Impact of human activities and fertilizer effluent on quality of water of Disang River at Namrup, Dibrugarh District, Assam, India

摘要

The paper deals with some of the physico-chemical parameters of water of Disang River at effluent discharge point of fertilizer factory and at immediate up and down stream of fertilizer effluent discharge point at Namrup area. Manually stones from riverbed are collected at effluent discharge area and immediate down stream. Period of study was from pre-monsoon/2004 to post-monsoon/2005. Parameters studied were PH, turbidity, alkalinity, Ammonical nitrogen, dissolved oxygen, hardness, carbonate, bicarbonate, phosphate, sulphates and chloride.The data generated was compared with ISI and WHO standards (1991). The parameters recorded were found that in effluent discharge point and in down stream results fluctuated and some of them not within the permissible limits. PH in effluent discharge point lies in the range of 8.1 to 9.8.Turbidity was in the range of 100 to 900 NTU,Ammonical nitrogen in the range of 8 to 20mg/ L, dissolve oxygen was less and in on sample it was found nil.