Enhanced nitrogen removal in constructed wetlands: Effects of dissolved oxygen and step-feeding

被引：108
作者：
Li, Fengmin [1 ]
Lu, Lun [1 ]
Zheng, Xiang [2 ]
Huu Hao Ngo [3 ]
Liang, Shuang [4 ]
Guo, Wenshan [3 ]
Zhang, Xiuwen [1 ]
机构：
[1] Ocean Univ China, Minist Educ, Key Lab Marine Environm Sci & Ecol, Qingdao 266100, Peoples R China
[2] Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China
[3] Univ Technol Sydney, Sch Civil & Environm Engn, Broadway, NSW 2007, Australia
[4] Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Jinan 250100, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2014年 / 169卷
关键词：
Constructed wetland; Dissolved oxygen; Step-feeding; Nitrification; Denitrification; HORIZONTAL SUBSURFACE FLOW; WASTE-WATER; SPECIES RICHNESS; AERATION; ORGANICS; DENITRIFICATION; EXPERIENCE; STRATEGY; CLIMATE; SYSTEM;
D O I：
10.1016/j.biortech.2014.07.004
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Four horizontal subsurface flow constructed wetlands (HSFCWs), named HSFCW1 (three-stage, without step-feeding), HSFCW2 (three-stage, with step-feeding), HSFCW3 (five-stage, without step-feeding) and HSFCW4 ( five-stage, with step-feeding) were designed to investigate the effects of dissolved oxygen (DO) and step-feeding on nitrogen removal. High removal of 90.9% COD, 99.1% ammonium nitrogen and 88.1% total nitrogen (TN) were obtained simultaneously in HSFCW4 compared with HSFCW1-3. The excellent TN removal of HSFCW4 was due to artificial aeration provided sufficient DO for nitrification and the favorable anoxic environment created for denitrification. Step-feeding was a crucial factor because it provided sufficient carbon source (high COD: nitrate ratio of 14.3) for the denitrification process. Microbial activities and microbial abundance in HSFCW4 was found to be influenced by DO distribution and step-feeding, and thus improve TN removal. These results suggest that artificial aeration combined with step-feeding could achieve high nitrogen removal in HSFCWs. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：395 / 402
页数：8
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