Use of bank filtration systems in the sub-tropical region of the lower Brahmaputra valley
Use of bank filtration systems in the sub-tropical region of the lower Brahmaputra valley
复制标题
雅鲁藏布江下游亚热带地区银行过滤系统的使用
DOI：
10.2166/wpt.2018.015
复制
发表时间：
2018
影响因子：
1.6
通讯作者：
A. Misra
中科院分区：
文献类型：
--
作者：
M. Ronghang;Pranjal Barman;Hemanta Medhi;Kamal Kumar Brahma;A. Misra
河岸过滤（RBF）是一种通过地下从河流或湖泊获取地表水供家庭使用的自然方法。它已在世界各地广泛用于增强供水系统的可持续性，并可在各种条件下运行。它的能源需求比传统的水处理系统相对较低。
在印度阿萨姆邦的科克拉贾尔地区的不同地点进行了实地调查，以评估地下水水质和含水层特征。结果表明，主要水质参数均符合印度饮用水标准。超过50%的手泵样品的铁浓度超过了允许的最大值，其浓度范围在0.33和3.50 mg/L之间。pH值大多在5.4至7.4的范围内，表明水是微酸性的。对沿高朗河岸沿着采集的含水层和河床物质进行筛分，并将其分为粗粉砂至细砾石，以砾石和砂为主。根据粒度分布确定的水力传导率在5 × 10−3和1.4 × 10−2 m/s之间，表明含水层渗透性良好。最大安全井产量估计为2，000至7，500升/分，平均旅行时间在季风期间不到一周，在非季风条件下超过3年。
本文的目的是证明在潮湿的气候条件下自然处理河水的RBF方法。雅鲁藏布江下游盆地是一个独特的自然地理环境，具有强大的季风制度和脆弱的地质基础。所采取的办法是准备对目前的地点和少数活跃的RBF地点的水质和含水层特性进行比较研究。
River bank filtration (RBF) is a natural method of obtaining surface water from a river or lake via the sub-surface for domestic use. It has been intensively used worldwide to augment water supply systems for sustainability and can be operated under various conditions. Its energy requirements are comparatively lower than those of conventional water treatment systems.
Field investigations were carried out at various locations in Kokrajhar district of Assam, India to assess groundwater quality and aquifer characteristics. The results suggest that major water quality parameters were within the Indian drinking water standards. The iron concentration exceeded the permissible maximum in more than 50% of samples from hand pumps, its concentration ranging between 0.33 and 3.50 mg/L. The pH was mostly in the range 5.4 to 7.4, suggesting that the water is slightly acidic. Aquifer and riverbed material collected along the banks of the Gaurang River were sieved, and classified as coarse silt to fine gravel, with gravel and sand predominant. The hydraulic conductivity, determined from the grain size distributions, were between 5 × 10−3 and 1.4 × 10−2 m/s, suggesting good aquifer permeability. The maximum safe well yield was estimated at 2,000 to 7,500 L/min, and the mean travel time at less than a week during the monsoon and more than 3 years under non-monsoon conditions.
The aim of this paper is to demonstrate the RBF method for treating river water naturally under wet climatic conditions. The lower Brahmaputra basin is a unique physiographic setting with a powerful monsoon regime and a fragile geological base. The approach was to prepare a comparative study of water quality and aquifer characteristics with the present site and few active RBF sites.