The study aimed to analyze desalination and water purification using modified double-slope passive solar still (MDSPSS). The MDSPSS technique was chosen to promote sustainability and minimize energy consumption, chemical additives, and environmental impacts as compared to other conventional desalination processes. It also provided flexibility for the variation in feed-water quality. The performance evaluation of MDSPSS was done experimentally as well as theoretically in terms of physicochemical parameters including water quality parameter, and heavy metals, productivity.

An economic analysis was also performed to understand the viability of the water purification and desalination process. The setup was fabricated in combination with fiberglass-reinforced plastic sheets (5 mm thickness) and transparent acrylic sheets (3 mm thickness) with a total basin area of 2 m2. The experimental runs were carried out on typical days of June and December in 2017 to account for summer as well as winter conditions. The cumulative distillate productivity was obtained about 8.21 l/day and 6.01 l/day at 1.0 cm water depth during the summer and winter season, respectively. The experimental results were compared with standard (water quality) values recommended by the US Environmental Protection Agency and World Health Organization. The cost of the distilled water, as per the economic analysis, over 15 years of use was found to be $0.009 and $0.027 per liter and per kWh, respectively with a currency conversion rate of ₹73.25 for every $, with a payback period of 99 days. The maximum (instantaneous) energy efficiency and overall energy efficiency of MDSPSS in this study were found to be 26.18% and 10.12%, respectively.

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The study aimed to analyze desalination and water purification using modified double-slope passive solar still (MDSPSS). The MDSPSS technique was chosen to promote sustainability and minimize energy consumption, chemical additives, and environmental impacts as compared to other conventional desalination processes. It also provided flexibility for the variation in feed-water quality. The performance evaluation of MDSPSS was done experimentally as well as theoretically in terms of physicochemical parameters including water quality parameter, and heavy metals, productivity.

An economic analysis was also performed to understand the viability of the water purification and desalination process. The setup was fabricated in combination with fiberglass-reinforced plastic sheets (5 mm thickness) and transparent acrylic sheets (3 mm thickness) with a total basin area of 2 m2. The experimental runs were carried out on typical days of June and December in 2017 to account for summer as well as winter conditions. The cumulative distillate productivity was obtained about 8.21 l/day and 6.01 l/day at 1.0 cm water depth during the summer and winter season, respectively. The experimental results were compared with standard (water quality) values recommended by the US Environmental Protection Agency and World Health Organization. The cost of the distilled water, as per the economic analysis, over 15 years of use was found to be $0.009 and $0.027 per liter and per kWh, respectively with a currency conversion rate of ₹73.25 for every $, with a payback period of 99 days. The maximum (instantaneous) energy efficiency and overall energy efficiency of MDSPSS in this study were found to be 26.18% and 10.12%, respectively.

**[Access the Conference Proceedings Paper on ASCE Library](https://doi.org/10.1061/9780784483466.002)** 

Desalination and Water Purification Analysis Using Modified Double-Slope Passive Solar Still

Created in 1999, the Environmental & Water Resources Institute (EWRI) is the recognized leader within ASCE for the integration of technical expertise and public policy in the planning, design, construction, and operation of environmentally sound and sustainable infrastructure impacting air, land and water resources.

[Paper Proceedings](https://doi.org/10.1061/9780784483466)