Mimicking biological method with inorganic and organic compounds modified clays for continuous controlling of Microcystis aeruginosa

IF 6.7 2区 环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
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引用次数: 0

Abstract

Although clay dispersion is one of the few techniques currently used in the field to control cyanobacterial harmful algal blooms (CyanoHABs), low flocculation efficiency and resuspension of flocculated algal cells are its main drawbacks. This study simulated the "flocculatio-lysis-degradation-nutrient regulation" model of biocontrol technique to develop a modified clay (ECRE-CS-PFS-CPL) using polyferric sulfate (PFS), chitosan (CS) and Eichhornia crassipes root extracts (ECRE) to modify the clinoptilolite (CPL). The results revealed that ECRE-CS-PFS-CPL introduced functional groups, specifically aldehyde group —CHO and amide group —CO-NH—, leading to an enhanced void structure. At 0.2 g/L concentration, ECRE-CS-PFS-CPL demonstrated a removal efficiency of 98.02 % within 30 min. ECRE-CS-PFS-CPL exhibited a positive charge in nature water, leveraging charge neutralisation to expedite the flocculation of M. aeruginosa cells. The combination of coated CS and algal cells resulted in the formation of large, dense flocs through net sweeping and bridging, which was 58.28 times larger than control. Subsequently, the loaded ECRE inhibited the algal cells via allelopathy. The inhibition activated the antioxidant system of M. aeruginosa, with significant increases in catalase (CAT) and superoxide dismutase (SOD) activities. Photosynthetic pigments (Chl-a), photosynthetic efficiency (Fv/Fm) and maximum relative photosynthetic electron transfer rate (ETRmax) were markedly reduced, indicating the damage to photosynthetic system. Furthermore, Chl-a remained consistently low during extended monitoring, registering at 4.98 % of control after 40 days. ECRE-CS-PFS-CPL effectively reduced microcystins by 81.48 % and phosphate levels in algal cultures by 91.92 % compared to control. Consequently, ECRE-CS-PFS-CPL offers an efficient, environmentally safe and sustainable solution for CyanoHABs control.

利用无机和有机化合物改性粘土模拟生物方法持续控制铜绿微囊藻
尽管粘土分散技术是目前在现场用于控制蓝藻有害藻华(CyanoHABs)的少数技术之一,但其主要缺点是絮凝效率低和絮凝藻细胞再悬浮。本研究模拟生物控制技术的 "絮凝-水解-降解-营养调节 "模型,利用聚硫酸铁(PFS)、壳聚糖(CS)和蟋蟀根提取物(ECRE)对clinoptilolite(CPL)进行改性,开发出一种改性粘土(ECRE-CS-PFS-CPL)。结果表明,ECRE-CS-PFS-CPL 引入了官能团,特别是醛基 -CHO 和酰胺基 -CO-NH-,从而增强了空隙结构。在 0.2 g/L 的浓度下,ECRE-CS-PFS-CPL 在 30 分钟内的去除率为 98.02%。ECRE-CS-PFS-CPL 在自然水体中呈现正电荷,利用电荷中和加速了铜绿微囊藻细胞的絮凝。涂布 CS 与藻细胞的结合通过网扫和架桥作用形成了大而致密的絮团,其体积是对照组的 58.28 倍。随后,负载的 ECRE 通过等位效应抑制了藻类细胞。抑制作用激活了铜绿微囊藻的抗氧化系统,使过氧化氢酶(CAT)和超氧化物歧化酶(SOD)的活性显著提高。光合色素(Chl-a)、光合效率(Fv/Fm)和最大相对光合电子传递速率(ETRmax)明显降低,表明光合系统受到破坏。此外,在长期监测过程中,Chl-a 始终保持在较低水平,40 天后为对照组的 4.98%。与对照组相比,ECRE-CS-PFS-CPL 有效地减少了 81.48 % 的微囊藻毒素,藻类培养物中的磷酸盐含量减少了 91.92 %。因此,ECRE-CS-PFS-CPL 为控制藻华提供了一种高效、环境安全和可持续的解决方案。
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来源期刊
Environmental Technology & Innovation
Environmental Technology & Innovation Environmental Science-General Environmental Science
CiteScore
14.00
自引率
4.20%
发文量
435
审稿时长
74 days
期刊介绍: Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.
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