Background

Agadir city plans to reuse treated wastewater on a large scale to irrigate these green spaces. This study aims to evaluate the risk of intestinal parasites, to which human and animal populations are exposed during the reuse of treated wastewaters.

Methods

Over 21 months, wastewater samples were collected in Bensergao and Mzar wastewater treatment plants, in Agadir city, southern Morocco. The occurrences and removal of intestinal parasites were inspected using the modified Bailenger method.

Results

The biodiversity of helminths is higher than protozoa, while the protozoa cysts are more abundant and more prevalent. Generally, the highest parasitic loads were recorded during the hot season. For raw waters, the average concentration of protozoa cysts was 173.33 ± 70.81 cysts per L for Bensergao plant and 179.33 ± 129.22 cysts per L for Mzar plant. However, the helminths average concentration was 48.70 ± 39.91 eggs/larvae per L for Bensergao plant and 51.10 ± 31.76 eggs/larvae per L for Mzar plant. The purified water of the Mzar plant does not contain parasites, unlike the Bensergao plant where a small numbers of parasites were detected, included 2.33 ± 1.53 cysts per L for protozoa and 0.45 ± 0.58 eggs/larvae per L for helminths.

Conclusions

Considering parasitological risks, the purified waters of Bensergao plant cannot be used without risks to the public health and environment. In contrast, the purified waters and the purified waters disinfected by ultraviolet radiation from the Mzar plant can be used safely to water the green spaces of Agadir city.

中文翻译：

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摩洛哥南部两个污水处理厂肠道寄生虫的发生和清除

背景

阿加迪尔市计划大规模再利用处理过的废水来灌溉这些绿色空间。本研究旨在评估肠道寄生虫的风险，人类和动物种群在处理过的废水再利用过程中会接触到肠道寄生虫。

方法

在 21 个月内，在摩洛哥南部阿加迪尔市的 Bensergao 和 Mzar 废水处理厂收集了废水样本。使用改良的 Bailenger 方法检查肠道寄生虫的发生和清除。

结果

蠕虫的生物多样性高于原生动物，而原生动物的包囊更丰富、更普遍。一般来说，在炎热季节记录的寄生负载最高。对于原水，Bensergao 植物的原生动物包囊平均浓度为 173.33 ± 70.81 个/L，Mzar 植物的原生动物包囊平均浓度为 179.33 ± 129.22 个/L。然而，Bensergao 植物的蠕虫平均浓度为每升 48.70 ± 39.91 个卵/幼虫，而 Mzar 植物的蠕虫平均浓度为每升 51.10 ± 31.76 个卵/幼虫。Mzar 植物的纯净水不含寄生虫，与检测到少量寄生虫的 Bensergao 植物不同，原生动物每升 2.33 ± 1.53 个包囊和蠕虫每升 0.45 ± 0.58 个卵/幼虫。

结论

考虑到寄生虫学风险，Bensergao 工厂的纯净水不能在没有危害公众健康和环境的情况下使用。相比之下，来自 Mzar 工厂的净化水和经紫外线辐射消毒的净化水可以安全地用于浇灌阿加迪尔市的绿地。