Nitrogen and Phosphorus Removal in Surface Flow Constructed Wetland Planted with Myriophyllum elatinoides Treating Swine Wastewater in Subtropical Central China

被引：2
|
作者：
Wang L.-S. [1 ,2 ]
Li X. [1 ]
Li Y.-Y. [1 ]
Zhang M.-Y. [1 ]
Wu J.-S. [1 ]
机构：
[1] Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha
[2] University of Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 03期
关键词：
Ecological management; N and P mass balance; Plant uptake; Sediment accumulation; Swine wastewater;
D O I：
10.13227/j.hjkx.202007073
中图分类号：
学科分类号：
摘要：
The loss of nitrogen (N) and phosphorus (P) from aquaculture has caused eutrophication of freshwater systems. Here, surface flow constructed wetland (SFCW) planted with Myriophyllum elatinoides were used to treat swine wastewater from a medium-sized hoggery in subtropical Central China. Inflow concentrations of NH4+-N, TN, TP, and COD ranged from 535.4 to 591.09, 682.09 to 766.96, 57.73 to 82.29, and 918.4 to 1 940.43 mg•L-1, respectively. The mean removal efficiencies of NH4+-N, TN, TP, and COD were 97.4%, 97.1%, 91.0%, and 90.2%, respectively, and CW1 had the largest contributions of 37.3%, 38.4%, 43.3%, and 27.4%, respectively. Plant N and P uptake ranged 23.87-79.96 g•m-2 and 5.34-18.98 g•m-2, accounting for 19.1% and 20.2% of removal, respectively. Sediment N and P accumulation ranged 19.17-56.62 g•m-2 and 10.59-26.62 g•m-2, accounting for 19.8% and 61.7% of removal, respectively. Multiple linear regression showed that environmental factors explained 79.9% of the N removal and 70.1% of the P removal; DO was the main factor affecting N removal, and sediment adsorption was the key process in P removal. These results show that M. elatinoides constructed wetland can efficiently treat swine wastewater, thereby reduce the discharge of pollutants downstream. © 2021, Science Press. All right reserved.
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页码：1433 / 1442
页数：9
相关论文
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