1、 毕毕 业业 实实 习习 论论 文文 题题 目:目: 浅谈城市污水处理工艺浅谈城市污水处理工艺 学学 院:院: 环境与环境与资源分院资源分院 专专 业:业: 环境监测与治理环境监测与治理 学学 号号: 20131121572013112157 2015 年年 12 月月 15 日日 摘摘 要要 在维系人的生存,保障经济建设和维护社会发展的所有自然要素中,水的重要性 毋庸赘述,然而随着工业化、城市化进程的加快,全世界都面临着水资源短缺,污染 严峻的挑战。而在中国尤为严重。我国作为一个新兴的发展中国家,最近几十年,随 着经济的发展,环境问题也日益严峻。许多城市水污染事故频繁发生,也使得我国本 来十
2、分严峻的水资源供给形势更加严峻。目前中小城市的污水排放量约占全国污水排 放总量的一半以上,未来城镇建设的快速发展会使得污水排放量大幅增加,势必会加 剧水环境的恶化。且城市污水是一种混合污水,须经处理达到相关排放标准才能排放 水体,避免造成水体污染,故污水处理厂处理水再利用时,应按照使用目的执行相应 的标准,确定相应的废水处理深度工艺。污水的资源化、污水的再生利用,既提高了 水的利用率又有效地保护了环境,有利于实现城市水系统健康、良性循环。是解决水 资源短缺,水污染的有效途径。本文较详细的介绍了几种生化处理工艺,比较了它们 各自的优缺点,并根据实际情况选择了合适的处理工艺。最终选择 CASS 工
3、艺来处理 城市生活污水。 关键词:关键词:城市污水 处理工艺 CASS 工艺 Abstract In maintaining peoples survival, protection of economic construction and maintenance of all natural elements of social development, the importance of water needless to say, however, with the speeding up of industrialization and urbanization, the whole
4、world is facing water shortage, pollution serious challenges.And in China particularly serious.In China as an emerging developing countries, in recent decades, with the development of economy, environmental problems are increasingly serious.Many cities water pollution accidents occur frequently, als
5、o makes our country have serious water supply situation is more serious.The sewage of small and medium-sized cities which accounts for more than half of total sewage discharge, the rapid development of the future urban construction will make wastewater emissions increased dramatically, will aggravat
6、e the deterioration of water environment.And urban wastewater is a kind of mixed sewage, related emission standards must be approved by processing achieve to discharge water, avoid to cause water pollution, so the water recycling, sewage treatment plant should be in accordance with the purpose to perform the corresponding standards, determine the corresponding depth of the wastewater treatment process.Utilization of sewage, wastewater recycling, can not only improve