垃圾渗滤液对厌氧颗粒污泥稳定性的影响

Effect of landfill leachate on stability of anaerobic granular sludge

在升流式厌氧反应器中,分别以模拟废水和最优进水浓度渗滤液持续进水,探讨COD、NH＋4-N和SO2-4浓度对反应器内颗粒污泥的稳定性的影响。结果表明,按照优化浓度进水,可以在一定程度上提高了厌氧生物处理效率,COD、NH＋4-N和SO2-4去除率分别约为60%、11%和42%。渗滤液中微量元素（如Fe、Co和Ni等）有利于提高污泥浓度,增大反应器内生物量。改变垃圾渗滤液进水的COD、NH＋4-N和SO2-4浓度,使得颗粒污泥多处于0.9～1.6 mm之间,具有高传质效率和不易破碎的特性。污泥颗粒的沉降速度保持在28.52～67.87 m·h-1之间,属于沉降性能良好的污泥。以最优进水浓度渗滤液为进水条件的反应器内的颗粒污泥浓度、粒径和沉降速度都要比模拟废水组更好,说明渗滤液中的微量元素存在,有利于颗粒污泥的稳定。

Effects of the concentrations of COD,NH＋4-N,and SO2-4on the stability of granular sludge were studied in upflow anaerobic reactors continuously fed with simulated wastewater and leachate at an optimal feeding concentration. The results showed that the efficiency of anaerobic treatment could be improved by adjusting the concentrations of COD,NH＋4-N,and SO2-4in the feed of the landfill leachate. The removal amounts of COD,NH＋4-N,and SO2-4were approximately 60%,11%,and 42%,respectively. Trace elements（ such as Fe,Co,and Ni） were beneficial for improving the sludge concentration and increasing the biomass in the reactor. Once the size of the granular sludge was converted to mostly in the range of 0. 9 to 1. 6 mm by changing the concentration of COD,NH＋4-N,and SO2-4in the feed of the landfill leachate,high mass transfer efficiency and low fragility could be achieved. The sludge exhibited good sedimentation properties when the sedimentation speed of the sludge particles was in the range of 28. 52 to 67. 87 m·h- 1. The sludge concentration,particle size,and sedimentation speed in the reactors fed by the leachate with the optimal feeding concentration were all better than those of the simulated wastewater,indicating that the trace elements are conducive to the stability of the granular sludge.