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 (f) and 1 µs pulse width (pw) 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.

中文翻译：

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纳秒脉冲增强低比能耗城市污水处理电凝聚

本研究比较了纳秒脉冲 (NSP) 和直流 (DC) 电源在电凝 (EC) 市政污水处理中的性能。在 EC 过程中，以单极平行配置 (MP-P) 连接的四个铝板用作电极。使用 DC 和 NSP 的最大化学需氧量 (COD) 去除效率分别达到 68% 和 80%。此外，与 DC 相比，NSP 处理降低了约 15% 的比能耗 (SEC)，COD 去除效率约为 68%，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 比使用 DC 时少两到三倍。结果表明，在 10 kHz 频率 (f) 和 1 µs 脉冲宽度 (pw) 下运行的 NSP 更适合在低 SEC 下获得更高的 COD 去除效率。将 NSP 用于 EC 可以提高 COD 去除效率并减少废水处理 SEC。本文提出的结果促进了 EC 系统与可再生能源的结合使用，以减少废水处理的净碳足迹。