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− The effect of in-organic chelating agents with Fe(II) and Fe(III) in modified Fenton was evaluated to degradation BTEX (benzene, toluene, ethylbenzene, xylene). Citric acid and pyrophosphate were used in experimentals and an optimum chelating agent for BTEX degradation was determined. In H 2 O 2 /Fe(III)/citric acid, degradation of BTEX was decreased when concentration of citric acid was increased. In H 2 O 2 /Fe(III)/pyrophosphate, degradation of BTEX was increased when concentration of pyrophosphate was increased and degradation for BTEX was relatively high compared with H 2 O 2 /Fe(III)/citric acid. In H 2 O 2 /Fe(II)/chelating agents, degradation for BTEX was high and pH variation was minimized when molar ratio of Fe(II) and citric acid was 1:1. Optimum molar concentration of Fe(II), citric acid and H 2 O 2 were 7 mM, 7mM and 500 mM for degradation of 100 mg/L of benzene to obtain best efficiency of H 2 O 2 , least precipitation of iron and best degradation.

BTEX-contaminated Groundwater Remediation with Modified Fenton Reaction using Environmental Friendly Chelating Agent