文档介绍：该【UCT工艺 】是由【儒林】上传分享，文档一共【39】页，该文档可以免费在线阅读，需要了解更多关于【UCT工艺 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。UCT工艺-35-毕业设计(论文)题目UCT生活污水脱磷除氮效果研究系(部)制药与环境工程系专业环境监测与治理技术指导教师梁贤君(校内)-35--35-目录前言···············································51、UCT工艺·······································、UCT工艺简介·······································、UCT工艺影响条件-1-···································、负荷的影响······································、溶解氧的控制····································、污水的进水总磷的浓度偏高·······················、进水的pH值不稳定······························、泥龄过长·······································、浓缩和脱水的上清液二次释放······················、厌氧段停留时间·································、水温的影响······································、UCT一般设计参数··································、UCT反应池设计····································9A2/O工艺····································、传统A2/O工艺····································、改良版A2/O工艺··································、倒置A2/O工艺的原理与特点研究···················、材料与方法-2-···································、实验结果与讨论·······························、短时厌氧环境及其对聚磷菌的影响·····、厌氧、缺氧环境倒置对聚磷菌的影响····、倒置A2/O工艺的特点············16水样中化学需氧量(COD)的测定················、基本原理·········································、主要试剂·········································、实验方法·········································、COD除去率·······································19TN(总氮)的监测·····························、定义·············································、监测目的·········································、TN的测定原理·····································、仪器及试剂·······································、仪器········································22-3-、试剂········································、TN(总氮)测定实验步骤···························、校准曲线的绘制······························、样品测定步骤·······································、空白试验······································、实验结果处理和计算·····························、注意事项···········································、除去率·············································245、总磷··········································、定义·············································、仪器及试剂·········································、仪器···········································、试剂···········································、实验步骤···········································(过硫酸钾消解)···························27-4-、样品测定·······································、除去率·············································、注意事项···········································29结论:··············································30参考文献···········································31致谢···············································32-5-前言长期以来,城市生活污水的处理均以去除有机物和悬浮固体为目标,并不考虑对氮、磷等无机营养物的去除。随着污水排放总量的不断增加,以及化肥、合成洗涤剂等广泛应用,废水中氮、磷营养物质对环境所造成的影响也逐渐引起了人们的注意。另外随着水资源的日益紧张,城市生活污水越来越多要求回用,如二级处理采用普通活性污泥法,主要是降低污水中以BOD、COD综合指标表示的含碳有机物和悬浮固体的浓度,污水中氮、磷的去除仅限于微生物细胞由于生理上的需要而从污水中摄取的数量,去除率很低,氮的去除率为2O%~4O%,磷的去除率仅为lO%~3O%。一般工业循环水要求NHN≤lOmt/g,这对氨氮的去除率要求很高,而常规的混凝、沉淀、过滤的后续处理工艺对氨氮的去除率很低,只有lO~2O%,根本不能满足对氨氮的去除要求。化学方法虽然可以有效地去除废水中的磷,但纯化学方法运行操作复杂,费用较高。因此,生物除磷脱氮技术由于其优越性取得了飞速的发展,在实践中得以广泛地应用。近2O年来,污水除磷脱氮技术一直是污水处理领域的热点也是难点。l983年国际水污染控制和研究协会在哥本哈根举行了第一次氮磷去除国际会议,这是污水除磷脱氮技术研究和工程应用取得重大进展的重要标志。所有生物除磷脱氮工艺都包含厌氧、缺氧、好氧三个不同过程的交替循环,主要有三个系列:(1)A/O;(2)氧化沟;(3)序批式反应器(sBR)。UCT工艺与A2/O工艺不同之处在于沉淀池污泥回流到缺氧池而不是回流到厌氧池,这样可以防止由于***盐氮进入厌氧池,破坏厌氧池的厌氧状态而影响系统的除磷率。增加了从缺氧池到厌氧池的混合液回流,由缺氧池向厌氧池回流的混合液中含有较多的溶解性BOD,而***盐很少,为厌氧段内所进行的有机物水解反应提供了最优的条件。在实际运行过程中,当进水中总凯氏氮TKN与COD的比值高时,需要降低混合液的回流比以防止NO3-进入厌氧池。但是如果回流比太小,会增加缺氧反应池的实际停留时间,而实验观测证明,如果缺氧反应池的实际停留时间超过1h,在某些单元中污泥的沉降性能会恶化。-7-