The role of sulphate reduction in the anaerobic decomposition of carbohydrates, protein and fatty acids

研究了硫酸盐还原在碳水化合物和蛋白质厌氧分解中的作用。在厌氧流化床反应器中，以含硫酸盐的脱脂乳为底物，培养出以产酸为主的厌氧细菌。检测葡萄糖、半乳糖、乳糖和木糖的厌氧分解。木糖没有表现出分解，因为细菌对戊糖没有驯化。其它己糖显示出分解。总之，硫酸盐还原与碳水化合物的分解没有直接关系。在分解过程中，乳酸、丙酸和乙酸是主要的中间产物。硫酸盐还原发生在丙酸分解为乙酸的过程中。硫酸盐还原是一个以氢为电子受体的自养反应。碳水化合物分解的另一个中间产物是乙醇。硫酸盐还原与腐解过程无关。 ...更多信息 乙醇的位置。硫酸盐还原同样涉及丙酸向乙酸的转化。用蛋白胨对蛋白质的厌氧分解进行了研究。流化床以聚蛋白胨为底物适应性较好。在水力停留时间为60 min时，蛋白胨的降解率可达75%左右。保留时间越长，其效果越差。与通常达到95%左右的活性污泥的好氧分解相比，分解较低，可能是由于具有蛋白酶的厌氧细菌较少。氨基酸（Glu.，瓦尔.，Gly。，Met.，亮氨酸，菲和赖氨酸）。组成的蛋白胨作为厌氧分解的底物。所有氨基酸都能很好地分解并释放出丙酸、乙酸和氨。硫酸盐还原也与丙酸转化为乙酸的过程有关。虽然由于时间限制没有进行脂肪酸分解的研究，但硫酸盐还原在分解过程中的作用可能与碳水化合物和有机酸中的作用相同。少

The role of sulphate reduction in the anaerobic decomposition of carbohydrates and protein were investigated. In an anaerobic fluidized bed reactor, anaerobic bacteria of mainly acid formation grew by the feed of the substrate consisted of skimmed-milk with sulphate. Glucose, galactose, lactose and xylose were examined for the anaerobic decomposition. Xylose did not show the decomposition because of no acclimatization of the bacteria to the pentose. other hexoses showed the decomposition. In conclusion, the sulphate reduction does not directly relate to the decomposition of the carbohydrates. In the process of the decomposition, lactic acid, propionic acid and acetic acid are main intermediates. The sulphate reduction occured with the decomposition of propionic acid to acetic acid. The sulphate reduction was an autotrophic reaction using hydrogen as an electron acceptor. Another intermediate of carbohydrate decomposition was ethanol. The sulphate reduction did not relate to the decompo … More sition of ethanol. The sulphate reduction, again, relates to the conversion of propionic acid to acetic acid. Polypeptone was used to investigate the anaerobic decomposition of protein. The fluidized bed was well acclimated with the substrate of polypeptone. The decomposition of polypeptone reached about 75% with 60 min. of the hydraulic retention time. It was not improved with more longer retention time. Comparing to the aerobic decomposition of activated sludge which usually reaches about 95%, the decomposition was low probably due to less anaerobic bacteria which had enzymes of protease. The mixture of amino acids (Glu. ,Val. ,Gly. ,Met., Leu., Phe. and Lys.) which composed polypeptone were used as the substrate of the anaerobic decomposition. All amino acids well decomposed and released propionic acid, acetic acid and ammonia. The sulphate reduction , again, related in the process of the conversion of propionic acid to acetic acid. Although investigation of the decomposition of fatty acids was not conducted due to time limit, the role of sulphate reduction in the decomposition process may be the same as the role in the carbohydrates and organic acids. Less