Select two kinds of active carbon and oyster shel materials as ifxation carrier and makes study on capability of COD removal in UASB system. The result shows that when the system for high columniation, circulation and increase of carrier ifl ing volume is selected, then COD with high concentration organic wastewater can be wiped off. But when the ifl ing carrier is higher, the circulating system is hard to realize and there exists possibility of suffocation.%选用活性炭、海砺壳2种材料作为固定化载体，对改良型UASB系统去除COD的性能进行研究，结果表明选择既高柱又循环且增加载体填充体积的系统，可有效去除高浓度有机废水的COD，但当填充载体过高时，循环系统难以实现，并存在憋气的可能。
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