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

页码：395 / 402

页数：8

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