Degradation of Trichloroethane and Dioxane Co-contamination Via a ZVI-Anaerobic Microbe Combined System

In consideration of the removal of common co-contamination of trichloroethane(TCA) and dioxane in the groundwater,a zero-valent iron (ZVI)-anaerobic sludge combined system in an upflow anaerobic sludge blanket (UASB) reactor was established.The degradation characteristics of the combined system for TCA and dioxane were studied.The degradation kinetics and bacterial diversity to explore the combined mechanism of degradation were analyzed.The results showed that the combined system improved the biodegradation rate of TCA and dioxane significantly with removal percentages of 97.5% and 92.0%,respectively,and the degradation of the dioxane-TCA complex was consistent with first-order reaction kinetics.Chloroethane (CA) was generated from TCA through reductive dechlorination of ZVI.The ZVI corrosion products and microbial community structure were studied to elucidate the combined mechanism.