4.7 Article

All-day freshwater production enabled by an active continuous sorption-based atmospheric water harvesting system

Journal

ENERGY CONVERSION AND MANAGEMENT
Volume 264, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2022.115745

Keywords

Continuous sorption-based atmospheric water harvesting (AC-SAWH); Composite adsorbent; Large-scale water harvester; All-day water production; Two sorbent beds

Funding

  1. South China Institute of Oceanology, Chinese Academy of Sciences [51922070]
  2. National Natural Science Foundation of China

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Recent research has shown that sorption-based atmospheric water harvesting (SAWH) is an effective and low-cost method to address the water crisis. However, the low daily water productivity of devices has limited their practical use. In this study, we developed a continuous SAWH device with optimized sorbent bed structure, which achieved a high water productivity and showed promise for personal/household utilization in islands.
Recent researches have demonstrated sorption-based atmospheric water harvesting (SAWH) as a sustainable, energy-efficient, and low-cost strategy to alleviate the water crisis. But the low daily water productivity of devices (L/kg day(-1)) remains a bottleneck to achieve efficient water production as they are merely allowed for intermittent operation. This limitation makes it rather challenging to deploy discontinuous SAWH systems for practical water production at large scales. Herein, we fabricated an active continuous SAWH (AC-SAWH) device with optimized sorbent bed structure. By configuring two sorbent beds and using nano-porous adsorbent by confining lithium chloride in silica sol modified activated carbon fiber felt (ASLI) as atmospheric water adsorbents, such a novel design enables water production in a continuous mode, delivering a water productivity of 8.3 kg day(-1) or 0.67 kg h(-1) at a regeneration temperature of 90 ?, with a thermal efficiency of 32.6%. This is the first exploration in continuous water production with a large-scale SAWH device, meeting personal drinking water demand of 5 L day(-1) and demonstrating a promising water productivity for personal/household utilization in islands. With its excellent all-day freshwater harvesting performance and a scalable process, this continuous SAWH system is potential to make a contribution to the global water-energy-climate nexus.

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