2023-05-15 米国国立再生可能エネルギー研究所(NREL)
◆NRELの研究者が、低塩反転浸透逆浸透という新しい水処理システムのコスト、浄水量、エネルギー消費量を迅速に評価する数学モデルを設計しました。このシステムは、廃水などの塩分を含む水を飲用水に再利用することができます。130,000以上の潜在的なシステム設計のコスト、浄水量、エネルギー消費量を評価することができる数学モデルを開発しました。その結果、低塩反転浸透逆浸透は多くの場合、最も費用対効果の高い選択肢であり、清潔な水の生産コストを最大で63%削減できる可能性が示されました。
＜関連情報＞
- https://www.nrel.gov/news/program/2023/new-water-treatment-technology-could-help-recycle-even-super-salty-waters.html
- https://www.sciencedirect.com/science/article/abs/pii/S0011916423000395?via%3Dihub#f0030
塩分除去率の低い逆浸透膜のコスト最適化 Cost optimization of low-salt-rejection reverse osmosis
Adam A. Atia, Jeff Allen, Ethan Young, Ben Knueven, Timothy V. Bartholomew
Desalination Available online: 1 February 2023
DOI:https://doi.org/10.1016/j.desal.2023.116407
Abstract
Low-salt-rejection reverse osmosis (LSRRO) is an emerging membrane-based desalination technology for concentrating brines with potentially lower energy consumption and cost than thermally driven processes. We assess the technoeconomic performance of LSRRO by using an optimization model that minimizes the levelized cost of water (LCOW). We develop detailed models for the RO module and other equipment using WaterTAP (Water treatment Technoeconomic Assessment Platform), an open-source simulation and optimization software for water treatment. We improve upon previous LSRRO cost optimization studies by optimizing the salt permeability for each stage, which has significant implications for technoeconomic performance. We present the cost-optimal design, operation, and performance for three cases: 35 g/L TDS feed at 70 % recovery, 70 g/L at 55 %, and 125 g/L at 35 %. The cost-optimal LCOW and specific energy consumption (SEC) for these cases are 0.70, 1.89, and 7.41 $/m3 and 3.9, 8.4, and 30.4 kWh/m3, respectively. For each case, we use sensitivity analyses to provide guidance on key factors that impact economic viability. We also present the cost-optimal LCOW and SEC for feed concentrations between 5 and 220 g/L TDS and recoveries between 30 and 90 %. Lastly, we compare LSRRO to other high-salinity desalination technologies and find that it may be cost-competitive below feed concentrations of 125 g/L.
