Treatment of simulated wastewater containing Reactive Red 195 by zero-valent iron/activated carbon combined with microwave discharge electrodeless lamp/sodium hypochlorite

摘要

A comparative study of treatment of simulated wastewater containing Reactive Red 195 using zero-valent iron/activated carbon(ZVI/AC),microwave discharge electrodeless lamp/sodium hypochlorite(MDEL/NaClO) and the combination of ZVI/ACMDEL/NaClO was conducted.The preliminary results showed the two steps method of ZVI/AC-MDEL/NaClO had much higher degradation effciency than both single steps.The final color removal percentage was nearly up to 100% and the chemical oxygen demand reduction percentage was up to approximately 82%.The effects of operational parameters,including initial pH value of simulated wastewater,ZVI/AC ratio and particle size of ZVI were also investigated.In addition,from the discussion of synergistic effect between ZVI/AC and MEDL/NaClO,we found that in the ZVI/AC-MEDL/NaClO process,ZVI/AC could break the azo bond firstly and then MEDL/NaClO degraded the aromatic amine products effectively.Reversing the order would reduce the degradation effciency.