文档介绍：第四章城市水资源的可持续利用第一节城市水资源良性循环理论与策略第二节城市污水的可持续处理工艺第三节雨水利用技术第一节城市水资源良性循环理论与策略一、城市水资源的健康循环水的健康循环,是指在水的社会循环中,尊重水的自然运动规律和品格,合理科学地使用水资源, 同时将使用过的废水经过再生净化,使得上游地区的用水循环不影响下游水域的水体功能,水的社会循环不损害水自然循环的客观规律,从而维系或恢复城市乃至流域的良好水环境,实现水资源的可持续利用。 Water Treatment work work Centralised WWTP Effluent discharge 水的社会循环? US: $ 100 billion per year EU: $ 30 billion per year Endocrine disruptors Pathogens Micro-contaminants Environmental sustainability? End of pipe solution Rational? 二、基本实施策略 3-step approach Nhapi and Gijzen (2005) STEP 1 Pollution prevention and minimisation ? reduce water use ? reuse grey water ? ban undesirable compounds (toxicants) ? apply rainwater harvesting STEP 2 Treatment in the direction of reuse ? convert waste to useful products (biogas, protein) ? optimize effluent reuse STEP 3 Disposal with stimulation of self- purification ? buffer strips ? river bank filtration Water resource SWITCH – Sustainable Water management Improves Tomorrow ’ s Cities ’ Health