科研之友
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摘要
Aged landfill leachate was hardly degraded by traditional water treatment due to its highly complex composition and low biodegradability. There are few systematic evaluations on the landfill leachate treatment by ozone-based advanced oxidation processes (O3-based AOPs). This study investigated the feasibility of aged landfill leachate treated by O3/PS (peroxydisulfate, S2O2-8), O3/PMS (peroxymonosulfate, HSO-5) and O3/H2O2 systems based on treatment efficiency and energy efficiency under different initial pH, temperature, O3, Na2S2O8, KHSO5 or H2O2 dosages. The results showed that the EE/O (electrical energy per order) of O3/PS, O3/PMS and O3/H2O2 systems were 662.6, 1 007.5 and 1 233.7 kWh·m?3, respectively, under the optimum conditions. The treatment efficiency of O3/PMS systems was similar to O3/H2O2 and was higher than O3/PS systems. In consideration of treatment efficiency and energy consumption, the optimum treatment was observed with the O3/H2O2 systems at 25 ℃, initial pH of 6.0, O3 dosage of 3 g·h?1, H2O2 dosage of 2 125 mg·L?1 and reaction time of 60 min, the EE/O was reduced to 443.9 kWh·m?3. The removal efficiency of total organic carbon (TOC) and the reaction rate constant were 27.1% and 0.005 3 min?1, respectively. And the BOD5/COD value also increased from 0.18 to 0.26. The analysis showed that O3-based AOPs were energy-intensive, the combination of catalytic ozonation and low-cost biological treatment technologies might achieve efficient and economic degradation of pollutants. This study can be considered as a reference for the engineering application of O3-based AOPs.
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