标题：Intensified nitrogen transformation in intermittently aerated constructed wetlands: Removal pathways and microbial response mechanism
作者：Liu, Fei-fei; Fan, Jinlin; Du, Jinhui; Shi, Xia; Zhang, Jian; Shen, Youhao
作者机构：[Liu, Fei-fei] Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Peoples R China.; [Fan, Jinlin; Shi, Xia; Zhang, Jian; Shen, Youhao] Shando 更多
通讯作者：Zhang, Jian;Zhang, J
通讯作者地址：[Zhang, J]Shandong Univ, Shandong Key Lab Water Pollut Control & Resource, Sch Environm Sci & Engn, Jinan 250100, Shandong, Peoples R China.
来源：SCIENCE OF THE TOTAL ENVIRONMENT
关键词：Constructed wetlands; Intermittent aeration; Construction waste;; Microbial mechanism; Nmass balance
摘要：Nitrogen (N) removal processing in vertical flow constructed wetlands (VFCWs) with different designs often varies greatly. Here, a long term VFCWs study for domestic wastewater treatment was carried out to investigate the impact of intermittent aeration and three construction-waste media (common gravel, red brick and fly-ash brick) on N loss, N retention and microbial community. The total nitrogen (TN) removal was significantly higher in aerated VFCWs (91.31%-93.91%) compared with non-aerated VFCWs (12.22%-53.92%), with the highest removal rate in system VI filled with fly-ash brick. Nitrification/denitrification was the main N sink in aerated VFCWs accounting for 36.79%-55.44%, while media storage (8.47%-48.64%) dominated in non-aerated systems because of nitrification limitation. < 16% of the TN removal was uptake by plants, and N2O emission contributed about 0.08%-0.39%. Microbial study found that functional bacteria increased with intermittently aeration. The analysis revealed the crucial influence of oxygen supply and media on N transformations in VFCWs. (c) 2018 Elsevier B.V. All rights reserved.