Goyal S M, Gerba C P, Lance J C
Appl Environ Microbiol. 1980 Mar;39(3):544-7. doi: 10.1128/aem.39.3.544-547.1980.
Land treatment of wastewater is an attractive alternative to conventional sewage treatment systems and is gaining widespread acceptance. Although land application systems prevent surface water pollution and augment the available water supplies, the potential dangers to human health should be evaluated. Since sewage may contain high amounts of bacterial endotoxin, the removal of endotoxin from sewage by percolation through soil was investigated. It was found that 90 to 99% of the endotoxin was removed after travel of sewage through 100 to 250 cm of loamy sand soil. When distilled water was allowed to infiltrate into the soil to simulate rainfall, the endotoxin was mobilized and moved in a concentrated band through the soil column. On testing samples from actual land treatment sites, as much as 480 ng of endotoxin per milliliter was found in some groundwater samples. The presence of endotoxin in potable water is known to be a potential problem under some circumstances, but the importance of endotoxin in water supplies has not been fully assessed. Therefore, the design, operation, and management of land application systems should take into account the fate of endotoxin in groundwater beneath the sites.
污水土地处理是传统污水处理系统的一种有吸引力的替代方案，并且正在得到广泛认可。尽管土地应用系统可防止地表水受到污染并增加可用水资源，但仍应评估其对人类健康的潜在危害。由于污水可能含有大量细菌内毒素，因此研究了通过土壤渗滤去除污水中内毒素的方法。研究发现，污水通过100至250厘米的壤质砂土后，90%至99%的内毒素被去除。当让蒸馏水渗入土壤以模拟降雨时，内毒素被 mobilized 并在一个浓缩带中穿过土柱移动。在对实际土地处理场地的样本进行检测时，在一些地下水样本中发现每毫升高达480纳克的内毒素。已知在某些情况下，饮用水中存在内毒素是一个潜在问题，但内毒素在供水系统中的重要性尚未得到充分评估。因此，土地应用系统的设计、运行和管理应考虑场地下方地下水中内毒素的归宿。 （注：原文中“mobilized”这个词在这个语境下不太好准确翻译，暂保留英文，可能需要结合更多背景知识准确理解其含义后再进行更合适的翻译）
