相关的潜在健康危害

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Field experiments were carried out to determine the extent of potential health hazards due to the persistence of fecal coliform bacteria in four Willamette Valley soils after application of anaerobically-digested sewage sludge. It was originally thought that the cool, wet, climate which occurs in the Willamette Valley over much of the fall, winter, and spring months would prolong the survival length of fecal bacteria so that ground and surface waters might be contaminated. Climatic data and coliform downward movement (through washing) were measured and no prolongation of fecal coliforms by the cool, moist winter weather was found. The fecal coliforms died off at roughly equal rates in all the four soils in the winter and more rapidly in the Dayton and Cloquato soils in the summer. Bacteria transport occurred down to 100 centimeters but declined to less than 20 cells per 100 milliliter by the fifth week and only a few cells reached perched water tables at two of the sites. The fecal streptococci were found to be unsuitable for reliable testing of bacterial levels from recent pollution in soil. It was concluded that sewage sludge application year-round is feasible and not a great health hazard if carried out properly.

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