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Comparison of enhancement of anaerobic digestion of waste activated sludge through adding nano-zero valent iron and zero valent iron

机译：通过添加纳米零价铁和零价铁，对废物活性污泥增强的比较

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摘要

The feasibility of adding nano-zero valent iron (NZVI: 0.6, 1.0, 4.0, 10.0 g L-1) to enhance anaerobic digestion of waste activated sludge (WAS) was examined by comparison with ZVI, and the mechanisms of NZVI enhancement of the hydrolysis and methanogenesis processes were elucidated. NZVI could enhance hydrolysis-acidification of WAS by destroying the integrity of microbial cells. Both volatile fatty acids production and the acetic acid portion were greatly improved by NZVI additions, peaking at 4.0 g NZVI. In anaerobic digestion, CH4 production was promoted at a NZVI dosage = 1.0 g L-1. The optimum dosage of NZVI for methanogenesis was 1.0 g L-1, and further addition of NZVI could cause inhibition of methanogenesis because of long-term accumulation of H-2. ZVI could also improve hydrolysis-acidification and the CH4 yield, but its efficiency was relatively low compared with NZVI, and it could not induce cell wall rupture. 16S rDNA high-throughput sequencing results showed that NZVI addition at appropriate dosage facilitated increasing the proportion of microorganisms involved in WAS hydrolysis-acidification and methanogenesis.
机译：通过与ZVI的比较，研究了添加纳米零铁（NZVI：0.6,1.0,4.0,10.0,10.0,10.0,1.0,10.0g L-1）的可行性，以及NZVI增强的机制阐明了水解和甲烷化方法。 NZVI可以通过破坏微生物细胞的完整性来增强水解酸化。通过NZVI添加，达到挥发性脂肪酸产生和乙酸部分，在4.0g NZVI下达到峰值。在厌氧消化中，在NZVI剂量中促进CH 4制备＆ = 1.0g L-1。对于甲烷发生的NZVI的最佳剂量为1.0g L-1，并且由于H-2的长期积累，进一步添加NZVI可能导致甲状腺发生。 ZVI还可以改善水解酸化和CH 4产率，但与NZVI相比，其效率相对较低，并且不能诱导细胞壁破裂。 16S RDNA高通量测序结果表明，NZVI在适当的剂量下添加促进增加涉及的微生物的比例是水解 - 酸化和甲状腺发生。

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  • 来源
    《RSC Advances》 |2018年第48期|共10页
  • 作者

    Wang Yayi; Wang Duanli; Fang Huiying;

  • 作者单位

    Tongji Univ Coll Environm Sci &

    Engn Shanghai Inst Pollut Control &

    Ecol Secur State Key Lab Pollut Control &

    Resources Reuse Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Coll Environm Sci &

    Engn Shanghai Inst Pollut Control &

    Ecol Secur State Key Lab Pollut Control &

    Resources Reuse Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Coll Environm Sci &

    Engn Shanghai Inst Pollut Control &

    Ecol Secur State Key Lab Pollut Control &

    Resources Reuse Siping Rd Shanghai 200092 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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