Physicochemical parameters of surface water sources in the study of local government areas (LGAs) were assessed using standard procedures. The mean physicochemical parameters for pH (5.49), NO2 (0.23 mg/L), SO4 (0.77 ...Physicochemical parameters of surface water sources in the study of local government areas (LGAs) were assessed using standard procedures. The mean physicochemical parameters for pH (5.49), NO2 (0.23 mg/L), SO4 (0.77 mg/L), Na (28.72 mg/L), Ca (28.94 mg/L), Mg (17.50 mg/L), Cl (11.65 mg/L), TSS (6.27 mg/L), TDS (104.23 mg/L), BOD (2.83 mg/L) and F (0.87 mg/L) were below WHO standards irrespective of their defecation status. The values for electrical conductivity (EC) (2770.50 µs/cm, turbidity (481.24 NTU), dissolved oxygen (DO) (5.32 mg/L), chemical oxygen demand (COD) (445.50 mg/L), K (125.06 mg/L), PO4 (0.78 mg/L) and Fe (0.57 mg/L) were above the WHO limits for safe water. Higher EC and COD values obtained in the study is evidence of pollution of the water sources by organic matter.展开更多
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...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.展开更多
Industries have contributed for human development by improving human life styles, increasing human life expectancy rate, providing more and more jobs. Still industrialization has many negative impacts on the environme...Industries have contributed for human development by improving human life styles, increasing human life expectancy rate, providing more and more jobs. Still industrialization has many negative impacts on the environment and especially on human health. This investigation was carried out to probe the impacts of Quaid-e-Azam Industrial Estate on Township area, Lahore. During this investigation wastewater monitoring and ambient air monitoring had been done. Samples from main industrial drain were collected for wastewater analysis and seventeen parameters including pH, temperature, color, odor, turbidity, conductivity, chemical oxygen demand (COD), biological oxygen demand (BOD), chlorides, oil/grease, total suspended solids (TSS), total dissolved solids (TDS), ammonia-nitrogen (NH3 - N2), iron, sulfate, nickel and chromium were investigated. Among them pH, total suspended solids, biological oxygen demand, chemical oxygen demand, ammonia-nitrogen were found exceeding the NEQS limits. The ambient air samples were also collected and five parameters of ambient air including particulate matter (PM10), nitrogen dioxide, sulfur dioxide, carbon monoxide and noise were monitored. Among them only particulate matter was exceeding the WHO guidelines. Although there were few parameters like pH, TSS, BOD, COD and NH3 - N2 of water and PM10 of air, which do not lie within the national environmental quality standards (NEQS) limits but proper monitoring is needed to be done so that parameters may not cross their permissible limits in future. This problem must be taken into consideration by both the management of Quaid-e-Azam Industrial Estate and Governmental agencies because it is the responsibility of state also to make the environment clean.展开更多
There is a need to formulate water environment standards（WESs） from the current water quality criteria（WQC） in China.To this end,we briefly summarize typical mechanisms applied in several countries with longer his...There is a need to formulate water environment standards（WESs） from the current water quality criteria（WQC） in China.To this end,we briefly summarize typical mechanisms applied in several countries with longer histories of developing WESs,and three limitations to formulating WESs in China were identified.After analyzing the feasibility factors including economic development,scientific support capability and environmental policies,we realized that China is still not ready for a complete change from its current nation-wide unified WES system to a local-standard-based system.Thus,we proposed a framework for transformation from WQC to WESs in China.The framework consists of three parts,including responsibilities,processes and policies.The responsibilities include research authorization,development of guidelines,and collection of information,at both national and local levels;the processes include four steps and an impact factor system to establish water quality standards;and the policies include seven specific proposals.展开更多
文摘Physicochemical parameters of surface water sources in the study of local government areas (LGAs) were assessed using standard procedures. The mean physicochemical parameters for pH (5.49), NO2 (0.23 mg/L), SO4 (0.77 mg/L), Na (28.72 mg/L), Ca (28.94 mg/L), Mg (17.50 mg/L), Cl (11.65 mg/L), TSS (6.27 mg/L), TDS (104.23 mg/L), BOD (2.83 mg/L) and F (0.87 mg/L) were below WHO standards irrespective of their defecation status. The values for electrical conductivity (EC) (2770.50 µs/cm, turbidity (481.24 NTU), dissolved oxygen (DO) (5.32 mg/L), chemical oxygen demand (COD) (445.50 mg/L), K (125.06 mg/L), PO4 (0.78 mg/L) and Fe (0.57 mg/L) were above the WHO limits for safe water. Higher EC and COD values obtained in the study is evidence of pollution of the water sources by organic matter.
文摘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.
文摘Industries have contributed for human development by improving human life styles, increasing human life expectancy rate, providing more and more jobs. Still industrialization has many negative impacts on the environment and especially on human health. This investigation was carried out to probe the impacts of Quaid-e-Azam Industrial Estate on Township area, Lahore. During this investigation wastewater monitoring and ambient air monitoring had been done. Samples from main industrial drain were collected for wastewater analysis and seventeen parameters including pH, temperature, color, odor, turbidity, conductivity, chemical oxygen demand (COD), biological oxygen demand (BOD), chlorides, oil/grease, total suspended solids (TSS), total dissolved solids (TDS), ammonia-nitrogen (NH3 - N2), iron, sulfate, nickel and chromium were investigated. Among them pH, total suspended solids, biological oxygen demand, chemical oxygen demand, ammonia-nitrogen were found exceeding the NEQS limits. The ambient air samples were also collected and five parameters of ambient air including particulate matter (PM10), nitrogen dioxide, sulfur dioxide, carbon monoxide and noise were monitored. Among them only particulate matter was exceeding the WHO guidelines. Although there were few parameters like pH, TSS, BOD, COD and NH3 - N2 of water and PM10 of air, which do not lie within the national environmental quality standards (NEQS) limits but proper monitoring is needed to be done so that parameters may not cross their permissible limits in future. This problem must be taken into consideration by both the management of Quaid-e-Azam Industrial Estate and Governmental agencies because it is the responsibility of state also to make the environment clean.
基金supported by the National Water Pollution Control and Treatment Science and Technology Major Project(No.2015ZX07203-005)the National Natural Science Foundation of China(No.41571478)
文摘There is a need to formulate water environment standards（WESs） from the current water quality criteria（WQC） in China.To this end,we briefly summarize typical mechanisms applied in several countries with longer histories of developing WESs,and three limitations to formulating WESs in China were identified.After analyzing the feasibility factors including economic development,scientific support capability and environmental policies,we realized that China is still not ready for a complete change from its current nation-wide unified WES system to a local-standard-based system.Thus,we proposed a framework for transformation from WQC to WESs in China.The framework consists of three parts,including responsibilities,processes and policies.The responsibilities include research authorization,development of guidelines,and collection of information,at both national and local levels;the processes include four steps and an impact factor system to establish water quality standards;and the policies include seven specific proposals.
