Wang Yanzi, Ren Guangxin, Zhang Tong, Zou Shuzhen, Mao Chunlan, Wang Xiaojiao
College of Forestry, Northwest A&F University, Yangling 712100, Shannxi, China; Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, Shannxi, China.
College of Agronomy, Northwest A&F University, Yangling 712100, Shannxi, China; Research Center of Recycle Agricultural Engineering and Technology of Shannxi Province, Yangling 712100, Shannxi, China.
Waste Manag. 2017 Aug;66:46-52. doi: 10.1016/j.wasman.2017.04.031. Epub 2017 Apr 29.
This study investigated the effects of different amounts of magnetite powder (i.e., 0g, 1.5g, 3g, 4.5g, 6g) on the anaerobic co-digestion of pig manure (PM) and wheat straw (WS). The variations in pH, alkalinity, cellulase activity (CEA), dehydrogenase activity (DHA) and methane production, were analyzed by phases. Correlation of the activities of the two enzymes with methane production was also analyzed, and the Gompertz model was used to evaluate the efficiency of anaerobic digestion (AD) with the addition of magnetite powder. The results showed that magnetite powder had significant effects on the anaerobic co-digestion of PM and WS. The maximum total methane production with the addition of 3g of magnetite powder was 195mL/g total solids (TS), an increase of 72.1%. The CEA and DHA increased with magnetite powder in the ranges of 1.5-4.5g, 1.5-6g, respectively, while the methane production showed a better correlation with DHA than with CEA. Using the Gompertz model, the efficiency of AD was optimal when adding 3g magnetite powder, with higher methane production potential (206mL/g TS), shorter lag-phase time (14.9d) and shorter AD period (44d).
本研究调查了不同量的磁铁矿粉（即0g、1.5g、3g、4.5g、6g）对猪粪（PM）和小麦秸秆（WS）厌氧共消化的影响。分阶段分析了pH值、碱度、纤维素酶活性（CEA）、脱氢酶活性（DHA）和甲烷产量的变化。还分析了两种酶的活性与甲烷产量的相关性，并使用Gompertz模型评估添加磁铁矿粉后的厌氧消化（AD）效率。结果表明，磁铁矿粉对PM和WS的厌氧共消化有显著影响。添加3g磁铁矿粉时，最大总甲烷产量为195mL/g总固体（TS），增加了72.1%。CEA和DHA分别在磁铁矿粉含量为1.5 - 4.5g、1.5 - 6g范围内增加，而甲烷产量与DHA的相关性比与CEA的相关性更好。使用Gompertz模型，添加3g磁铁矿粉时AD效率最佳，甲烷产量潜力更高（206mL/g TS），滞后期更短（14.9d），AD周期更短（44d）。
