Abstract
As a byproduct of desalination plants, brine is increasingly becoming a threat to the environment, and the design of zero-liquid discharge
desalination (ZLDD) systems is gaining increasing attention. Existing ZLDD systems are limited by a high energy intensity and high plant costs of their crystallizers. This study proposes a novel crystallization method based on the humidification-dehumidification (HDH) process, which exhibits the advantages of a low energy consumption, low component costs and a reduced scaling and fouling potential. A simple experimental setup is first designed to demonstrate the feasibility of the proposed system. Brine concentration and salt crystallization are successfully achieved with air heated to 40 ℃ as the heat source. Afterwards, a thermo-economic analysis is conducted for the whole system. The specific thermal energy and electricity consumption levels are found to range from 700-900 and 5-11 kJ, respectively, per kg of feed brine. The energy consumption is 56% lower than that of a conventional evaporative crystallizer, and the initial plant cost is reduced by 58%. Keywords: zero-liquid discharge desalination; crystallization; humidification-dehumidification.
Original language | English (US) |
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Pages (from-to) | 117794 |
Journal | Water Research |
DOIs | |
State | Published - Oct 25 2021 |
Bibliographical note
KAUST Repository Item: Exported on 2021-10-27Acknowledgements: This research was supported by the Water Desalination and Reuse Center (WDRC), King Abdullah University of Science and Technology (KAUST).
ASJC Scopus subject areas
- Water Science and Technology
- Pollution
- Ecological Modeling
- Waste Management and Disposal