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Low-Temperature Pretreatment of Organic Feedstocks with Selected Mineral Wastes Sustains Anaerobic Digestion Stability through Trace Metal Release.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-17 , DOI: 10.1021/acs.est.0c01732 Burhan Shamurad 1 , Neil Gray 2 , Evangelos Petropoulos 1 , Jan Dolfing 1 , Marcos Quintela-Baluja 1 , Reihaneh Bashiri 1 , Shamas Tabraiz 1 , Paul Sallis 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-06-17 , DOI: 10.1021/acs.est.0c01732 Burhan Shamurad 1 , Neil Gray 2 , Evangelos Petropoulos 1 , Jan Dolfing 1 , Marcos Quintela-Baluja 1 , Reihaneh Bashiri 1 , Shamas Tabraiz 1 , Paul Sallis 1
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A low-cost approach for enhancing mesophilic (37 °C) anaerobic digestion (AD) of organic waste using a low-temperature (37 °C) pretreatment with different mineral wastes (MW) was investigated. A higher and stable methane production rate, in comparison to MW-free controls, was achieved for 80 days at organic loading rates of 1–2 g VS/L·d, using a feed substrate pretreated with incinerator bottom ash (IBA). The boiler ash and cement-based waste pretreatments also produced high methane production rates but with some process instability. In contrast, an incinerator fly ash pretreatment showed a progressive decrease in methane production rates and poor process stability, leading to reactor failure after 40 days. To avoid process instability and/or reactor failure, two metrics had to be met: (a) a methanogenesis to fermentation ratio higher than 0.6 and (b) a cell-specific methanogenic activity to cell-specific fermentation activity ratio of >1000. The prevalence of Methanofastidiosum together with a mixed community of acetoclastic (Methanosaeta) and hydrogenotrophic (Methanobacterium) methanogens in the stable IBA treatment indicated the importance of Methanofastidiosum as a potential indicator of a healthy and stable reactor.
中文翻译：
通过选择的矿物废物进行低温的有机原料预处理，可通过释放微量金属来维持厌氧消化的稳定性。
研究了使用低温（37°C）预处理不同矿物废物（MW）来增强有机废物的中温（37°C）厌氧消化（AD）的低成本方法。与使用无MW的对照相比，使用以焚烧炉底灰（IBA）预处理的进料基质，在1-2 g VS / L·d的有机负载量下，可实现80天更高且稳定的甲烷生产率。锅炉灰渣和水泥基废物的预处理也产生了很高的甲烷生产率，但过程不稳定。相反，焚烧炉的粉煤灰预处理显示甲烷生产率逐渐降低，工艺稳定性较差，导致40天后反应堆故障。为了避免过程不稳定和/或反应器故障，必须满足两个指标：（a）甲烷生成与发酵的比率高于0。在图6和（b）中，细胞特异性产甲烷活性与细胞特异性发酵活性之比＞ 1000。患病率Methanofastidiosum连同乙酸分解（混合社区Methanosaeta）和氢营养（甲烷在稳定IBA处理）甲烷指示的重要性Methanofastidiosum作为健康和稳定反应器的潜在指标。
更新日期：2020-07-21
中文翻译：
通过选择的矿物废物进行低温的有机原料预处理，可通过释放微量金属来维持厌氧消化的稳定性。
研究了使用低温（37°C）预处理不同矿物废物（MW）来增强有机废物的中温（37°C）厌氧消化（AD）的低成本方法。与使用无MW的对照相比，使用以焚烧炉底灰（IBA）预处理的进料基质，在1-2 g VS / L·d的有机负载量下，可实现80天更高且稳定的甲烷生产率。锅炉灰渣和水泥基废物的预处理也产生了很高的甲烷生产率，但过程不稳定。相反，焚烧炉的粉煤灰预处理显示甲烷生产率逐渐降低，工艺稳定性较差，导致40天后反应堆故障。为了避免过程不稳定和/或反应器故障，必须满足两个指标：（a）甲烷生成与发酵的比率高于0。在图6和（b）中，细胞特异性产甲烷活性与细胞特异性发酵活性之比＞ 1000。患病率Methanofastidiosum连同乙酸分解（混合社区Methanosaeta）和氢营养（甲烷在稳定IBA处理）甲烷指示的重要性Methanofastidiosum作为健康和稳定反应器的潜在指标。
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