摘要
采用批式实验,研究了(35±0.5)℃、搅拌速度65 r/min的厌氧消化体系中,p H值对玉米秸秆厌氧消化产甲烷的影响,分析了消化液相及固相特性的变化。结果表明,厌氧消化第7~9天时各系统VFA浓度均达到最大值,p H值为7和9时,挥发性脂肪酸(VFA)浓度显著高于其他系统,SCOD向VFA的转化效率较高。p H值为9时累积产气量增加速度最快,最大累计产气量达到134.33 m L/g VS。p H值为7时累计产气量最大,高达149.2 m L/g VS,是p H值为5和11系统的3.23和6.71倍。p H值为7和9时,沼气中甲烷的平均含量分别为64.1%和62.5%,比p H值为5和11的系统提高了约10%。p H值为7和9时VS去除率达到67.68%和58.87%,显著高于其他系统。控制厌氧消化p H值在7~9范围内可以有效提高木质纤维素生物质的产气效率。
Batch anaerobic digestion experiments were carried out to study the effect of p H value on biogas production in corn stover digestion at 35℃ and 65 r / min. The characteristics of liquid and solid change were analyzed. The results showed that volatile fatty acid( VFA) concentration in each system achieved the highest during the 7th to 9th day. The VFA concentration with a p H value of 7 and 9 was significantly higher than that of other systems,and more SCOD were converted to VFA. Cumulative biogas production increased fastest with a p H value of 9,and the total cumulative biogas production was 134. 33 m L / g VS. With a p H value of 7,the maximum cumulative biogas production was achieved with 149. 2 m L / g VS,which was 3. 23 and 6. 71 times of that with p H values of 5 and 11,respectively. With p H values of 7 and 9,average methane contents in biogas were64. 1% and 62. 5%,respectively,which increased by about 10% compared with that with p H values of 5 and11. The volatile solid( VS) removal were 67. 68% and 58. 87%,respectively,which were significantly higher than other systems. To control the p H value in a range of 7 ~ 9 can effectively improve the biogas production efficiency of lignocellulose biomass.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第6期2997-3001,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51178047)
关键词
PH值
玉米秸秆
厌氧消化
产气
挥发性脂肪酸
pH value
corn stover
anaerobic digestion
biogas production
volatile fatty acid
