Simultaneous H2S mitigation and methanization enhancement of chicken manure through the introduction of the micro-aeration approach.,Chemosphere

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Simultaneous H2S mitigation and methanization enhancement of chicken manure through the introduction of the micro-aeration approach.
Chemosphere ( IF 8.1 ) Pub Date : 2020-04-07 , DOI: 10.1016/j.chemosphere.2020.126687
Ahmed Mahdy ₁ , Yunlong Song ₂ , Ali Salama ₃ , Wei Qiao ₂ , Renjie Dong ₂

Affiliation

The impact on H2S alleviation and methane yield enhancement after submitting the anaerobic digestion of chicken manure to a finite amount of air was investigated. The largest reduction in the H2S biogas content (58% lower) occurred when air intensity of 30 ml/g VSin was injected into the reactors. Consequently, a maximum methane yield (335 mL-g VSin-1), which was 77% higher than the control, was concurrently achieved. Slight sulfate accumulation (<330 mg L-1) was observed inside the micro-aerated digesters with higher air intensities, suggesting a suppression of sulfide inhibition. Bacterial diversity/richness was enhanced in these digesters while the relative abundance of Methanocelleus increased by 36%. The most important contributing factor to enhancement was the synergistic effect resulting from increments in the hydrolysis rate and the suppression of sulfide inhibition. The results highlighted the potential of in situ H2S mitigation with the added benefit of methane yield enhancement.

中文翻译：

通过引入微曝气方法，可同时减轻H2S和提高鸡粪甲烷化率。

研究了将鸡粪厌氧消化至一定量的空气后，对缓解H2S和降低甲烷产量的影响。当向反应器中注入30 ml / g VSin的空气强度时，H2S沼气含量的减少幅度最大（降低了58％）。因此，同时获得了最高甲烷产量（335 mL-g VSin-1），比对照高出77％。在具有较高空气强度的微曝气消化池内观察到少量硫酸盐积累（<330 mg L-1），表明抑制了硫化物的抑制。这些消化池中的细菌多样性/丰富度得到提高，而甲烷八叠球菌的相对丰度提高了36％。增强作用最重要的因素是水解速率增加和抑制硫化物抑制所产生的协同作用。结果强调了原位硫化氢缓解的潜力以及甲烷产量提高的额外好处。

更新日期：2020-04-08

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