Performance of pilot-scale vertical-flow constructed wetlands in responding to variation in influent C/N ratios of simulated urban sewage.
The performance response of planted and the unplanted wetlands to simulated wastewater with different ratios of carbon to nitrogen (C/N) was studied during a 9-month period in greenhouse conditions. With different C/N ratios for influent water (C/N ratios 2.5:1, 5:1 and 10:1), average removal efficiencies for the unplanted and the planted wetlands were as follows: COD (41-52% and 59-68%), TN (24-48% and 25-62%), TP (35-64% and 59-71%) and TOC (22-37% and 16-33%). At C/N 5:1, both systems performed most efficiently for removal of COD and TP. However, high N removal efficiency only occurred when C/N ratio ranged 2.5-5. Both wetlands exhibited good capabilities of total organic carbon removal at C/N 10:1. Maybe, appropriate control of the carbon or nitrogen source concentration and C/N ratio in the influent can achieve the optimal effect of nutrients removal.
State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210093, China.
Yong Jun
YJ
Zhao
Bo
B
Liu
Wen Guang
WG
Zhang
Yan
Y
Ouyang
Shu Qing
SQ
An
D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000737:chemistry*; D002947:Cities; D004867:Equipment Design; D031561:Lythrum / Q000201:enzymology; D009584:Nitrogen / Q000737:chemistry*; D009930:Organic Chemicals; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods; D053833:Wetlands
D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen; D010100:Oxygen