Extreme Energy-Density Research Institute, Nagaoka University of Technology, Niigata, Japan.
Department of Civil and Environmental Engineering, Nagaoka University of Technology, Niigata, Japan.
Environ Technol. 2021 Jun;42(14):2154-2162. doi: 10.1080/09593330.2019.1694082. Epub 2019 Nov 21.
This study compares the performance of nanosecond pulse (NSP) and direct current (DC) power supplies for use in a municipal wastewater treatment by electrocoagulation (EC). Four Al plates connected in monopolar-parallel configuration (MP-P) were used as electrodes during the EC process. The maximum chemical oxygen demand (COD) removal efficiency reached 68% and 80% using DC and NSP, respectively. Moreover, NSP treatment reduced approximately 15% of the specific energy consumption (SEC) compared with that by DC at a similar COD removal efficiency of ≈ 68%, which was used as a benchmark value. In addition, when using NSP, the SEC required to increase the COD removal efficiency from 60% to 68% was two to three times less than that when DC was applied. The results suggest that an NSP operating at 10 kHz frequency () and 1 µs pulse width () are preferred for obtaining higher COD removal efficiencies at a low SEC. The use of an NSP for EC can enhance the COD removal efficiency and reduce the wastewater treatment SEC. The results presented herein promote the use of EC systems combined with renewable energy sources for reducing the net carbon footprint of wastewater processing.
本研究比较了纳秒脉冲（NSP）和直流（DC）电源在市政废水处理中的电絮凝（EC）应用中的性能。在 EC 过程中，使用了连接成单极-并联配置（MP-P）的四块 Al 板作为电极。使用 DC 和 NSP 时，最大化学需氧量（COD）去除效率分别达到 68%和 80%。此外，与 DC 相比，在相似的 COD 去除效率（约 68%）下，NSP 处理可将比特定能（SEC）降低约 15%，这被用作基准值。此外，当使用 NSP 时，将 COD 去除效率从 60%提高到 68%所需的 SEC 是应用 DC 时的两到三倍。结果表明，在低 SEC 下获得更高 COD 去除效率时，优选 10 kHz 频率（）和 1 µs 脉冲宽度（）的 NSP 运行。EC 中 NSP 的使用可以提高 COD 去除效率并降低废水处理 SEC。本文的研究结果促进了将 EC 系统与可再生能源结合使用，以降低废水处理的净碳足迹。
