Performance Evaluation of a Rehabilitated Conventional Drinking Water Treatment Plant

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IJEP 44(4): 300-310 : Vol. 44 Issue. 4 (April 2024)

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Baibhav and Surinder Deswal*

National Institute of Technology Kurukshetra, Department of Civil Engineering, Kurukshetra – 136 119, Haryana, India

Abstract

To achieve sustainable drinking water supply, as is being focussed by United Nations Sustainable Development Goal 6 (SDG 6), it becomes essential to evaluate whether the new or rehabilitated water treatment plant (WTP) and its units are delivering potable water in accordance with the current water quality standards. This paper presents a comprehensive performance evolution of a rehabilitated conventional WTP and its units during monsoon, pre- and post-monsoon periods. The study revealed satisfactory performance of all treatment units – clariflocculators and filtration with 72.71-81.64% and 93.61-99.41% turbidity removal and disinfection with 1.44-1.55 mg/L of free residual chlorine. The overall performance of the WTP was also found satisfactory in terms of percentage reduction/removal efficiency of water indices – pH (6.67-15.65%), colour (90.00-90.23%), turbidity (98.38-99.91%), total dissolved solids (8.47-12.73%), total hardness (23.91-63.56%), alkalinity (25.46-59.83%), nitrates (84.24-92.68%) and iron (93.50-95.47%). The treated water quality was in accordance with the current standards of India and WHO. The water quality index (WQI) of treated water found was in the range of 5.05-10.26, which is of grade A (excellent water quality) during monsoon, pre- and post-monsoon periods.

Keywords

Sustainable development goal 6, Water treatment plant, Clariflocculators, Filtration, Disinfection, Water indices, Percentage removal efficiency, Water quality index

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