阐明进水污染物负荷对农业废弃物人工湿地处理低 C/N 废水时污染物去除的影响。
Elucidating the impact of influent pollutant loadings on pollutants removal in agricultural waste-based constructed wetlands treating low C/N wastewater.
机构信息
College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
出版信息
Bioresour Technol. 2019 Feb;273:529-537. doi: 10.1016/j.biortech.2018.11.044. Epub 2018 Nov 12.
In this study, the common agricultural wastes (wheat straw, apricot pit and walnut shell) were exploited as the potential organic substrates in subsurface flow CWs (SSFCWs) with intermittent aeration to investigate the impacts of the varied influent loadings on the removal performance of pollutants. The results indicated that an application of agricultural wastes in CWs presented the different role in improving removal efficiency as influent pollutant loadings increased. In middle and high influent pollutant loadings, CWs with walnut shell strengthened the denitrification process significantly, and could achieve preferable purification of COD (97.36%), NH-N (98.83%), TN (51.78%), and TP (80.33%), respectively. However, NO emission fluxes were higher in CWs with agricultural biomass and increased clearly as the influent pollutant loadings increasing. The results indicated that combination of agricultural material addition and aeration could be an appropriate intensifying strategy in SSFCWs especially for treating medium-strength low-carbon wastewaters.
在这项研究中，我们利用常见的农业废弃物（麦秆、杏仁核和核桃壳）作为潜流人工湿地（SSFCWs）中的潜在有机基质，并采用间歇曝气方式，以考察不同进水负荷对污染物去除性能的影响。结果表明，随着进水污染物负荷的增加，农业废弃物在 CWs 中的应用呈现出不同的作用，从而改善去除效率。在中高进水污染物负荷下，核桃壳强化了反硝化过程，对 COD（97.36%）、NH-N（98.83%）、TN（51.78%）和 TP（80.33%）的净化效果较好。然而，农业生物质添加和曝气的组合会导致 CWs 中的 NO 排放通量更高，并且随着进水污染物负荷的增加而明显增加。结果表明，农业材料添加和曝气的组合可以作为 SSFCWs 的一种适当强化策略，特别是用于处理中强度低碳废水。
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