Chapter 5 Drinking Water and Health
Chapter 5 Drinking Water and Health
Section one Hygienic Significance of Drinking Water
Section one Hygienic Significance of Drinking Water
Water is essential to life Our health depends on the quality and safety of water Water pollution and poor water resources are the big problem in China. There are 700 million people in China, whose drinking water is not safe Fresh water availability per person in China, on average, are less than one third of the world average. 56%o of 27 rivers, which are main sources of drinking water in China, are polluted with different degree
• Water is essential to life. • Our health depends on the quality and safety of water. • Water pollution and poor water resources are the big problem in China. • There are 700 million people in China, whose drinking water is not safe. • Fresh water availability per person in China, on average, are less than one third of the world average. • 56% of 27 rivers, which are main sources of drinking water in China, are polluted with different degree
我国水资源污染的主要问题 1.迅速的工业化一向地面水大量排放化学污染物 有毒有害物质增加,若处理不当或不加处理,污 染水源后可造成人群的急、慢性中毒,甚至引起致 突变、致癌和致畸作用 2.城市化发展一城市生活污水处理设施贫乏 水源受到生活污水的污染,加之饮水消毒设施不 完善,常可使饮水水质不良,从而导致肠道疾病患病 率增加,甚至引起介水传染病的流行。 3.现代农业发展一对水资源的影响 大量使用化肥和农药,用未处理的污水进行灌溉 家禽和家畜饲养业迅速发展,带来了大量的废物和 染物,造成水体的富营养化
我国水资源污染的主要问题 1 . 迅速的工业化— 向地面水大量排放化学污染物。 有毒有害物质增加，若处理不当或不加处理，污 染水源后，可造成人群的急、慢性中毒，甚至引起致 突变、致癌和致畸作用。 2. 城市化发展— 城市生活污水处理设施贫乏 水源受到生活污水的污染，加之饮水消毒设施不 完善，常可使饮水水质不良，从而导致肠道疾病患病 率增加，甚至引起介水传染病的流行。 3. 现代农业发展— 对水资源的影响 大量使用化肥和农药，用未处理的污水进行灌溉， 家禽和家畜饲养业迅速发展，带来了大量的废物和污 染物，造成水体的富营养化
Section two Drinking Water and Health
Section two Drinking Water and Health