双酚A在厌氧污泥上吸附行为的研究

采用批式实验研究了低浓度的内分泌干扰物双酚A在厌氧污泥上的吸附行为.实验采用高温灭菌的方法对活性污泥灭活以减小污泥降解对吸附实验的影响.研究发现,厌氧污泥对 BPA 的吸附很快,15min的吸附量可达最大吸附量的89.1%. BPA的吸附等温线可以较好地用线性模型以及Freundlich模型来描述,其在温度为10-30℃之间的有机碳归一化分配系数在 665～878的范围内. MLSS对BPA的吸附去除率有较大的影响,随着MLSS的增加, BPA 吸附去除率增加.通过吸附热力学的研究可以推断, BPA 在厌氧污泥上的吸附过程以物理吸附为主,主要是一个分配过程.污泥解吸实验表明BPA在厌氧污泥上的吸附是部分可逆的.

Sorption Behavior of Bisphenol A on Anaerobic Sludge

Batch experiments were conducted to investigate the sorption behavior of bisphenol A (BPA) with low concentration on anaerobic sludge. The autoclaved inactivated sludge was used to minimize the influence of degradation of activated sludge. The results showed that the sorption of BPA on anaerobic sludge was a quick process. Anaerobic sludge had achieved 89.1% of the maximum sorption capacity at 15 min. The sorption isotherms of BPA were fitted well by Freundlich and linear sorption models. The sorption coefficients normalized by organic carbon contents were in the range of 665-878 at 10-30 degrees C. MLSS had significant effect on the sorption behavior. With the increase in MLSS, the sorption removal efficiency increased. Through the determination of thermodynamics parameters of BPA, it can be concluded that the sorption of BPA on the anaerobic sludge was mainly a physical process and partitioning between the water and sludge phases played a dominant role. Desorption tests showed that BPA sorption on anaerobic sludge was partially reversible.