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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.


Luo D.,Guangzhou University | Luo D.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | Zhang H.,Guangzhou University | Zhang H.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | And 5 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

In this study, Watershed Analysis Risk Management Framework (WARMF) model was applied for hydrologiy and sediment simulation and analysis of non-point loads of SS into rivers at catchment level in the Hangbu-Fengle River Watershed of Chao Lake. The study area was divided into 37 catchments by using AVSWAT2000 model, and based on analysis of the relation between topography and soil type within the study area, the 37 catchments were classified into four groups, including plain, hummock, hill and mountain. Observed hydrologic data and suspended sediment data in 2000-2003 were used for model calibration and validation. Study on calibration and validation of hydrology and sediment parameters indicated that WARMF model was applicable for hydrology and sediment simulation in Fengbu-Hangle River watershed. Analysis of non-point loads of SS into rivers at catchment level showed that the catchments were divided into five classes (Class A, B, C, D and E) according to the nonpoint SS loads at each catchment. The Class A and Class B catchments, which accounted for 82.01% of the total non-point sources loads, can be considered as the key SS control zones, the total area of which was 34.78% of the subject watershed, and the zone were distributed mainly in the middle-low mountain area of the Hangbu River branchs. © 2011 IEEE.


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.


Zhang Q.-H.,Guangzhou University | Zhang Q.-H.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | Luo D.-G.,Guangzhou University | Luo D.-G.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | And 4 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

The study selected COD from the Likeng landfill leachate in Guangzhou as the characteristic contaminant. The relevant parameters of the model were obtained by static adsorption, degradation and dispersion experiments in the laboratory, which impact pollutants transport. And the migration characteristics of COD in vadose zone was made by numerical solution method. The results showed that: (1)The degradation of landfill leachate coefficient is 0.4244 / a ; (2)The most long-distances that landfill leachate polluts the groundwater in the vadose zone ,is 37m. © 2011 IEEE.


Zhang H.-G.,Guangzhou University | Zhang H.-G.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | Luo D.-G.,Guangzhou University | Luo D.-G.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | And 6 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Human health has been great threatened by acid wastewater containing thallium. The feasibility of start-up Sulfate-Reducing Bioreactor with acid wastewater containing thallium had been studied in the experiment. Sulfate-Reducing Bioreactor being started up successfully within 136 days with the method of high rate cultivation had been demonstrated. The results showed that the average removal efficiencies of sulfate achieved 25.21%, 61.08% and 93.39% during the lag phase, the increase phase and the steady phase of the Sulfate-Reducing Bioreactor, respectively. A preferable removal efficiency of thallium had been achieved, corresponding to the average thallium removal efficiency of 97.97% during the experimental period. However, COD in the acid wastewater mixture need further treatment due to removal efficiency of COD was not well, corresponding to the average removal efficiency of 26.12% in the steady phase of Sulfate-Reducing Bioreactor. The ratio of removal COD to sulfate reduced gradually and tented to be steady with the advance of start-up process of the bioreactor, which had been demonstrated that positive relevance was existed between the ratio of removal COD to sulfate and sulfate removal efficiency of the bioreactor. © 2011 IEEE.


Cao H.-H.,Guangzhou University | Cao H.-H.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | Zhang H.-G.,Guangzhou University | Zhang H.-G.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | And 4 more authors.
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

A study on effects of the COD/sulfate ratio on characteristics of sulfate-reduction bacteria (SRB) in activated sludge of a UASB reactor was performed in batch anaerobic digestion experiment. Changes of pH in samples were 7.22∼8.17 which was beneficial to the growth of SRB with high sulfate removal efficiency. Sulfate reduction efficiencies of COD/sulfate ratios from 0.43 to 3.03 were 18.7(R1), 38.3(R2), 69.7(R3), 86.6(R4), 94.3(R5), 93.2(R6), 92.3(R7) %. Alone with COD/sulfate ratio increased, sulfate reduction efficiency also increased for R1∼R5. However, the result was the opposite for R5∼R7. It had been demonstrated that the activity of SRB at the COD/sulfate ratio of 2.17 was the best. Total sulfide produced by sulfate reached the maximum of 100 mg/L at the COD/sulfate ratio of 2.17. Sulfate reduction inhibition could not be caused by the total sulfide. © 2011 IEEE.


Liu Z.,Guangzhou University | Liu Z.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | Dai Q.,Guangzhou University | Dai Q.,Key Laboratory for Water Quality Security and Protection in Pearl River Delta | And 3 more authors.
Advanced Materials Research | Year: 2012

Antimony doped tin oxide (ATO) nanoparticles were synthesized via complex-homogeneous coprecipitation. Then different drying methods (such as azeotropic distillation, infrared drying and microwave drying, etc.) were used to eliminate the agglomeration. The nanoparticles were characterized by thermal analysis, X-ray diffraction (XRD), and Brunauer-Emmett-Teller measurements (BET). The result shows that ATO nanopaticles with tetragonal rutile phase structure are all well crystallized after the drying processes above, and the average grain size is between 29.30 nm and 71.52 nm. The grain size estimated by BET method is similar to the result of Scherrer equation, and the nanoparticles prepared by azeotropic distillation have better crystallinity comparing to other methods. With the extension of the distillation time, the grain size increases, and the colour changes from grey blue to light grey. Moreover, the combination of azeotropic distillation and infrared drying can prepare smaller and better crystalline ATO nanoparticles.

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