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Ju F.,South China University of Technology | Ju F.,The Key Laboratory of Pollution Control | Hu Y.,South China University of Technology | Hu Y.,The Key Laboratory of Pollution Control | And 3 more authors.
Desalination | Year: 2011

Iron hydroxides prepared from microelectrolysis process were applied to remove EDTA-chelated copper from aqueous solution through adsorption-coprecipitation. To eliminate the occurrence of adverse reactions, Fe(II)-rich effluent of microelectrolysis was pretreated by continuously flushing N 2 for 15min to eliminate dissolved oxygen, then iron hydroxides were generated in less than 30s. The experimental results showed that Fe(II) yields could achieve 530.00-748.00mg/L after 60-min operation of microelectrolysis process at the initial pH of 2.0-2.3. The uptake rate of Cu(II) by iron(II) hydroxides was so rapid under nitrogen-aerated condition that 100% of Cu(II) was removed within only 5min at an initial Fe(II) concentration of 374.0mg/L. However, Cu(II) would desorb from iron hydroxides when iron(II) hydroxides were gradually oxidized into iron(III) hydroxides by oxygen, indicating that iron(II) hydroxide had much higher adsorptive capacity for chelated Cu(II) than iron(III) hydroxide. In addition, iron(II)/(III) hydroxides prepared from microelectrolysis process exhibited a higher removal efficiency of Cu(II) than iron hydroxides prepared from FeSO 4 7H 2O, especially under air-aerated condition. This research provided a novel method for efficient removal of both Cu(II) and EDTA from Cu(II)-chelated wastewater. © 2011 Elsevier B.V. Source

Zhao G.,South China University of Technology | Chen S.,South China University of Technology | Ren Y.,South China University of Technology | Ren Y.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | And 4 more authors.
International Biodeterioration and Biodegradation | Year: 2014

Environmentally hazardous and toxic chemicals are commonly generated in actual wastewater that the complex compositions in wastewater treatment system need different types of strains to be degraded. The main objective of this research was to understand the effect of extra substrates, phenolic and N-heterocyclic compounds, on the performance of pure cultural and mixed strains under single and dual substrates conditions. Two bacteria, Lysinibacillus sp. SC03 and Achromobacter sp. DN-06, were acclimated to degrade different concentrations of m-cresol and quinoline. The results indicated that Lysinibacillus sp. SC03 could completely degrade 100mgl-1 m-cresol with no delay time, however, little removal of quinoline was observed; Achromobacter sp. DN-06 could degrade 100mgl-1 quinoline in 32h, but could not remove m-cresol, which means m-cresol and quinoline is the specific substrate. The degradation rate of m-cresol fitted well to the zero-order kinetic equation although the degrading ability of Lysinibacillus sp. SC03 was inhibited when less than 100mgl-1 quinoline was added, and the inhibitive effect was confirmed to be a noncompetitive pattern which could be interpreted by the Michaelis-Menten kinetics equation with corresponding parameters Vmax, Km, K1 and K2 were 13.16mgl-1h-1, 35.84mgl-1, 200.0mgl-1 and 285.7mgl-1, respectively. Moreover, the addition of m-cresol-degrading strain (Lysinibacillus sp. SC03) could accelerate the removal of quinoline because the metabolites of quinoline could be degraded by Lysinibacillus sp. SC03 and the chemical equilibrium moved to more biodegradation of quinoline. Also, this process attributed to less the delay time during the quinoline removal. © 2013 Elsevier Ltd. Source

Li X.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,Key Laboratory of Pollution Control | Zhu N.,Eco Remediation of Guangdong Regular Higher Education Institutions | And 8 more authors.
Bioresource Technology | Year: 2013

Animal carcass wastewater (ACW) is a kind of typical high concentration organic wastewater. Up-flow tubular air cathode microbial fuel cells (MFCs) were constructed using 0, 4.0 and 8.0mg/cm2 MnO2 as cathodic catalyst, respectively (MFC-0, MFC-4 and MFC-8) to test the feasibility of bioelectricity production from ACW. After a start-up period of around 55d, when hydraulic retention time (HRT) was set at 3d, MFC-4 showed best bioelectricity performance with the maximum power density of 2.19W/m3 and minimum internal resistance of 30.3Ω, as compared to MFC-0 (1.14W/m3, 62.6Ω) and MFC-8 (1.49W/m3, 34.5Ω). Chemical oxygen demand (COD) and nitrate removal efficiencies of MFC-4 were 50.66% and 79.76%, respectively. Switching HRT from 3d to 6d, COD and nitrate removal efficiencies sped up while the increase rates of ammonia slowed down. The results demonstrated that ACW could be the fuel of MFCs to generate bioelectricity. © 2012 Elsevier Ltd. Source

Lan Y.,South China University of Technology | Lan Y.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Edu | Luo H.,South China University of Technology | Luo H.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Edu | And 6 more authors.
Microchimica Acta | Year: 2012

A glassy carbon electrode (GCE) was modified by casting gold-palladium (Au-Pd) nanoparticles onto its surface and then used for the determination of As(III) by stripping voltammetry. The structure and electrochemical properties of the nanoparticles were characterized by UV-vis spectroscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and cyclic voltammetry. Anodic stripping voltammetry of the modified electrode was performed in solutions of pH 4. 5 containing various concentrations of arsenite. The modified GCE exhibited good response towards As(III), with a limit of detection of around 0. 25 ppb which is much lower than the current EPA standard of 10 ppb. The electrode is stable and not interfered by Pb(II), Cd(II), Mn(II), and Zn(II). © 2012 Springer-Verlag. Source

Yao H.,South China University of Technology | Ren Y.,South China University of Technology | Ren Y.,Key Laboratory of Pollution Control | Ren Y.,Eco Remediation of Guangdong Regular Higher Education Institutions | And 4 more authors.
Journal of Hazardous Materials | Year: 2011

Phenols and N-heterocyclic compounds are found to co-exist in actual wastewater, especially in petrochemical and coking wastewater. Lysinibacillus cresolivorans, a bacterium capable of phenol-biodegradation was used to study the substrate interactions of m-cresol and pyridine as single and dual substrates. The cell growth and substrate biodegradation kinetics were also investigated with initial m-cresol concentrations varying from 0 to 1200mg/L and pyridine concentrations varying from 0 to 150mg/L. The single substrate kinetics was well described by the Haldane kinetic models. The single-substrate parameter values of m-cresol on cell growth were μ max=0.89h -1, K s= 426.25mg/L, K i=51.26mg/L and μ max=0.0925h -1, K s=60.28mg/L, K i=16.17mg/L for cell growth on pyridine. Inhibitory effects of substrates were observed when cells were grown on the mixed substrates. The interaction parameter I m,p (0.76) was greater than I m,p (0.11), which indicated that m-cresol inhibited the utilization of pyridine much more than pyridine inhibited the biodegradation of m-cresol. The study showed a good potential of L. cresolivorans in degrading mixed substrates of m-cresol and pyridine. © 2010 Elsevier B.V. Source

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