Redox potential dynamics in a horizontal subsurface flow constructed wetland for wastewater treatment: Diel, seasonal and spatial fluctuations
Redox potential dynamics in a horizontal subsurface flow constructed wetland for wastewater treatment: Diel, seasonal and spatial fluctuations
复制标题
DOI：
10.1016/j.ecoleng.2008.08.008
复制
发表时间：
2008-10
影响因子：
3.8
通讯作者：
J. Dušek;T. Picek;H. Čížková
中科院分区：
文献类型：
--
作者：
J. Dušek;T. Picek;H. Čížková
采用潜流水平流人工湿地处理城市污水，测定了处理床内的氧化还原电位。CW位于捷克共和国，设计容量相当于150人;它种植了芦苇，并于2001年投入使用。该系统对有机污染物（BOD 582%、COD 74.0%）、氮（62.6%）、磷（75.4%）和悬浮物（52%）的去除率较高。氧化还原电位（EH）测量在两个深度（0.2和0.5米）的治疗床在定期的距离流入使用铂电极，连续，每15分钟在一个超过2年的时间（27个月），从2002年至2004年。EH范围为-400 ~800 mV。在离入流最远距离（13 m）的上层（0.2 m）中波动最强烈，并且EH在很短的时间段（小时）内变化数百毫伏。在影响污染物浓度的因素中，确定了孔隙水温度和水流量。以矿物基质为填料的潜流水平流人工湿地的植被处理床是一个动态系统，其氧化还原状态在短时间内由厌氧变为好氧，反之亦然。厌氧条件不一定在处理床的上层占主导地位，其中存在植物根。
Redox potential was measured in a treatment bed of a constructed wetland (CW) with subsurface horizontal flow used for municipal wastewater treatment. CW was situated in the Czech Republic, designed for 150 person equivalents; it was planted with Phragmitesaustralis and put into operation in 2001. The system was very efficient in removing organic pollution (BOD582% and COD 74.0%), nitrogen (62.6%), phosphorus (75.4%) and suspended solids (52%). Redox potential (EH) was measured in two depths (0.2 and 0.5m) of the treatment bed at regular distances from inflow using platinum electrodes, continuously, every 15min during a more-than-2-year period (27 months) from 2002 to 2004. EHranged from −400 to +800mV. The fluctuations were the most intense in the upper layer (0.2m) at the furthest distance from inflow (13m) and EHchanged within very short time periods (hours) by several hundred millivolts. Among the factors affecting EHconcentrations of pollutants, pore water temperature and water flow rate were determined. Vegetated treatment beds of subsurface horizontal flow constructed wetlands filled with mineral substrate can be extremely dynamic systems, in which oxidation–reduction status changes within short time from anaerobic to aerobic and vice versa. Anaerobic conditions do not prevail necessarily in the upper layer of treatment bed, in which plant roots are present.