Lee, Spatial –temporal variation and comparative assessment of water qualities of urban river system: a case study of the river Bagmati (Nepal). Journal of Material and Environmental Science, 2016, 7, 713-719. Kumar, Assessment of Surface Water Quality in Surha Lake using Pollution Index, India. Chakrapani, Temporal and spatial variations in water flow and sediment load in Narmada River Basin, India: Natural and man-made factors.
Mishra, Distribution of heavy metals in sediment and water of river Gomti. Maiti, The efficiency of Eichhornia crassipes in the removal of organic and inorganic pollutants from wastewater: a review Environmental Science and Pollution Research, 2017, 24, 7921–7937. The present study shows that EI and OPI index are the best parameters to assess water quality since it gives precise results based on four water quality parameters. With slight treatment, the water can be made available for drinking as well. Results also show that the river water is suitable for irrigation and life supporting for flora and fauna. In this study, four pollution indices have been determined on the basis of 16physico-chemical parameters, which indicates that the River Chambal  comes under the category of clear (CPI<0.8), oligotrophic (C-TSI<30-40), no eutrophication (EI<1) and excellent water quality (OPI<0).
This paper deals with the study on – “How environmental parameters impacts/affects the quality of river waterâ€. The survey results recommended that biodegradation, chemical, electrochemical, and photocatalytic oxidation, solid phase extraction, ozonation, reverse osmosis/nanofiltration, and wet air oxidation are useful methods in low phenol concentrations, whereas liquid–liquid extraction, pervaporation, membrane-based solvent extraction, adsorption, and distillation are suggested for high phenol concentrations.The present study is intended to ascertain the quality of water for public consumption and other life supporting activities by way of assessing pollution indices such as Carlson’s trophic state index (C-TSI), eutrophication index (EI), organic pollution index (OPI) and comprehensive pollution index (CPI).The study has been carried out for ten different sites in River Chambal of Madhya Pradesh, India, during pre and post-monsoon 2014. Finally, the best methods will be suggested for each concentration range at the influent and, of course, that is allowable in the final effluent. The most commonly used methods classified based on the phenol concentrations (high, medium, and low), and also, their advantages and disadvantages that should be considered in the design of industrial wastewater treatment systems will be discussed. In this paper, a review will be carried out on the traditional techniques and recent advances in the separation of phenol from its contaminated streams. The toxicity of phenol even at low concentrations in industrial effluents is high enough to meet its needs for separation.
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