Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road No. 1, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road No. 1, Nanjing 210098, China.
J Hazard Mater. 2014 Jul 15;276:415-21. doi: 10.1016/j.jhazmat.2014.05.063. Epub 2014 Jun 2.
A novel bio-reactive capping barrier composed of polysulfone/granular activated carbon (PS/GAC) hybrid membranes immobilized with microorganism was developed for the remediation of nitrobenzene in sediments. The SEM observation demonstrated that all the membranes had a dense top layer and a porous sublayer, this structure can block the transfer of nitrobenzene from sediment to the water and enhance nitrobenzene degradation. Adsorption behaviors of nitrobenzene on membranes showed that the membrane impregnated with GAC had better performance than the pure PS membrane. The values of Kads increased from 4.64 (without GAC) to 6.19 (1:2 GAC). 20mg/L nitrobenzene can be completely degraded by Pseudomonas putida immobilized on membranes. The biodegradation rate of activated carbon-filled membrane system was little higher than that of pure PS membrane system. For remediation experiments, only about 21.7, 28.3 and 43.9% of nitrobenzene in the sediment was removed by the end of the experiments for PS/GAC membrane, sand-alone and sand amended with activated carbon capping systems, respectively. While for PS/GAC+microorganisms capping system, more than 70% of nitrobenzene loss was observed. This demonstrated that nitrobenzene can be effectively removed from contaminated sediments by microbial degradation in the bio-reactive capping system.
一种新型的生物反应性封盖屏障，由固定有微生物的聚砜/颗粒活性炭（PS/GAC）混合膜组成，用于修复沉积物中的硝基苯。SEM 观察表明，所有膜都具有致密的顶层和多孔的底层，这种结构可以阻止硝基苯从沉积物向水中转移，并增强硝基苯的降解。膜对硝基苯的吸附行为表明，负载 GAC 的膜比纯 PS 膜具有更好的性能。Kads 值从 4.64（无 GAC）增加到 6.19（GAC 为 1:2）。20mg/L 的硝基苯可以被固定在膜上的假单胞菌完全降解。填充活性炭的膜系统的生物降解速率略高于纯 PS 膜系统。对于修复实验，在实验结束时，PS/GAC 膜、单独的砂和添加活性炭封盖系统分别仅去除了沉积物中约 21.7%、28.3%和 43.9%的硝基苯，而 PS/GAC+微生物封盖系统中，观察到超过 70%的硝基苯损失。这表明在生物反应性封盖系统中，微生物降解可以有效地从受污染的沉积物中去除硝基苯。
