新型户用沼气池对血吸虫卵杀灭效果观察

Effect of Killing Schistosome Eggs by Family-size Biogas Tanks

目的观察新型户用沼气池对血吸虫卵的杀灭效果。方法将含活血吸虫卵的阳性人粪以模拟自然排粪状态和用尼龙绢袋包裹两种方式投放到沼气池中,前者每周、后者在平常出粪和大量出粪两个时期每两周取出粪样进行孵化并计数毛蚴。结果以自然排粪方式投放,连续9周每周从沼气池出口取样孵化均为阴性;以尼龙绢袋包裹方式投放后,从第4周开始孵化计数为零。结论新型户用沼气池对血吸虫卵有明显的杀灭作用。

Objective To study the effect of killing schistosome eggs by the family -size biogas tanks. Method Human feces containing large number of living schistosome eggs and being collected from hyper-endemic area after stool examination were put into the biogas tanks by 2 ways i. e. imitated natural defecation （biogas tank A） or bagged in nelon bags （biogas tanks B1 and B2）. The stool specimens from biogas tank A were examined with hatching test once every week for 9 weeks while that from biogas tanks BI and B2 were examined every 2 weeks. Results The results showed that hatching tests of natural defecation model （biogas tank A） were negative in continuous 9 weeks and of nelon bag model （biogas tanks B1 and B2） were negative from the 4th week and continuously negative in 6th and 8th week. Conclusion The family-size biogas tanks showed obvious effect on killing schistosome eggs.