Gohain Sonali Borpatra, Bordoloi Sabitry
Resource Management and Environment Section, Institute of Advanced Study in Science and Technology (IASST), Paschim Boragaon, Guwahati, 781035, Assam, India.
Environ Monit Assess. 2021 Apr 16;193(5):278. doi: 10.1007/s10661-021-09040-y.
The municipal solid waste (MSW) dump in Boragaon, Guwahati, lies on the fringe areas of the wetland, Deepor Beel, which is a Ramsar site. The study was undertaken to analyze the impact the solid waste dump has on the adjoining wetland. Five sampling locations (S1, S2, S3, S4 and S5) in the wetland were selected within a distance of 3000 m from the MSW dump for the continuous monitoring of the surface water and sediment of the wetland. Nineteen physicochemical parameters (pH, EC, air and water temperature, total hardness, alkalinity, turbidity, DO, free CO, TDS, BOD, Na, K, Ca, Cl, NO, HCO, PO, SO) were analysed in the surface water, and 7 physicochemical parameters (pH, EC, %OC, %N, PO, K, Na) were analysed in sediment. Heavy metals Cu, Ni, Cd, Cr, Mn, Zn and As were analysed in surface water and sediment samples. The results of the principal component analysis (PCA) and cluster analysis (CA) applied on the surface water data have aptly described the source of contamination in the study area to be from the adjoining MSW dump site. The surface spread of contamination from the MSW dump towards the wetland was evident from the regression equations drawn from the sediment data. The mean concentration of Mn, Cr, Ni, Cd and As in surface water exceeded the MPL (maximum permissible limit) of WHO 2011 (World Health Organization). The pollution load index (PLI) of sediment in the wetland shows that the study area is under the category of "progressive deterioration".
位于古瓦哈蒂博拉冈的城市固体废弃物（MSW）垃圾场，位于拉姆萨尔湿地迪普奥里比尔的边缘地区。开展这项研究是为了分析固体废弃物垃圾场对毗邻湿地的影响。在距MSW垃圾场3000米范围内的湿地中选择了五个采样点（S1、S2、S3、S4和S5），用于对湿地地表水和沉积物进行连续监测。对地表水中19项理化参数（pH值、电导率、气温和水温、总硬度、碱度、浊度、溶解氧、游离二氧化碳、总溶解固体、生化需氧量、钠、钾、钙、氯、硝酸盐、碳酸氢盐、磷酸盐、硫酸盐）进行了分析，并对沉积物中的7项理化参数（pH值、电导率、有机碳百分比、氮百分比、磷酸盐、钾、钠）进行了分析。对地表水和沉积物样本中的重金属铜、镍、镉、铬、锰、锌和砷进行了分析。对地表水数据进行主成分分析（PCA）和聚类分析（CA）的结果，恰当地描述了研究区域的污染源来自毗邻的MSW垃圾场。从沉积物数据得出的回归方程表明，MSW垃圾场对湿地的污染表面扩散明显。地表水中锰、铬、镍、镉和砷的平均浓度超过了世界卫生组织2011年的最大允许限值（MPL）。湿地沉积物的污染负荷指数（PLI）表明，研究区域属于“逐渐恶化”类别。
