概念污水处理厂A2O工艺设计.doc

XXX 大学本科毕业设计 I 某城市 20万t/ 日污水处理厂 A 2 /O 工艺设计摘要水是人类赖以生存的宝贵资源,没有水生命就不存在。随着城市化速度的加快和生活水平的提高,城市生活污水的排放量也逐年增加。城市生活污水污染物含量主要是有机物,排入水体后易造成水体的富营养化,使藻类大量生长繁殖,造成赤潮和水华。藻类生物原生质的组成可知水中含少量的氮、磷就能促使藻类大量生长,而当藻类代谢大量死亡时,就使水域水体***发臭水质恶化。 A 2 /O 处理工艺是 Anaerobic - Anoxic - Oxic 的英文缩写, 它是厌氧-缺氧-好氧生物脱氮除磷工艺的简称。该工艺是目前较为流行的具有一定代表性的污水生物脱氮除磷技术, 其反应池由厌氧池、缺氧池和好氧池组成。经初沉池沉淀后的废水和回流污泥自厌氧池流入,循环硝化液由好氧池用泵送人缺氧池。在厌氧池进行磷的释放,在缺氧池进行反硝化脱氮,在好氧池进行硝化和磷的摄取, 废水再经二沉池沉淀后排放。由于该工艺的流程较为简单,墓建费用和运行费用均较低,又具有同步脱氮除磷的功效,因此成为目前研究和应用较多的一种工艺。本设计的主要目的是探讨该工艺的各种影响因素以确定使脱氮除磷效果达到最佳的状况; 同时也对如何控制该工艺中的污泥膨胀问题进行了设计上的改进。关键词: A 2 /O 工艺, 生活污水, 污泥处理, 中水回用 XXX 大学本科毕业设计 II 200,000 Tons / Day Sewage Treatment Plant A 2 /O Technology Design Abstract Water is for the survival of valuable human resources, life would not exist without water. With the accelerated pace of urbanization and the improvement of living standards, urban sewage discharge volume has increased year by year. Urban sewage is the main content anic pollutants, discharged into the water after easily cause the eutrophication of water bodies so that the large growth of algae, caused by red tide, and water. metabolism and when large number of dead algae, which makes the waters of corruption Faxiu water quality deterioration. Beijing is China's political, cultural and international exchange center, prehensive industrial city. As densely populated, with few rivers, Beijing isa severe water shortage problem, so it is necessary to take realistic approach to sewage treatment to use to meet the water demand in Beijing, Beijing is the first to solve the problem. A 2 /O process is Anaerobic-Anoxic-Oxic the stands, it is anaerobic - hypoxia - aerobic biological nitrogen and phosphorus removal of the short title. The process is now more popular with a certain representation of the sewage biological nutrient removal technology, its tank by the anaerobic pond, pool and aerobic hypoxia position. precipitated by the beginning of the wastewater and sludge back into the pool from anaerobic, aerobic cyc