Authors: Ming Xu Weijing Liu Chao Li Chun Xiao Lili Ding Ke Xu Jinju Geng Hongqiang Ren
Publish Date: 2016/02/23
Volume: 23, Issue: 11, Pages: 10990-11001
Abstract
Constructed wetlands are ecosystems that use plants and microorganisms to remediate pollution in soil and water In this study two parallel pilotscale vertical flow wetland and horizontal flow wetland VFHF systems were implemented to investigate the treatment performance and microorganism community structure in the secondary effluent of an industrial park wastewater treatment plant WWTP with a loading rate of 100 mm/day near the Yangtze River in Suzhou City East China Removal efficiencies of 823 698 778 and 323 were achieved by the VFHF systems for ammonium nitrogen NH4 +N total nitrogen TN total phosphorus TP and chemical oxygen demand COD respectively The VF system specialized in COD and NH4 +N removal 736 and 792 whereas the HF system mainly contributed to TN removal 635 The effluents in all seasons are capable of achieving the “surface water environmental quality standard” GB38382002 grade IV In the VF system the 16S gene and nirK gene were significantly correlated with depth with the 16S gene showing significant correlations with the dissolved oxygen DO level r = 0954 p 005 which was determined by realtime PCR and highthroughput sequencing Many types of bacteria capable of biodegradation including nitrifiers denitrifiers and polyaromatic hydrocarbon PAH degraders improvement of the BOD5/COD ratio were observed and they contributed to approximately 90 of the nitrogen removal in the VFHF systemThe authors wish to thank the Jiangsu Province Key Laboratory of Environmental Engineering Grant NoZX2014001 and the Advanced Treatment and Reclamation of Eutrophic Pollutants in Park Industrial Wastewater Technology and Demonstration 2012ZX07101003
Keywords: