ABSTRACT

This study focuses on understanding the role of passive wastewater treatment (wastewater lagoon plus wetland) in reducing the phosphorus discharge levels in a northern small community in Manitoba, Canada. The facultative lagoon system of that small community treats domestic wastewater and seasonally discharges effluent into a wetland that connects to Lake Manitoba. This research assesses phosphorus removal efficiency through the natural wetland during the vegetation growing season. The average total phosphorus (TP) concentration reduction for the observed treatment area of 1.3 ha was more than 70%, achieving the desired TP discharge concentration below 1 mg/L. Data analysis showed that the main accumulation of TP occurred at the 21–40 cm soil depth, which indicates the potential of natural wetland treatment applications under cold continental climate conditions as an effluent polishing step to satisfy regulatory requirements for phosphorus reduction.

摘要

本研究的重点是了解被动废水处理（废水泻湖加湿地）在降低加拿大马尼托巴北部小社区磷排放水平方面的作用。那个小社区的兼性泻湖系统处理生活废水，并按季节将污水排放到与马尼托巴湖相连的湿地中。本研究评估了植被生长季节期间天然湿地的除磷效率。观察到的 1.3 公顷处理区域的平均总磷 (TP) 浓度降低超过 70%，实现了低于 1 毫克/升的目标总磷排放浓度。数据分析表明，TP 的主要积累发生在 21-40 厘米的土壤深度，这表明在寒冷的大陆性气候条件下，天然湿地处理应用作为污水处理步骤以满足减磷监管要求的潜力。