电化学体系下精准曝气对乳化油废水破乳机制研究

Study on emulsification mechanism of emulsified oil wastewater by precise aeration under electrochemical system

电化学体系下曝气对乳化油废水破乳除油具有显著效果,为响应国家“碳中和”政策号召,提出“精准曝气”概念,基于三相三维电极反应工艺,设计了针对曝气条件优化的试验,并进行能耗分析。试验结果表明,曝气强度缩减至1.5 L/min,曝气时间由90 min减少到60 min时,乳化油废水的COD和含油量分别为101 mg/L、4.98 mg/L,满足回注水标准,且达到了降低能耗的目的。利用COMSOL软件模拟乳化油滴聚集过程,探究破乳机制。在电场和气场作用下,加速削弱了油滴水油界面机械强度,促进了乳化油滴破乳、聚结、上浮去除的进程。

Aeration under electrochemical system has significant effect on emulsification and oil removal of emulsified oil wastewater,in response to the national“carbon neutral”policy,the concept of“precise aeration”was proposed,based on the three-phase three-dimensional electrode reaction process,the experiments for the optimization of the aeration conditions were designed,and the energy consumption analysis was carried out.Based on the three-phase three-dimensional electrode reaction process,an experiment was designed to optimize the aeration conditions and analyze energy consumption.The experimental results show that when the aeration intensity is reduced to 1.5 L/min and the aeration time is reduced from 90 min to 60 min,the COD and oil content of the emulsified oil wastewater are 101 mg/L and 4.98 mg/L respectively,which meets the standard of re-injection water and achieves the purpose of reducing energy consumption.COMSOL software was used to simulate the aggregation process of emulsified oil droplets to investigate the emulsion breaking mechanism.Under the action of electric field and air field,the mechanical strength of the water-oil interface of oil droplets was weakened,which promoted the process of emulsification,aggregation and uplift removal of emulsified oil droplets.