城市污水处理技术(英文)技术分析.ppt

An Introduction to Urban Water and Wastewater Treatment Technologies Contents 1. Contaminants in Water 2. Contaminant Sources and Treatability 3. Best Available Technologies 4. Trend of Development 1. Contaminants in Water 1.1 Target of Water Quality Control Wastewater Discharge Regulation Key point: Protection of human health 1.2 Capacity of Water Environment A simple calculation Ci : Concentration of contaminant i Mi : Mass of contaminant i in water V : Water volume Mi0 : Mass of contaminant i received Mir : Mass of contaminant i assimilated (removed) by the water body itself (self purification) 1.2 Capacity of Water Environment Water quality criteria This is equivalent to Mir is a measure of the environmental capacity Cis : Standard for contaminant i Mis : Maximum permissible mass of contaminant i in water 1.3 Water Environmental Standard American standard: Clean Water Act (CWA) Ambient Water Quality Criteria for the Protection of Human Health Aquatic Life Criteria Nutrient Criteria 1.3 Water Environmental Standard American standard: Clean Water Act (CWA) The NRWQC 2002 includes Criteria for priority toxic pollutants: 120 items (15 for inorganic, 105 for organic pollutants) Criteria for non priority pollutants: 45 items Criteria for organoleptic (taste and odor) effects: 23 items Downloadable at /waterscience/criteria/ wqcriteria.html 1.3 Water Environmental Standard Chinese 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 items Supplemental 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 items Specific 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 表1 地表水环境质量标准基本项目标准限值 (单位: mg/L) 表1 地表水环境质量标准基本项目标准限值 (单位: mg/L) 表1 地表水环境质量标准基本项目标准限值 (单位: mg/L) 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) 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) 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) 表3? 集中式生活饮用水地表水源地