Ding Weijun, Cheng Shaoan, Yu Liliang, Huang Haobin
State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China.
State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China.
Chemosphere. 2017 Sep;182:567-573. doi: 10.1016/j.chemosphere.2017.05.006. Epub 2017 May 16.
Microbial fuel cells (MFCs) provide a cost-effective method for treating swine wastewater treatment and simultaneously producing electricity, yet they need to be combined with other wastewater treatment processes to improve the effluent water quality. In this paper, we constructed single-chamber air-cathode MFCs with a compact configuration for nitrogen and COD removal and high electricity production and combined them with a low-cost flocculation process to discharge higher quality wastewater. We show that MFCs could remove ammonia at a rate of 269.2 ± 0.5 g m d (99.1± 0.1% ammonia removal efficiency) with a maximum power density of 37.5 W m and 21.6% of coulombic efficiency at a 40:60 ratio of raw swine wastewater to denitrification effluent of swine wastewater. Up to 82.5 ± 0.5% COD could be removed with MFCs, from 2735 ± 15 mg L to 480 ± 15 mg L, and flocculation further reduced levels to 90 ± 1 mg L for a 96.6 ± 0.2% overall COD removal efficiency of the combination technology. Cost analysis of the combined MFC and flocculation process showed a net economic benefit of $ 0.026 m. In summary, this novel combination wastewater treatment method provides an effective way to treat swine wastewater to low pollutant levels in the effluent at low cost (a net gain).
微生物燃料电池（MFCs）为处理猪废水并同时发电提供了一种经济高效的方法，然而它们需要与其他废水处理工艺相结合以改善出水水质。在本文中，我们构建了结构紧凑的单室空气阴极MFCs用于脱氮和去除化学需氧量（COD）以及高效发电，并将它们与低成本絮凝工艺相结合以排放质量更高的废水。我们发现，在原猪废水与猪废水反硝化出水比例为40:60时，MFCs能够以269.2±0.5 g m⁻³ d⁻¹的速率去除氨（氨去除效率为99.1±0.1%），最大功率密度为37.5 W m⁻²，库仑效率为21.6%。MFCs能够去除高达82.5±0.5%的COD，将其从2735±15 mg L⁻¹降至480±15 mg L⁻¹，絮凝进一步将其水平降至90±1 mg L⁻¹，组合技术的总COD去除效率为96.6±0.2%。MFC与絮凝工艺组合的成本分析显示净经济效益为0.026万美元。总之，这种新型组合废水处理方法提供了一种低成本（净收益）将猪废水处理至低污染物水平出水的有效途径。
