Ultrasound techniques have gained increased interest in environmental remediation because of their promising performance and reagent-free nature. This study investigated the effects of ultrasound-coagulation on Microcystis aeruginosa removal, disinfection by-product (DBP) formation during subsequent chlorination, and acute toxicity and DBP-associated toxicity variations in chlorinated effluents. Compared with coagulation using polymeric aluminum chloride (5 mg-Al/L) alone, ultrasound-coagulation showed significantly enhanced turbidity removal, with the removal ratio increasing from 51% to 87% ∼ 96%. Although the addition of ultrasound may not substantially improve and even deteriorate the coagulation removal of DOC following the leakage of intracellular organic matter, the significantly improved DBP control was achieved as the cells dominated DBP formation. With the addition of ultrasound, the chlorine demand, aggregate DBP concentration and total organic halogen concentration reductions in the chlorinated M. aeruginosa solution increased from 15%, 47% and 52% (coagulation alone), respectively, to 56% ∼ 78%, 56% ∼ 80% and 68% ∼ 89%. The enhanced DBP mitigation was mainly attributed to the enhanced algal removal. Similarly, the acute toxicity and DBP-associated toxicity of chlorinated effluents further decreased from 100% and 0.0092 (coagulation alone) to 30% ∼ 88% and 0.0029 ∼ 0.0060. Therefore, ultrasound-enhanced coagulation is a promising strategy for urgent algal removal, DBP mitigation and toxicity abatement.

超声技术由于其有前途的性能和无试剂性质，在环境修复中越来越受到关注。本研究调查了超声凝固对铜绿微囊藻的影响去除、随后氯化过程中消毒副产物 (DBP) 的形成，以及氯化废水中的急性毒性和 DBP 相关毒性变化。与单独使用聚合氯化铝 (5 mg-Al/L) 混凝相比，超声混凝显着提高了浊度去除率，去除率从 51% 增加到 87% ~ 96%。尽管在细胞内有机物泄漏后超声的加入可能不会显着改善甚至恶化 DOC 的凝固去除，但由于细胞主导 DBP 形成，因此显着改善了 DBP 控制。添加超声波后，氯化铜绿假单胞菌中的氯需求、总 DBP 浓度和总有机卤素浓度降低溶液分别从 15%、47% 和 52%（仅凝结）增加到 56% ∼ 78%、56% ∼ 80% 和 68% ∼ 89%。增强的 DBP 缓解主要归因于增强的藻类去除。同样，氯化废水的急性毒性和 DBP 相关毒性进一步从 100% 和 0.0092（仅混凝）降低到 30% ～ 88% 和 0.0029 ～ 0.0060。因此，超声增强凝固是紧急去除藻类、缓解 DBP 和降低毒性的一种有前景的策略。