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RSC Adv

Title:		Birnessite-coated sand filled vertical flow constructed wetlands improved nutrients removal in a cold climate
Author(s):		Zhang N; Yang Y; Huang L; Xie H; Hu Z;
Address:		"Environment Research Institute, Shandong University Jinan 250100 China xiehuij@sdu.edu.cn +86-531-8836978 +86-531-88361185. School of Resources and Environment, Linyi University Linyi Shandong 276005 China. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University Jinan Shandong 250100 China"
Journal Title:		RSC Adv
Year:		2019
Volume:		20191104
Issue:		62
Page Number:		35931 - 35938
DOI:		10.1039/c9ra07364g
ISSN/ISBN:		2046-2069 (Electronic) 2046-2069 (Linking)
Abstract:		"At low temperature, plants wither and microbial activities decrease, leading to a decline in the pollutant-treatment performance of constructed wetlands (CWs). In this study, vertical flow CWs (VFCWs) with birnessite (Mn oxides)-coated sand (Mn-CWs) were developed to investigate the pollutant removal performance and mechanism in a cold climate. The results showed that the average removal efficiencies for NH(4)-N, NO(3)-N, TN, and TP were 73.81%, 90.66%, 82.44%, and 57.89% in Mn-CWs, respectively, while the average removal efficiencies for NH(4)-N, NO(3)-N, TN, and TP were 29.07%, 90.40%, 62.80%, and 26.32% in the control, respectively. Mn-CWs enhanced microbial denitrification and matrix storage, as well as inhibited P release in Mn-CWs at low temperature. According to GC-MS analysis of the organic compounds, the Mn-CWs matrix contained much more short-chain volatile organic compounds, such as carboxylic acid derivatives, while the control matrix had more ethyl acetate. The absolute quantities of bacterial 16S rRNA, amoA, narG, nirS, and nosZ were significantly higher than the control at 20 cm height from the bottom (p > 0.05). Illumina high-throughput sequencing analysis revealed that the relative abundances of nitrifying and denitrifying bacteria were both higher in Mn-CWs than that of the control. CWs filled with birnessite-coated sand represent an innovative approach for improving nutrient removal performance in cold climates through chemical absorption and microbial transformation"
Keywords:
Notes:		"PubMed-not-MEDLINEZhang, Ning Yang, Yixiao Huang, Lihua Xie, Huijun Hu, Zhen eng England 2019/11/04 RSC Adv. 2019 Nov 4; 9(62):35931-35938. doi: 10.1039/c9ra07364g. eCollection 2019 Nov 4"