摘要
对污泥进行不同pH值的酸性预处理，用HCl将污泥pH值分别调到2.0、3.0、4.0、5.0，在4℃条件下放置24 h，然后再用NaOH分别调到2.0～12.0用于批量试验，系统考察了不同初始pH值对酸性预处理污泥厌氧发酵产氢的影响.研究表明，初始pH为2.0～4.0以及12.0时对产氢菌及耗氢菌有抑制作用，总体产氢量少;初始pH为5.0～9.0时，甲烷菌及产氢菌均活跃，产氢滞后时间短，但总体产氢量少;初始pH为11.0时，甲烷菌受到明显抑制，而产氢菌仍然活跃，总体产氢量较高，发酵后期pH恒定在7.0～8.0，经pH为2.0、3.0、4.0和5.0酸性预处理的污泥（干重）累积产氢量分别为0.59、1.83、0.50和0.56 mL/g。
A series of batch tests were conducted to investigate the effects of initial pH on bio-hydrogen production from acid pretreated municipal sludge. The pH of sludge was first adjusted to 2.0, 3.0, 4.0 and 5.0, stood by for 24 h in a refrigerator at 4℃ , then adjusted to pH 2.0-12.0 respectively before using as the substrates for batch experiments. The results showed that the acid pretreated sludge with initial pH 11.0 gave the highest hydrogen production, and the corresponding accumulative hydrogen for sludge（dry basis） pretreated at pH 2.0, 3.0, 4.0 and 5.0 were 0.59, 1.83, 0.50 and 0.56 mL/g respectively. Hence, it could be seen that the initial pH 11.0 for the acid pretreated sludge should be the optimum pH range for promoting the growth of dominant hydrogen-producing anaerobes, while inhibiting hydrogen- consuming anaerobes. Meanwhile it also could be concluded that both hydrogenogen and methanogen were inhibited at the initial pH 2.0 to 4.0 and 12.0, which resulted in a low hydrogen production. Although the hydrogenogen and methanogen could be promoted at the initial pH 5.0 to 9.0, the corresponding hydrogen production was still quite low.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2008年第9期2628-2632,共5页
Environmental Science
基金
福建省科技厅重点项目(2005Y012)
上海市科学技术委员会科研计划项目(06dz12006)
污染控制与资源化研究国家重点实验室青年自然科学基金预研项目(PCRRYF06002)
关键词
市政污泥
酸处理
生物产氢
厌氧发酵
pH
municipal sludge
acid pretreatment
bio-hydrogen production
anaerobic fermentation
pH
