Enhancing effects of activated carbon supported nano zero-valent iron on anaerobic digestion of phenol-containing organic wastewater.
Enhancing effects of activated carbon supported nano zero-valent iron on anaerobic digestion of phenol-containing organic wastewater.
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DOI：
10.1016/j.jenvman.2019.04.062
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发表时间：
2019-05
影响因子：
8.7
通讯作者：
Duo Dong;Ruikun Wang;P. Geng;Chunxi Li;Zhenghui Zhao
中科院分区：
文献类型：
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作者：
Duo Dong;Ruikun Wang;P. Geng;Chunxi Li;Zhenghui Zhao
制备了活性炭负载纳米零价铁材料（NZVI/AC），并将其添加到厌氧消化池中，以降低酚类物质的毒性抑制作用，提高含酚有机废水（POW）的甲烷产率。研究了不同苯酚浓度下POW的厌氧消化特性，包括有机物转化率、苯酚去除率和甲烷产率，并重点研究了NZVI/AC对POW厌氧消化的强化作用。当苯酚浓度低于500 mg/L时，POW的厌氧消化产甲烷量为387.5 mL，比不含苯酚的对照有机水高10.71%，而当苯酚浓度高于1000 mg/L时，厌氧消化受到严重抑制，产甲烷量仅为对照的50%。表明厌氧微生物对苯酚具有一定的耐受性，低浓度的苯酚会促进有机水的AD，而高浓度的苯酚则表现出严重的抑制作用。甲烷产率增加是由于微生物作用可能将苯酚转化为甲烷。在含500 mg/L苯酚的POW预处理中，添加NZVI/AC后，有机物的转化率由未加任何促进剂的对照组的37.49%提高到66.56%。苯酚的去除率也从39.03%提高到81.32%。累积产甲烷量比对照组增加145.5%~ 810 mL。NZVI/AC中的AC载体对酚类物质具有良好的吸附效果，降低了溶液中酚类物质的浓度，从而降低了酚类物质对微生物活性的毒害作用。负载于活性炭颗粒上的NZVI通过其良好的导电性，加强了产甲烷菌之间的电子传递，从而促进了有机物的AD性能。此外，NZVI对酚类物质具有微电解作用，可提高苯酚的去除率。因此，NZVI/AC可以作为一种有效的AD促进剂，用于POW的AD过程。
Activated carbon supported nano zero-valent iron material (NZVI/AC) was prepared and added to an anaerobic digestion tank to reduce the toxicity inhibition of phenols and increase the methane yield of phenol-containing organic wastewater (POW). The anaerobic digestion (AD) characteristics, including conversion rate of organic substances, removal rate of phenol, and methane yield of POW with different concentrations of phenol were studied, and moreover, the enhancing effects of NZVI/AC on the AD of POW were focused. When the concentration of phenol was below 500 mg/L, the methane yield from AD of POW was 387.5 mL, which was 10.71% higher than that from control organic water without phenol, however, phenol concentrations greater than 1000 mg/L severely inhibited AD, and methane yield was only 50% of the control sample. Indicating that anaerobic microorganisms had a certain degree of tolerance to phenol, and low concentration of phenol could promote AD of organic water although the phenol with high concentration showed severe inhibition. The methane yield increased due to the probable conversion of phenol to methane by microbial actions. In the AD of POW with 500 mg/L phenol, the conversion rate of organic substances increased from 37.49% (control group without any accelerant) to 66.56% after adding NZVI/AC. The removal rate of phenol also increased from 39.03% to 81.32%. Cumulative methane yield increased by 145.5%–810 mL compared with the control group. The AC carrier in NZVI/AC exerted a good adsorption effect on phenols, reducing the concentration of phenols in the solution and thus minimizing their toxic effects on microbial activity. The NZVI loaded on AC particles strengthened the electron transfer between methanogens by its good electrical conductivity, and then promoted the AD performance of organic matter. Furthermore, NZVI exerted a micro-electrolytic effect on phenolic substances, which could increase the removal rate of phenol. Therefore, NZVI/AC could be used as an efficient accelerant for the AD of POW to enhance the AD process.