Enhanced solar evaporation using a photo-thermal umbrella for wastewater management

Enhanced solar evaporation using a photo-thermal umbrella for wastewater management

TitleEnhanced solar evaporation using a photo-thermal umbrella for wastewater management
Publication TypeJournal Article
Year of Publication2020
AuthorsAkanksha K Menon, Iwan Haechler, Sumanjeet Kaur, Sean Lubner, Ravi S Prasher
JournalNature Sustainability
Volume3
Issue2
Pagination144 - 151
Date Published01/2020
Abstract

Zero-liquid discharge is an emerging wastewater management strategy that maximizes water recovery for reuse and produces a solid waste, thereby lowering the environmental impact of wastewater disposal. Evaporation ponds harvest solar energy as heat for zero-liquid discharge, but require large land areas due to low evaporation rates. Here, we demonstrate a passive and non-contact approach to enhance evaporation by more than 100% using a photo-thermal device that converts sunlight into mid-infrared radiation where water is strongly absorbing. As a result, heat is localized at the water’s surface through radiative coupling, resulting in better utilization of solar energy with a conversion efficiency of 43%. The non-contact nature of the device makes it uniquely suited to treat a wide range of wastewater without contamination, and the use of commercial materials enables a potentially low-cost and highly scalable technology for sustainable wastewater management, with the added benefit of salt recovery.

DOI10.1038/s41893-019-0445-5
Short TitleNat Sustain
Refereed DesignationRefereed