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Modeling the effects of constructed wetland on nonpoint source pollution control and reservoir water quality improvement

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Journal of Environmental Sciences 2010年第6期22卷 834-839页

作者： Jonghwa Ham Chun G.Yoon Hyung-Joong Kim Hyung-Chul Kim Rural Research Institute of KRC Environmental Science Department Konkuk University

This article describes the integrated modeling approach for planning the size and the operation of constructed wetlands for maximizing retention of nonpoint source pollutant loads and reservoir water-quality improvement at a catchment scale. The experimental field-scale wetland systems （four sets, 0.88 ha each） have been in operation since 2002, where water depth was maintained at 30-50 cm and hydraulic loading rate was at 6.3-18.8 cm/day. The wetland system was found to be adequate for treating polluted stream water with stable removal efficiency even during the winter. The integrated modeling system （modified-BASINS） was applied to the Seokmoon estuarine reservoir watershed and calibrated with monitoring data from constructed wetland, stream, and reservoir. The calibrated integrated modeling system estimated that constructing wetlands on 0.5% （about 114 ha） of the watershed area at the mouth of reservoir could reduce 11.61% and 13.49% of total external nitrogen and phosphorus loads, respectively. It also might improve the nitrogen and phosphorus concentration of the reservoir by 9.69% and 16.48%, respectively. The study suggested that about 0.1%-1.0% of the watershed area should be allocated for constructed wetland to meet specified water-quality standards for the estuarine reservoir at the polder area where land use planning is relatively less complicated.

关键词： constructed wetland estuarine reservoir integrated modeling system nonpoint source pollution control polder area water quality improvement

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Performance of a Horizontal Flow Constructed Reed Bed Filter for Municipal Wastewater Treatment: The Case Study of the Prototype Installed at Gaston Berger University, Saint-Louis, Senegal

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Natural Resources 2024年第1期15卷 1-16页

作者： Abdou Khafor Ndiaye Falilou Coundoul Abdoulaye Deme Antonina Torrens Armengol Abdoulaye Senghor UFR of Applied Sciences and Technology Gaston Berger University of Senegal Saint-Louis Senegal Polytechnic Institute of Saint-Louis (IPSL) Gaston Berger University of Saint-Louis Saint-Louis Senegal Department of Biology Healthcare and Environment Faculty of Pharmacy and Food Sciences University of Barcelona Barcelona Spain Sanitation Department Ministry in Charge of Sanitation Dakar Senegal

In Saint-Louis, Senegal, a constructed wetland with horizontal flow reed beds (FHa and FHb) has demonstrated significant efficacy in treating municipal wastewater. Analyzing various treatment stages, the system showed only a slight temperature variation, from an influent average of 26.3°C to an effluent of 24.7°C. Electrical conductivity decreased from 1331 mS/cm to 974.5 mS/cm post-primary treatment, with suspended solids (SS) dramatically reduced from 718.9 mg/L to 5.7 mg/L in the final effluent. Biochemical oxygen demand (BOD5) and chemical oxygen demand (COD) saw a notable decrease, from initial levels of 655.6 mg/L and 1240 mg/L to 2.3 mg/L and 71.3 mg/L, respectively. Nitrogenous compounds (N-TN) and phosphates () also decreased significantly, indicating the system’s nutrient removal capacity. Microbiological analysis revealed a reduction in fecal coliforms from 7.5 Ulog/100ml to 1.8 Ulog/100ml and a complete elimination of helminth eggs. The presence of Phragmites and Typha was instrumental in enhancing these reductions. The system’s compliance with the Senegalese standards for disposal into natural environments, WHO recommendations for unrestricted water reuse in irrigation, and the European legislation for water reuse was established. The effluent quality met the stringent criteria for various classes of agricultural reuse, illustrating the system’s potential for sustainable water management. This wetland model presents a robust solution for water-stressed regions, ensuring environmental protection while supporting agricultural needs. The study calls for ongoing research to further refine the system for optimal, reliable wastewater treatment and water resource sustainability.

关键词： Constructed Wetlands Horizontal Flow Reed Beds Wastewater Treatment Phragmites and Typha Plants Physicochemical Pollutant Removal Microbiological Indicators Fecal Coliforms and Helminth Eggs water quality improvement Senegal water Reuse Standards Sustainable water Management Agricultural Irrigation Reuse Nutrient Removal Efficiency Environmental Engineering Ecological Sanitation Systems

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EFFECTS OF water quality improvement BY INSTALLATION OF AERATING CIRCULATION FACILITIES IN DAM RESERVOIRS

EFFECTS OF WATER QUALITY IMPROVEMENT BY INSTALLATION OF AERA...

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International Symposium on Modern Technology of Dams--The 4th EADC Symposium

作者： Kaoru TAKEYA Shinsuke UNISUGA Kosuke YONEMARU Ofice of the Environment Japan Wetter AgencySaitama-shintoshinChuo-ku.Saitama City. Ofice of the Environment Japan Wetter AgencySaitama-shintoshinChuo-ku.Saitama City. Ofice of the Environment Japan Wetter AgencySaitama-shintoshinChuo-ku.Saitama City.

＜正＞Phytoplankton increases extraordinarily almost every year,caused by eutrophication in dam reservoirs which are managed by Japan water Agency.The problems include deterioration of landscape, deterioration of drinking water quality due to foul smell and taste,interference of water purification plants and disorder of agricultural water service system. Following the management philosophy,“We provide stable supply of safe,quality water at a reasonable price,”Japan water Agency carried out measures to counteract these problems in recent years. We installed aerating circulation facilities and operated them appropriately in dam reservoirs to restrain the proliferation of the phytoplankton.The effectiveness was observed to a certain degree. This report outlines the mechanism of restraining the blue-green algae growth by installing and operating aerating circulation facilities in the dam reservoirs,and describes the interim research findings of water quality improvement by showing data of the vertical distribution of water temperature in the reservoir and downward trend of the cell count in species of algae.

关键词： dam reservoir water quality improvement aerating circulation blue-green algae

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Effect of phosphorus fluctuation caused by river water dilution in eutrophic lake on competition between blue-green alga Microcystis aeruginosa and diatom Cyclotella sp.

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Journal of Environmental Sciences 2010年第11期22卷 1666-1673页

作者： Yoshimasa Amano Yusuke Sakai Takumi Sekiya Kimitaka Takeya Kazuo Taki Motoi Machida Graduate School of Engineering Chiba University Safety and Health Organization Chiba University Faculty of Engineering Chiba Institute of Technology

Tega-numa （Lake Tega） is one of the eutrophic lakes in Japan. For the improvement of water quality in Lake Tega, the North- chiba water Conveyance Channel was constructed in 2000, which transfer water from Tone River into the lake. After 2000, the dominant species of diatoms, mainly Cyclotella sp., have been replacing blue-green algae, mainly Microcystis aeruginosa in Lake Tega. This transition of dominant species would be due to the dilution, but the detail mechanism has not been understood yet. This study examined the relationship between phosphorus fluctuation caused by river water dilution to Lake Tega and dominance of algal species, M. aeruginosa or Cyclotella sp. based on the single-species and the mixed-species culture experiments. The single-species culture experiment showed that the half-saturation constant and uptake rate of phosphorus were one order lower and seven times higher for M. aeruginosa than those for Cyclotella sp. These findings implied that M. aeruginosa would possess a potential for the growth and survival over Cyclotella sp. in the phosphorus limited condition. The superiority of M. aeruginosa was reflected in the outcome of the mixed-species culture experiment, i.e., dominance of M. aeruginosa, even phosphorus concentration was lowered to 0.01 mg-P/L. Therefore, it could be concluded that the decrease in phosphorus concentration due to the river water dilution to Lake Tega would be interpreted as a minor factor for the transition of dominant species from M. aeruginosa to Cyclotella sp.

关键词： eutrophic lake water quality improvement water blooms Microcystis aeruginosa Cyclotella sp.

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