久置、好氧及厌氧污泥对亚甲蓝的吸附性能研究

ADSORPTION OF METHYLENE BLUE ON LONG-PLACED SLUDGE, AEROBIC ACTIVATED SLUDGE, AND ANAEROBIC ACTIVATED SLUDGE

用久置污泥、好氧活性污泥、厌氧活性污泥对阳离子染料亚甲蓝进行吸附研究,考察了吸附平衡时间、吸附等温线、吸附动力学、pH、离子浓度、污泥量对吸附亚甲蓝的影响。结果表明,3种污泥对亚甲蓝都具有良好的吸附效果,好氧活性污泥对亚甲蓝的吸附等温式同时符合Langmuir和Freundlich方程,久置污泥和厌氧活性污泥对亚甲蓝的吸附更符合Freundlich方程;3种污泥对亚甲蓝的吸附行为符合假2级反应动力学;pH<2时3种污泥对亚甲蓝的去除率偏低,久置污泥和好氧活性污泥在pH3～12、厌氧活性污泥在pH5～12对亚甲蓝的吸附性能稳定;10mg·L-1的醋酸钠可以有效促进3种污泥对亚甲蓝的吸附,促进作用随着醋酸钠浓度的升高逐渐减弱,但高浓度的醋酸钠对亚甲蓝的吸附没有明显影响。

Long-placed sludge （LPS）, aerobic activated sludge （AAS） and anaerobic activated sludge （AAAS） were used as adsorbents in binding of Methylene Blue （MB）. The effect of ion concentration, equilibrium time, pH, sludge dosage, adsorption kinetics and adsorption isotherms had been studied. It was found that the 3 kinds of sludge had good adsorption efficiency of MB; and the adsorption isotherm of MB by AAS satisfied both Langmuir and Freundlich models, while the adsorption of MB by LPS and AAAS satisfied Freundlich model more than Langmuir model. The pseudo second-order kinetic model could better describe the adsorption of MB on the three kinds of sludge. When the pH was lower than 2, the 3 kinds of sludge had lower adsorption efficiency; when the pH was between 3 - 12, the LPS and AAS had steady adsorption efficiency; and the AAAS had when the pH was between 5 - 12. When the concentration of sodium acetate was 10 mg. L^-1, the 3 kinds of sludge had the optimal effect to adsorb MB, but high concentration of sodium acetate had no significantly influence on the adsorption of MB.