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醋酸纤维素包埋非水溶性介体催化强化生物反硝化特性

Keywords: 反硝化,氧化还原介体,醋酸纤维素,催化

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Abstract:

利用醋酸纤维素包埋法固定非水溶性醌类介体,研究其催化强化Paracoccusversutus菌株GW1的反硝化作用。结果表明,醌浓度在26.7mmol/L时,固定化蒽醌(AQ)、1-氯蒽醌(1-AQ)、2-氯蒽醌(2-AQ)、1,5-二氯蒽醌(1,5-AQ)、1,8-二氯蒽醌(1,8-AQ)和1,4,5,8-四氯蒽醌(1,4,5,8-AQ)催化反硝化效率依次为:1,5-AQ>1,8-AQ>1,4,5,8-AQ>AQ>1-AQ>空白对照>2-AQ。反应10h时,1,5-AQ可使硝酸盐去除率比空白对照提高1.84倍;硝酸盐氮反硝化动力学拟合为零级反应,其速率常数Kx随1,5-AQ浓度的增加均呈线性增加(Kx=0.1885C1,5-AQ+8.378);水中溶解氧会降低GW1菌反硝化的效果;投加1,5-AQ的反硝化体系中亚硝酸盐积累的最大值比不投加介体的低48.3%;醋酸纤维素介体小球经过4次的重复利用,催化效果始终是空白对照的1.5倍以上。醋酸纤维素固定化非水溶性醌可以有效加速生物反硝化,表明其是一种较优的醌固定化方法,具有良好的应用价值。

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