Effects of different conductive nanomaterials on anaerobic digestion process and microbial community of sludge
Effects of different conductive nanomaterials on anaerobic digestion process and microbial community of sludge
复制标题
不同导电纳米材料对污泥厌氧消化过程及微生物群落的影响
DOI：
10.1016/j.biortech.2020.123016
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发表时间：
2020-05-01
影响因子：
11.4
通讯作者：
Xiong, Weiping
中科院分区：
文献类型：
--
作者：
Chen, Yawen;Yang, Zhaohui;Xiong, Weiping
通过一项为期36天的发酵实验，研究了四种导电纳米材料（纳米碳粉、纳米氧化铝、纳米氧化锌、纳米氧化铜）对污泥厌氧消化（AD）性能和微生物群落的影响。结果表明，添加纳米碳粉和纳米氧化铝后，沼气产量分别提高了16.9%和23.4%，而添加纳米氧化锌和纳米氧化铜后，沼气产量分别降低了90.2%和17.3%。添加纳米碳粉和纳米氧化铝后，总固体（TS）去除效率分别提高了38.73%和27.11%，而添加纳米氧化锌和纳米氧化铜后，总固体去除效率分别降低了70.67%和43.70%。动力学分析表明，四种导电纳米材料可使厌氧消化污泥的延滞期平均缩短51.75%。16S rRNA扩增子测序结果显示，互营单胞菌属（Syntrophomonas）和甲烷鬃菌属（Methanosaeta）等微生物在纳米碳粉和纳米氧化铝反应器中富集。然而，添加纳米氧化锌和纳米氧化铜抑制了微生物群落的多样性和丰富度。冗余分析（RDA）表明，属于厚壁菌门（Firmicutes）和绿弯菌门（Chloroflexi）的菌属有助于甲烷生成过程。
The effects of four conductive nanomaterials (nano-carbon powder, nano-Al2O3, nano-ZnO, nano-CuO) on sludge anaerobic digestion (AD) performance and microbial community were investigated through a 36-day fermentation experiment. Results showed that biogas production enhanced by 16.9% and 23.4% with nano-carbon powder and nano-Al2O3 added but decreased by 90.2% and 17.3% with nano-ZnO and nano-CuO. Total solids (TS) removal efficiency was increased by 38.73% and 27.11% with nano-carbon powder and nano-Al2O3 added but decreased by 70.67% and 43.70% with nano-ZnO and nano-CuO. Kinetic analysis indicated four conductive nanomaterials could shorten the lag phase of AD sludge with an average rate of 51.75%. 16S rRNA amplicon sequencing results demonstrated microbes such as Syntrophomonas and Methanosaeta were enriched in nanocarbon powder and nano-Al2O3 reactors. However, microbial community diversity and richness were both inhibited by adding nano-ZnO and nano-CuO. Redundancy analysis (RDA) revealed that genera belong to Firmicutes and Chloroflexi could conduce to methanogenesis process.