外循环厌氧处理工艺中布水和三相分离的改进研究

污水处理中的布水设备和三相分离设备存在很多缺点,通过旋流配水装置和传统配水装置、小间距斜板三相分离装置和传统三相分离装置的比较试验,研究了旋流配水装置和小间距斜板三相分离装置的性能.研究结果表明:在相同膨胀率的条件下,旋流配水装置所需的回流量小,能耗相对较少;在水力上升流速为8 m/h时,采用旋流配水装置进水时,污泥分布曲线较平缓,污泥在高度上分布较均匀,而采用传统配水装置进水时,污泥主要分布在反应器底部,污泥浓度分布不均匀;在上升流速相同的情况下,采用小间距三相分离装置的反应器出水携带的颗粒污泥浓度较小;在相同的进水COD浓度时,小间距三相分离装置分离的沼气量较多.改进的布水和三相分离装置的性能明显优于传统的布水和三相分离装置.

Study on improvement of water distribution and three-phase in exterior circulation anaerobic process

Water distribution devices and three-phase separators have many disadvantages.This study compared cyclone-flow water distribution devices and short distance three-phase separator with conventional water distribution devices and conventional three-phase separators,and investigated the performance and advantages of cyclone-flow water distribution device and short distance three-phase separator.The experimental results showed that circumfluence and energy consumption were less in the same expanding ratio in the reactor with cyclone-flow water distribution device than conventional water distribution devices.When upward velocity was 8 m/h,the distribution curve of sludge concentration was gentle,and sludge distribution was uniform in the reactor with cyclone-flow water distribution device.Sludge were mainly distributed in the bottom of the reactor and sludge distribution was worse in the reactor with cyclone-flow water distribution device.Outflow sludge concentration was lower at the same upward velocity in the short distance three-phase separator than conventional three-phase separators.Biogas production was bigger at the same influent COD in the short distance three-phase separator.The performance of cyclone-flow water distribution device and short distance three-phase separator was better than conventional device and conventional separators.