• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2001.09a
• /
• pp.160-163
• /
• 2001

본 연구에서는 Fe$^{0}$ /$H_2O$$_2$ 시스템을 이용하여 디젤 오염토양의 산화처리효율과 경제성 향상을 위한 실험을 수행하였다. 앞선 연구결과에서 최적 pH조건은 3이었으며, 과산화수소와 철 분말의 양은 비례적으로 증가할수록 처리효율이 높게 나타났다. 1) 이번 연구에서는 pH조절에 따른 처리효율의 향상효과를 알아보기 위해 pH 값을 3으로 일정하게 유지하여 반응을 수행하였으며, 일정 철 분말 농도조건에서 과산화수소의 주입방법에 따른 반응변화를 살펴보기 위해 과산화수소를 여러 비율로 분할 주입하면서 실험을 실시하였다. 본 연구결과에 따르면 pH를 3으로 일정하게 유지함으로써 초기에만 pH를 3으로 조정한 이전의 연구에서 반응이 경과함에 따라 나타나는 pH상승에 따른 처리효율의 감소 효과를 줄며 전체적인 TPH 처리효율을 10%이상 높일 수 있었으며, 같은 양의 TPH 제거에 소모되는 과산화수소의 양을 20% 정도 줄일 수 있었다. 과산화수소의 분할주입에 따른 반응향상효과 실험에서는 5회에 걸쳐 분할 주입한 경우에 3시간 이후 경미한 반응성 향상효과를 얻을 수 있었다. 이러한 결과는 과산화수소를 분할하여 주입함으로써 한번에 주입한 경우에 비하여 유기물의 산화에 직접적으로 참여하지 않는 과산화수소의 scavenging 효과를 최소화할 수 있음을 보여주는 것이다. 따라서 최적 pH의 일정 유지와 과산화수소의 분할주입으로 철 분말을 이용한 펜톤유사반응의 처리효율과 경제성 제고 모두에 있어서 효과가 있음을 알 수 있었다.

• Journal of Korean Society of Water and Wastewater
• /
• v.26 no.6
• /
• pp.779-786
• /
• 2012

The degradation of 2-chlorophenol(2-CP) by various AOPs(Advanced Oxidation Processes) including the photo-Fenton process has been examined. In sole $Fe^{2+}$, UV or $H_2O_2$ process without combination, low removal efficiencies have been achieved. But the photo-Fenton process showed higher removal efficiency for degradation of 2-chlorophenol than those of other AOPs including the Fenton process and the UV processes. In the photo-Fenton process, the optimal experimental conditions of 2-chlorophenol degradation were obtained at pH 3 and the $Fe^{2+}/H_2O_2$molar ratio of 1. Also the 2-chlorophenol removal efficiency increased with decreasing of the initial 2-chlorophenol concentration. 3-chlorocatechol and chlorohydroquinone were identified as photo-Fenton reaction intermediates, and a degradation pathway of 2-chlorophenol in the aqueous phase during the photo-Fenton reaction was proposed.

• Journal of the Korean GEO-environmental Society
• /
• v.11 no.10
• /
• pp.49-55
• /
• 2010

The oil spill occurred frequently due to probably the increased consumption of oil as the energy source and the raw materials of various chemicals. For the treatment of oil contaminated groundwater, DAF(Dissolved Air Flotation) is being used but the removal efficiency is low. Therefore it is necessary to reduce the free phase oil, oil-in water type or water-in oil type emulsified oil, and soluble oil which are the main sources of contaminated groundwater. In this study, treatment of contaminated groundwater was performed using the Fenton oxidation process. The optimum conditions for the removal of THP(Total Petroleum Hydrocarbon) were 3 of pH, 25mM of $H_2O_2$ concentration and 25mM of $Fe^{2+}$ concentration. THP and COD(Chemical Oxygen Demand) concentrations decreased less than 1.5mg/L and 40.0mg/L in 7 minutes using DAF and Fenton oxidation process. However it is necessary to install the settling basin as the sludge concentration increased approximately 5 times.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.13 no.4
• /
• pp.107-117
• /
• 2005

The objective of this study was to investigate the proper operation conditions of fenton oxidation such as initial pH, $H_2O_2/Fe^{2+}$ ratio, $H_2O_2/Fe^{2+}$ dosage amount, and neutralizing agent for pretreatment of the livestock wastewater. Fenton oxidation reagents were reacted with the livestock wastewater for 2 hours at 120 rpm and the settling was performed for 2 hours using jar-tester apparatus under the different experimental conditions. And then the supernatant was sampled and measured for the residual $H_2O_2$, $COD_{Cr}$, and SS. The results are as follows; optimum initial pH=4, optimum $H_2O_2/Fe^{2+}$ ratio=10:1, optimum $H_2O_2/Fe^{2+}$ dosage amount=5,000/500 mg/L and $Ca(OH)_2$ as proper neutralizing agent. The removal efficiency of $COD_{Cr}$ and SS were 43% and 84% under those optimal fenton oxidation conditions.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2016.10a
• /
• pp.216-216
• /
• 2016

• Journal of Korean Society of Environmental Engineers
• /
• v.28 no.3
• /
• pp.257-264
• /
• 2006

This study investigated the effects of hybrid process(chemical coagulation, Fenton oxidation and ceramic UF(ultrafiltration)) on COD and color removals of commercial reactive dyestuffs. In the case of chemical coagulation, the optimal concentrations of $Fe^{3+}$ coagulant for COD and color removals of RB49(reactive blue 49) and RY84(reactive yellow 84) were determined according to the different coagulant dose at the optimal pH. They were 2.78 mM(pH 7) in RB49 and 1.85 mM(pH 6) in RY84, respectively. In the case of Fenton oxidation, the optimal concentrations of $Fe^{3+}\;and\;H_2O_2$ were obtained. Optimal $[Fe^{2+}]:[H_2O_2]$ molar ratio of COD and color removals of RB49 and RY84 were 4.41:5.73 mM and 1.15:0.81 mM, respectively. In the case of ceramic UF, the flux and rejection of supernatant after Fenton oxidation were investigated. After ceramic UF for 9 hr, the average flux of RB49 and RY84 solutions were $53.4L/m^2hr\;and\;67.4L/m^2hr$ at 1 bar, respectively. In addition, the permeate flux increased and the average flux recovery were 98.5-99.9%(RB49) and 91.0-97.3%(RY84) according to adopting off-line cleaning(5% $H_2SO_4$). Finally, COD and color removals were 91.6-95.7% and 99.8% by hybrid process, respectively.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2001.04a
• /
• pp.34-37
• /
• 2001

폐수처리분야에 널리 사용되어 온 펜톤산화반응을 응용한 Fe$^{\circ}$/$H_2O$$_2$시스템을 이용하여 고농도 유류오염 미세호양(100$\mu\textrm{m}$이하)의 화학적 산화처리 실험을 수행하였다. 반응은 100$m\ell$, 삼각프라스크에 오염토양(5g)과 반응시약을 주입한 후 자석교반기를 이용하여 회분 식으로 진행하였으며 일정 시간(0, 1, 2, 4, 8, 24hr)별로 TPH를 측정하였다. 그리고 각 조건별 시간에 따른 반응특성을 살펴보았다. 일반적으로 알려진 펜톤산화반응의 수요 반응조건인 초기 pH /$H_2O$$_2$ 및 Fe$^{\circ}$의 주입농도, 그리고 초기 디젤오염농도의 조건을 변화하며 각 조건별 처리효과를 알아보았다. 본 연구결과에서 최적 pH조건은 3인 것으로 나타났으며, 분말철(Fe$^{\circ}$)과 $H_2O$$_2$의 주입농도를 증가함에 따라 오염토양의 TPH 제거효율도 비례적으로 향상되었다. 초기오염농도에 따른 최종 처리효율은 큰 차이가 없었으나. 고농도 오염일수록 제거된 디젤의 총량은 크게 나타나. 본 논문에서 제시한 방법이 고농도 오염토양일수록 더 큰 효과를 얻을 수 있음을 보여주었다. 대부분의 반응이 반응개시 후 약 8시간 이내에 이루어졌는데, 반응에 수반되는 pH 상승과 그에 따른 반응성의 저감효과를 일정 pH 조절에 의해 감소시킴으로써 반응성의 향상을 좀 더 높일 수 있을 것으로 판단된다. 결론적으로, Fe$^{\circ}$/$H_2O$$_2$시스템을 이용한 화학적 산화처리방법은 경제성과 처리성능에서 고농도 유류오염 미세토양의 효율적인 처리방안으로서 향후 적용 가능성이 높을 것으로 기대된다.

• Journal of Soil and Groundwater Environment
• /
• v.7 no.1
• /
• pp.25-31
• /
• 2002

This study attempts to elucidate the possibility of treating landfill leachate by steelers' dust/${H_2}{O_2}$ system in a well-mixed batch reactor. Experiments were conducted to investigate the effects of operating variables such as pH, dust and ${H_2}{O_2}$ dosages and ${H_2}{O_2}$ injection method on the treatment efficiency, Contaminant concentrations were identified by TOC (Total Organic Carbon) analyzer. Experimental observations showed the possibility of steelers' dust as a catalytic reagent in the ${H_2}{O_2}$/dust system. The batch experiments showed that the optimal $H_2O$$_2$ and dust dosage, 20g/L dust. 2,000mg/L ${H_2}{O_2}$ removed about 75% of initial TOC concentration (250mg/1) within 60 min. And the TOC removal in the ${H_2}{O_2}$/dust system effectively proceeded only within a limited pH range of 3-4. The stealers' dust-catalyzed oxidative treatment of landfill leachate was more efficient compared with the $FeSO_2$catalyzed system (Fenton oxidation) for the removal rate and the cost.

• Journal of Environmental Health Sciences
• /
• v.33 no.2 s.95
• /
• pp.150-157
• /
• 2007

The chemical and photochemical decolorization of Rhodamine B (RhB) in water has been carried out by Fenton, Fenton-like and photo-Fenton-like process. The effect of applied $H_2O_2,\;Fe^{2+}$ dosage (Fenton process), $H_2O_2,\;Fe^{\circ}$ dosage (Fenton-like and photo-Fenton-like process), UV light power (photo-Fenton-like process) pH (all processes) have been studied. The results obtained showed that more than 98% of color removal was obtained for the RhB solutions in every process. However, Fenton-like process was not suitable for the color removal of RhB because Fenton-like process was required much more reagents than Fenton and photo-Fenton-like process. The Fenton and photo-Fenton-like process showed similar reagents need. Optimum pH for three processes in this study is about pH 3. The relative order of sensitivity for pH of each process was: Fenton-like > photo-Fenton-like > Fenton.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
• /
• 2000.05a
• /
• pp.145-148
• /
• 2000