Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China; Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China.
Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China.
Bioresour Technol. 2020 Apr;302:122890. doi: 10.1016/j.biortech.2020.122890. Epub 2020 Jan 25.
Biochar-based subsurface-flow constructed wetlands (CWs) with intermittent aeration (IA) or tidal flow (TF) oxygen supply strategies were established to treat domestic wastewater. The results showed that biochar achieved higher nutrient removal and lower greenhouse gas (GHG) emissions than ceramsite while supporting more diverse bacterial communities and higher abundances of functional taxa. Both IA and TF effectively enhanced nutrient removal, though the latter was more efficient and practical, and aeration conditions greatly influenced nutrient removal efficiency. GHG emissions were decreased by IA but were slightly increased by TF. Both oxygen supply methods significantly shaped the biofilm microbial communities and influenced biodiversity and richness, with observably higher proportions of potential nitrifiers and denitrifiers present in aerated CWs. Overall, biochar-based CWs operated with oxygen supply strategies provide superior treatment of decentralized wastewater.
以生物炭为基础的地下流人工湿地（CWs）采用间歇曝气（IA）或潮汐流（TF）供氧策略来处理生活污水。结果表明，生物炭在支持更多样的细菌群落和更高丰度的功能类群方面，实现了比陶瓷滤料更高的养分去除率和更低的温室气体（GHG）排放量。IA 和 TF 都能有效地提高养分去除率，尽管后者更有效和实用，曝气条件对养分去除效率有很大影响。IA 降低了 GHG 排放，但 TF 略有增加。这两种供氧方式都显著地塑造了生物膜微生物群落，并影响了生物多样性和丰富度，在曝气 CWs 中存在着更高比例的潜在硝化菌和反硝化菌。总的来说，采用供氧策略的基于生物炭的 CWs 为分散式废水处理提供了更好的处理效果。
