서지주요정보
고급산화법과 생물막을 이용한 염소계 유기용제 폐수처리 = Treatment of chlorinated organic solvent wastewater by advanced oxidation and biofilm
서명 / 저자 고급산화법과 생물막을 이용한 염소계 유기용제 폐수처리 = Treatment of chlorinated organic solvent wastewater by advanced oxidation and biofilm / 임재림.
저자명 임재림 ; Lim, Jae-Lim
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8006955

소장위치/청구기호

학술문화관(문화관) 보존서고

DCE 96006

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Chlorinated hydrocarbons such as trichloroethylene(TCE), tetrachloro ethylene (PCE) are critical pollutants because of their toxic property and widespread occurrence in soil, air, and water. These compounds tend to resist biological degradation in conventional biological wastewater treatment system as well as in natural ecosystem. Recently, cometabolic conversions of several chlorinated aliphatics have been found successful under aerobic conditions. Also, advanced oxidation processes(AOPs) have been found effective in the destruction of refractory organic pollutants due to effective oxidation potential of hydroxyl radicals. In this study, the removal efficiencies of TCE by advanced oxidation processes(AOPs) as well as the cometabolic degradation of TCE by a biofilm process were investigated for the development of combined treatment process of physico-chemical and biological technologies in laboratory- and pilot-scale experiments. In ozonation, TCE was removed by a pseudo first-order reaction. The rate of TCE removal increased with the increase of pH up to critical value. In the PEROXONE($O_3/H_2O_2$) AOP, TCE was removed most effectively at peroxide-to- ozone dosage ratio of 0.8. The mineralization of TCE was made faster by continuous injection of peroxide than by batch injection. Unlike ozonation, the rate of TCE removal was the highest at the neutral pH condition. In $O_3$/UV AOP, the utilization efficiency of ozone and the removal efficiency of TCE increased with increasing UV intensity. About 40\% of TCE was photolyzed directly by the UV irradiation. In $H_2O_2$/UV AOP, the removal rate of TCE increased in proportion to the $H_2O_2$ concentration up to 45 ppm at UV intensity of 5 W/L. Destruction of TCE was better at an acidic pH condition than neutral or basic conditions. The PEROXONE process appeared most effective in degrading concentrated TCE among various AOPs studied in lab-scale. To evaluate the feasibility of cometabolic degradation of TCE by mixed microbial culture, three packed-bed bioreactors filled with GAC, Celite, and Ceramic beads respectively were operated for 285 days. Phenol-oxidizing microorganisms were immobilised effectively in the bioreactors which degraded TCE cometabolically utilizing phenol as a carbon and energy source. However phenol degradation was inhibited significantly when TCE concentration increased. In same manner, high phenol concentration over 50 mg/L inhibited TCE degradation in both the Celite and Ceramic bead bioreactors. When influent phenol was reduced to 50 ppm, 4 ppm of TCE was degraded effectively in both reactors. However, due probably to a large adsorption capacity of GAC, both TCE and phenol were removed most effectively in the GAC reactor, degrading over 85% of 9 ppm TCE and 87% of 50 ppm phenol. The activities of toluene dioxygenase, catechol-1,2-dioxygenase(C12O), and catechol-2,3-dioxygenase (C23O) were observed in the cells isolated from the bioreactors. From the results of the enzyme assay, it was demonstrated that immobilised microorganisms adapted to phenol possessed enzymes that were known to be responsible for the degradation of TCE. In continuous operation of the packed-bed bioreactors for 285 days, the pretreated influent pretreated by PEROXONE AOP at pH 9 and 0.8 of $H_2O_2/O_3$ ratio was supplied to three bioreactors. As microorganisms were not inhibited by the oxidation intermediates of TCE and residual hydrogen peroxide, residual TCE of 4 ppm and 65 ppm phenol were degraded effectively in the Celite and the Ceramic bead bioreactors. In piolt-scale, the PEROXONE AOP and two packed-bed bioreactors filled respectively with GAC and Celite were operated continuously with the influent 60 ppm of TCE. The influent was pretreated by PEROXONE AOP to 4 and 8 ppm of TCE for the Celite and the GAC bioreactors, respectively, and 50 ppm of phenol was degraded simultaneously with no competitive inhibition, to discharge in acceptable concentration. Also, a biodegradable compounds including glucose could be removed effectively with out inhibiting degradation of TCE and phenol. In conclusions, the combined treatment process of PEROXONE AOP and a biofilm process could treat the chlorinated solvent wastewater effectively.

서지기타정보

서지기타정보
청구기호 {DCE 96006
형태사항 xiii, 175 p. : 삽도 ; 25 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Lim Lim
지도교수의 한글표기 : 신항식
지도교수의 영문표기 : Hang-Sik Shin
학위논문 학위논문(박사) - 한국과학기술원 : 토목공학과,
서지주기 참고문헌 : p. 165-174
주제 트리클로로에틸렌
고급산화법
동시대사
고정화
생물막
Trichloroethylene
Advanced oxidation process
Cometabolism
Immobilisation
Biofilm
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