SODIUM INHIBITION OF ACETOCLASTIC METHANOGENS IN GRANULAR SLUDGE FROM A UASB REACTOR
SODIUM INHIBITION OF ACETOCLASTIC METHANOGENS IN GRANULAR SLUDGE FROM A UASB REACTOR
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DOI：
10.1016/0141-0229(88)90094-4
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发表时间：
1988-01-01
影响因子：
3.4
通讯作者：
LETTINGA, G
中科院分区：
文献类型：
--
作者：
RINZEMA, A;VANLIER, J;LETTINGA, G
在不同的醋酸盐浓度和ph水平下，研究了钠对UASB反应器颗粒污泥中醋酸盐生成甲烷的影响。在中性pH下，5、10和14 g Na+ l-1对颗粒污泥的抑制作用分别为10%、50%和100%，相对于颗粒污泥的最大比乙酰破酯产甲烷活性而言。这些值反映了Methanothrix sp.对钠的敏感性，因为钠是本研究中使用的颗粒污泥中主要的醋酸破酯产甲烷菌。pH值在6.5 ~ 7.2范围内对钠的抑制作用没有显著影响，但在pH值接近8时，钠的抑制作用更为明显。当乙酸浓度低于500 mg l-1时，扩散限制部分掩盖了钠对颗粒污泥比活性的影响。在12周的时间内，甲烷菌对高浓度钠没有产生适应。在钠浓度约为。10g -1。在相同的钠浓度下，氯化钠对比活性的影响比硫酸钠更强，但对于设计目的而言，这种差异并不重要。用短期活度测量得到的结果可以可靠地用于预测钠盐对连续投料UASB反应器的影响。
The effect of sodium on the formation of methane from acetate in granular sludge from a UASB reactor has been determined at various acetate concentrations and pH-levels. At neutral pH sodium concentrations of 5, 10 and 14 g Na+ l-1 caused 10, 50 and 100% inhibition respectively, relative to the maximum specific acetoclastic methanogenic activity of the granular sludge. These values of reflect the sensitivity of Methanothrix sp. towards sodium, as this is the predominant acetoclastic methanogen in the granular sludge used in this study. The pH did not affect the inhibitory action of sodium significantly in the range 6.5-7.2, but at pH-levels near 8 the inhibition was more pronounced. At acetate concentrations below 500 mg l-1 diffusion limitation partly masked the influence of sodium on the specific activity of the granular sludge. No adaptation of Methanothrix sp. to high sodium concentrations could be obtained in a period of 12 weeks. Net growth of Methanothrix sp. could be obtained at sodium concentrations of approx. 10 g l-1. At equal sodium concentrations, sodium chloride had a somewhat stronger effect on the specific activity than sodium sulfate, but the difference is unimportant for design purposes. The results obtained with short term activity measurements can reliably be used for predictions of the effect of sodium salts on continuously fed UASB reactors.