Zhang H.,Guangzhou University |
Zhang H.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta |
Zhang H.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Li M.,Guangzhou University |
And 7 more authors.
Ecological Engineering | Year: 2017
A novel non-traditional sulfate reducing bacterium (Sr 10) was isolated from an up-flow anaerobic sludge bed for acid mine drainage treatment which contains thallium (Tl) and sulfate. Phylogenetic analysis of partial 16S rRNA gene sequence of isolate Sr 10 revealed that it was identified to Citrobacter freundii species. Sr 10 was visually rod-shaped and very motile with peri-flagellum according to transmission microscopy. The Fourier transform infrared spectroscopy analysis indicated that the stains had various functional groups for Tl and sulfate removal, including hydroxyl, carboxyl, amide and phosphate. Under anaerobic conditions, the optimized growth conditions for the stain were obtained at temperature of 35 °C and initial pH value of 7.0. Sr 10 was able to remove both Tl(I) and SO42− simultaneously with the removal efficiency up to 99.60% and 89.80%, respectively. This strain might be used for Tl and sulfate removal in the process of bioremediation restoration. © 2017 Elsevier B.V.
Yi H.,Guangzhou University |
Luo D.-G.,Guangzhou University |
Luo D.-G.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Luo D.-G.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta |
And 6 more authors.
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016
The main basis for thallium emission standard of industrial wastewater includes factory production technology, wastewater treatment technology, and the characteristics of local water ecological environment. This article discusses the research method of industrial wastewater thallium emission standard by using the thallium wastewater treatment technology and the local ecological environment characteristics. As for thallium wastewater treatment technology, the most practical processing method is precipitation, while biological method is the most prospect method. The local water ecological environment characteristics mainly include the present situation of the water ecological environment, water quality management, the law of water quality change and other aspects. According to the characteristics, ecological environment present situation survey should include the dry season, normal season and wet season. Hydrological survey should focus on the changes in hydrology, sediment, and river channel; Water quality survey focus on conventional, characteristics and the bottom sediment parameters; The objective of water quality management, executes the local “Surface Water Environmental Function Zoning”. As the water environmental health concept study becomes more perfect, the water environment functional zoning will develop to the water ecological environment functional zoning. WASP7 is chosen as the model to study the water quality change laws and the parameter of the model can be confirmed by theoretical method, empirical method, experimental method, and model correction method. © 2016 Taylor & Francis Group, London.
Combination of dispersive liquid-liquid microextraction based on ionic liquid and pre-column fluorescence derivatization-high performance liquid chromatography for determination of eight sulfonamides in water samples
Wu C.,Guangzhou University |
Wu C.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Wu C.,Key Laboratory for Water Quality Security and Protection |
Lei J.,Guangzhou University |
And 8 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2014
Dispersive liquid-liquid microextraction based on ionic liquid coupled with high performance liquid chromatography (HPLC) and pre-column fluorescent derivatization method (IL-DLLME-HPLC-FL) was developed for the determination of eight sulfonamides (SAs). The influence of IL-DLLME parameters on extraction efficiency and the stability of derivatives of the eight SAs were investigated. The optimized experimental conditions were as follows; 40 (xL [C6MIM] [PF6] as extraction solvent, 0. 1 mL acetone as dispersion solvents; water sample with 0% NaCl (pH 4) was extracted by dispersive liquid-liquid microextraction without ultrasonic-assistance and then derivatized for 6 h. Under the optimized experimental conditions, the results indicated that the eight sulfanilamides showed good linearities when their mass concentrations were in 0. 2-10 |μg/L and 10-500 μg/L, and the linear correlation coefficients were no less than 0. 998 9. The detection limits ranged from 0. 08 μg/L to 0. 5 μg/L (S/N=3). The proposed method was applied to the analysis of four water samples from different sources (tap water, lake water, Pearl River water and pond water). The relative recoveries of the SAs spiked in water samples were 87. 2%- 101. 4% with the relative standard deviations of 3. 7%-6. 2% at three different concentration levels of 5, 50 and 200 μg/L. It is a convenient, environmental friendly method for the routine analysis of SAs in water samples.
Wu W.,Guangzhou University |
Yao G.,Guangzhou University |
Zhang X.,Guangzhou University |
Chen Z.,Guangzhou University |
And 3 more authors.
He Jishu/Nuclear Techniques | Year: 2015
Background: Agricultural wastes are widely applied in heavy metal wastewater treatment, and became a hot point in this field. Purpose: The aim is to study modified rice straw with significant removal ability of thorium. Methods: The rice straw modified with butanedioic acid was used to remove Th4+ from aqueous solution. And its influence factors such as adsorbent dosage, pH, adsorption time and reaction temperature were investigated through dynamic tests. Results: The optimal conditions were found to be 0.50 g of modified rice straw, pH=3.5, 0.5 h of adsorption time and 10 mg∙L-1 of initial thorium concentration at 65 ℃. Under these conditions, the removal rates reach 96%. Fourier transform infrared spectroscopy (FTIR) analysis shows some new adsorption peaks such as carboxyl, ester and hydroxyl has added to modified rice straw. The adsorption behavior of Th4+ could be fitted well by the Freundlich adsorption isotherms and the quasi-second order kinetics equation. Conclusion: Its absorptive property enhancement might attribute to expose more internal porous structure of lignin and cellulose and add special functional groups by the modifying process. ©, 2015, Science Press. All right reserved.
Long J.,Guangzhou University |
Luo D.,Guangzhou University |
Luo D.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Chen Y.,Guangzhou University |
Chen Y.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources
Chinese Journal of Applied and Environmental Biology | Year: 2014
This study aimed to obtain functional strains adsorbing thallium for application in industrial wastewater treatment. A thallium resistant bacterium BSA-68 strain was isolated from mining soil, preliminarily identified, and its Tl+ biosorption characteristics analyzed. The 16S rDNA sequence analysis revealed that the strain belonged to Pseudomonas sp. (accession number JF901709), therefore named as Pseudomonas sp. BSA-68. The strain possessed the capability of Tl+ resistance up to 30 mg/L in aqueous solution. The initial concentration of the solution, pH, adsorption time, speed and biomass all had certain degree of effect on Tl+ biosorption. The result showed that the optimum conditions for maximum biosorption were pH of 6.0 with biomass of 2.0 g/L, initial Tl+ concentration of 20 g/L, rotation 150 r/min and contact time of 30 min. Under such conditions, the adsorption rate could reach 93.77%. The Fourier transform infrared spectroscopy (FT-IR) analysis indicated that the main functional groups responsible for biosorption of thallium were hydroxyl, carboxyl and amino groups. The results presented in this study showed that the strain BSA-68 could be used as an effective, low cost biosorbent for the removal of thallium from waste water.
Xiong X.Y.,Guangzhou University |
Xiong X.Y.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Chen D.Y.,Guangzhou University |
Chen D.Y.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
And 4 more authors.
Resources, Environment and Engineering - 2nd Technical Congress on Resources, Environment and Engineering, CREE 2015 | Year: 2016
The adsorption behaviors of U (VI) ion on bamboo charcoal were investigated with various chemical methods. Parameters studied include the effects of pH, particle size, initial ion concentration, contact time and temperature by batch method. The results showed that bamboo charcoal could remove U (VI) ions effectively from aqueous solution. The loading of U (VI) ions was strongly dependent on pH and the optimal adsorption pH value is 3. In the batch system, the bamboo charcoal exhibited the highest U (VI) ion uptake rate as 98%, at an initial pH value of 3. The results revealed that bamboo charcoal was a good choice as a bio-sorbent for the recovery of uranium from aqueous solution. © 2016 Taylor & Francis Group, London.
Feng Y.-S.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Song G.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Zhu Q.-P.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Chen D.-Y.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources |
Chen Y.-H.,Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2013
In order to study the radionuclides vertical distribution of the sediments downstream from the uranium smelting in Guangdong, the contents of 238U, 235U, 226Ra, 232Th and 40K were measured in pond sediment, river sediments, and paddy soil profiles using HPGe-γ ray spectrometer. The 238U, 235U and 226Ra pollution were serious in the pond sediments > stream sediment > paddy soil, while those of 232Th and 40K changed a little. Radionuclides contents are relatively low in paddy soil, since the rice fields were not irrigated by water downstream from the uranium smelting. The contents of 238U, 235U and 226Ra were higher in the pond sediments than those of the paddy soil by about 100, 87, and 155 times, respectively. The contents of 238U, 235U, and 226Ra were increased with the vertical depth of sediment samples. The highest content was about 40 cm in depth. The 238U, 235U and 226Ra contents increased with stream sediment depth, and its contents positively correlated with organic matter content in the sediments.