Mechanical harvest of massive harmful algal blooms is an effective measure for bloom mitigation. Yet subsequent processing of the resulting water from algae water separation after the harvesting becomes a new problem since individual algal cells or small algal aggregates are still present in the water. Here, we proposed a novel approach for effectively flocculating the cyanobacteria Microcystis aeruginosa with a removal efficiency of 97% in 6 h using hydrolyzed urine. Nitrogen and phosphorus were simultaneously reclaimed through struvite formation. The addition of Mg²⁺ promoted the flocculation efficiency and nutrient removal as well as the yield of struvite. Ca²⁺ could enhance the flocculation efficiency by forming calcium phosphate. During the flocculation process, no significant damage in algal cells was observed. This study provides a novel and sustainable potential for subsequent processing of the resulting water after algae water separation with simultaneous nutrient precipitation and reducing nutrient loads to wastewater treatment plants.

机械收获大量有害藻类水华是缓解水华的有效措施。由于在水中仍然存在单个藻类细胞或小的藻类聚集体，因此收获后藻类水分离所产生的水的后续处理成为一个新问题。在这里，我们提出了一种新方法，可以有效地絮凝铜绿微囊藻，使用水解尿液在6小时内的去除效率为97％。通过鸟粪石形成同时回收氮和磷。Mg ^2+的添加促进了絮凝效率和营养去除以及鸟粪石的产量。钙²⁺通过形成磷酸钙可以提高絮凝效率。在絮凝过程中，未观察到藻类细胞的明显破坏。这项研究为藻类水分离后所产生的水的后续处理提供了新颖且可持续的潜力，同时养分沉淀并减少了污水处理厂的养分负荷。