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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 Various Light-Emitting Diode(LED)Wavelengths on the Growth of Scenedesmus Obliquus Fachb-12 and Accumulation of Astaxanthin

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Phyton-International Journal of Experimental Botany 2019年第3期88卷 335-348页

作者： Huabing Xu Xiaojuan Liu Zhiping Mei Jinchun Lin Stephan Aaron Hong Du Guangdong Provincial Key Laboratory of Marine Biotechnology and STU-UNIVPM Joint Algal Research Center College of SciencesShantou UniversityShantou515063China ONCE Inc.1525523rd Ave N Plymouth MN 55447USA

Given the central role of light in the algal photosynthesis,respiration,cell division,growth and the accumulation of value products,the effects of light-emitting diodes(LEDs)light wavelengths(blue,white,red and green)were studied in Scenedesmus ***,residual nutrient amount,soluble protein,astaxanthin and reactive oxygen species,superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)activity were analyzed to determine the effects of different monochromatic light wavelengths via biochemical *** results showed that blue light wavelength is the optimal light wavelength for phosphorus removal efficiency and the accumulation of biomass and astaxanthin in ***,high reactive oxygen species content under the blue light might induce the accumulation of *** high activity of SOD,CAT and POD might participate in clearing the reactive oxygen species to facilitate the growth of ***,we found mixed blue/green lights treatment is the most appropriate mixture for the nitrogen *** the blue light treatment,high light intensity and 18L:6D light cycle is the best condition for biomass and astaxanthin *** nitrogen/phosphorus removal efficiency was observed under a 24L:0D light *** results might provide a foundational data for the optimizing the productivity of high-value metabolites and treatment of wastewater.

关键词： Light-emitting diodes wavelength cell density nutrient removal efficiency astaxanthin

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