Guangxi Hualan Design and Consulting Group Co.

Nanning, China

Guangxi Hualan Design and Consulting Group Co.

Nanning, China
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Pu Z.,University of Washington | Ji K.,Jiangsu Institute of Urban Planning and Design | Li Z.,Nanjing Southeast University | Wan Q.,Guangxi Hualan Design and Consulting Group Co.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2017

Downtown San Francisco parking data from 2011 to 2014 were analyzed and the spatial heterogeneity of the effect of the price change on the roadside parking occupancy was studied. The dynamic parking charge policy was implemented for the roadside parking space in this area. According to the parking occupancy, the price was determined. When the block parking occupancy was above, below or at the desired level, the parking price dynamically increased, decreased or remained the same. The geographically weighted regression model method was used to capture the spatial heterogeneity of the effects of the price change in different blocks on the parking occupancy. The implementation steps of dynamic parking pricing policy were put forward. The results show that the sensitivity of the price change for roadside parking demand has obvious spatial heterogeneity. The time slots, neighborhood characteristics, social demographics and other variables also have significant impact on the change of the parking occupancy. The results can be used for strategy development of the roadside dynamic parking pricing policy, promoting the gain of the desired parking occupancy. © 2017, Editorial Department of Journal of Southeast University. All right reserved.


Liu Y.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Peng Z.,Guangxi University | And 6 more authors.
Chinese Journal of Environmental Engineering | Year: 2016

In this work, we demonstrated the combination of novel simulated solar light with a three-dimensional electro-Fenton system (3D/SPEF) for the degradation of methyl orange (MO) with TiO2 nanotubes, graphite, and foam nickel as the anode, cathode, and particle electrodes, respectively. The reaction conditions, degradation kinetics, and synergistic effect of the systems in the treatment of MO were studied. The experimental results demonstrated that simulated solar light combined with a three-dimensional electro-Fenton system had a significant synergistic effect. The energy consumption of 3D/SPEF was only 9/16 of that of the 3D/EF system. The overall reaction order of the synergistic system was 0.97. The optimal reaction conditions determined by single factor experiments were as follows: the voltage was 20 V, initial solution pH was 7, MO concentration was 50 mg/L, and Fe2+ dosage was 1 mmol/L, giving a removal efficiency of 93.77%. The neutral solutions in the 3D/EF system were favorable for the degradation of MO, which overcomes the shortcomings of most three-dimensional electro-Fenton systems that could only achieve high efficiency under acidic conditions. © 2016, Science Press. All right reserved.


Chen Y.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Sun L.,Guangxi University | And 3 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

According to landfill leachate's characteristics of high concentration of pollutants, poor biochemical degradability, etc, semi-aerobic aged refuse bioreactor and ultrasound/Fenton process were applied to treat landfill leachate. The removal rates of chemical oxygen demand(COD), ammonia nitrogen(NH3-N), total phosphorus(TP) and colorimetry treated by semi-aerobic aged refuse bioreactor were 80%, 85%, 92%, 85%, respectively. The optimal technical conditions of ultrasound/Fenton process were discovered by single factor and orthogonal experiments. Satisfying treatment effect of the total removal rate of landfill leachate by combined semi-aerobic aged refuse bioreactor and ultrasound/Fenton process could be achieved. The highest removal rates of COD, NH3-N, TP and colorimetry were 96%, 86%, 94% and 95%, respectively. The final effluent was inodorous with color of pale yellow. Its BOD5/CODi increased from 0.16 to 0.35, which met follow-up biological treatment. The effluent of COD, TP could meet the Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008).


Chen Y.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Wang Y.,Guangxi University | And 6 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

The application of titanium dioxide-loaded granular activated carbon (TiO2-GAC) in a dielectric barrier discharge (DBD) reactor for degradation of methyl orange (MO) was investigated. Several factors, such as peak voltage, pH, solution conductivity, MO concentration and TiO2-GAC content, and the effect of TiO2-GAC in the combined treatment of DBD and TiO2-GAC were considered to explore the applicability, and a reaction kinetics model was established. Experimental results indicated that a synergistic effect appeared in the combined treatment, where degradation efficiency and chemical oxygen demand (COD) removal rate were 96.2% and 90% after a 25 minutes reaction. Compared to DBD, the degradation efficiency and COD removal rate increased 53.7% and 50.4% in DBD combined with TiO2-GAC. The empirical kinetic equation of MO degradation fit well with the experimental data, with an overall reaction order of 2.352. The experimental data showed that with the addition of TiO2-GAC, concentration of H2O2 increased while O3 decreased in DBD reactor, which suggested that TiO2-GAC catalyst induced a well catalytic effect in the combined treatment. The regeneration efficiency of TiO2-GAC was about 80% after five times DBD regeneration cycles, which confirmed the reuse feasibility of the regenerated GAC. ©, 2015, Science Press. All right reserved.


Xiang G.-L.,Guangxi University | Yu Z.-B.,Guangxi University | Yu Z.-B.,Guangxi Hualan Design and Consulting Group Co. | Chen Y.,Guangxi University | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

Seeking an efficient treatment method for bisphenol A (BPA), a representative endocrine disrupting compound, is important for environmental remediation and human health. Herein, the degradation of BPA by means of photoelectrocatalysis was investigated. Fe doped-TiO2 nanotube arrays (Fe/TNA) served as the photoanode, and a xenon lamp simulated the solar light source. First, undoped TiO2 nanotube arrays (TNA) and a series of Fe/TNA were characterized by field emission scanning electron microscopy, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. The UV-Vis absorption spectra of Fe/TNA showed a red-shift and an enhancement of the absorption in the visible-light region compared to TNA. Then, experimental conditions including Fe doping content, current intensity and aeration rate were varied to demonstrate their effects on the elimination of BPA. It was observed that the degradation of BPA could be fitted to the quasi-first-order equation. Under the following conditions: Fe/TNA prepared by 0.9 mol·L-1 Fe(NO3)3 solution dip-coating as photoanode, titanium foil as cathode, current intensity of 1.15 mA·cm-2 and initial BPA concentration of 10 mg·L-1, 72.3% BPA was decomposed during 4 h reaction, with a rate constant of 5.32×10-3 min-1. Aeration enhanced the removal rate of BPA to 82.7% and 94.1% with an aerating rate of 1.0 L·min-1 using titanium foil as cathode and an aerating rate of 0.2 L·min-1 using carbon cloth as cathode, respectively, and the corresponding rate constants were 7.20×10-3 min-1 and 11.6×10-3 min-1, respectively. ©, 2015, Science Press. All right reserved.


Liu Q.,Guangxi University | Yu Z.-B.,Guangxi University | Yu Z.-B.,Guangxi Hualan Design and Consulting Group Co. | Zhang R.-H.,Guangxi University | And 6 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

Perfluorooctanoic acid (PFOA) is a new persistent organic pollutant which has got global concern for its wide distribution, high bioaccumulation and strong biological toxicity. In present study, the photocatalytic degradation of PFOA using palladium doped TiO2(Pd-TiO2) prepared by chemical reduction method was investigated. The photocatalysts were characterized by XRD, FESEM and UV-vis DRS and were used for PFOA degradation under 365 nm UV irradiation. The results indicated that the grain size of TiO2 was smaller while the specific surface area increased and the absorption of ultraviolet light also enhanced after using chemical reduction method, but all these changes had no influence on PFOA degradation. However, the degradation was significantly enhanced because of the deposition of Pd, the fluoride concentration of PFOA was 6.62 mg·L-1 after 7 h irradiation which was 7.3 times higher than that of TiO2(P25). Experiments with the addition of trapping agent and nitrogen indicated that ·OH played an important role in PFOA degradation while the presence of O2 accelerated the degradation. The main intermediate products of photocatalytic degradation of PFOA were authenticated by an ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry systems (UPLC-QTOF-MS). The probable photocatalytic degradation mechanism involves h+ attacking the carboxyl of PFOA and resulting in decarboxylation. The produced ·CnF2n+1 was oxidized by ·OH underwent defluorinetion to form shorter-chain perfluorinated carboxylic acids. The significant enhancement of PFOA degradation can be ascribed to the palladium deposits, acting as electron traps on the Pd-TiO2 surface, which facilitated the transfer of photogenerated electrons and retarded the accumulation of electrons. ©, 2015, Science Press. All right reserved.


Peng Z.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Sun L.,Guangxi University | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In this study, the treatment of rhodamine B simulated wastewater using photoelectro-Fenton system under visible light was investigated. The effects of the electrolyte, anodizing time, annealing temperature and annealing time on preparation of the anode material-TiO2 thin film electrode were explored. Then, the photoelectric effect and synergy of the application of such anodes materials in photoelectro-Fenton system under visible light in degradation of rhodamine B were analyzed. Based on the parameters ranges of the single factor experiments, preparation conditions were obtained using the response surface optimization methodology to anode material: electrolyte of 0.5%NH4F glycerol solution, anodic oxidation time of 93.26 min, annealing temperature of 602.89℃ and annealing time of 127.49 min. The simulated removal rate to rhodamine B under the conditions of application of the anode material of the photoelectro-Fenton system was 70.78%, and synergistic factor showed in photocatalysis and electro-Fenton in this condition was 1.92, which means that the photoelectric synergistic effect is remarkable. The sequence of key factors of preparation TiO2 thin film electrode influencing the photoelectron-Fenton removal efficiency are anodic oxidation time, annealing time, annealing temperature, respectively. Three experimental surface model validation errors were less than 5%, which indicats that the model is valid.


Xiang G.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Chen Y.,Guangxi University | Yang O.,Guangxi University
Chinese Journal of Environmental Engineering | Year: 2014

Sugarcane bagasse was added into sludge to prepare compositional activated carbons(CACs), and Plackett-Burman combining with response suraface methodology was employed to sieve and optimize the conditions affecting the iodine adsorption value of CACs. The Plackett-Burman results show that pyrolysis temperature, pyrolysis time and dried weight ratio of sugarcane bagasse to sludge are the main influencing factors. Using these three factors as variables, a second order model of the iodine adsorption value of CACs was obtained by Box-Behnken design and response surface methodology analysis. The model shows that the interactions of pyrolysis temperature and pyrolysis time, pyrolysis temperature and dried weight ratio are significant, and determines that the optimal pyrolysis temperature is 550℃, pyrolysis time is 30 min and dried weight ratio is 50%. The iodine adsorption value of CAC prepared under this condition is 814 mg/g, being higher than other CACs'. The effects of sugarcane bagasse addition on the physicochemical properties of CACs were investigated by analyzing surface area, pore structure, iodine adsorption value and carbon content, which indicate that the addition of sugarcane bagasse increases the surface area, micro-pore volume, iodine adsorption value and carbon content. The results indicate that addition of sugarcane bagasse and optimization of preparation conditions are effective methods to improve the adsorption properties of sludge based activated carbon. ©, 2014, Science Press. All right reserved.


Peng Z.,Guangxi University | Yu Z.,Guangxi University | Yu Z.,Guangxi Hualan Design and Consulting Group Co. | Wang L.,Guangxi University | And 5 more authors.
Journal of Advanced Oxidation Technologies | Year: 2016

In this study, TiO2 nanotube (TNTs) electrodes were synthesized via direct anodic oxidation and TiO2 nanotubes modified with Fe2O3 (Fe2O3/TNTs) electrodes were obtained by electrochemical deposition method. The decolorization of Rhodamine B wastewater by solar photocatalytic/photoelectro-Fenton coupling system was investigated, where Fe2O3/TNTs electrodes and activated carbon fibre (ACF) were used as anode and cathode, respectively. The results indicated that uniform TiO2 nanotube was obtained and the diameter ranged from 40 to 50 nm. UV-Vis DRS results revealed that the modified Fe2O3/TNTs electrodes showed a stronger response in the visible region compared with TNTs electrodes. Parameters had a big influence on solar photocatalytic/ photoelectro-Fenton decolorization of Rhodamine B, the decolorization of Rhodamine B reached 96.6% within 60 min at the optimum conditions. The pseudo-first-order was used to fit the dynamic data with a rate constant of 0.05472 ± 0.00134 min-1. Hydroxyl radical and photo generated hole were the main active species contributed to Rhodamine B decolorization, making a contribution of 76.6% and 16.6%, respectively. © 2016 Science & Technology Network, Inc.


Li M.-J.,Guangxi University | Yu Z.-B.,Guangxi University | Yu Z.-B.,Guangxi Hualan Design and Consulting Group Co. | Chen Y.,Guangxi University | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

Decomposition of perfluorooctanoic acid (PFOA) is of prime importance since it is recognized as a persistent organic pollutant and is widespread in the environment. Heterogeneous photocatalytic decomposition of PFOA by TiO2(P25) was investigated under 254 nm UV light. Experimental conditions including initial pH, TiO2 content and PFOA concentration, were varied to demonstrate their effects on the decomposition of PFOA. It was observed that the photocatalytic degradation kinetics of PFOA could be fitted to the quasi-first-order equation. The pH played a determinant role in the decomposition of PFOA and the presence of O2 increased the degradation rate. Optimal conditions for a complete removal were obtained using 1.5 g·L-1 TiO2 at pH 3 in air atmosphere, with a rate constant of 0.420 6 h-1. The contribution experiments of various reactive species produced during the photocatalysis were also investigated with the addition of different scavengers and it was found that photogenerated holes (h+) was the major reactive species which was responsible for 66.1% of the degradation rate, and the ·OH was involved in PFOA degradation as well. In addition, the photocatalytic experiment with the addition of NaF indicated that the adsorption of PFOA was of primary importance for the photocatalytic decomposition. Perfluorocarboxylic acids (PFCAs) with shorter carbon chain length as intermediates and products were identified with UPLC-QTOF/MS, and a possible mechanism for PFOA decomposition was proposed.

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