| COD/SO42-对青霉素菌渣厌氧消化影响 |
| 摘要点击 1571 全文点击 523 投稿时间：2017-09-22 修订日期：2018-01-18 |
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| 中文关键词 厌氧消化 产甲烷 COD/SO42- 去除率 产气潜能 |
| 英文关键词 anaerobic digestion methane production COD/SO42- organics removal rate biogas production potential |
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| 中文摘要 |
| 针对抗生素菌渣厌氧消化过程SO42-的抑制问题，利用批试实验对不同COD/SO42-比青霉素菌渣厌氧消化产气潜能以及产酸相物质利用特性进行了研究.结果表明，COD/SO42-≥3时，微生物发生了适应性驯化，产气潜能在发酵10 d后逐渐恢复，累积产甲烷量（以TS计）超过208 mL·g-1，超过71%的COD转化为CH4；COD/SO42-≤1.5时，产甲烷分别受到49%及完全抑制，有机物及SO42-的去除率分别不足17%和5%，表明较高SO42-负荷下产甲烷菌（MPB）及硫酸盐还原菌（SRB）同时发生抑制，COD平衡分析表明，转化为CH4的COD不足9.1%，而还原为SO42-的COD保持在5.0%~9.0%，说明MPB比SRB对S2-的抑制更为敏感；S平衡分析表明，还原的SO42-大部分以S2-的形式存在于发酵液中，少部分以H2S的形式存在于生物气中；产酸过程物质利用特性分析表明，溶解性蛋白质的甲烷化是在溶解性碳水化物甲烷化之后才开始. |
| 英文摘要 |
| In order to assess the sulfate-induced inhibition of anaerobic digestion of antibiotic manufacturing bio-waste. The effect of COD/SO42- ratio on biogas production potential and substrate utilization characteristics during the acidogenic phase of anaerobic digestion of penicillin bacterial residues were investigated through batch experiments. The results obtained indicated that biogas production was gradually enhanced after 10 days of anaerobic digestion. However, the maximum cumulative methane production probably exceeded about 208 mL·g-1(on TS basis) since COD/SO42-≥3. Because adaptive acclimation, more than 71% COD removal, which may have been converted to methane, was achieved. Consequently, at COD/SO42-≤1.5, methane production was suppressed by 49% and 100% when the organics and SO42- removal rates were less than 17% and 5%, respectively. This indicated that methanogens and sulfate-reducing bacteria were inhibited at high sulfate loading rates. In addition, the COD balance analysis revealed that less than 9.1% of the COD was converted to methane. However, 5.0%-9.0% of the COD was used for sulfate reduction. This means that methanogens are more susceptible than sulfate-reducing bacteria to sulfide-induced inhibition. The S balance showed that the reduced sulfate was mainly present as sulfide in the digester. A small fraction of it was present as hydrogen sulfide in the biogas. The analysis of substrate utilization characteristics during the acidogenic phase revealed that methanation of soluble protein was initiated after methanation of soluble carbohydrate. |
