首页> 外文会议>Second International Conference on Wetlands amp; Remediation, Sep 5-6, 2001, Burlington, Vermont >FIELD STUDIES OF ENHANCED PHOSPHORUS REMOVAL FROM CONSTRUCTED WETLAND EFFLUENTS
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FIELD STUDIES OF ENHANCED PHOSPHORUS REMOVAL FROM CONSTRUCTED WETLAND EFFLUENTS

机译:人工湿地废水中强化除磷的现场研究

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摘要

Two adsorptive media, a blast furnace slag and a cement clinker are investigated for their capacity to remove phosphorus in a subsurface wetland. The field studies are being conducted at Sunny Creek Estates (SCE) mobile home park near Trenton, Ontario (100 km west of Kingston), which currently treats its wastewater with two aerated lagoons followed by a constructed wetland. The results from this study will provide recommendations for improving phosphorus removal at the SCE constructed wetland, in addition to valuable information for new and existing constructed wetlands in cold climate areas. Three unplanted gravel filters, two containing adsorptive media and one serving as a control (using the same medium present in the wetland), have been installed as a post wetland polishing treatment prior to final effluent discharge. The adsorptive media are present as a fixed percentage in a mixture of fine stone and the adsorptive media. All filters are 3 m long, 0.6 m wide and 0.7 m deep, and each receives a portion of the constructed wetland effluent. Three monitoring wells have been installed along the transect of each filter. Samples are taken from a number of points in each filter, and are analyzed for phosphorus, pH and temperature. The filters were commissioned in July 2000, and data gathering continued until July 2001, to provide a year-round data set. The slag filter had consistently the lowest outflow dissolved phosphorus concentrations (0.27+-0.08 mg/L, n=21), whereas the clinker filter had the greatest outflow dissolved phosphorus concentrations (0.72+-0.20 mg/L, n=23). The clinker performed well below expectations, possibly due to lower pH conditions than observed in the lab. The filters maintained relatively constant outflow concentrations, despite varying input conditions and times of phosphorus export. Export of phosphorus occurred in the winter, although it is attributed to the decrease in input phosphorus concentrations below the maintained outflow concentrations, rather than cold temperatures or failure of the bed. In addition to providing recommendations for retrofitting the constructed wetland at SCE, the field studies provide regional information for new constructed wetlands and retrofits for existing wetlands experiencing similar performance limitations.
机译:研究了两种吸附介质,高炉矿渣和水泥熟料在地下湿地中去除磷的能力。现场研究是在安大略省特伦顿(金斯敦以西100公里)附近的Sunny Creek Estates(SCE)移动房屋公园进行的,该公园目前用两个充气泻湖和一个人工湿地处理废水。这项研究的结果,除了为寒冷地区的新的和现有的人工湿地提供有价值的信息外,还将为改善SCE人工湿地除磷提供建议。在最终排放废水之前,已安装了三个未植入的砾石过滤器,其中两个包含吸附性介质,一个用作对照(使用湿地中存在的相同介质),作为湿地后抛光处理。吸附介质以固定百分比的形式存在于细石和吸附介质的混合物中。所有的过滤器长3 m,宽0.6 m,深0.7 m,每个过滤器都接收一部分人工湿地污水。沿每个过滤器的横断面安装了三个监测井。从每个过滤器中的多个点取样,并对磷,pH和温度进行分析。筛选器于2000年7月投入使用,数据收集一直持续到2001年7月,以提供全年的数据集。渣过滤器始终具有最低的流出溶解磷浓度(0.27 + -0.08 mg / L,n = 21),而熟料过滤器具有最大的流出溶解磷浓度(0.72 + -0.20 mg / L,n = 23)。熟料的性能远低于预期,可能是由于pH条件低于实验室所观察到的缘故。尽管输入条件和磷出口时间不同,但过滤器仍保持相对恒定的流出浓度。磷的出口发生在冬季,尽管这归因于输入磷的浓度降低到低于维持的流出浓度,而不是由于低温或床失灵。除了为SCE的人工湿地翻新提供建议外,实地研究还为新建人工湿地提供了区域信息,并对性能受到类似限制的现有湿地进行了翻新。

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