Power earth auger modification for waste extraction from pit latrines
Power earth auger modification for waste extraction from pit latrines
复制标题
用于从坑式厕所中提取废物的动力螺旋钻改造
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
R. Borden
中科院分区：
文献类型：
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作者：
Tate W. Rogers;F. L. Reyes;Walter J. Beckwith;R. Borden
为了满足在难以进入的地方清空坑式厕所的低成本、有效方法的需求，开发了抽水螺旋钻。基本设计包括一个电机，旋转管道内的螺旋钻，从坑提升废物，并通过设备顶部的Y形接头将其存放到容器中。螺旋钻的实验室测试表明，随着螺旋钻转速和废物粘度的增加，流速也会增加。带有外部液压驱动器的螺旋钻能够以每分钟超过125升的流速将乳制品废物提升超过2.5米。现场测试表明，该设备可有效提升含有液体和固体混合物的中等粘度废物。然而，螺旋推运器不能有效地去除低粘度的液体废物，液体废物将沿着螺旋推运器向后流动，从而降低提升效率。该螺旋钻能够钻入致密的固体废物，在废物中形成“柱孔”。然而，由于密集的固体废物不会流向螺旋钻入口，因此从坑中实际清除废物是有限的。需要改进方法，在用提取螺旋钻或其他技术清除之前，在坑中混合液体和固体废物。
The extraction auger was developed to meet the need for a low cost, effective method to empty pit latrines in difficult to access locations. The basic design consists of a motor that rotates an auger inside a pipe, lifting waste from a pit and depositing it into containers through a wye fitting at the top of the device. Laboratory testing of the auger showed increases in flow rates with increasing auger rotational speed and waste viscosity. An auger with an external hydraulic drive was capable of lifting dairy waste over 2.5 m, at flow rates of over 125 liters per minute. Field-testing showed the equipment was effective at lifting medium viscosity wastes containing a mixture of liquid and solid material. However, the auger was not effective in removing low viscosity, liquid waste that would flow backward down the auger reducing lifting efficiency. The auger was capable of drilling into dense solid waste, forming a ‘posthole’ in the waste. However, since the dense solid waste would not flow towards the auger intake, actual waste removal from the pit was limited. Improved methods are needed to mix liquid and solid waste in pits prior to removal with the extraction auger or other technologies.