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Cultivation of phagotrophic algae with microbial cells released from waste activated sludge: an evaluation of different pretreatment methods to enhance release of microbial cells from sludge flocs
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.psep.2020.08.034
Cong Li , Ying Chen , Diao Qin , Yao Chen

Abstract The application of phagotrophic algae in waste activate sludge (WAS) treatment can largely accelerate WAS organics reclamation rate, because the phagotrophic capability of phagotrophic algae on intact microbial cells provides an efficient and fast way to digest microbial cells, which eliminate the need of the time-consuming hydrolysis of WAS solid organics. In this research work, different pretreatment methods of anoxia, alkali, and ultrasound were compared in terms of efficiency in releasing microbial cells from WAS flocs and subsequent growth of phagotrophic algae. Results show that ultrasonic pretreatment was the most efficient method since it yielded the highest microbial cell release and subsequent algae growth, while requiring the shortest pretreatment time. Mathematical modelling shows that the release of microbial cells in anoxic and ultrasonic pretreatment was achieved mainly through breaking physical forces of attraction, while the release of microbial cells in alkali pretreatment was achieved through breaking ionic bonds. Re-floc of released microbial cells was observed during algae growth, and the microbial cells released through breaking ionic bonds were less liable to reform floc. The electricity consumption of ultrasonic pretreatment was the highest, which was 6.9 times and 17.9 times of that of alkali and anoxic pretreatment. The electricity consumption of ultrasonic pretreatment can be reduced by performing alkali pretreatment prior to ultrasonic pretreatment.

中文翻译:

用废弃活性污泥释放的微生物细胞培养吞噬藻类:评估不同预处理方法以增强污泥絮体中微生物细胞的释放

摘要 吞噬藻类在废物活性污泥(WAS)处理中的应用可以大大加快 WAS 有机物的回收率,因为吞噬藻类对完整微生物细胞的吞噬能力提供了一种高效、快速的消化微生物细胞的方式,从而消除了对 WAS 有机物回收的需要。 WAS固体有机物的耗时水解。在这项研究工作中,在从 WAS 絮状物中释放微生物细胞和随后的吞噬藻类生长的效率方面,比较了缺氧、碱和超声波的不同预处理方法。结果表明,超声波预处理是最有效的方法,因为它产生最高的微生物细胞释放和随后的藻类生长,同时需要最短的预处理时间。数学模型表明,缺氧和超声预处理中微生物细胞的释放主要是通过破坏物理吸引力来实现的,而碱预处理中微生物细胞的释放是通过破坏离子键来实现的。在藻类生长过程中观察到释放的微生物细胞重新絮凝,通过破坏离子键释放的微生物细胞不太容易重新絮凝。超声波预处理的耗电量最高,分别是碱和缺氧预处理的6.9倍和17.9倍。在超声波预处理之前进行碱预处理可以减少超声波预处理的电耗。而碱预处理中微生物细胞的释放是通过破坏离子键来实现的。在藻类生长过程中观察到释放的微生物细胞重新絮凝,通过破坏离子键释放的微生物细胞不太容易重新絮凝。超声波预处理的耗电量最高,分别是碱和缺氧预处理的6.9倍和17.9倍。在超声波预处理之前进行碱预处理可以减少超声波预处理的电耗。而碱预处理中微生物细胞的释放是通过破坏离子键来实现的。在藻类生长过程中观察到释放的微生物细胞重新絮凝,通过破坏离子键释放的微生物细胞不太容易重新絮凝。超声波预处理的耗电量最高,分别是碱和缺氧预处理的6.9倍和17.9倍。在超声波预处理之前进行碱预处理可以减少超声波预处理的电耗。分别是碱和缺氧预处理的6.9倍和17.9倍。在超声波预处理之前进行碱预处理可以减少超声波预处理的电耗。分别是碱和缺氧预处理的6.9倍和17.9倍。在超声波预处理之前进行碱预处理可以减少超声波预处理的电耗。
更新日期:2021-01-01
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