好氧颗粒污泥吸附Zn^(2+)的研究

Study on Adsorption of Zn^(2+) by Aerobic Granular Sludge

以不同粒径的好氧颗粒污泥作为吸附剂吸附水中的重金属Zn2+,分析了颗粒污泥的粒径在不同初始Zn2+浓度和初始污泥浓度下对吸附效果的影响;同时以活性污泥为对照,对比研究了两种吸附剂对重金属Zn2+的吸附效果。研究发现,好氧颗粒污泥具有多孔结构,吸附过程满足一级可逆反应方程;小颗粒的吸附容量较大颗粒的高;颗粒污泥的解吸率均低于普通活性污泥的。可见,好氧颗粒污泥可作为含Zn2+废水的生物吸附剂。

Aerobic granular sludge with different particle sizes was used for adsorption of Zn2＋ in wastewater. The effects of particle size on adsorption under different initial Zn2＋ concentrations and sludge concentrations were analyzed. The adsorption efficiency of Zn2＋ by aerobic granular sludge was compared with that by activated sludge. The results show that the aerobic granular sludge has porous structure, and its adsorption follows the first order kinetic model. The smaller granules have a higher ad- sorption capability than larger granules. All the aerobic granular sludge has lower desorption rate than traditional activated sludge, and can be used as a biosorbent for the removal of Zn2 ＋ from wastewater.