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首页> 外文期刊>Environmental Science & Technology >The impact of zeta potential on the physical properties of ferric-NOM flocs
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The impact of zeta potential on the physical properties of ferric-NOM flocs

机译：Zeta电位对NOM铁絮凝物物理性能的影响

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摘要

The physical properties of natural organic matter ( NOM) flocs, such as size, growth rate, and strength, were investigated using a laser diffraction particle sizing device. Conditions were set such that varying carbon coagulant ratio and zeta potential could both be investigated. Results demonstrated a link between zeta potential and coagulation and flocculation performance, with the production of strong flocs and low residual concentrations when the zeta potential was minimized. The overall strength of the connection points within the floc were determined by a combination of steric interactions, polymer bridging, van der Waals forces, and electrostatic forces. Hence, both dose ratio and zeta potential are important in understanding floc properties. Floc growth was dominated by dose ratio, whereas the response to elevated shear was strongly related to zeta potential. The steady-state floc size was a combination of both factors. This allowed the continued development of a qualitative model in order to engineer optimal floc properties when coagulating NOM.
机译：使用激光衍射粒度仪对天然有机物（NOM）絮凝物的物理性质（例如大小，生长速率和强度）进行了研究。设置条件，以便可以研究变化的碳凝固率和zeta电位。结果表明，zeta电位与凝结和絮凝性能之间存在联系，当zeta电位最小时，会产生强絮凝物和低残留浓度。絮状物内连接点的整体强度由空间相互作用，聚合物桥连，范德华力和静电力共同决定。因此，剂量比和ζ电势都对理解絮凝特性很重要。絮凝剂的生长主要受剂量比的影响，而对剪切力升高的响应与ζ电势密切相关。稳态絮体大小是两个因素的组合。这样可以继续开发定性模型，以便在凝结NOM时设计最佳絮凝性能。

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