• Title/Summary/Keyword: DEP

Search Result 2,469, Processing Time 0.029 seconds

Characterization of Diethyl Phthalate(DEP) Removal using Ozone, UV, and Ozone/UV Combined Processes (오존, UV, 오존/UV 혼합 공정을 이용한 Diethyl Phthalate(DEP)의 제거특성 연구)

  • Jung, Yeon-Jung;Oh, Byung-Soo;Kang, Joon-Wun
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.28 no.2
    • /
    • pp.137-143
    • /
    • 2006

  • Three candidate processes(ozone alone, UV alone and ozone/UV combined processes) were evaluated for the removal of diethyl phthalate(DEP). Of the candidates, the ozone/UV process showed the highest removal efficiency of DEP. To elucidate a major oxidant for DEP oxidation in the ozone/UV process, the effects of pH and hydroxyl radical($OH^{\circ}$) scavenger were investigated. As a result, it was found that $OH^{\circ}$ plays a important role for DEP elimination. Meanwhile, the direct reaction between ozone and DEP was negligible. Observing the pseudo first-order rate of DEP removal in ozone alone and ozone/UV processes, the different pattern was obtained from two processes. The ozone/UV process was well plotted following the pseudo first-order. but in the ozone alone process the rate was divided into fast and slow phases. DEP degradation characteristics in ozone alone and ozone/UV was also investigated by observing the HPLC spectrum. We detected unknown compounds that were guessed to DEP byproducts and observed the formation and disappearance of the unknown compounds according to reaction time. Observing of high removal of TOC in ozone/UV combined process, it was found that DEP and DEP byproducts are completely oxidized by ozone/UV combined process.

  • PDF KSCI