Ca2+对上流式多级厌氧反应器处理蔗渣渗滤液的影响

研究了上流式多级厌氧反应器(UMAR)处理蔗渣渗滤液过程中Ca2+浓度对反应器运行特性和颗粒污泥性质的影响。结果表明,对于蔗渣渗滤液而言,进水中低浓度的Ca2+浓度(80～300 mg/L)对颗粒污泥产甲烷活性无抑制,COD去除率最高可达93.3%;Ca2+浓度达到500 mg/L以上时,对厌氧颗粒污泥的活性有抑制作用;随着Ca2+浓度进一步升高,抑制作用加强,污泥灰分明显升高,活性成分下降,COD去除效率明显降低,污泥粘结沉积在反应器底部,导致系统内循环出现障碍。因此,在实际生产中应减少废水中Ca2+的引入量。

Effects of calcium concentrations on up-flow multi-stage anaerobic reactor in treating bagasse wastewater

In the up-flow multi-stage anaerobic reactor(UMAR),the effect of different Ca2+ concentrations on the reactor’s performance and the characteristic of anaerobic granular sludge in treating bagasse wastewater were studied.The results showed that,with bagasse wastewater,the lower Ca2+ concentrations(80~300 mg/L) in the influent had no inhibitory effect on the specific methanogenic activity(SMA)of sludge,and the high COD removal efficiencies(93.3%) can be attained.When the Ca2+ concentration was over 500 mg/L,it had slight inhibitory effect on the specific methanogenic activity of sludge.With the increasing of Ca2+ concentrations,the ash content of sludge increased significantly,both the specific methanogenic activity of sludge and COD removal efficiency decreased.The agglomeration process easily took place and caused severe operational problems.For the reason,it is necessary to decrease the Ca2+ concentrations of bagasse wastewater.