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Effects of ferric nitrate additions under different pH conditions on autothermal thermophilic aerobic digestion for sewage sludge

机译：不同pH条件下的硝酸铁添加对污水污泥自热嗜热性能消化的影响

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摘要

The effects of ferric nitrate additions at different pH values on stabilization of sewage sludge and microbial communities were investigated in autothermal thermophilic aerobic digestion (ATAD). The lowest pH value but highest VS removal was achieved at optimal pH of 6.5 when Fe(NO3)3 was added, compared to other dosing groups, and the stabilization time was shortened by 7 days. The increased dosing pH reduced the effectiveness of Fe(NO3)3 on disinhibition of excessive volatile fatty acids, and even caused failure of stabilization. However, highly basic dosing conditions (such as pH 9.5) could restore the ATAD ability by promoting the processes of hydrolysis and acidification, and then take back control of the pH. Illumina high-throughput sequencing revealed the group at optimal dosing pH significantly enhanced the abundance of phylum Firmicutes (from 61.0% to 96.6%), while the rise of dosing pH decreased the richness of phylum Firmicutes. The structure of the microbial community was totally changed under strong basic conditions of Fe(NO3)3 addition.
机译：在自热嗜热的有氧消化（ATAD）中研究了在污水污泥和微生物社区稳定下不同pH值的硝酸硝酸酯的影响。当加入到6.5的最佳pH下，与其他给药基团相比，在6.5的最佳pH下实现最低的pH值，但最高的VS去除，并将稳定时间缩短7天。增强的给药pH降低了Fe（No3）3对令人疏松过量的挥发性脂肪酸的有效性，甚至引起稳定失效。然而，高度基本的给药条件（例如pH9.5）可以通过促进水解和酸化的过程来恢复亚得特能力，然后恢复对pH的控制。 Illumina高通量测序显示，在最佳给药pH下揭示该组显着增强了门的丰度（从61.0％至96.6％），同时给药pH的兴起降低了门的丰富性。在Fe（NO3）的强大基本条件下，微生物群落的结构完全改变（NO3）。

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  • 来源
    《RSC Advances》 |2015年第109期|共8页
  • 作者

    Ningben Jin; Zongqi Shou; Haiping Yuan;

  • 作者单位

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China.;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China.;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China.;

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  • 正文语种 eng
  • 中图分类 化学;
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