Zhigang Ge

Jiaxing University, Kashing, Zhejiang Sheng, China

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Publications (5)9.13 Total impact

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    ABSTRACT: BACKGROUND We cultured five microalgal strains characterized by high biogas tolerance and rapid growth in biogas slurry to identify strains capable of simultaneous nutrient removal and biogas upgrading. The potential contribution of these algae to these processes was evaluated at different photoperiods.RESULTSThe growth rates of the microalgae were inversely analogous to their initial concentrations. The growth rates of Scenedesmus obliquus (FACHB-31), Chlorella vulgaris (FACHB-416), and Nitzschia palea (FACHB-211) were higher than those of Selenastrum capricornutum (FACHB-271) and Anabaena spiroides (FACHB-498) under a moderate photoperiod (14 h light: 10 h dark). Under this condition and an initial CH4 concentration of 61.38% (v/v), the final concentrations in crude biogas were 84.28%, 84.21%, and 83.46% for S. obliquus, C. vulgaris, and N. palea, respectively. Biogas slurry nutrients were optimally reduced under the moderate photoperiod.CONCLUSION Appropriate selection of microalgal strains for the treatment of biogas slurry and crude biogas is crucial to achieve optimal nutrient removal and biogas upgrading.
    Journal of Chemical Technology & Biotechnology 07/2015; DOI:10.1002/jctb.4788 · 2.35 Impact Factor
  • Yongjun Zhao · Zhigang Ge · Hui Zhang · Jiqing Bao · Shiqing Sun
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    ABSTRACT: BACKGROUND This study aims to simultaneously reduce biogas slurry nutrient and upgrade biogas via microalgal production. Marine microalgae were grown in a culture medium containing a mixture of seawater and biogas slurry with CO2 from synthetic biogas. The effects of different ratios of biogas slurry and various influent concentrations of CH4 in synthetic biogas on the growth of Nannochloropsis sp. were examined. Nutrient removal and biogas upgrading were also studied under different influent CH4 concentrations.RESULTSNannochloropsis sp. showed optimal growth in 40% biogas slurry and significantly enhanced growth in synthetic biogas with 50% CO2. The optimal range of influent CH4 concentration for the removal of biogas slurry nutrients was 45% to 50%. Notably, the influent CH4 concentration of 60% (v/v) provided an optimal CO2 concentration for Nannochloropsis sp. cultivation. Advantageous CO2 removal and biogas upgrading were observed under this condition. This treatment increased CH4 concentration in synthetic biogas from 60% to 93.58% after 6 d of cultivation.CONCLUSION Appropriate control of the biogas slurry or seawater and CH4 concentrations in the influent is crucial to simultaneously optimize nutrient removal and biogas upgrading.
    Journal of Chemical Technology & Biotechnology 03/2015; DOI:10.1002/jctb.4694 · 2.35 Impact Factor
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    ABSTRACT: This research focused on the nutrient removal and the simultaneous CO2, CH4, and N2O emission rates of various combinations of vertical subsurface flow constructed wetlands (VSFCWs) and earthworm eco-filters (EEs) under different influent C/N ratios in synthetic wastewater. The optimal parameters for nutrient removal were influent C/N ratios of 5 : 1 and 10 : 1 as well as the combination VSFCW-EE. Relatively low values of greenhouse gas (GHG) emission rates measured in situ were obtained at a C/N ratio of 5 : 1. The emission rates of CH4 and N2O were considerably lower than that of CO2. The VSFCW-EE and EE-VSFCW combinations showed similar GHG emission results. The C/N ratio of 5 : 1 and the VSFCW-EE combination exhibited the highest nutrient removal efficiency with the lowest GHG emission rate. Wastewater nutrient removal and GHG emission were both high during summer (June to August) and low during winter (December to February).
    Environmental Sciences: Processes and Impacts 02/2014; 16(3). DOI:10.1039/c3em00655g · 2.17 Impact Factor
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    Zhigang Ge · Hui Zhang · Yuejin Zhang · Cheng Yan · Yongjun Zhao
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    ABSTRACT: The high-strength wastewater is now well known as a threat to the natural water since it is highly possible to arouse water eutrophication or algal blooms. The effects of various light emitting diode wavelengths and intensities on the microalgae biological wastewater treatment system was studied in this research. The various nutrient removals and economic efficiencies represented similar variation trends, and these variations under both high C and N loading treatments were similar too. The order for microalgae C. vulgaris reproduction in terms of dry weight and nutrient removal efficiency both were red > white > yellow > blue, under high carbon and nitrogen loading treatments, indicating that the red light was the optimum light wavelength. Furthermore, considering the optimal light intensity in terms of nutrient removal efficiency was 2500 and 2000 μmol/m2•s, while in terms of economic efficiency was 1000, 1500 and 2000 μmol/m2•s. Therefore, the optimum light intensity was found to be 2000 μmol/m2•s. In addition, the optimal experimental illumination time was determined as 120 h. The Chlorella vulgaris microalgae biological wastewater treatment system utilized in this research was able to purify the high-strength carbon and nitrogen wastewater effectively under optimum light wavelength and intensity.
    Journal of Environmental Health Science and Engineering 06/2013; 11(1). DOI:10.1186/2052-336X-11-8 · 0.50 Impact Factor
  • Yuejin Zhang · Juan Wang · Zhigang Ge · Guanlin Guo · Shumei Gao
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    ABSTRACT: Polycyclic aromatic hydrocarbon (PAH) and nitrated PAH (NPAH) products are toxic. Thus, determination of their concentrations is of great interest to researchers of soil and water pollution control. In this work, soil samples, surface water samples, and groundwater samples were collected, and the concentrations of 16 priority PAHs and 15 NPAHs were determined using an HPLC-ultraviolet detector. Results showed that the total PAH concentrations ranged within 489.69–1,670.11 ng/g (average = 905.89 ng/g) in soil samples, 4.00–23.4 μg/l (average = 9.84 μg/l) in surface water samples, and 2.14–22.3 μg/l (average = 8.37 μg/l) in groundwater samples. The NPAH concentrations were one to two orders of magnitude lower than the PAH concentrations and ranged within 22.72–128.70 ng/g (average = 63.88 ng/g) in soil samples. 2-Nitropyrene and 6-nitrochrysene were the most abundant compounds, accounting for about 14.3 and 26.5 %, respectively. Source analysis revealed that most PAHs originated from coal combustion around the study area, whereas NPAH studies suggested that the primary emission of gasoline engines and daytime OH reactions were the dominant sources of these compounds.
    Environmental Earth Sciences 02/2013; 71(3). DOI:10.1007/s12665-013-2513-x · 1.77 Impact Factor