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681.
细菌Rieske型非血红素铁加氧酶研究进展 总被引:2,自引:2,他引:2
细菌Rieske型非血红素铁加氧酶是催化芳香化合物好氧降解第一步反应的酶,能够激发好氧环境下大量芳香或取代芳香化合物的生物降解,同时还可作为有机化合物的合成子.这是一类新型且丰富的酶资源,在受污环境的生物修复方面有着巨大的潜力,并且符合“绿色化学”的要求.本文综述了该类酶的分类、晶体结构、作用机理及其基因改造等最新研究进展. 图4表1参17 相似文献
682.
Sanjena Narayanasamydamodaran Jian e Zuo Haiteng Ren Nawnit Kumar 《Frontiers of Environmental Science & Engineering》2021,15(4):66
683.
Weiying Li Yu Tian Jiping Chen Xinmin Wang Yu Zhou Nuo Shi 《Frontiers of Environmental Science & Engineering》2022,16(6):72
684.
Xiaoge Huang Lihao Chen Ziqi Ma Kenneth C. Carroll Xiao Zhao Zailin Huo 《Frontiers of Environmental Science & Engineering》2022,16(12):151
685.
A sequential zero valent iron and aerobic biodegradation treatment system for nitrobenzene 总被引:27,自引:0,他引:27
The remediation of nitroaromatic contaminated groundwater is sometimes difficult because nitroaromatic compounds are resistant to biodegradation and, when they do transform, the degradation of the products may also be incomplete. A simple nitroaromatic compound, nitrobenzene, was chosen to assess the feasibility of an in situ multi-zone treatment system at the laboratory scale. The proposed treatment system consists of a zero valent granular iron zone to reduce nitrobenzene to aniline, followed by a passive oxygen release zone for the aerobic biodegradation of the aniline daughter product using pristine aquifer material from Canadian Forces Base (CFB) Borden, Ontario, as an initial microbial source. In laboratory batch experiments, nitrobenzene was found to reduce quickly in the presence of granular iron forming aniline, which was not further degraded but remained partially sorbed onto the granular iron surface. Aniline was found to be readily biodegraded with little metabolic lag under aerobic conditions using the pristine aquifer material. A sequential column experiment, containing a granular iron reducing zone and an aerobic biodegradation zone, successively degraded nitrobenzene and then aniline to below detection limits (0.5 microM) without any noticeable reduction in hydraulic conductivity from biofouling, or through the formation of precipitates. 相似文献
686.
超声波/纳米铁协同降解氯代苯酚的试验 总被引:8,自引:0,他引:8
通过间歇试验对超声波/纳米铁协同降解氯代苯酚(CPs)废水进行了研究,结果表明,超声波/纳米铁协同对CPs的降解率明显高于单纯超声波和单纯纳米铁的降解率;协同体系、单纯超声波和单纯纳米铁降解CPs均符合准一级反应动力学,协同体系的降解速率较单纯超声波提高了5.1-5.6倍,较单纯纳米铁提高了17.7~21倍,并且比它们的几何迭加值高4倍以上;氯代苯酚降解的准一级速率常数和降解率满足以下规律:PEP〉2,4,5-TCP〉2,4-DCP〉3-CP;探讨了混合废水的降解:在混合废水体系中,结构易裂解的优先降解,然后为浓度高的优先降解。 相似文献
687.
M. Amine Dahmani Kunchang Huang George E. Hoag 《Water, Air, & Soil Pollution: Focus》2006,6(1-2):127-141
This study has been conducted at the University of Connecticut (UCONN) in connection with the USEPA Superfund Innovative Technology
Evaluation (SITE) program to evaluate a chemical oxidation technology (sodium persulfate) developed at UCONN. A protocol to
assess the efficacy of oxidation technologies has been used. This protocol, which consists of obtaining data from a treatability
study, tested two in-situ chemical oxidation technologies that can be used on soil and groundwater at a site in Vernon, Connecticut.
Based on the treatability report results and additional field data collected at the site, the design for the field implementation
of the chemical oxidation remediation was completed. The results indicate that both sodium persulfate and potassium permanganate
were able to effectively degrade the target VOCs (i.e., PCE, TCE and cis-DCE) in groundwater and soil-groundwater matrices.
In the sodium persulfate tests (120 hrs), the extent of destruction of target VOCs was 74% for PCE, 86% for TCE and 84% for
cis-DCE by Na2S2O8 alone and 68% for PCE, 76% for TCE, and 69% for cis-DCE by Fe(II)-catalyzed Na2S2O8. The results demonstrate the sodium persulfate's ability to degrade PCE, TCE and cis-DCE. It is expected that given sufficient
dose and treatment time, a higher destruction rate of the dissolved phase contamination can be achieved. The data also indicates
that the catalytic effect of the iron chelate on persulfate chemistry was much less pronounced in the soil-groundwater matrix.
This indicates an interaction between the iron chelate solution and the soil, which may have resulted in a lower availability
of the chelated iron for catalysis. The study showed that the remediation of the VOCs-contaminated soil and groundwater by
in-situ chemical oxidation using sodium persulfate is feasible at the Roosevelt Mills site. As a result, the USEPA SITE program
will evaluate this technology at this site. 相似文献
688.
The cycling of iron and sulfur in mine tailings depends on various chemical and microbial reactions. The present study was undertaken in order to assess the role played by populations of sulfate-reducing bacteria (SRB) on the fate of Fe and SO4
2- in Cu–Zn and Au tailings. Samples were taken along a 50-cm deep profile at all sites and analyzed for SRB populations, solid-phase mineralogy and porewater geochemistry. Results indicated that the Cu–Zn tailings were highly oxidized near the surface, as shown by the very low pH, high redox potential, large concentrations of soluble Cu, Zn and sulfate in the porewaters, and the depletion of pyrite. On the other hand, Au tailings were more pH neutral, slightly anoxic, and showed low concentrations of Fe and SO4
2- in the porewaters and very little pyrite oxidation. SRB populations in the Cu–Zn tailings increased with depth, just below the oxic/anoxic interface and were linked to a decline of sulfate and DOC concentrations around the same depths. However, large concentrations of dissolved Fe were also observed around the same depth intervals. Our results suggest that SRB could be involved in sulfate reduction in the Cu–Zn tailings, because the solubility of sulfate was not controlled by the precipitation of sulfate-rich minerals. However, the presence of soluble Fe in the reduced portion of the tailings was also indicative of the presence of iron reducing bacteria (IRB). These bacteria were not enumerated in the present study, but their co-occurrence with SRB has been reported in the past in similar mining environments. The decline of sulfate and the release of soluble iron into the porewaters were also paralleled by a pH increase and the generation of alkalinity. In the Au tailings, SRB populations were generally constant throughout the depth profile and could not be ascribed to sulfate reduction in the porewaters. The solubilities of sulfate and iron in these tailings were partially controlled by jarosite and Fe-oxide minerals. It is then clear that SRB populations could be recovered from various mining sites, but their activity cannot be ascertained based on microbial enumeration and geochemical data. 相似文献
689.
690.
Rongbing FU Na MU Xiaopin GUO Zhen XU Dongsu BI 《Frontiers of Environmental Science & Engineering》2015,9(5):867
Nanoscale zerovalent iron (nZVI) synthesized using sepiolite as a supporter was used to investigate the removal kinetics and mechanisms of decabromodiphenyl ether (BDE-209). BDE-209 was rapidly removed by the prepared sepiolite-supported nZVI with a reaction rate that was 5 times greater than that of the conventionally prepared nZVI because of its high surface area and reactivity. The degradation of BDE-209 occurred in a stepwise debromination manner, which followed pseudo-first-order kinetics. The removal efficiency of BDE-209 increased with increasing dosage of sepiolite-supported nZVI particles and decreasing pH, and the efficiency decreased with increasing initial BDE-209 concentrations. The presence of tetrahydrofuran (THF) as a cosolvent at certain volume fractions in water influenced the degradation rate of sepiolite-supported nZVI. Debromination pathways of BDE-209 with sepiolite-supported nZVI were proposed based on the identified reaction intermediates, which ranged from nona- to mono-brominated diphenylethers (BDEs) under acidic conditions and nona- to penta-BDEs under alkaline conditions. Adsorption on sepiolite-supported nZVI particles also played a role in the removal of BDE-209. Our findings indicate that the particles have potential applications in removing environmental pollutants, such as halogenated organic contaminants. 相似文献