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Chen S.,Jinan University | Yin H.,South China University of Technology | Yin H.,Key Laboratory of Pollution Control | Ye J.,Jinan University | And 3 more authors.
Chemosphere | Year: 2013

Benzo[a]pyrene (BaP) biodegradation by Stenotrophomonas maltophilia was studied under the influence of co-existed Cu(II) ions. About 45% degradation was achieved within 3d when dealing with 1mgL-1 BaP under initial natural pH at 30°C; degradation reached 48% in 2d at 35°C. Efficacy of BaP biodegradation reached the highest point at pH 4. In the presence of 10mgL-1 Cu(II) ions, the BaP removal ratio was 45% on 7th day, and maintained stable from 7 to 14d at 30°C under natural pH. The favorable temperature and pH for BaP removal was 25°C and 6.0 respectively, when Cu(II) ions coexisted in the solutions. Experiments on cometabolism indicated that S. maltophilia performed best when sucrose was used as an additional carbon source. GC-MS analysis revealed that the five rings of BaP opened, producing compounds with one or two rings which were more bioavailable. © 2012 Elsevier Ltd.

Zhang J.Y.,South China University of Technology | Wu C.D.,South China University of Technology | Wu C.D.,Key Laboratory of Pollution Control | Zhang Z.L.,South China University of Technology
Asian Journal of Chemistry | Year: 2014

The adsorption behaviour of p-nitrophenol on variable charge soil was studied in simulated micropolluted surface water through batch adsorption experiments. It was observed that the adsorption of p-nitrophenol decreased with increasing the pH values of solution, whereas it increased with increasing of ionic strength content, temperature and adsorbent dose and the presence of heavy metal ions depressed the adsorption of p-nitrophenol. Langmuir and Freundlich models were used to describe the adsorption isotherms. Results indicated that Freundlich model was fit to experimental data well, revealing the possibility of more than just one monomolecular layer of coverage on the soil surface. The pseudo-first-order and pseudo-second-order kinetic model were applied to describe the kinetic data. The experimental data agreed with pseudo-second-order kinetic model well. Scanning electron microscope and Fourier transform infrared spectroscopy were used to characterize the soil before and after adsorption of p-nitrophenol.

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.

Hu W.C.,South China University of Technology | Hu W.C.,Key Laboratory of Pollution Control | Wu C.D.,South China University of Technology | Wu C.D.,Key Laboratory of Pollution Control | And 3 more authors.
Water Science and Technology: Water Supply | Year: 2015

The effects of raw diatomite on coagulation performance (CP) and the contents of residual aluminum (RAl) during the Pearl River water treatment with polyaluminum chloride (PAC) were investigated. Results demonstrated that the addition of raw diatomite could significantly improve the CP. The removal efficiencies (REs) of turbidity, dissolved organic carbon and UV254 could achieve 97.63%, 44.31% and 52.31%, respectively, at PAC dose of 20 mg/L and diatomite dose of 40 mg/L. Furthermore, adding appropriate dose of diatomite (less than 40 mg/L) could greatly reduce the RAl contents. The residual total aluminum and residual total dissolved aluminum both reached the lowest concentrations (0.185 mg/L and 0.06 mg/L, respectively) when the PAC dose was 15 mg/L and diatomite dose was 40 mg/L. © 2015 IWA Publishing.

Wu Y.,South China University of Technology | Wu Y.,Key Laboratory of Pollution Control | Luo H.,South China University of Technology | Luo H.,Key Laboratory of Pollution Control | And 5 more authors.
RSC Advances | Year: 2015

To improve the utilization efficiency of the Bi25FeO40 catalyst, Bi25FeO40-reduced graphene oxide (rGO) composite photo-catalysts were prepared by a facile hydrothermal method. The photocatalysts afforded fast degradation performance and high photocatalytic efficiency for degradation of phenol and p-chlorophenol under exposure to visible light irradiation. © The Royal Society of Chemistry 2015.

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