Flocculation–Dewatering Behavior of Microalgae at Different Growth Stages under Inorganic Polymeric Flocculant Treatment: The Relationships between Algal Organic Matter and Floc Dewaterability,ACS Sustainable Chemistry & Engineering

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Flocculation–Dewatering Behavior of Microalgae at Different Growth Stages under Inorganic Polymeric Flocculant Treatment: The Relationships between Algal Organic Matter and Floc Dewaterability
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1021/acssuschemeng.8b02551
Weijun Zhang ₁ , Qingwei Cao ₁ , Guangling Xu ₁ , Dongsheng Wang _{2,

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Affiliation

An algal bloom is a naturally occurring phenomenon in freshwaters due to discharge of wastewater containing nitrogen and phosphate. Coagulation-flocculation was widely used in removal of cyanobacteria and algae organic matter (AOM) from water. Microalgae and AOM differ greatly in physiochemical properties at different growth stages, which are likely to have important effects on their coagulation behavior. In this study, the interacting mechanisms between polymeric aluminum chloride (PACl) and microalgae cells and AOM at the different growth stages were investigated by characterizing morphology and AOM properties of microalgae flocs formed from PACl treatment. The results showed that PACl coagulation exhibited better removal efficiency for the microalgae cells and AOM in exponential and stationary phase than that in decline phase. The protein and humic acid content in loose bound AOM (LB-AOM) were found to be key constituents affecting floc dewatering behavior, and complexation adsorption of hydrolyzed products for proteins and humic substances in LB-AOM was responsible for microalgae floc dewatering improvement. These results provide a novel insight into optimization of flocculation and dewatering of cyanobacteria at different growth stages with PACl treatment.

中文翻译：

无机高分子絮凝剂处理下不同生长阶段微藻的絮凝-脱水行为：藻类有机物与絮凝物脱水能力的关系

藻华是由于排放含氮和磷酸盐的废水而在淡水中自然发生的现象。混凝-絮凝被广泛用于去除水中的蓝细菌和藻类有机物（AOM）。在不同的生长阶段，微藻和AOM的理化性质差异很大，这可能对其凝结行为产生重要影响。在这项研究中，通过表征由PACl处理形成的微藻絮凝物的形态和AOM特性，研究了聚合氯化铝（PACl）与微藻细胞和AOM在不同生长阶段之间的相互作用机理。结果表明，PACl混凝在指数期和固定期对微藻细胞和AOM的去除效果均好于下降期。发现松散结合的AOM（LB-AOM）中的蛋白质和腐殖酸含量是影响絮凝物脱水行为的关键成分，并且LB-AOM中水解产物对蛋白质和腐殖质的络合吸附是微藻絮凝物脱水改善的原因。这些结果为使用PAC1处理不同生长阶段的蓝藻絮凝和脱水优化提供了新的见解。

更新日期：2018-06-28

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