College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
Bioresour Technol. 2017 Oct;241:269-275. doi: 10.1016/j.biortech.2017.05.072. Epub 2017 May 15.
Recently, vertical flow constructed wetlands (VFCWs) with intermittent aeration have been proven as an efficient technology to enhance removal efficiency of organics and nitrogen for wastewater treatment. However, the low denitrification effect in VFCWs was a problem for treating low carbon source wastewater. In this study, intermittent aeration and biochar, produced by biomass pyrolysis, was used to promote the nitrogen removal in VFCWs for low C/N domestic wastewater. Four systems, including non-aerated with non-biochar VFCW, non-aerated with biochar VFCW, aerated with non-biochar VFCW and aerated with biochar VFCW, were conducted for comparing their treatment performances. The results showed that much higher removal of COD (94.9%), NH-N (99.1%), TN (52.7%) and lower NO emission (60.54μg·m·h) was obtained in aerated VFCW with biochar addition. The results suggested that adding biochar to intermittent aerated VFCWs could be an effective and appropriate strategy for low C/N wastewater treatment.
最近，间歇曝气垂直流人工湿地（VFCWs）已被证明是一种有效提高有机物和氮去除效率的技术，可用于处理废水。然而，VFCWs 中的低反硝化效果是处理低碳源废水的一个问题。在这项研究中，使用间歇曝气和生物质热解产生的生物炭来促进 VFCWs 中低 C/N 生活污水的氮去除。为了比较它们的处理性能，共运行了四个系统，包括非曝气无生物炭 VFCW、非曝气有生物炭 VFCW、曝气无生物炭 VFCW 和曝气有生物炭 VFCW。结果表明，曝气添加生物炭的 VFCW 对 COD（94.9%）、NH-N（99.1%）、TN（52.7%）的去除率更高，NO 排放量更低（60.54μg·m·h）。结果表明，向间歇曝气 VFCWs 中添加生物炭可能是处理低 C/N 废水的一种有效且合适的策略。
