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Enhancement of volatile fatty acid production using semi-continuous anaerobic food waste fermentation without pH control

机译：使用半连续厌氧食物废物发酵产生挥发性脂肪酸产生的增强无需pH控制

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摘要

This study proposed a cost-effective and high-yield volatile fatty acid (VFA) production strategy using anaerobic food waste (FW) fermentation without pH control, which could be recommended for practical scale VFA production and FW treatment. Efficient hydrolysis, high VFA production (867.42 mg COD per g of VS) and VFA/SCOD (88.65%), and slight methane production (20.56 mL per g of VS, only 5.34% of theoretical value) were obtained via semi-continuous anaerobic FW fermentation under the optimized conditions, which were a substrate to inoculum ratio of 5, a temperature of 40 degrees C, a solid retention time of 7 d and an organic loading rate of 9 g VS per L per d. The highly-efficient VFA production was mainly attributed to the proper pH, which was not adjusted artificially and was maintained at 5.2-6.4 by the neutralization effect of ammonia release. And both the kinetic model and the carbon mass balance analysis showed that the substrate was adequately utilized to produce VFA under the optimized conditions. These results were of great guiding significance for the practical continuous recovery of VFA from FW.
机译：本研究提出了一种经济高效，高产挥发性脂肪酸（VFA）生产策略，使用无pH控制，可以推荐用于实际规模VFA生产和FW治疗。高效水解，高VFA生产（每G的867.42mg COD）和VFA / SCOD（88.65％）和轻微的甲烷产量（每G的20.56ml，只有5.34％的理论值）是半连续的厌氧FW发酵在优化条件下，其是底物的底物为5，温度为40℃，固体保留时间为7d，每D每D的9g Vs的有机加载速率为9g Vs。高效的VFA生产主要归因于适当的pH值，该pH未人工不调整，并通过氨释放的中和作用维持在5.2-6.4。动力学模型和碳质量平衡分析表明，在优化条件下，底物被充分利用以在优化条件下生产VFA。这些结果对VFA的实际连续恢复具有很大的指导意义。

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  • 来源
    《RSC Advances》 |2015年第126期|共8页
  • 作者

    Wu Qinglian; Guo Wanqian; Yang Shanshan; Luo Haichao; Peng Simai; Ren Nanqi;

  • 作者单位

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

    Harbin Inst Technol State Key Lab Urban Water Resource &

    Environm Harbin 150090 Heilongjiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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