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Effects of a constructed wetland and pond system upon shallow groundwater quality

机译：人工湿地和池塘系统对浅层地下水水质的影响

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Constructed wetland (CW) and constructed pond (CP) are commonly utilized for removal of excess nutrients and certain pollutants from stormwater. This study characterized shallow groundwater quality for pre- and post-CW and CP system conditions using data from monitoring wells. Results showed that the average concentrations of groundwater phosphorus (P) decreased from pre-CW to post-CW but increased from pre-CP to post-CP. The average concentrations of groundwater total Kjeldahl nitrogen and ammonium (M/J) increased from pre-CW (or CP) to post-CW (or CP), whereas the average concentrations of ground-water arsenic (As), chromium, nickel, and zinc (Zn) decreased from pre-CW to post-CW regardless of the well locations. Variations of groundwater cadmium, copper, and Zn concentrations were larger in pre-CP than in post-CP and had a tendency to decrease from pre-CP to post-CP. In general, the average concentrations of groundwater aluminum and manganese decreased and of groundwater calcium, iron, magnesium, and sodium increased from pre-CP to post-CP. The average values of water levels (depth from the ground surface), redox potential, and conductance decreased and of chloride and sulfate (SO_4~-2) increased after the-wetland and pond were constructed regardless of the well locations. Results further revealed that there were significant differences (a=0.05) between the pre- and post-CW (or CP) for redox potential, water level, and As. This study suggests that the CW-CP system had discernible effects on some of the shallow groundwater quality constituents. This information is very useful for fully estimating overall performance of stormwater treatment with the CW-CP system.
机译：人工湿地（CW）和人工池塘（CP）通常用于去除雨水中的过量养分和某些污染物。这项研究使用来自监测井的数据来表征连续水处理前后和CP系统条件下的浅层地下水水质。结果表明，从连续水处理前到连续水处理后，地下水中磷的平均浓度降低了，但从循环前到循环后均增加了。地下水中总凯氏氮和铵的平均浓度（M / J）从连续水处理前（或CP）到连续水处理后（或CP），而地下水中砷（As），铬，镍，不管井的位置如何，锌（Zn）从连续水处理前到连续水处理后都减少了。 CP之前的地下水中镉，铜和锌的浓度变化比CP后更大，并且有从CP之前到CP后减少的趋势。通常，从CP前到CP后，地下水铝和锰的平均浓度降低，而地下水钙，铁，镁和钠的平均浓度增加。无论湿井和池塘的位置如何，在建造湿地和池塘之后，水位（距地面深度），氧化还原电势和电导的平均值均降低，而氯化物和硫酸盐（SO_4〜-2）的平均值均升高。结果进一步表明，CW前后（或CP）之间的氧化还原电势，水位和As存在显着差异（a = 0.05）。这项研究表明，CW-CP系统对某些浅层地下水水质成分具有明显的影响。该信息对于完全估计使用CW-CP系统的雨水处理的整体性能非常有用。

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