所属单位：

环境与市政工程学院

发表刊物：

Environ Sci Pollut Res

关键字：

中文关键字：Constructed wetland . Pollution . Urban river rest，英文关键字：Constructed wetland . Pollution . Urban river rest

摘要：

Hybrid constructed wetland (HCW) systems have been used to treat various wastewaters across the world. However, large-scale applications of HCWs are scarce, particularly for on-site improvement of the water quality of highly polluted urban rivers in semi-arid regions. In this study, a large pilotscale HCW system was constructed to improve the water quality of the Zaohe River in Xi’an, China. With a total area of about 8000 m2, the pilot HCW system, composed of different configurations of surface and subsurface flow wetlands, was operated for 2 years at an average inflow volume rate of 362 m3/day. Local Phragmites australis and Typha orientalis from the riverbank were planted in the HCWsystem. Findings indicate a higher treatment efficiency for organics and suspended solids than nutrients. The inflow concentrations of 5-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD), suspended solids (SS), total nitrogen (TN), NH3-N, and total phosphorus (TP) were 125.6, 350.9, 334.2, 38.5, 27.2, and 3.9 mg/L, respectively. Average removal efficiencies of 94.4, 74.5, 92.0, 56.3, 57.5, and 69.2 %, respectively, were recorded. However, the pollutant removal rates were highly seasonal especially for nitrogen. Higher removals were recorded for all pollutants in the autumn whilesignificantly lower removals were recorded in the winter. Plant uptake and assimilation accounted for circa 19–29 and 16–23 % of the TN and TP removal, respectively. Moreover, P. australis demonstrated a higher nutrient uptake ability and competitive potential. Overall, the high efficiency of the pilot HCWfor improving the water quality of such a highly polluted urban river provided practical evidence of the applicability of the HCW technology for protecting urban water environments.

备注：

王晓昌

合写作者：

MawuliDzakpasu,葛媛,赵亚乾

第一作者：

熊家晴,王晓昌,郑于聪

论文类型：

期刊论文

卷号：

卷：

期号：

期：

页面范围：

页：

是否译文：

否

发表时间：

2015-08-01