Department of Parasitology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Water Res. 2011 Nov 1;45(17):5523-8. doi: 10.1016/j.watres.2011.08.008. Epub 2011 Aug 23.
This work investigated the inactivation of Ascaris lumbricoides eggs in domestic effluents by gamma radiation from a (60)Co source. Domestic wastewater was treated in a compact demo-scale system consisting of a UASB reactor and a trickling filter; treatment was carried out at the Center for Research and Training on Sanitation (CePTS), Federal University of Minas Gerais, in Belo Horizonte-MG, Brazil. One-liter of treated wastewater samples was artificially contaminated with an average of 1000 non-embryonated Ascaris lumbricoides eggs from human feces; samples were then irradiated in a multiple-purpose irradiator at different doses (0.5-5 kGy). Eggs were recovered from the wastewater and the viability of these irradiated eggs was evaluated; the description of the egg developmental phases with each dose of gamma radiation was recorded. Radiation doses of 3.5 kGy effectively disinfected effluents with lower concentrations of A. lumbricoides eggs; higher radiation doses of 5 kGy were necessary to disinfect effluents with higher eggs concentrations.
本研究旨在探讨（60）Co 源γ射线对家庭污水中蛔虫卵的灭活效果。家庭污水在由上流式厌氧污泥床（UASB）反应器和滴滤池组成的紧凑型示范系统中进行处理；该处理系统由巴西米纳斯吉拉斯联邦大学环境卫生研究与培训中心（CePTS）运行。将 1 升经处理的污水样品人工污染 1000 个来自人类粪便的平均未胚胎化蛔虫卵；然后将这些样品在多用途辐照器中用不同剂量（0.5-5 kGy）进行辐照。从废水中回收卵，并评估这些辐照卵的活力；记录了每个剂量的γ辐射对卵发育阶段的描述。3.5 kGy 的辐射剂量可有效消毒低浓度蛔虫卵的污水；对于高浓度卵污水，需要更高的 5 kGy 辐射剂量。
