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

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,H_2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H_2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。

A batch experiment for hydrogen generation from apple waste and excess sludge by anaerobic digestion was conducted at the mesophilic temperature of 37 I 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）.