循环流速对活性污泥水解-好氧循环工艺处理活性艳蓝KN-R废水的影响

Effect of Recycling Rate on Performance of Hydrolytic Aerobic Recycling Activated Sludge Process in Treating Reactive Dye KN-R Wastewater

采用活性污泥水解-好氧循环工艺降解活性艳蓝KN-R废水,研究了水解、好氧反应器间循环流速对废水色度和化学需氧量(COD)去除效果的影响以及水解反应器中挥发性脂肪酸(VFA)的变化规律。研究结果表明,废水色度和COD去除率随循环流速增加呈现先增大后减小的趋势。循环流速过大,不利于COD和色度的去除。但提高循环流速,有助于减少水解反应器中VFA的积累。紫外-可见光谱分析显示,经过24h处理后的废水,活性艳蓝KN-R的特征吸收峰降至最低,表明了活性艳蓝KN-R得到了生物降解。

A hydrolytic-aerobic recycling activated sludge process was developed to treat anthraquinone reactive blue KN-R wastewater. The effect of recycling rate between the hydrolytic reactor and aerobic one on color and chemical oxygen demand （COD） as well as volatile fatty acids （VFA） in the wastewater was investigated. The results indicated that the removal efficiency of color and COD firstly increased but then declined with the increase of recycling rate, while higher recycling rate was unfavorable for either the removal of color or that of COD. The accumulation of VFA in the hydrolytic reactor was decreased with the increasing of recycling rate. UV-visible spectroscopic analysis showed that the reactive blue KN-R in the wastewater was degraded to the minimum after 24 hours＇ treatment with the hydrolytic-aerobic recycling activated sludge process.