苹果渣与剩余污泥混合消化产氢性能研究

Hydrogen Production from Apple Waste and Excess Sludge by Anaerobic Co-Digestion

DOI：10.3969/j.issn.1673-1689.2017.08.002

中文关键词: 苹果渣 剩余污泥 混合消化 氢气 脱氢酶

英文关键词: apple waste,excess sludge,anaerobic co-digestion,hydrogen,dehydrogenase enzyme

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中文摘要:

以苹果渣和剩余污泥为消化底物，在温度为37 ℃，初始pH值为8.0的条件下进行批式厌氧消化产氢试验，比较单独消化和混合消化的产气性能.结果表明，苹果渣组和剩余污泥组单独厌氧消化时，H2产量分别是11.5 mL/gVS和8.6 mL/gVS，混合厌氧消化时，混合组的H2产量达到16.9 mL/gVS，比计算值提高了68.16%。剩余污泥组的pH值最高，苹果渣组中SCOD浓度最高，混合组的pH值和SCOD浓度均介于两个单独消化组之间，这是由于混合组能均衡两种有机底物的营养成分，提高系统的缓冲能力。这说明混合消化不单单是两种有机物的简单叠加，两者之间相互促进，存在一定的协同作用，混合消化能够提高产氢效率。另外在整个反应过程中，苹果渣组脱氢酶的活性很低，混合组高于苹果渣组，混合组脱氢酶活性最大为384 TFμg/（mL·h），且基本维持在340 TFμg/（mL·h）左右。

英文摘要:

A batch experiment for hydrogen generation from apple waste and excess sludge by anaerobic digestion was conducted at the mesophilic temperature of 37 ℃ and with the initial pH of 8.0. Results showed that hydrogen yield was 11.5 mL/gVS and 8.6 mL/gVS with single-digestion of apple waste and excess sludge，respectively. The hydrogen yield of co-digestion group reached 16.9 mL/gVS，which was increased by 68.16% as compared with the calculated value of co-digestion group. The pH value of excess sludge group was the highest，while the SCOD of apple waste group was the highest.Values of pH and SCOD of co-digestion group were between those for two single-digestion groups due to the well-balanced nutrients of two organic wastes，and the strong buffer capacity of the reactor system. These indicated that co-digestion was not just the simple sum of the two organic matters，and there was a certain synergic effect in the co-digestion process，which made the hydrogen production efficiency of co-digestion group enhanced. In addition，the dehydrogenase activity of co-digestion group was significantly higher than that of apple waste group during the whole process. The dehydrogenase activity of co-digestion group maintained around 340 TFμg/（mL·h），with a maximum value of 384 TFμg/（mL·h）.

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