This study constructs a novel CW-MFC system and innovatively introduces layered double metal hydroxide (LDH) materials to treat quinoline wastewater.The removal efficiency of quinoline is enhanced through electrode modification and filler optimization of LDH materials.The introduction of LDH material has achieved a breakthrough improvement.When the amount of filler added is 0.4-0.6 g/L,the degradation rate of pollutants in the first 48 hours of the system has been increased to 2.47 mg/(L·h),and the highest removal rates of COD,quinoline,and TN have reached 89.56%,94.98%,and 77.91%,respectively.The LDH material increased the system output voltage by 225% (from 40 mV to 130 mV),but the increase in pollutant removal (9%-12%) lagged behind the voltage change,revealing the nonlinear correlation mechanism between electricity generation and degradation in the bioelectrochemical system.A certain amount of LDH material in the electrode and filler can promote the degradation of quinoline wastewater by CW-MFC,and the best effect is achieved by adding 0.6 g/L to the filler.At the same time,it can be found that the addition of fillers 0.4 and 0.6 g/L of LDH material can significantly improve the degradation rate of the system in the first 48 hours.
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