Abstract
The proposed research study aims to improve the productivity of solar still (SS) by using low-cost and eco-friendly materials. The aforementioned objective was achieved by enhancing the evaporation rate of seawater in the absorber basin and the condensation rate over the glass cover of the solar still. In this study, the low-cost and eco-friendly materials used for enhancing the evaporation rate in the solar still were molasses powder (MP), sawdust (SD) and rice husk (RH). In addition to these materials, bamboo straw (BS), banana leaf stem (BL) and rice straw (RS) were used as absorbing materials over the glass cover for enhancing the condensation rate. The experiments were carried out under similar meteorological conditions, and the results of the modified solar still were compared with the conventional solar still (CSS). The productivities of CSS, SSMP, SSRH, SSSD, SSBS, SSBL and SSRS were about 2250 mL/m2, 2383 mL/m2, 2467 mL/m2, 3033 mL/m2, 2700 mL/m2, 2683 mL/m2 and 3367 mL/m2, respectively. The results of the experimental investigation highlighted that the SSSD had a comparatively better evaporation rate and 34.81% higher yield than CSS. Besides, SSRS had a comparatively better condensation rate and a 51.88% higher yield than CSS. Furthermore, the combination of sawdust (SD) and rice straw (RS) was investigated for the combined enhancement of evaporation and condensation. The solar still with sawdust and rice straw (SSSDRS) showed a 62.88% improvement in productivity with 3633 mL/m2 when compared to CSS. Also, the economic analysis showed that the cost per litre (CPL) of freshwater obtained from SSSDRS was about ₹ 1.9 ($ 0.025) with a payback period of 4.4 months which was the least when compared to all the considered cases.
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Data Availability
Datasets related to this research article can be found at https://doi.org/10.17632/4s875xzmx8.1 an open-source online data repository hosted at Mendeley Data (Suraparaju and Natarajan 2021c).
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Sendhil Kumar Natarajan: Conceptualization, validation, resources, writing—review and editing, supervision, project administration.
Subbarama Kousik Suraparaju: Conceptualization, formal analysis, investigation, data curation, visualization, writing—original draft.
Rajvikram Madurai Elavarasan: Validation, writing—review and editing.
Rishi Pugazhendhi: Formal analysis, writing—review and editing.
Eklas Hossain: Writing—review and editing.
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Highlights
•The performance of solar still was examined with low-cost and eco-friendly materials.
•SSSD had a better evaporation rate and enhanced yield by 34.81%.
•SSRS had a better condensation rate and enhanced yield by 51.88%.
•SSSDRS enhanced evaporation and condensation rates with a 62.88% increase in yield.
•Cost/litre and payback period of SSSDRS were ₹1.9 and 4.4 months, respectively.
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Natarajan, S.K., Suraparaju, S.K., Elavarasan, R.M. et al. An experimental study on eco-friendly and cost-effective natural materials for productivity enhancement of single slope solar still. Environ Sci Pollut Res 29, 1917–1936 (2022). https://doi.org/10.1007/s11356-021-15764-8
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DOI: https://doi.org/10.1007/s11356-021-15764-8