【摘要】 基于废水厌氧生物处理技术的三阶段原理,自行设计一种处理低浓度废水的多段内循环厌氧反应器。采用Fluent软件对反应器内气液两相流进行数值模拟研究,重点研究曝气盘进气速度、高径比和曝气盘安装高度对气液两相的流态影响,以此探索反应器达到泥水充分混合的最佳工艺与结构设计参数。根据模拟结果,曝气盘进气速度为2.68 m/s,高径比为1.75,曝气盘安装高度为20 mm时,反应器内泥水混合和空间利用率达到最大化。将本反应器应用于低浓度屠宰废水处理,当水力停留时间为29 h,第一、第二和第三反应室的COD平均容积负荷为1.72、 1.42和0.69 kg[COD]/(m3·d)时,日处理量可达1.44 t, COD去除率可以持续稳定在50%以上,最佳达到75%。更多还原

【Abstract】 A multistage internal recycle anaerobic reactor for low concentration wastewater treatment was designed based on three-stage theory of anaerobic biological technology for wastewater treatment. A study of numerical simulation of gas-liquid two-phase flow of the reactor was carried out using software Fluent, the influence of air inflow velocity, height-diameter ratio and installation height of aeration dish on flow state of gasliquid two-phase were emphatically investigated, so as to explore the optimal process and structure design parameters of the reactor when reaching sludge and water intensive mixing. According to the simulation results, it could be seen that, for the aeration dish, when the air inflow ratio was 2.68 m/s, the height-diameter ratio was1.75, the installation height was 20 nm, sludge-water mixing degree and space utilization ratio of the reactor reached maximum. Using the said kind of reactor to treat low concentration slaughter wastewater, when the HRT was 29 h, the average volumetric loading rate of the first, the second and the third reaction chambers were 1.72,1.42 and 0.69 kg [COD]/(m3·d) respectively, the daily treatment capacity reached 1.44 t, the removal rate of COD could sustained above 50% and with the best rate of 75%.更多还原