Department of Civil & Environmental Engineering, Kongju National University, 275 Budae-dong, Cheonan, Chungnamdo 330-717, Korea.
Water Sci Technol. 2013;67(6):1317-23. doi: 10.2166/wst.2013.002.
The surface-flow constructed wetland (CW) located in Nonsan City, South Korea, and constructed as the final stage of a piggery wastewater treatment plant that aims to treat high nutrient content effluent during dry days and stormwater runoff during wet days was monitored from October 2008 to November 2011. This research investigated the seasonal nutrient uptake of plant biomass in the CW and nutrient concentration changes in each treatment region under monsoon and temperate climate conditions. Results showed that the mean total nitrogen removal during summer (June to August) was higher by 13% than in spring (March to May), while total phosphorus removal was higher by 22% in fall (September to November) than in winter (December to February). All plants in the CW reached their maximum biomass coverage and weight in summer and minimum growth in winter. The highest N and P content in plants occurred in September with 583.2 g/m(2) and August with 62.0 g/m(2), respectively. Based on the results, it is recommended that the harvesting of plants should be conducted during the time of the peak nutrient uptake and before the plants release the nutrient content back to the CW. The dependence of nutrient removal efficiency on plants is not so significant. In order to increase the nutrient removal rate by plant uptake, it is suggested that the treatment regions in the CW be covered by plants.
位于韩国论山市的表面流人工湿地（CW）是养猪场废水处理厂的最后阶段，旨在处理旱天的高营养含量废水和雨天的雨水径流。该人工湿地自 2008 年 10 月至 2011 年 11 月进行了监测。本研究调查了 CW 中植物生物量的季节性养分吸收情况，以及季风和温带气候条件下每个处理区的养分浓度变化。结果表明，夏季（6 月至 8 月）的总氮去除率平均比春季（3 月至 5 月）高 13%，而秋季（9 月至 11 月）的总磷去除率比冬季（12 月至 2 月）高 22%。CW 中的所有植物在夏季达到最大生物量覆盖和重量，在冬季达到最小生长。植物中氮和磷的含量最高分别出现在 9 月，为 583.2 g/m²，8 月为 62.0 g/m²。根据研究结果，建议在植物吸收养分的高峰期和植物将养分释放回 CW 之前进行植物收割。对植物去除效率的依赖并不那么显著。为了提高植物吸收的养分去除率，建议 CW 的处理区被植物覆盖。
