重力流污水管网流态条件对沉积相碳/硫生化反应过程影响机制与模型

The biochemical reaction processes of carbon and sulfur in sediment caused the serious problems such as corrosion and odor in sewage system. However, the dynamic flow drive the significant variation of operation situation of sewage system. And the understanding about the influence mechanism of flow on the biological and chemical reaction processes in sediment of sewage system lacks till now. Therefore, the project aims to deepen the understanding about influence mechanism of flow on the biological and chemical processes in sediment of sewage system. The study will be conducted based on the pilot/lab-scale drainage pipe running combined with field test. The influence of flow condition on the pollutant conveyance and transformation between the liquid and gas phase, sediment formation and movement and accumulation within drainage pipe, biochemical kinetic of carbon and sulfur in in-situ environment of sediment will be estimated, independently. Then, a comprehensive evaluation model described the influence mechanism of flow on the biochemical processes of carbon and sulfur in sediment will be developed. The model parameters calibration will be carried out based on the serial tests in the study.The model will be verified by the simulation with the field test of sewage system.The study will take advantage in the optimal control of biochemical process of carbon and sulfur in sediment against the problems in sewage system.

重力流污水管网沉积相碳/硫生化反应过程会导致腐蚀恶臭等诸多管网问题，而管网流态动态变化是影响管网运行环境的主要因素，目前流态变化对沉积相生化反应过程的影响机制尚不清楚。因此，本项目拟基于现场实验与实验室模拟管道运行实验，分别从管网宏观污染物输移过程(气、液相间)、单元管段沉积物动态迁移累积(液、固相间)、沉积相内微观生化反应动力学三个层面，系统深入解析流态条件对沉积相碳/硫生化反应过程影响机制，在此基础上建立流态条件对沉积相生化反应过程影响的综合评价机制模型，校准模型参数的取值范围，并以实际管网进行模拟校验。相关研究成果对于实现管网沉积相生化反应过程的优化控制具有重要意义。

以重力流污水管网沉积相碳/硫生化反应过程为对象，系统深入研究了管网动态流态条件对沉积相生化反应过程的影响机制。首先结合典型排水管网运行特征，获取管网动态运行条件下的液相典型物质变化特征及其气相硫化氢波动规律，进而基于实验室模拟实验探究流态条件对沉积物迁移累积及其生化反应过程的影响机制，运用DGT技术创新揭示了沉积相表层活性区域微观物质传输过程及其生化活性控制机制，最终建立动态流态条件下的沉积相碳/硫生化反应过程影响综合模型，获得关键模型参数的取值范围，并应用于指导实际管网运行过程硫化氢产生的模拟控制。