Laboratoire Ecologie et Environnement (Unité associée au CNRST, URAC 32), Faculté des Sciences Semlalia, Université Cadi Ayyad Marrakech, Marrakech, Morocco.
Institut Supérieur des Professions Infirmières et Techniques de Santé, Marrakech-Safi, Morocco.
Environ Sci Pollut Res Int. 2019 Jan;26(1):570-576. doi: 10.1007/s11356-018-3618-2. Epub 2018 Nov 8.
The prevalence and the identification of the helminth eggs load of raw sewage sludge was assessed of three different wastewater treatment systems. The results showed a variety of parasite species with following average concentrations; five taxa belonging to three classes nematodes, cestodes and trematodes were inventoried. The class of nematodes is the most diverse with 5 taxa. It is represented by the eggs of Ascaris sp., Capillaria sp., Trichuris sp., Toxocara sp., and Ankylostome sp., then comes the cestodes class, this is represented by the eggs of Tænia sp. The trematode class is represented by Schistosoma sp. The lagooning station of Chichaoua shows the highest load 7 species with Ascaris 21 eggs/g; Capillaria sp., 11 eggs/g; Trichuris sp., 6 eggs/g; Toxocara sp., 2 eggs/g and Ankylostome sp., 1 egg/g; Taenia sp., 2eggs/g; and Schistosoma sp., 1 egg/g. Infiltration-percolation sludge show the presence of 4 species of helminths eggs in sludge from anaerobic settling with different rates: 15 eggs/g for Ascaris sp., 15 eggs/g for Trichuris sp., 13 eggs/g for Capillaria sp., and 8 eggs/g for Taenia sp. However, in sand filter pool, the sludge helminth eggs load was decreased by 47% of Ascaris sp., 85% of Capillaria sp., and 75% of Taenia sp., Nevertheless, an increase of Trichuris eggs load was noted in the second sludge by 17%. Five helminth eggs was detected in primary sludge coming from decantation pools in activated sludge plant in Marrakech, that is Ascaris sp., with a load of 16 eggs/g; Capillaria sp., with 3 eggs/g, Trichuris eggs with 2 eggs/g; Taenia sp., with 4 eggs/g; and Schistosoma sp., with 2 eggs/g. The abatement load of Ascaris sp. with 81% and Schistosoma and Taenia sp., with 100% was noted in biological sludge. Nevertheless, an increase load of Capillaria and Trichuris eggs 81% and 75% respectively was observed in this sludge coming from biological pools. The distribution of parasitic helminth eggs is linked to the differences in demographic and socio-economic status, seasonal variation, physico-chemical characteristic of helminth eggs, and the purification wastewater system performance.
评估了三种不同废水处理系统中未经处理污水污泥的寄生虫卵负荷的流行情况和鉴定。结果显示了多种寄生虫种类，平均浓度如下; 已发现五种归属于线虫、绦虫和吸虫三类的寄生虫。线虫类是最多样化的，有 5 个分类。它由蛔虫属、毛细线虫属、毛首线虫属、旋毛线虫属和十二指肠钩虫属的卵组成，其次是绦虫类，由带绦虫属的卵组成。吸虫类由血吸虫属的卵组成。化粪池站的负荷最高，有 7 种寄生虫，蛔虫属有 21 个卵/g；毛细线虫属，11 个卵/g；毛首线虫属，6 个卵/g；旋毛线虫属，2 个卵/g；十二指肠钩虫属，1 个卵/g；带绦虫属，2 个卵/g；血吸虫属，1 个卵/g。渗透池的污泥中存在 4 种寄生虫卵，来自于厌氧沉降池，不同的速率为：蛔虫属 15 个卵/g；毛首线虫属 15 个卵/g；毛细线虫属 13 个卵/g；带绦虫属 8 个卵/g。然而，在砂滤池中，寄生虫卵负荷减少了 47%的蛔虫属，85%的毛细线虫属和 75%的带绦虫属。然而，在第二个污泥中，毛首线虫属的卵负荷增加了 17%。马拉喀什活性污泥厂的沉淀池中分离出 5 种寄生虫卵，分别为蛔虫属，负荷为 16 个卵/g；毛细线虫属，3 个卵/g；毛首线虫属，2 个卵/g；带绦虫属，4 个卵/g；血吸虫属，2 个卵/g。在生物污泥中，蛔虫属的去除负荷为 81%，血吸虫属和带绦虫属为 100%。然而，在来自生物池的这种污泥中，发现了毛细线虫属和毛首线虫属的卵负荷分别增加了 81%和 75%。寄生虫卵的分布与人口统计学和社会经济地位、季节性变化、寄生虫卵的理化特性以及废水净化系统性能的差异有关。
