Institute of Environmental Health and Ecological Security, School of the Environment and Safety Engineering, Jiangsu University, Jiangsu, 212013, China.
Department of Civil Engineering, National Institute of Technology, Gunma College, Gunma, 371-8530, Japan.
Environ Sci Pollut Res Int. 2019 Oct;26(29):29789-29798. doi: 10.1007/s11356-019-06133-7. Epub 2019 Aug 12.
In this study, environment-friendly inorganic basalt fiber (BF) was used as bio-carrier for wastewater treatment. To enhance the bio-affinity, raw BF was modified by grafting the diethylamino functional groups to make the surface more hydrophilic and electro-positive. Contact angle and zeta potential of modified basalt fiber (MBF) were characterized. The capacity of MBF bio-carriers was evaluated by microorganism immobilization tests. To explain the mechanism of capacity enhancement by modification, the profiles of total interaction energy barrier between raw BF (or MBF) and bacteria (Escherichia coli, E. coli) were discussed based on the extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The results showed the contact angle of fiber decreased from 89.71° to 63.08° after modification, and zeta potential increased from - 18.53 to +10.58 mV. The microorganism immobilization tests showed that the surface modification accelerated the initial bacterial adhesion on fiber. The total interaction energy barrier between MBF and E. coli disappeared as a result of electrostatic and hydrophilic attractive forces, and enhanced the irreversible adhesion. MBF bio-carrier medium provides a promising alternative to conventional bio-carrier materials for wastewater treatment. Graphical abstract.
在这项研究中，环境友好型无机玄武岩纤维（BF）被用作废水处理的生物载体。为了增强生物亲和力，对原始 BF 进行了接枝二乙氨基官能团的改性，使表面更加亲水和带正电。对改性玄武岩纤维（MBF）的接触角和动电位进行了表征。通过微生物固定化试验评价了 MBF 生物载体的容量。为了解释通过改性增强容量的机制，根据扩展的德热纳-朗道-维尔韦尔-奥弗贝克（DLVO）理论，讨论了原始 BF（或 MBF）与细菌（大肠杆菌，E. coli）之间总相互作用能垒的分布。结果表明，纤维的接触角从 89.71°降低到 63.08°，动电位从-18.53 mV 增加到+10.58 mV。微生物固定化试验表明，表面改性加速了纤维上初始细菌的附着。由于静电力和亲水力的吸引，MBF 和 E. coli 之间的总相互作用能垒消失，从而增强了不可逆的附着。MBF 生物载体介质为废水处理提供了一种有前途的传统生物载体材料的替代方案。
