다환방향족 탄화수소(PAHs) 오염토양의 과황산 산화 시 철 활성화제의 영향 (Effect of Iron Activators on the Persulfate Oxidation of Polycyclic Aromatic Hydrocarbons (PAHs) in Contaminated Soils)

서지정보

· 발행기관 : 한국지하수토양환경학회
· 수록지 정보 : 지하수토양환경 / 25권 / 1호 / 62 ~ 73페이지
· 저자명 : 최지연, 박정도, 신원식

초록

PAHs commonly found in industrial sites such as manufactured gas plants (MGP) are potentially toxic, mutagenic andcarcinogenic, and thus require immediate remediation. In-situ chemical oxidation (ISCO) is known as a highly efficienttechnology for soil and groundwater remediation. Among the several types of oxidants utilized in ISCO, persulfate hasgained significant attention in recent years. Peroxydisulfate ion (S2O82−) is a strong oxidant with very high redox potential(E0 = 2.01 V). When mixed with Fe2+, it is capable of forming the sulfate radical (SO4−·) that has an even higher redoxpotential (E0 = 2.6 V). In this study, the influence of various iron activators on the persulfate oxidation of PAHs incontaminated soils was investigated. Several iron sources such as ferrous sulfate (FeSO4), ferrous sulfide (FeS) and zerovalentiron (Fe(0)) were tested as a persulfate activator. Acenaphthene (ANE), dibenzofuran (DBF) and fluorene (FLE)were selected as model compounds because they were the dominant PAHs found in the field-contaminated soil collectedfrom a MGP site. Oxidation kinetics of these PAHs in an artificially contaminated soil and the PAH-contaminated fieldsoil were investigated. For all soils, Fe(0) was the most effective iron activator. The maximum PAHs removal rate inFe(0)-mediated reactions was 92.7% for ANE, 83.0% for FLE, and 59.3% for DBF in the artificially contaminated soil,while the removal rate of total PAHs was 72.7% in the field-contaminated soil. To promote the iron activator effect, theeffects of hydroxylamine as a reducing agent on reduction of Fe3+ to Fe2+, and EDTA and pyrophosphate as chelatingagents on iron stabilization in persulfate oxidation were also investigated. As hydroxylamine and chelating agents (EDTA,pyrophosphate) dosage increased, the individual PAH removal rate in the artificially contaminated soil and the total PAHsremoval rate in the field-contaminated soil increased.

영어초록

PAHs commonly found in industrial sites such as manufactured gas plants (MGP) are potentially toxic, mutagenic andcarcinogenic, and thus require immediate remediation. In-situ chemical oxidation (ISCO) is known as a highly efficienttechnology for soil and groundwater remediation. Among the several types of oxidants utilized in ISCO, persulfate hasgained significant attention in recent years. Peroxydisulfate ion (S2O82−) is a strong oxidant with very high redox potential(E0 = 2.01 V). When mixed with Fe2+, it is capable of forming the sulfate radical (SO4−·) that has an even higher redoxpotential (E0 = 2.6 V). In this study, the influence of various iron activators on the persulfate oxidation of PAHs incontaminated soils was investigated. Several iron sources such as ferrous sulfate (FeSO4), ferrous sulfide (FeS) and zerovalentiron (Fe(0)) were tested as a persulfate activator. Acenaphthene (ANE), dibenzofuran (DBF) and fluorene (FLE)were selected as model compounds because they were the dominant PAHs found in the field-contaminated soil collectedfrom a MGP site. Oxidation kinetics of these PAHs in an artificially contaminated soil and the PAH-contaminated fieldsoil were investigated. For all soils, Fe(0) was the most effective iron activator. The maximum PAHs removal rate inFe(0)-mediated reactions was 92.7% for ANE, 83.0% for FLE, and 59.3% for DBF in the artificially contaminated soil,while the removal rate of total PAHs was 72.7% in the field-contaminated soil. To promote the iron activator effect, theeffects of hydroxylamine as a reducing agent on reduction of Fe3+ to Fe2+, and EDTA and pyrophosphate as chelatingagents on iron stabilization in persulfate oxidation were also investigated. As hydroxylamine and chelating agents (EDTA,pyrophosphate) dosage increased, the individual PAH removal rate in the artificially contaminated soil and the total PAHsremoval rate in the field-contaminated soil increased.

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