Effect of initial pH on short chain fatty acid production during the anaerobic fermentation of membrane bioreactor sludge enhanced by alkyl polyglcoside
Effect of initial pH on short chain fatty acid production during the anaerobic fermentation of membrane bioreactor sludge enhanced by alkyl polyglcoside
复制标题
烷基多糖苷强化膜生物反应器污泥厌氧发酵过程初始pH对短链脂肪酸产量的影响
DOI：
10.1016/j.ibiod.2015.06.012
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发表时间：
2015
影响因子：
4.8
通讯作者：
Guangming Zeng
中科院分区：
文献类型：
--
作者：
Jianwei Zhao;Qi Yang;Xiaoming Li;Dongbo Wang;Hongxue An;Ting Xie;Qiuxiang Xu;Yongchao Deng;Guangming Zeng
膜生物反应器（MBR）污泥厌氧发酵生产短链脂肪酸（SCFA）因其能在生产增值产品的同时减少污泥体积而备受关注。然而，由于污泥水解率低和产甲烷菌的快速消耗，从污泥中生产短链脂肪酸总是受到限制。本研究通过在MBR污泥中添加生物表面活性剂烷基聚糖苷（APG）来提高短链脂肪酸的产量，从而开发出一种高效、绿色的策略。实验结果表明，当APG最佳投加量为0.2 g/g干污泥（DS）时，SCFA的产率达到282.9 mg /g挥发性悬浮固体（VSS），是空白的4.8倍。此外，还研究了在APG存在的情况下，初始pH在4 ~ 12范围内对SCFA产量的影响。结果表明，在初始pH值为碱性的MBR污泥中，APG的产SCFA效率高于初始pH值为酸性和接近中性的污泥，最佳初始pH值为11。
Membrane bioreactor (MBR) sludge anaerobic fermentation for short chain fatty acid (SCFA) production has drawn much attention as it can produce value-added product and reduce sludge volume simultaneously. However, SCFA production from sludge is always limited due to the low hydrolysis rate and rapid consumption by methanogens. In this study, an efficient and green strategy was developed by adding biosurfactant alkyl polyglycoside (APG) into MBR sludge to enhance SCFA production. Experimental results showed that the yield of SCFA reached 282.9 mg chemical oxygen demand (COD)/g volatile suspended solids (VSS) with the optimum APG dosage of 0.2 g/g dry sludge (DS), which was 4.8-fold of the blank. Furthermore, the effect of initial pH ranging from 4 to 12 on SCFA production in the presence of APG was also studied. Results showed SCFA productions from MBR sludge in the presence of APG at initial alkaline pH values were more efficient than those at acidic and near-neutral pH values, and the optimum initial pH was 11.