复合型固定化微生物载体的选择及其养殖废水脱氮性能研究

Selection of Composite Immobilized Carrier and its Performance of Denitrification for Aquaculture Wastewater

以人工沸石、珊瑚砂和凹凸棒土为微生物载体,使用海藻酸钠(SA)和聚乙烯醇(PVA)联合包埋活性污泥,考察SA和PVA浓度对固定化小球性能影响,确定最佳固定化配比.分别以人工沸石、珊瑚砂、凹凸棒土为载体制备的固定化小球和传统活性污泥对模拟养殖废水脱氮性能进行比较研究.结果表明:2%SA和1%PVA联合包埋的固定化小球性能最佳;同样的条件下活性污泥的脱氮效率为83.30%,以人工沸石、珊瑚砂和凹凸棒土为载体的固定化小球的脱氮效率分别为85.74%、78.52%和92.58%.实验结果表明人工沸石和凹凸棒土为载体的固定化小球比传统的活性污泥法处理养殖废水效果更好,但以珊瑚砂为载体的固定化小球比活性污泥处理效果差.

With three kinds of natural materials （artificial zeolite, coral sand and attapulgite） as immobilized cartier, immobilized microbe beads were prepared by the entrapping method. The effects of SA and PVA on the performance of immobilized microbe beads were explored and the optimum immobilization conditions were determined. At the same time, the denitrification effects of the immobilized microbe beads prepared with three kinds of natural materials with activated sludge on aquaculture wastewater were compared. The experimental results showed that denitrification efficiencies of aquaculture wastewater treated by immobilized microbe beads and prepared with 2% SA and 1% PVA were 83.30% of activated sludge, 85.74% of artificial zeolite, 78.52% of coral sand and 92.58% of attapulgite, respectively. It was found that denitrifieation efficiency of immobilized microbe beads prepared with artificial zeolite and attapulgite is higher than that of coral sand and activated sludge.