Novel stepwise pH control strategy to improve short chain fatty acid production from sludge anaerobic fermentation.
Novel stepwise pH control strategy to improve short chain fatty acid production from sludge anaerobic fermentation.
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DOI：
10.1016/j.biortech.2017.10.050
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发表时间：
2018-02
影响因子：
11.4
通讯作者：
Jianwei Zhao;Dong-bo Wang;Yiwen Liu;H. Ngo;Wenshan Guo;Qi Yang;Xiaoming Li
中科院分区：
文献类型：
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作者：
Jianwei Zhao;Dong-bo Wang;Yiwen Liu;H. Ngo;Wenshan Guo;Qi Yang;Xiaoming Li
这项研究报告了一种称为逐步 pH 发酵的创新策略，该策略旨在提高废弃活性污泥 (WAS) 厌氧发酵中短链挥发性脂肪酸 (SCFA) 的产量。实验结果证实WAS破坏和酸化的最佳pH分别为11和9，相应的最佳时间分别为5d和2d。在这种情况下，最佳SCFA产量为2356mg化学需氧量（COD）/L，远高于碱性发酵系统的产量。机理研究表明，pH 11可加速WAS的破坏，抑制产甲烷菌的活性；此外，pH 9有利于产酸菌的活性，从而产生更多的SCFA。逐步 pH 发酵与 WAS 中存在的氯化钠 (NaCl) 相结合，对 WAS 厌氧发酵具有协同影响。
This study reports an innovative strategy known as stepwise pH fermentation, developed to enhance the production of short chain volatile fatty acids (SCFA) from waste activated sludge (WAS) anaerobic fermentation. Experimental results confirmed the optimal pH for WAS disruption and acidification was 11 and 9, respectively, and corresponding optimal time was, respectively, 5 d and 2 d. In this scenario, the optimal SCFA yield was 2356 mg chemical oxygen demand (COD)/L, which was much higher than that derived from alkaline fermentation system. Investigation of the mechanism indicated that pH 11 could accelerate the disruption of WAS and inhibit the activities of methanogens; furthermore, pH 9 was beneficial to the activity of acid-producing bacteria, resulting in more SCFA production. Stepwise pH fermentation integrated with sodium chloride (NaCl) present in WAS had synergistic impacts on WAS anaerobic fermentation.