Abstract
Abstract The removal of organic pollutants, ammonia, and phosphorus from seriously polluted river water has been extensively explored using various traditional integrated constructed wetland systems. However, the removal efficiency of nitrogen was extremely low due to the limited oxygen concentration of these traditional systems. Herein, a novel pilot-scale integrated constructed wetland system (CWs), which consisted mainly of a biotic contacting oxidization pre-treatment (BCO), an artificial aeration vertical sub-surface flow CWs, and a horizontal subsurface flow CWs were applied to enhance the removal of total nitrogen (TN) under high hydraulic loading through artificial aeration. Results showed that, with the application of the novel CW systems, a total of 64.97% removal of TN was achieved with the average inflow of 11.39 mg/L and hydraulic load of 1.67 m3 ⋅ m−2 ⋅ d−1. Further analysis showed that the contributions of BCO, AVFCWs and HF CWs to TN removal were 13.86%, 15.97% and 35.36%, respectively. Besides the TN removal, the CW systems can also obtained about 75% of ammonia removal, within which artificial aeration vertical subsurface flow CWs unit occupied about 60% of contribution. Flowing by the application of this systems, the concentrations of ammonia and nitrate in the outflow decreased to 2.66 and 2.01 mg/L, respectively. The study indicated that the integrated constructed wetland system applied can be an efficiently potential technique for the removal of COD, NH4-N and TP from some rural wastewater.
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