Numerical Simulation Of Sessile Worm Reactor

Worm-reactor is a new technology of sludge treatment. Scholars national and abroad have researched the factors like temperature, water quality, pH value and inverse flow ratio. They have made agree with each other on all of these points, however, researches on the movement law for gas-liquid two-phase flow in worm-reactor is lack, the oxygen transfer, efficiency, momentum and energy between phase as well as the interaction among turbulent components are all unqualified, applications of worm-reactor also need theory, so it is especially essential to experimentalism and simulation analysis. The research establishes the influence of aeration type in treating wastewater by means of the combination of experimental research and numerical simulation on the gas-liquid flow.This paper take the aerate velocity as a boundary condition, obtained gas-liquid two-phase flow velocity field of different conditions by numerical simulated with k-εmodel and Mixture model provided by FLUENT. Measured density of sludge demand at specific moment, results of numerical simulation was verified. Finally this paper proposed the most effective aeration pattern, supply practice of worm-reactor theoretical foundation.Research suggests that gas rate decrease and little change in turbulence intensity when aeration increases, volume fraction of air and turbulence intensity increases when filler plate rotation increases, the distribution is uniform. Turbulent parameters distributed normally in reactor with the increase of aeration time, while more uniformly turbulent flow distributed with longer aeration under intermittent aeration condition. Only extended aeration, turbulent parameters increased and distributed more uniformly. Above according to evaluation index of sludge treatment process, that is smaller speed, higher gas rate, more uniform turbulent parameter distribute, obtained optimization parameters, illustrate by experiment. Simulation results are consistent with experimental results, which is reliable.This text deepen our understanding of sessile worm-bed reactor through analyzing its flow field, optimal parameters of sludge treatment process are determined based on numerical simulation experiments, provide references for the optimization of design and operation of the entire wastewater treatment process.