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Effect of thermal characteristics on the chemical quality of real-brine treatment through hydrophilic fiber-based low-grade heat-powered humidification-dehumidification process

Authors
Santosh, RavichandranLee, Ho-SaengJi, HoKim, Young-Deuk
Issue Date
4월-2023
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Brine treatment; Minimal liquid discharge; Low-grade heat utilization; Humidification-dehumidification; Thermodynamics-chemical quality nexus
Citation
WATER RESEARCH, v.233
Journal Title
WATER RESEARCH
Volume
233
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/9495
DOI
10.1016/j.watres.2023.119771
ISSN
0043-1354
1879-2448
Abstract
Considering the increasing demand for desalination plants and their byproduct brine, this study investigated a humidification-dehumidification (HDH) system for treating membrane distillation-generated real high-salinity brine using low-grade heat (45-70 degrees C) to explore its feasibility for sustainable energy-efficient minimal liquid discharge. A novel super-hydrophilic fabric was adopted for accelerated humidification, and its impact on brine droplet miscarriage characteristics was evaluated. The influence of the operating fluid thermal properties (cycle 1: air preheating; cycle 2: air and brine dual-fluid preheating; and cycle 3: air post-heating after humidification) on the brine treatment efficiency, energy consumption, and chemical quality of freshwater produced was analyzed in detail to establish their characteristic nexus. It was identified that, during humidification, increasing the brine temperature (up to 55 degrees C) influenced its ionic mobility, thereby promoting efficient separation of the salts/minerals and contributing to achieving better freshwater quality. Furthermore, although cycle 3 exhibited improved system thermal efficiency (gained output ratio equal to 1.77), its non-preheated air contributed to a negative effect of the reduced humidity ratio (-17 g/kg), leading to a lower freshwater productivity of 67% than that of cycle 2 (29 g/kg and 70%). The present study also illustrates a novel effect of evaporative deposition occurring due to air-water interaction on the fabric humidifier surface, with an exploration of its effect on reducing freshwater chemical quality. The freshwater generated from optimum thermal cycle 2 exhibited reduced pH (by-63%), sodium (99.9%), chloride (99.9%), toxic boron (99.7%), and other chemical contami-nants, thereby satisfying the major international water reuse standards.
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친환경해양개발연구본부 (해수에너지연구센터)
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