アシ植栽人工湿地における排水処理特性およびAGPによる機能評価

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  • Effect of Constructed Wetland Structure on Wastewater Treatment and Its Evaluation by Algal Growth Potential Test

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The enrichment of lakes, inland seas, groundwater and rivers by nutrients such as nitrogen and phosphorus compounds, and their consequences is one of the most severe problems across the world. Transfer of nutrients from different sources into the environment causes eutrophication of surface waters, nitrate accumulation in groundwater, and others. Domestic wastewater is an important nitrogenous and phosphorous source. Among the treatment technologies for it, constructed wetland is emerging as a promising low-cost approach to improve treatment of point and diffuse sources in broad rural areas in developing countries. In this paper, the performance of two typical types of constructed wetlands, FWS (Free Water Surface) and SF (Subsurface Flow) constructed wetlands was investigated on pollutants removal, furthermore, the risk of resulting water bloom for the effluent is also discussed using the parameter of algae growth potential (AGP). The results indicated that the pollutant removal rate measured in the wetland indicated obvious seasonal change. But subsurface constructed wetland indicated more preferable pollutants removal performance and higher stability for wastewater treatment than FWS constructed wetland. The results also indicated that SF constructed wetland could alleviate the effluent's potential of resulting in eutrophication.

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