Seasonal effect on ammonia nitrogen removal by constructed wetlands treating polluted river water in southern Taiwan
Seasonal effect on ammonia nitrogen removal by constructed wetlands treating polluted river water in southern Taiwan
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DOI：
10.1016/s0269-7491(03)00267-7
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发表时间：
2004-01-01
影响因子：
8.9
通讯作者：
Lin, YF
中科院分区：
文献类型：
--
作者：
Jing, SR;Lin, YF
采用自由水面湿地和地下湿地串联的中试规模人工湿地（CW）系统净化高污染河水。各组分的浓度随季节变化。根据1998年6月至2000年2月的数据，在恒定水力负荷率下，研究了温度、质量负荷率和进水盐度等季节性参数对湿地系统去除氨氮（AN）的影响。CW的去除随季节呈周期性变化。去除效率和一级体积去除速率常数（k（V））随水温呈指数增加，温度系数（0）较大。然而，质量去除率随温度的升高呈指数下降。这些相互矛盾的结果使得温度的实际影响不确定。高盐度对AN去除的抑制作用也不清楚，因为k（V）（以及k（V20））和质量去除率与盐度成反比。然而，质量负荷率（MLR）的主要影响去除效率和AN的质量去除率，这两个因素，明确地决定了季节性。提出了一个幂函数方程k（v ~（20））a MLR ~（-1），用于修正人工湿地设计中的负荷率变化。(C)2003爱思唯尔有限公司。保留所有权利。
A pilot-scale constructed wetland (CW) system, combining a free water surface wetland and a subsurface wetland in series, was used to purify highly polluted river water. The concentrations of constituents varied seasonally. The effects of season-dependent parameters, such as temperature, mass loading rate and inflow salinity, on the removal of ammonia nitrogen (AN) in the wetland system were examined at a constant hydraulic loading rate, based on data from June 1998 to February 2000. AN removal of the CW varied cyclically with the seasons. The removal efficiency and the first-order volumetric removal rate constant (k(V)) increased exponentially with water temperature, yielding a high temperature coefficient (0). However, the mass removal rate decreased exponentially as temperature increased. These contradictory results made the actual effect of temperature uncertain. The inhibition of high water salinity on AN removal was also unclear because k(V) (as well as k(V20)) and mass removal rate were inversely proportional to salinity. However, mass loading rate (MLR) predominantly affected both the removal efficiency and the mass removal rate of AN, both of which were factors that explicitly determined seasonality. A power equation, k(v20)' a MLR-n, was proposed to correct the variation of the mass loading rate in estimating k(V) and thus in designing a constructed wetland. (C) 2003 Elsevier Ltd. All rights reserved.