Zazouli Mohammad Ali, Hezarjaribi Hajar Ziaei, Charati Jamshid Yazdani, Ahmadnezhad Abbas, Mahvi Amir Hossein, Asgharnia Hosseinali
Department of Environmental Health Engineering, Faculty of Health, Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
Department of Parasitology, School of Paramedical, Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
J Environ Health Sci Eng. 2021 Oct 23;19(2):1623-1633. doi: 10.1007/s40201-021-00718-6. eCollection 2021 Dec.
The existence of parasite agents in natural organic fertilizers can lead to health problems and infection transmission. The aim of the present study was to survey the parasites' population reduction during the vermicomposting of the mixtures of municipal sewage sludge (SS) and cow dung (CD) using earthworms.
The vermicomposting process was performed by using earthworms of species. The composting process was conducted in 27 pilots for 3 months. The identification and counting of the parasites' population were carried out by Mac Master Slide, according to Bailenger method.
The results indicated that the type and number of parasite elements decreased with increasing vermicomposting time. The cumulative removal percent of parasites for sewage sludge (96.10%) was more than the SS + CD (93.65%) and CD (92.93%) treatments. The results showed that after 90 days of vermicomposting, the highest cumulative reduction in the number of parasites was obtained for the treatments with 40 earthworms (98.48%), while the corresponding value for the treatments without earthworms was (88.66%). The statistical analysis indicated that in terms of the parasite's population, a significant difference was observed for the three kinds of compostable materials ( < 0.05), however, this difference was not significant for the three levels of the earthworms ( > 0.05).
The results showed that the mixture of sewage sludge and cow dung in combination with sawdust could lead to greater and faster reduction in the parasite's population. In addition, the bio-transformed product can be used as useful manure.
天然有机肥料中存在寄生虫病原体可能导致健康问题和感染传播。本研究的目的是调查利用蚯蚓对城市污水污泥（SS）和牛粪（CD）混合物进行 vermicomposting 过程中寄生虫数量的减少情况。
使用特定种类的蚯蚓进行 vermicomposting 过程。堆肥过程在 27 个试验装置中进行了 3 个月。根据 Bailenger 方法，通过 Mac Master 载玻片对寄生虫数量进行鉴定和计数。
结果表明，随着 vermicomposting 时间的增加，寄生虫元素的种类和数量减少。污水污泥中寄生虫的累积去除率（96.10%）高于 SS + CD（93.65%）和 CD（92.93%）处理。结果表明，vermicomposting 90 天后，40 条蚯蚓处理的寄生虫数量累积减少率最高（98.48%），而无蚯蚓处理的相应值为（88.66%）。统计分析表明，就寄生虫数量而言，三种可堆肥材料之间存在显著差异（< 0.05），然而，蚯蚓的三个水平之间差异不显著（> 0.05）。
结果表明，污水污泥和牛粪与锯末的混合物可导致寄生虫数量更大、更快地减少。此外，生物转化产品可作为有用的肥料使用。
