Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China.
Shaoxing Environmental Monitoring Center, Shaoxing 312000, China.
Bioresour Technol. 2019 Oct;289:121713. doi: 10.1016/j.biortech.2019.121713. Epub 2019 Jun 27.
Alkaline fermentation technology is an effective method for resource recovery, e.g., short-chain fatty acids (SCFAs), but the acidification process needs to be further enhanced. To improve the release and acidification of organic matters in waste activated sludge (WAS) fermentation simultaneously, a novel method was proposed with magnetite addition under alkaline condition in this study. Compared with the control, SCFAs and acetic acids yields increased by 21.2% ± 3.1% and 31.0% ± 1.2% in the 0.6 g/gVSS magnetite-based system, respectively. Besides, the activities of α-glucosidase, protease and acetate kinase (AK) were enhanced with magnetite addition, and the abundance of acidogenic microbes was improved obviously. Furthermore, magnetite reduced the release of PO-P significantly via the precipitation reaction. Of all, a novel side-stream WAS hydrolysis and acidification process based on magnetite addition under suitable alkaline condition is proposed, realizing the efficient recovery of carbon and phosphorus resources along with wastewater and WAS treatment.
碱性发酵技术是一种有效的资源回收方法，例如短链脂肪酸（SCFAs），但酸化过程需要进一步加强。为了同时提高废活性污泥（WAS）发酵中有机物的释放和酸化，本研究提出了一种在碱性条件下添加磁铁矿的新方法。与对照组相比，在基于 0.6 g/gVSS 磁铁矿的系统中，SCFAs 和乙酸产量分别提高了 21.2%±3.1%和 31.0%±1.2%。此外，添加磁铁矿还提高了α-葡萄糖苷酶、蛋白酶和乙酸激酶（AK）的活性，明显增加了产酸菌的丰度。此外，磁铁矿通过沉淀反应显著减少了 PO-P 的释放。总之，提出了一种基于合适碱性条件下添加磁铁矿的新型侧流 WAS 水解酸化工艺，实现了废水和 WAS 处理的同时，高效回收碳和磷资源。
