城市污水处理技术.pptxVIP

城市污水处理技术第1页/共78页 21. Contaminants in Water1.1 Target of Water Quality ControlWastewater Discharge RegulationKey point: Protection of human health 第2页/共78页 31.2 Capacity of Water EnvironmentA simple calculationCi : Concentration of contaminant iMi : Mass of contaminant i in waterV : Water volumeMi0 : Mass of contaminant i receivedMir : Mass of contaminant i assimilated (removed) by the water body itself (self purification)第3页/共78页 41.2 Capacity of Water EnvironmentWater quality criteriaThis is equivalent toMir is a measure of the environmental capacityCis : Standard for contaminant iMis : Maximum permissible mass of contaminant i in water第4页/共78页 51.3 Water Environmental StandardAmerican standard: Clean Water Act (CWA)Ambient Water Quality Criteria for the Protection of Human HealthAquatic Life CriteriaNutrient Criteria第5页/共78页 61.3 Water Environmental StandardAmerican standard: Clean Water Act (CWA)The NRWQC 2002 includesCriteria for priority toxic pollutants: 120 items (15 for inorganic, 105 for organic pollutants)Criteria for non priority pollutants: 45 itemsCriteria for organoleptic (taste and odor) effects: 23 items Downloadable at /waterscience/criteria/ wqcriteria.html第6页/共78页 71.3 Water Environmental StandardChinese standard: Environmental Quality Standards for Surface Water (GB 3838-2002)Fundamental parameters (地表水环境质量标准基本项目标准限值): 24 itemsSupplemental parameters for source water for community water supply (集中式生活饮用水地表水源地补充项目标准限值): 5 itemsSpecific parameters for source water for community water supply (集中式生活饮用水地表水源地特定项目标准限值): 80 items第7页/共78页 8表1 地表水环境质量标准基本项目标准限值 (单位: mg/L)第8页/共78页 9表1 地表水环境质量标准基本项目标准限值 (单位: mg/L)第9页/共78页 10表1 地表水环境质量标准基本项目标准限值 (单位: mg/L)第10页/共78页 11表2? 集中式生活饮用水地表水源地补充项目标准限值(单位：mg/L)第11页/共78页 12表3? 集中式生活饮用水地表水源地特定项目标准限值(单位：mg/L)第12页/共78页 13表3? 集中式生活饮用水地表水源地特定项目标准限值(单位：mg/L)第13页/共78页 14表3? 集中式生活饮用水地表水源地特定项目标准限值(单位：mg/L)第14页/共78页 151.4 Pollutants of Public ConcernIndicative parametersSuspended solids: SSDis