RSI-MO反应器强化沼气原位深度脱硫研究

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Abstract To achieve biogas in-situ deep desulfurization of waste-activated sludge (WAS) anaerobic digestion. An integrated rusty scrap iron-micro-oxygen (RSI-MO) anaerobic digestion process was constructed embedding optimal RSI dosage (20g/L) and providing micro-oxygen condition to explore the influence of RSI-MO process on anaerobic digestion in-situ desulfurization performance. This semi-continuous anaerobic/microaerobic experiment was carried out in seven stages (P1~P7). The first stage (P1) was set as a control group. RSI was added in the second stage (P2). And increasing O₂ levels were introduced stepwise in P3~P7stages. The results showed that supplementary O₂ induced sulfur-oxidizing bacteria microbial oxidation of sulfide to elemental sulfur and chemical oxidative corrosion of iron to form ironic sulfide precipitate. It promoted the sulfide solidification by coupling of biological desulfurization with chemical desulfurization. From P3 to P7, the content of H₂S in biogas decreased and residual oxygen increased with rising of O₂ dose, respectively. The optimum performance was considered on the basis of anaerobic digestion efficiency and desulfurization property, which was obtained in P6. The methane yield was 301.1mL/gCOD, and the H₂S concentration was 113mg/m³. The average methane yield increased by 37.65% comparing with P1. What’s more, the H₂S removal efficiency in biogas decreased by 99.40%. According to the analysis of sulfur balance, it was found that the sulfur contents in solid-liquid-gas three phases accounted for 84.0, 11.9 and 0.21 percent of total sulfur in P6, respectively. It is indicated that the integrated process of RSI-MO anaerobic digestion could benefit biogas in-situ deep desulfurization.

Key words： micro-oxygen effect iron corrosion methane yield desulfurization efficiency sulfur balance

Received: 28 May 2020

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X705

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	Articles by authors
	RUAN Ren-jun
	XIANG Jing-wei
	ZHAO Jun-jie
	ZHAO Chang-shuang
	SUN Jun-wei
	ZHAO Wei
	CAO Jia-shun

Cite this article:

RUAN Ren-jun,XIANG Jing-wei,ZHAO Jun-jie等. Study of combining rusty scrap iron with micro-oxygen to enhance biogas in-situ deep desulfurization[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 247-253.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/247

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