污水土地处理的数值模拟
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摘要
本文通过与常规污水生化处理方法的对比,认为土地处理系统是一种低投资、低能耗、高效率的自然净化技术。针对目前土地处理系统设计和运行中的主观性和盲目性,提出了利用数值模拟技术实现较短时间内确定土地处理系统的适宜工艺参数,从而提高其处理效率,有效推动这一污水生态处理技术在我国的推广应用。并探讨了数值模型在土地处理系统的具体应用,为污水土地处理的数值模拟提供参考。
本文运用数值方法首先就弥散系数、吸附系数和降解系数这三个重要的溶质运移参数的变化对污水处理效果的影响进行了敏感性分析,讨论了污水处理效果对设计参数的依赖性;接着通过机械组成和室内人工快渗土柱实验,确定了COD运移的主要参数值,将实测数据与模拟结果比较,进行了土地处理系统数值模拟的可行性分析;最后将数值模拟应用到目前土地处理系统中应用最广的两种类型:人工快渗、人工湿地的处理过程中,其中针对人工快渗系统,模拟分析了快渗池的面积、厚度、水力负荷和水力负荷周期的变化对处理效果的影响,在此基础上确定了不同处理量不同处理要求条件下人工快渗系统的适宜设计参数值。而针对人工湿地,模拟分析了湿地的面积、厚度、植被(主要考虑植被的根深)、水力负荷和有机负荷的变化对处理效果的影响,确定了面积最小、水力负荷最大条件下的750m~3/d人工湿地系统的适宜设计参数值。通过上述应用,对通过数值技术模拟污水土地处理系统系统,进而设计污水土地处理参数和控制污水土地处理过程控制做了定量探讨和分析。
Compared with the normal wastewater biochemical treatment, wastewater land treatment thinks to be a natural purification technology of low investment, low energy consumption and high efficiency. Aiming at the subjectivity in the wastewater land treatment' s design and operation, it is advised to apply the numerical simulation technology to the wastewater land treatment, to determine the appropriate process parameters in a little time. It will provide scientific basis for improving treatment efficiency and ensuring a long-term operation effect. The practical application of the numerical simulation technology in wastewater land treatment has been discussed. This will offer important reference to the application of numerical simulation technology in wastewater land treatment.
Getting to know the dependence of wastewater treat effect on design and operation parameters, it has been firstly studied on the sensitivity analysis on relationship between treatment effect and three important solute transport parameters, such as dispersion coefficient, adsorption coefficient and degradation coefficient. Secondly, by mechanical composition and artificial rapid infiltration soil columns experiment in laboratory, the primary COD transport parameters are confirmed. Then it has been compared between experiment observation and simulation results. So the feasibility is studied of numerical simulation technology' s application in wastewater land treatment. Finally, the numerical simulation technology has been used into the most popular two types of land treatment, such as: artificial rapid infiltration land treatment system and artificial wetland land treatment system. According to the artificial rapid infiltration land treatment system, the relationship between treatment effect and the pool' s area and thickness, hydraulic load, hydraulic loading cycle are researched. On this basis, the appropriate design and operation permanents of the artificial rapid infiltration land treatment system are supplied on the condition of different treatment capacity and treatment demands. According to the artificial wetland land treatment system, the relationship between treatment effect and the wetland area and thickness, plant root length, organic load, hydraulic load are researched. On this basis, the appropriate design and operation parameters of the artificial wetland land treatment system are supplied on the condition of the 750m~3/d treatment capacity, smallest wetland area, highest hydraulic load and different treatment demands. Quantitative inquiry and analysis have been studied on simulating wastewater land treatment system by numerical technology, and then designing system parameters and controlling treatment process.
本文运用数值方法首先就弥散系数、吸附系数和降解系数这三个重要的溶质运移参数的变化对污水处理效果的影响进行了敏感性分析,讨论了污水处理效果对设计参数的依赖性;接着通过机械组成和室内人工快渗土柱实验,确定了COD运移的主要参数值,将实测数据与模拟结果比较,进行了土地处理系统数值模拟的可行性分析;最后将数值模拟应用到目前土地处理系统中应用最广的两种类型:人工快渗、人工湿地的处理过程中,其中针对人工快渗系统,模拟分析了快渗池的面积、厚度、水力负荷和水力负荷周期的变化对处理效果的影响,在此基础上确定了不同处理量不同处理要求条件下人工快渗系统的适宜设计参数值。而针对人工湿地,模拟分析了湿地的面积、厚度、植被(主要考虑植被的根深)、水力负荷和有机负荷的变化对处理效果的影响,确定了面积最小、水力负荷最大条件下的750m~3/d人工湿地系统的适宜设计参数值。通过上述应用,对通过数值技术模拟污水土地处理系统系统,进而设计污水土地处理参数和控制污水土地处理过程控制做了定量探讨和分析。
Compared with the normal wastewater biochemical treatment, wastewater land treatment thinks to be a natural purification technology of low investment, low energy consumption and high efficiency. Aiming at the subjectivity in the wastewater land treatment' s design and operation, it is advised to apply the numerical simulation technology to the wastewater land treatment, to determine the appropriate process parameters in a little time. It will provide scientific basis for improving treatment efficiency and ensuring a long-term operation effect. The practical application of the numerical simulation technology in wastewater land treatment has been discussed. This will offer important reference to the application of numerical simulation technology in wastewater land treatment.
Getting to know the dependence of wastewater treat effect on design and operation parameters, it has been firstly studied on the sensitivity analysis on relationship between treatment effect and three important solute transport parameters, such as dispersion coefficient, adsorption coefficient and degradation coefficient. Secondly, by mechanical composition and artificial rapid infiltration soil columns experiment in laboratory, the primary COD transport parameters are confirmed. Then it has been compared between experiment observation and simulation results. So the feasibility is studied of numerical simulation technology' s application in wastewater land treatment. Finally, the numerical simulation technology has been used into the most popular two types of land treatment, such as: artificial rapid infiltration land treatment system and artificial wetland land treatment system. According to the artificial rapid infiltration land treatment system, the relationship between treatment effect and the pool' s area and thickness, hydraulic load, hydraulic loading cycle are researched. On this basis, the appropriate design and operation permanents of the artificial rapid infiltration land treatment system are supplied on the condition of different treatment capacity and treatment demands. According to the artificial wetland land treatment system, the relationship between treatment effect and the wetland area and thickness, plant root length, organic load, hydraulic load are researched. On this basis, the appropriate design and operation parameters of the artificial wetland land treatment system are supplied on the condition of the 750m~3/d treatment capacity, smallest wetland area, highest hydraulic load and different treatment demands. Quantitative inquiry and analysis have been studied on simulating wastewater land treatment system by numerical technology, and then designing system parameters and controlling treatment process.
引文
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