Hill R T, Straube W L, Palmisano A C, Gibson S L, Colwell R R
Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore 21202, USA.
Appl Environ Microbiol. 1996 May;62(5):1741-6. doi: 10.1128/aem.62.5.1741-1746.1996.
Clostridium perfringens, a marker of domestic sewage contamination, was enumerated in sediment samples obtained from the vicinity of the 106-Mile Site 1 month and 1 year after cessation of sewage disposal at this site. C. perfringens counts in sediments collected at the disposal site and from stations 26 nautical miles (ca. 48 km) and 50 nautical miles (ca. 92 km) to the southwest of the site were, in general, more than 10-fold higher than counts from an uncontaminated reference site. C. perfringens counts at the disposal site were not significantly different between 1992 and 1993, suggesting that sewage sludge had remained in the benthic environment at this site. At stations where C. perfringens counts were elevated (i.e., stations other than the reference station), counts were generally higher in the top 1 cm and decreased down to 5 cm. In some cases, C. perfringens counts in the bottom 4 or 5 cm showed a trend of higher counts in 1993 than in 1992, suggesting bioturbation. We conclude that widespread sludge contamination of the benthic environment has persisted for at least 1 year after cessation of ocean sewage disposal at the 106-Mile Site.
产气荚膜梭菌是生活污水污染的一个指标，在106英里处停止污水排放1个月和1年后，从该地点附近采集的沉积物样本中对其进行了计数。在排放地点以及该地点西南26海里（约48公里）和50海里（约92公里）处的站点采集的沉积物中，产气荚膜梭菌的数量总体上比未受污染的参考站点高出10倍以上。1992年和1993年排放地点的产气荚膜梭菌数量没有显著差异，这表明该地点的底栖环境中仍有污水污泥。在产气荚膜梭菌数量升高的站点（即参考站点以外的站点），通常在表层1厘米处数量较高，向下至5厘米处数量减少。在某些情况下，底部4或5厘米处的产气荚膜梭菌数量在1993年比1992年呈现出更高的趋势，表明存在生物扰动现象。我们得出结论，在106英里处停止海洋污水排放后，底栖环境中广泛的污泥污染至少持续了1年。
