（毕业设计论文）《水力旋转生物膜反应器处理生活污水》.doc

PAGE 武汉科技学院 毕业设计（论文） 题目：水力旋转生物膜反应器处理生活污水 院 系：环境与化学工程系 专 业：环境工程 学 生： 学 号： 指导老师： 摘 要 本论文主要研究一种新型生物膜反应器对生活污水处理的工艺条件。研究内容包括填料上生物膜从挂膜到膜成熟生物相的观察；废水水质调查；不同工艺条件下的水质监测；以及对处理效果的分析。对生物膜的调查发现，一级水力旋转生物膜反应器上生物膜量为11.602 g/m2，二级反应器上生物膜量为9.068 g/m2，BOD污泥负荷分别为 0.167 kgBOD/kgMLSS和0.076kgBOD/kgMLSS。通过实验在进水量为6t/hr、8t/hr、9t/hr时及回流比分别为1：0，1：0.5和1：1条件下 的污水处理效果发现，进水量为6t/hr、8t/hr、9t/hr时COD去除率分别为76.93%、74.72%、71.64%；回流比较大时充氧效果较好，相应的COD去除率也较高，当进水量为8t/hr且回流比为1:1时的出水COD为42.54mg/L，此时出水COD值达到国家一级排放标准，当水量升到9t/hr出水COD就增加到64.20 mg/L。因此，综合考虑8t/hr为最佳进水量，并且在此时的总氮去除率为36.6%，总磷的去除率为23.45%。研究表明，该生物膜反应器生物膜上生物种类丰富，污水处理效率高，出水水质好，可使用于不同规模的城市及工业污水的生化处理。 关键词：废水好氧生物处理；生物膜技术；生物膜；水力旋转生物膜反应器；水力停留时间 Abstract The paper mainly studied a novel bio-film reactor and its wastewater treatment process condition. The study included observation on biophase of biofilm from start-up period to ripe period, wastewater quality mornintoring, condition of treatment and analysis of the treatment. The investigation on bio-film indicate that the amount of biofilm in the first waterpower rotating reactor is 11.602 g/m2 ,the second is 9.068 g/m2 .And the COD load is 0.167 kgCOD/kgMLSS and 0.076 kgCOD/kgMLSS respectively. We studied influence of different influent flux (6t/hr, 8t/hr, 9t/hr) and recirculation ratio (1:0, 1:0.5, 1:1) on treatment. When the water input is 6t/hr, 8t/hr, 9t/hr, the COD removal rate is 76.93%,74.72%,71.64% respectively; COD removal rate increased with recirculation ratio increasing, because oxygen transfer ability increase with higher recirculation ratio. while the water input is 8 t/hr and recirculation ratio is 1:1, the effluent COD is 42.54 mg/L. This value could measure up to the national first-order discharge standard .The COD value increased to 64.20 mg/L when the influent is 9t/hr. Therefore, considering from the economics, the optimum influent flux is 8 t/hr, at the same time removal rate of the total nitrogen and phosphate is respectively 36.6% and 23.45%.The experiment showed th