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	Effects of effluent recirculation in vertical-flow constructed wetland on treatment efficiency of livestock wastewater
	He L. S. ; Liu H. L. ; Xi B. D. ; Zhu Y. B.
	2006
关键词	constructed wetland effluent recirculation swine wastewater vertical-flow
英文摘要	Enhancing the treatment efficiency of livestock wastewater by effluent recirculation is investigated in a pilot-scale vertical-flow constructed wetland. The wetland system is composed of downflow and upflow stages, on which narrow-leaf Phragmites communis and common reed Phragmites typhia are planted, respectively; each stage has a dimension of 4 m(2) (2 m x 2 m). Wastewater from the facultative pond is fed into the system intermittently at a flow rate of 0.4 m(3)/d. Recirculation rates of 0, 25%, 50%, 100% and 150% are adopted to evaluate the effect of the recirculation rate on pollutants removal. This shows that with effluent recirculation the average removal efficiencies of NH4-N, BOD5 and SS obviously increase to 61.7%, 81.3%, and 77.1%, respectively, in comparison with the values of 35.6%, 50.2%, and 49.3% without effluent recirculation. But the improvement of TP removal is slight, only from 42.3% to 48.9%. The variations of NH4-N, DO and oxidation-reduction potential (ORP) of inflow and outflow reveal that the adoption of effluent recirculation is beneficial to the formation of oxide environment in wetland. The exponential relationships with excellent correlation coefficients (R-2 > 0.93) are found between the removal rates of NH4-N and BOD5 and the recirculation rates. With recirculation the pH value of the outflow decreases as the alkalinity is consumed by the gradually enhanced nitrification process. When recirculation rate is kept constant at 100%, the ambient temperature appears to affect NH4-N removal, but does not have significant influence on BOD removal.
出处	Agricultural Economics
卷	54
期	11-12
页	137-146
收录类别	SCI
语种	英语
ISSN号	0273-1223
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/25442]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	He L. S.,Liu H. L.,Xi B. D.,et al. Effects of effluent recirculation in vertical-flow constructed wetland on treatment efficiency of livestock wastewater. 2006.

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