本课程是给排水专业的重要专业基础课，介绍水处理中微生物（原核微生物、真核微生物、非细胞结构病毒等）形态结构、生理特征，水生动植物生态类型。阐述微生物在含碳、含氮有机物降解途径，无机元素（磷、铁、硫等）生物转化作用。生物对环境危害，病源菌在水中传播及其控制。生物在水环境监测作用，水质分析中生物检测等。阐明微生物在污水生物处理中作用机理，典型废水生物处理工艺（活性污泥法、生物膜法、厌氧处理）中微生物特性，污水生态处理中的生物功能。
     “Biology for Water and Wastewater Treatment” is an important professional basic course for Water Science and Engineering. The shapes, structure, and physiological feature of microbes (Prokaryote , eucaryotes and non-cellular virus) are described and aquatic plants and animals are stated by ecological classification. Microbial function in decomposition of organic compounds containing carbon, and nitrogen are illustrated. Microbial function in biotransformation of inorganic elements (phosphorus, iron, and sulfur, et al.),biological harm to water environment, infection of pathogenic bacteria in waters and its controlling are shown. Biology in environmental monitoring and drinking water analysis are given. Microbial role in wastewater treatment and its characters in typical treatment process (activated sludge, biofilm process and anaerobic treatment), biological function of ecological wastewater treatment also are described.