Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, Hong Kong Special Administrative Region.
Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea.
Bioresour Technol. 2022 Aug;357:127312. doi: 10.1016/j.biortech.2022.127312. Epub 2022 May 13.
The addition of external carbon sources is crucial for effective biological treatment of nutrient-rich but carbon-depleted hydroponic wastewater using constructed wetlands. In this study, we examined the effects of applying three types of carbon substrates, namely sucrose, hydroponic kale residues, and common reed litter, on the nutrient removal efficiency and greenhouse gas emission rate of vertical flow constructed wetlands. The addition of sucrose and common reed litter was shown to perform equally well in enhancing the removal of total nitrogen (84.9-93.5%), nitrate (98.3-99.8%) and phosphate (53.8-55.2%) as compared to the control. Moreover, the application of common reed litter led to significantly lower mean CH and NO emissions than that of kale residues. These findings suggested that Phragmites reed litter, which is easily found in wetlands worldwide, could be an effective, low-cost and climate-friendly carbon substrate to be applied in constructed wetlands for hydroponic wastewater treatment.
在利用人工湿地对富营养但贫碳的水培废水进行有效生物处理时，添加外部碳源至关重要。本研究考察了三种碳源（蔗糖、水培羽衣甘蓝残渣和芦苇屑）对垂直流人工湿地的养分去除效率和温室气体排放速率的影响。与对照组相比，添加蔗糖和芦苇屑均能同样有效地提高总氮（84.9-93.5%）、硝酸盐（98.3-99.8%）和磷酸盐（53.8-55.2%）的去除率。此外，芦苇屑的应用导致 CH 和 NO 的平均排放量明显低于羽衣甘蓝残渣。这些发现表明，芦苇屑作为一种在世界各地湿地中很容易找到的材料，可以作为一种有效的、低成本的、对气候友好的碳源，应用于水培废水处理的人工湿地中。
