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首页> 外文期刊>Environmental Science & Technology >Sand Barriers around Latrine Pits Reduce Fecal Bacterial Leaching into Shallow Groundwater: A Randomized Controlled Trial in Coastal Bangladesh
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Sand Barriers around Latrine Pits Reduce Fecal Bacterial Leaching into Shallow Groundwater: A Randomized Controlled Trial in Coastal Bangladesh

机译：厕所坑周围的沙障可减少粪便细菌向浅层地下水的浸出：孟加拉国沿海地区的随机对照试验

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We evaluated the effectiveness of a sand barrier around latrine pits in reducing fecal indicator bacteria (FIB) leaching into shallow groundwater. We constructed 68 new offset single pit pour flush latrines in the Galachipa subdistrict of coastal Bangladesh. We randomly assigned 34 latrines to include a 50 cm thick sand barrier under and around the pit and 34 received no sand barrier. Four monitoring wells were constructed around each pit to collect water samples at baseline and subsequent nine follow-up visits over 24 months. Samples were tested using the IDEXX Colilert method to enumerate E. coli and thermotolerant coliforms most probable number (MPN). We determined the difference in mean log(10)MPN FIB counts/100 mL in monitoring well samples between latrines with and without a sand barrier using multilevel linear models and reported cluster robust standard error. The sand barrier latrine monitoring well samples had 0.38 mean log(10)MPN fewer E. coli (95% CI: 0.16, 0.59; p = 0.001) and 0.38 mean log(10)MPN fewer thermotolerant coliforms (95% CI: 0.14, 0.62; p = 0.002), compared to latrines without sand barriers, a reduction of 27% E. coli and 24% thermotolerant coliforms mean counts. A sand barrier can modestly reduce the risk presented by pit leaching.
机译：我们评估了厕所坑周围的防沙层在减少粪便指示菌（FIB）浸入浅层地下水中的有效性。我们在孟加拉国沿海的加拉奇帕分区建造了68个新的单坑单坑冲厕厕所。我们随机分配了34个厕所，在坑的下面和周围包括一个50厘米厚的防沙层，其中34个没有防沙层。在每个矿井周围建造了四个监测井，以在基线收集水样，并在接下来的24个月中进行了九次随访。使用IDEXX Colilert方法测试样品，以枚举大肠埃希菌和耐热大肠菌群的最大可能数（MPN）。我们使用多层线性模型确定了在监测有无沙障的厕所之间的井样中，平均log（10）MPN FIB计数/ 100 mL的差异，并报告了群集稳健的标准误差。防砂厕所监测井样品的大肠杆菌平均log（10）MPN减少0.38（95％CI：0.16，0.59; p = 0.001），耐热大肠菌群平均log（10）MPN减少0.38（95％CI：0.14， 0.62; p = 0.002），与没有防沙层的厕所相比，大肠杆菌减少了27％，耐热大肠菌群减少了24％。防砂层可以适度降低坑浸带来的风险。

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