| 厌氧消化过程中镍及其螯合物的生物可利用性研究 |
| 摘要点击 2516 全文点击 2075 投稿时间：2010-01-29 修订日期：2010-06-24 |
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| 中文关键词 厌氧消化 甲烷 金属离子螯合剂 镍 生物吸收 |
| 英文关键词 anaerobic digestion methane metal ion chelators nickel biouptake |
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| 中文摘要 |
| 通过厌氧消化静态实验，研究了不同螯合剂存在条件下，产甲烷富集培养物对微量元素镍及其螯合物的生物吸收. 结果表明，螯合剂的种类对厌氧消化有着一定影响. 在乙酸钠浓度为85 mmol/L， 硫化物浓度为1 mmol/L， 消化温度为35℃，镍离子浓度为200 μmol/L时，氨三乙酸（NTA）的添加体系中甲烷产量最高，分别比柠檬酸（CA）、 乙二胺四乙酸(EDTA)添加体系高出15%和9%. 而当镍离子浓度为100 μmol/L时，氨三乙酸的添加体系中甲烷产量分别比CA、 EDTA添加体系高出43%和57%. 产甲烷富集培养物对镍的生物吸收与镍的螯合物形态有着密切关系. NTA最易促进生物吸收，EDTA次之，而CA对镍的生物吸收促进作用最小. |
| 英文摘要 |
| The biouptake of nickel and its complexes for methanogenic enrichment in the presence of different chelators during batch methane fermentation were investigated in this paper. The results showed that the chelators had obvious effects on anaerobic digestion. At sodium acetate concentration of 85 mmol/L, sulfides concentration of 1 mmol/L, nickel concentration of 200 μmol/L and temperature was 35℃, methane production in the NTA added system were 15% and 9% which was higher than that in CA and EDTA amended ones. While nickel concentration was 100 μmol/L, methane production in NTA added system were 43% and 57% which was higher than that in CA and EDTA amended ones. The biouptake of nickel for methanogenic enrichment related to the species of nickel complexes. NTA was the best chelator for stimulating nickel biouptake in the anaerobic reactors, and EDTA was the better one. The biouptake of Ni-CA complexes was the minimum for the methanogenic enrichment. |
