Removal of refractory organic compounds from bio-treated landfill leachate using a Fe0-H2O2-MoS2 process under continuous operation mode

Abstract

Fe0 and MoS2 can synergistically activate H2O2 to generate free radicals for the removal of refractory organic compounds. This study aims to evaluate the Fe0-H2O2-MoS2 process for the removal of refractory organic compounds from bio-treated landfill leachate (BTL) under continuous operation mode. The results show that the dosage of H2O2, Fe0 and MoS2 all affect the removal effect of the Fe0-H2O2-MoS2 process on refractory organics during continuous operation. The removal rates of total organic carbon, absorbance at 254 nm and chroma at an initial pH of 3, [H2O2] of 5 mM, Fe0 of 0.4 g/L, MoS2 of 0.4 g/L and reaction time of 60 min were 65.83%, 85.11% and 93.14%, respectively. The Fe0-H2O2-MoS2 process can not only effectively destroy the complex structure of refractory organic compounds in the BTL treatment but also reduce the biological toxicity of BTL to a certain extent. In addition, a high organic removal rate can still be maintained during the long-term dynamic reaction process. Therefore, the Fe0-H2O2-MoS2 process has excellent performance in removing refractory organic compounds from BTL under continuous operation conditions.