Recently, biochar derived from various biomass sources has been used successfully as a conductive material to boost methane generation in anaerobic digestion (AD). Compared with other biomass charcoals, pinecone biochar (PBC) is characterised by large specific surface area, more oxygen functional groups, and better stability, which enables it to be more and better loaded with nanozero-valent iron (nZVI) to form nZVI@PBC. However, sufficient information is not available on how nZVI@PBC would improve the performance of anaerobic treatment. In this study, innovative nZVI@PBC composites, which has a larger specific surface area (SSA), were developed successfully and then used to enhance the AD of Liquor Brewing Wastewater (LBW) in batch reactors. Adding nZVI@PBC in the AD flasks shortened the lag period, sped up the LBW's hydrolysis, and improved methane production by 2.98 times comparing to the Blank. The nZVI loaded on PBC dissolved during the AD process, and alkaline functional groups were detached from precipitation, leading to reduction of VFA accumulation, enhanced organic waste degradation and adsorption of ammonia and nitrogen. In addition, nZVI@PBC enriched the key hydrolytic and methanogenic bacteria by 1.6 times and 52 %, and increased the system's electron transfer system activity by 6.6 % and 16.5 % as well as the conductivity by 10.6 % and 40.4 % as compared to the reactors added with PBC or the control reactors.

中文翻译：

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nZVI@PBC 在强化白酒酿造废水厌氧消化中的作用及机理


最近，来自各种生物质来源的生物炭已成功用作导电材料，以促进厌氧消化 （AD） 中甲烷的产生。与其他生物质炭相比，松果生物炭 （PBC） 具有比表面积大、氧官能团多、稳定性好等特点，使其能够越来越多地与纳米零价铁 （nZVI） 一起负载形成nZVI@PBC。然而，关于nZVI@PBC如何改善厌氧治疗的性能，尚无足够信息。在本研究中，成功开发了具有更大比表面积 （SSA） 的创新nZVI@PBC复合材料，然后用于增强间歇式反应器中白酒酿造废水 （LBW） 的 AD。与 Blank 相比，在 AD 培养瓶中添加 nZVI@PBC 缩短了滞后时间，加快了 LBW 的水解速度，并将甲烷产量提高了 2.98 倍。负载在 PBC 上的 nZVI 在 AD 过程中溶解，碱性官能团从沉淀中分离出来，导致 VFA 积累减少，增强有机废物降解和氨氮吸附。此外，与添加 PBC 的反应器或对照反应器相比，nZVI@PBC 富集了 1.6 倍和 52 % 的关键水解和产甲烷细菌，并将系统的电子转移系统活性提高了 6.6 % 和 16.5 %，电导率提高了 10.6 % 和 40.4 %。