摘要
在中温(35±1)℃条件下,用不同质量分数的NaOH溶液处理一次发酵后的互花米草,并进行批式中温厌氧二次发酵实验.分析了发酵过程中日产气量、累积产气量、甲烷含量、pH值、挥发性脂肪酸(VFA)的变化.结果表明,在总固体含量(TS)为6%的条件下,一次发酵产气率为317mL.g-1(以TS计),甲烷含量为71%,发酵过程中出现酸抑制现象.发酵后原料用4%、6%、8%的NaOH溶液处理后,在TS含量为6%的条件下进行二次发酵,仍均具有很好的产气特性,未出现酸化现象,产气率分别为262、276、282mL.g-1(以TS计),甲烷含量分别为72%、72%、69%.在一次发酵的基础上单位质量TS产气量分别增加了83%、87%、89%.这表明通过NaOH溶液的间歇式处理,能有效地提高互花米草厌氧消化的沼气产率.
The effect of intermittent NaOH solution treatment on anaerobic digestion with Spartina alterniflora was studied by batch experiments at （35±1）℃. The pH,volatile fatty acid （VFA）,and biogas yield were analyzed under the anaerobic digestion conditions. Efficient biogas production was observed at a TS loading rate of 6%. The rate of gas production during the first anaerobic digestion process was 317 mL·g-1TS with a methane content of 71%. To improve the gas yield of anaerobic digestion with S. alterniflora,NaOH solutions with varied concentrations of 4%,6% and 8% were applied to the fermented S. alterniflora,which was then subjected to secondary anaerobic digestion. The rates of gas production in the second anaerobic digestion were found to be 262,276 and 282 mL·g-1TS,where the methane contents were 72%,72% and 69% respectively. In comparison with the first anaerobic digestion process,the gas production further improved by 83%,87% and 89% upon intermittent NaOH solution treatment. The present study demonstrates that enhanced gas production can be achieved using intermittent NaOH solution treatment.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第10期2017-2021,共5页
Acta Scientiae Circumstantiae
基金
"十一五"国家重大科技水专项(No.2008ZX07001-004
2008ZX07001-005)~~
关键词
互花米草
NaOH间歇式处理
发酵
Spartina alterniflora
NaOH-posttreatment
anaerobic digestion
