Presence of parasitic protozoa and helminth in sewage and efficiency of sewage treatment in Tunisia
Presence of parasitic protozoa and helminth in sewage and efficiency of sewage treatment in Tunisia
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DOI：
10.1007/s00436-009-1396-y
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发表时间：
2009-08-01
影响因子：
2
通讯作者：
Sabbahi, S.
中科院分区：
文献类型：
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作者：
Ben Ayed, L.;Schijven, J.;Sabbahi, S.
突尼斯对未经处理和经处理的废水中的蠕虫卵和原生动物包囊进行了计数，以确定废水处理对它们的去除情况，并为制定目前缺乏的废水质量条例提供量化数据。2006-2007年期间，从突尼斯的17家工厂收集了未经处理和处理过的废水样本，并使用改进的Bailenger方法对其进行了寄生虫分析。两类寄生虫，即蛔虫属、结肠内阿米巴属、蠕虫属和带绦虫属。(组1)和溶组织内阿米巴、贾第鞭毛虫和带绦虫。(2)可根据废水处理后的去除情况在统计学上加以区分。第1组寄生虫清除1.1log(10)(92.4%)，第2组寄生虫清除0.61log(10)(76%)。突尼斯废水中普遍存在的寄生原生动物和污水处理不力导致它们在地表水中扩散，很有可能使人和动物接触到这些寄生虫，从而对健康产生不利影响，这一点从流行病学数据中也很明显。这项研究为风险评估研究和制定缓解策略，如提高废水处理效率提供了量化基础。
Helminth eggs and protozoan cysts were enumerated in raw and treated wastewater in Tunisia in order to determine their removal by wastewater treatment and to provide quantitative data for developing regulations for wastewater quality that are currently lacking. Raw and treated wastewater samples were collected from 17 plants in Tunisia during 2006-2007 and analyzed for parasites using the modified Bailenger method. Two groups of parasites, namely, Ascaris sp., Entamoeba coli, Enterobius vermicularis, and Taenia sp. (group 1) and Entamoeba histolytica/dispar, Giardia sp., and Taenia sp. (group 2) could statistically be distinguished according to their removal by wastewater treatment. Group 1 parasites were removed by 1.1 log(10) (92.4%) and group 2 parasites by 0.61 log(10) (76%). The ubiquitous presence of parasitic protozoa in Tunisian wastewater and ineffective wastewater treatment lead to their proliferation in surface waters with a high probability of exposure of human and animals to these parasites and consequent adverse health effects, as is apparent from epidemiologic data as well. This study provides a quantitative basis for risk assessment studies and development of mitigation strategies, such as improving wastewater treatment efficiency.