Dimensionality Reduction of High-solid Anaerobic Digestion Flow Pattern: Flow Velocity Distribution Model and Control Strategy

High-solid anaerobic digestion (HSAD) can be used to treat organic waste. However, the operating stability is limited by the hydraulic conditions; therefore, regulation is essential. The flow field contains a large amount of information that cannot be directly regulated. Dimension reduction research in HSAD could simplify hydrodynamic regulation by removing redundant information from the flow field to reduce the dimensionality. However, to date, no relevant studies have been conducted. In this study, dimension reduction research was conducted to simplify the regulation of the hydraulic conditions of HSAD by constructing a mathematical model based on the simulation results. The HSAD flow velocity distribution model was first proposed, which features the mixing efficiency of the reactor. In addition, an HSAD flow control model with a fitting error below 10% was proposed. The controlled hydraulic enhancement strategy for HSAD in this study provides new insights into mixing performance.