School of Environmental Science and Engineering, Guangzhou, 510006, China.
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Water Res. 2019 Mar 15;151:243-251. doi: 10.1016/j.watres.2018.11.078. Epub 2018 Dec 3.
This study utilized physical adsorption and filtration of carbon nanotubes (CNTs) and laccases to fabricate biomimetic dynamic membrane (BDM) for the advanced treatment of dye wastewater. In BDM, the adsorption, enzymatic degradation and membrane separation demonstrated a synergism effect on pollutant removal. At first, the fabrication methods of BDM were investigated, and the mixed filtration for laccases and CNTs showed a better performance than the stepwise filtration. Furthermore, the operation parameters of BDM, including CNTs and laccase loading amounts, dye concentration, agitation speed and transmembrane pressure (TMP), were studied. Suitable CNTs and laccase amounts could reduce filtration resistance and increase catalysis efficiency, while moderate TMP and agitation speed were in favor of boosting the BDM structure for catalysis and permeability. Optimized operation parameters (CNT loading amount = 20 g m, laccase loading amount = 74.6 g m, agitation speed = 100 rpm, and TMP = 1.0 bar) sustained a high removal rate, and the flux was over 120 L m h, even for 7 operation cycle' tests. BDM exhibited an excellent dye removal rate, stable flux and great antifouling capacity, on the ground that adsorption saturation and foulant may be alleviated "online and in-situ" by the enzymatic degradation. Afterwards, the bionic layer on BDM, after absorption saturation and catalyst deactivation, could be eliminated rapidly by carrying out a simple backwash cleaning operation, then a new one could be fabricated immediately. Therefore, BDM is a good candidate for functional membrane materials in future water treatment.
本研究利用碳纳米管（CNTs）和漆酶的物理吸附和过滤作用，构建仿生动态膜（BDM），用于染料废水的深度处理。在 BDM 中，吸附、酶降解和膜分离对污染物去除表现出协同作用。首先，研究了 BDM 的制备方法，混合过滤漆酶和 CNTs 的性能优于分步过滤。此外，还研究了 BDM 的操作参数，包括 CNTs 和漆酶的加载量、染料浓度、搅拌速度和跨膜压力（TMP）。适当的 CNTs 和漆酶量可以降低过滤阻力并提高催化效率，而适中的 TMP 和搅拌速度有利于提高 BDM 的结构，促进催化和渗透。优化的操作参数（CNT 加载量为 20g/m，漆酶加载量为 74.6g/m，搅拌速度为 100rpm，TMP 为 1.0bar）维持了较高的去除率，通量超过 120L/m h，即使经过 7 个操作周期的测试也是如此。BDM 表现出优异的染料去除率、稳定的通量和良好的抗污染能力，这是因为酶降解可以“在线原位”缓解吸附饱和和污染物的积累。之后，当 BDM 的仿生层达到吸附饱和和催化剂失活时，可以通过简单的反冲洗清洗操作迅速去除，然后可以立即构建新的仿生层。因此，BDM 是未来水处理中功能膜材料的良好候选材料。
