臭氧微纳米气泡氧化与粉末活性炭吸附联合工艺去除饮用水中嗅味物质OA

Aiming at the low removal efficiency of conventional processes for algal-derived taste and odor compounds(2-methylisoborneol,2-MIB and geosmin,GSM)and algal pollution in drinking water sources,this study systematically investigated the removal efficiencies of ozone micro-nano bubbles(O3-MNBs)oxidation and powdered activated carbon adsorption,both individually and in combination,for 2-MIB,GSM,and algal cells in drinking water source water.The results showed that O3-MNBs pre-oxidation of raw drinking water source water efficiently degraded taste and odor compounds(removal rate>97.5%at 400 ng·L-1)and damaged algal cells(removal rate of 67.2%in 30 min).When used as an advanced treatment stage,the degradation rate constant(k)was 10.1%to 25.6%faster than in the pre-oxidation process due to lower background matrix interference.In both cases,using O3-MNBs as either pre-oxidation or advanced treatment reduced the effluent concentrations of both 2-MIB and GSM below 10 ng·L-1,and the oxidation processes followed pseudo-first-order kinetics(R2>0.95).Furthermore,the adsorption of 2-MIB and GSM by powdered activated carbon followed pseudo-second-order kinetics(R2>0.99).The equilibrium adsorption capacity for GSM was approximately 20.0%higher than that for 2-MIB,and the adsorption capacity in pure water systems increased by over 10.0%compared to that in raw water.Based on kinetic models,a quantitative prediction method for the O3-MNBs oxidation and powdered activated carbon adsorption processes were established,aiming to achieve efficient removal of taste and odor compounds and cost optimization,thereby providing theoretical support for advanced drinking water purification and the construction of intelligent water treatment plants.