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题名: 氧化沟污水处理系统的数值模拟与工艺优化
作者: 李峥
学位类别: 博士
答辩日期: 2012
授予单位: 中国科学院研究生院
授予地点: 北京
导师: 杨敏
关键词: 贝叶斯推论 ; Bayesian inference ; 数值模拟 ; numerical simulation ; 综合指数 ; unified index ; 工艺优化 ; process optimization ; 氧化沟 ; oxidation ditch ; 污水处理 ; wastewater treatment
其他题名: Numerical simulation and process optimization of oxidation ditch system for wastewater treatment
中文摘要:       本研究基于贝叶斯推论方法构建了氧化沟工艺的数值模拟平台,用于氧化沟污水处理系统的模拟与工艺优化研究。基于所构建的氧化沟工艺模拟平台,采用国际水协活性污泥模型ASM2d分别对浅沟型和深沟型氧化沟工艺在当前动态运行条件下的脱氮除磷性能进行了数值模拟,并使用贝叶斯统计推论方法对重要模型参数进行了估计与校正。模拟结果表明:经贝叶斯推论方法校正后的氧化沟模型可靠,能够用于进一步的工艺优化研究。 根据动态模拟的结果,本研究对浅沟型氧化沟工艺系统进行了动力学分析,针对除磷系统和脱氮过程进行了平衡分析,结果表明:氧化沟内反硝化除磷对磷的去除有重大贡献,在系统中占主导地位。同时,曝气转刷的水力特性形成的溶解氧空间分布使氧化沟的曝气区存在显著的氧限制条件,实现了同步硝化反硝化和除磷。 在对氧化沟工艺系统进行数值模拟的基础上,本研究选取曝气能耗、污泥产量以及出水水质超标率作为评价指标,提出两个无量纲的综合成本指数和综合效能指数,用于氧化沟污水处理系统的工艺评价和运行控制策略的优化研究。基于所提出的评价指标与综合指数,对工艺的曝气系统调控策略和剩余污泥排放策略进行情景分析,提出高效能低成本运行的优化调控方案。 通过情景分析,提出浅沟型氧化沟工艺的优化运行策略为:3~10月温度高于15°C时运行8台曝气转刷,其余时间段运行10台曝气转刷,同时剩余污泥排放量控制在250 m3/day。优化策略能够使出水NH4-N和TN的超标率分别低于5%和2%,保证出水TP的持续达标,与基准运行策略相比,在改善出水达标率的同时,可以节省曝气能耗约12%,降低污泥产量约2%。深沟型氧化沟工艺的最优运行策略是:运行5台曝气转盘以“111100100”模式运行用于曝气系统的控制,同时将剩余污泥排放量控制在200 m3/day。最优运行策略能够实现NH4-N和TP的出水超标率分别低于10%和30%,曝气能耗削减46%,而污泥产量不会显著增加。另外,对深沟型氧化沟工艺不同曝气调控策略进行动力学分析,结果表明:对曝气系统控制策略的调整,实质上是改变了氧化沟内缺氧/好氧的水力停留时间、供氧量的分配和溶解氧的空间分布,导致关键过程动力学行为的改变。
英文摘要:
      This study constructed a numerical simulation platform for the oxidation ditch (OD) system for wastewater treatment based on Bayesian inference approach, which was used for the simulation and process optimization. On the basis of simulator, IWA ASM2d model was employed to model two types of OD systems, and predict the nitrogen and phosphorus removal performance under current operational conditions. The model was calibrated by Bayesian inference approach. It shows that the calibrated model was reliable, and can be used for further optimization study. With the dynamic simulation, this study analyzed the kinetics and mass balance of nitrogen and phosphorus removal for the shallow ditch system. It indicated that the denitrifying phosphorus removal contributed significantly, and was predominant in the system. Meanwhile, the unique hydraulics due to the brush aerators leads to a DO spatial distribution, leading to substantial oxygen limiting conditions in the aerated zone, achieving simultaneous nitrification and denitrification as well as phosphorus removal. Based on the numerical simulation, this study selected aeration cost, sludge production and effluent violation as criteria, and proposed two non-dimensional unified cost index and performance index for the process assessment and operational strategy optimization. Scenario analysis was performed on the aeration and sludge discharge strategies to suggest optimal strategy with high efficiency and low costs. The optimal strategy for shallow ditch system was: 8 aerators for March to October at 15°C above, 10 for other periods, and 250 m3/day sludge discharge. This could achieve ammonium and TN effluent violation lower than 5% and 2% respectively, saving 12% of aeration costs, and reducing sludge production by 2%. As for the deep ditch system, optimal strategy was: 5 aerators with the mode 111100100, and 200 m3/day sludge discharge, which could achieve less violations of ammonium and TP (10% and 30%), saving 46% aeration costs without remarkable increase of sludge production. In addition, the kinetic analysis for deep ditch system show that adjusting the aeration strategy means to change the anoxic/aerobic HRT, oxygen supply, and DO spatial distribution, leading to significant shifts of key kinetics behaviors.
内容类型: 学位论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35167
Appears in Collections:环境水质学国家重点实验室_学位论文

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Recommended Citation:
李峥. 氧化沟污水处理系统的数值模拟与工艺优化[D]. 北京. 中国科学院研究生院. 2012.
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