Water Research Institute, C.N.R., Via Salaria km 29.300, 00016 Monterotondo, Rome, Italy.
Water Sci Technol. 2010;62(4):776-82. doi: 10.2166/wst.2010.922.
In this paper, a comparison is provided between liquid-liquid and liquid-solid partitioning systems applied to the removal of high concentrations of 4-nitrophenol. The target compound is a typical representative of substituted phenols found in many industrial effluents while the biomass was a mixed culture operating as a conventional Sequencing Batch Reactor and acclimatized to 4-nitrophenol as the sole carbon source. Both two-phase systems showed enhanced performance relative to the conventional single phase bioreactor and may be suitable for industrial application. The best results were obtained with the polymer Hytrel which is characterized by higher partition capability in comparison to the immiscible liquid solvent (2-undecanone) and to the polymer Tone™. A model of the two systems was formulated and applied to evaluate the relative magnitudes of the reaction, mass transfer and diffusion characteristic times. Kinetic parameters for the Haldane equation, diffusivity and mass transfer coefficients have been evaluated by data fitting of batch tests for liquid-liquid and liquid-solid two phase systems. Finally, preliminary results showed the feasibility of polymer regeneration to facilitate polymer reuse by an extended contact time with the biomass.
本文比较了应用于去除高浓度 4-硝基苯酚的液-液和液-固分配系统。目标化合物是许多工业废水中存在的取代酚的典型代表，而生物质是一种混合培养物，作为传统的序批式反应器运行，并适应 4-硝基苯酚作为唯一的碳源。与传统的单相生物反应器相比，这两种两相系统均表现出了更高的性能，可能适用于工业应用。其中最好的结果是使用聚合物 Hytrel 获得的，与不混溶的液体溶剂（2-十一酮）和聚合物 Tone™相比，它具有更高的分配能力。建立了这两个系统的模型，并应用于评估反应、传质和扩散特征时间的相对大小。通过对液-液和液-固两相系统的间歇试验进行数据拟合，评估了Haldane 方程的动力学参数、扩散系数和传质系数。最后，初步结果表明，通过延长与生物质的接触时间，聚合物再生以促进聚合物再利用是可行的。
