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Anaerobic Fermentation

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Qi Zhou – 1st expert on this subject based on the ideXlab platform

  • effect of nonylphenol on volatile fatty acids accumulation during Anaerobic Fermentation of waste activated sludge
    Water Research, 2016
    Co-Authors: Xu Duan, Xiao Wang, Leiyu Feng, Qi Zhou

    Abstract:

    Most of the reported studies on Anaerobic Fermentation of sludge focused on the influences of operating conditions, pretreatment methods, and its characteristics, and little attention was paid to those of persistent organic pollutants (POPs) which widespreadly appeared in sludge. In this study, the effect of nonylphenol, a typical POPs in waste activated sludge (WAS), on Anaerobic Fermentation for volatile fatty acids (VFAs) accumulation was investigated. The concentration of VFAs during WAS Anaerobic Fermentation was found to be affected positively from 2856 mg COD/L in the control (without NP) to 5620 mg COD/L with NP of 200 mg/kg dry sludge. Mechanism exploration exhibited that the main reason for the enhanced VFAs accumulation in the presence of NP was that more acetic acid was generated during the acidification of WAS, which was increased by almost three times (3790 versus 1310 mg COD/L). In WAS Fermentation systems, the abundance of Anaerobic functional microorganisms was advantageous to the accumulation of acetic acid. Further investigation by the pure acetogen revealed that both the viability and activity of Proteiniphilum acetatigenes were improved by NP during Anaerobic Fermentation, resulting in more production of acetic acid and showing good agreement with that in the real WAS Fermentation systems.

Hyon Hee Yoon – 2nd expert on this subject based on the ideXlab platform

  • volatile fatty acids production from marine macroalgae by Anaerobic Fermentation
    Bioresource Technology, 2012
    Co-Authors: Thi Nhan Pham, Young Joong Jeon, Hyon Hee Yoon

    Abstract:

    Abstract Volatile fatty acids (VFAs) were produced from the marine macroalgae, Laminaria japonica , Pachymeniopsis elliptica , and Enteromorpha crinite by Anaerobic Fermentation using a microbial community derived from a municipal wastewater treatment plant. Methanogen inhibitor (iodoform), pH control, substrate concentration, and alkaline and thermal pretreatments affected VFA productivity. Acetic, propionic, and butyric acids were the main products. A maximum VFA concentration of 15.2 g/L was obtained from 50 g/L of L. japonica in three days at 35 °C and pH 6.5–7.0. Pretreatment with 0.5 N NaOH improved VFA productivity by 56% compared to control. The result shows the applicability of marine macroalgae as biomass feedstock for the production of VFAs which can be converted to mixed alcohol fuels.

Zhang Dalei – 3rd expert on this subject based on the ideXlab platform

  • Study on the status of two-phase Anaerobic Fermentation for crop straws.
    Renewable Energy Resources, 2020
    Co-Authors: Bian Yongcun, Li Shimi, Zhang Dalei

    Abstract:

    The technology of two-phase Anaerobic Fermentation has a series of characteristics and advantages,because of the separation of acidogenic phase and methanogenic phase,is gradually gotten people’s attention. Consider the crop straw characteristic of difficult to be degraded,the paper mainly introduce about the two-phase Anaerobic Fermentation process in the straws pretreatment technology,and introduce the control process parameters of hydrolysis and acidogenesis,meanwhile,introduce several reactors of two-phase Anaerobic Fermentation,finally,briefly discuss the further research process of two-phase Anaerobic Fermentation of crop straws.

  • Study on expanding technology for dry Anaerobic Fermentation of corn stalks
    Renewable Energy Resources, 2020
    Co-Authors: Zhang Dalei

    Abstract:

    The study on the changes in composition and structure of corn stalk after puffing process was carried out,and the experimental study on the dry Anaerobic Fermentation of the expanded corn stalk was followed.The result shows,for the corn stalk treated by expanding,there is a signifi-cant increase for the amount of reducing sugar,the crystallinity of cellulose has been brought down to 12.68%,the internal structure of straw also has been changed.For the dry Anaerobic Fermentation process,the reaction is started fast,the rate of gas production and methane content have been increased over that of non-expanded corn stalk,the maximum rate of gas production was 0.916 m3/(m3.d),the methane content was up to 80.2%.