펜톤산화에 의한 바이오매스 분해향상과 펜톤산화 용액 재사용 평가

정소연(So-Yeon Jeong),이재원(Jae-Won Lee) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.4

In this study, the reusability of the Fenton oxidation solution was evaluated to reduce the cost of the pretreatment process. Biomass was sequential subjected to Fenton oxidation-hydrothermal treatment and enzymatic hydrolysis to produce monosaccharides. The liquid solution recovered after Fenton oxidation contained OH radicals with a concentration of 0.11 mol/L. This liquid solution was reused for a new Fenton oxidation reaction. After Fenton oxidation, hydrothermal treatment was performed under the same conditions as before, and 9.34-13.63 g/L of xylose was detected. This concentration was slightly lower than that of a fresh Fenton oxidation solution (16.51 g/L) but was higher than that obtained by hydrothermal treatment without Fenton oxidation (2.72 g/L). The degradation rate during hydrothermal pretreatment involving Fenton oxidation was 36.02%, which decreased (29.24-31.05%) slightly when the liquid solution recovered after Fenton oxidation was reused. However, the degradation rate increased compared to that measured from hydrothermal treatment without Fenton oxidation (15.21%). Moreover, the yield after enzyme hydrolysis decreased in the following order: fresh Fenton oxidation-hydrothermal treatment (89.64%) > Fenton oxidation with reused solution-hydrothermal treatment (74.84%) > hydrothermal treatment without Fenton oxidation (32.05%).

영가철 펜톤 유사반응을 이용한 역삼투 공정 농축폐수의 유기물 제거

김유경 ( Yu-kyung Kim ),서인석 ( In-seok Seo ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.4

Application of reverse osmosis(RO) membranes is increasing due to the demand increase for the industrial water and sewage reuse recycling rate. However, it produces RO concentrate wastewater. RO concentrate is difficult to handle by conventional wastewater treatment because it contains a high concentration of non-biodegradable organics. So, it`s treatment acts as a bottleneck phenomenon of industrial water production. This study presents the Fenton-like oxidation using zero-valent iron(ZVI) as a way to handle the non-biodegradable organic material in the RO concentrate wastewater. Recently, ZVI has attention as alternative reducing agent in the way that it does not cause toxicity. The main objective of this research is to investigate the effects of a variety of factors such as pH, ZVI dose and reaction time for removal of organics in RO concentrate by Fenton-like oxidation with ZVI. All tests were proceeding under the three steps: Fenton-like oxidation, Neutralization and Sedimentation. The results show that the Fenton-like oxidation with ZVI was able to remove organics in RO concentrate. The optimal factors in Fenton-like oxidation were determined; pH 2 and 2 hours as reaction time. With this condition, the removal efficiency of chemical oxygen demand (COD) was about 37 percent at 500 mg/L as hydrogen peroxide and 750 mg/L as ZVI. Meanwhile, this study represents that the Fenton-like oxidation with ZVI has a lower organic removal efficiency than the Fenton`s oxidation. In order to achieve the same removal efficiency as Fenton`s oxidation, the Fenton-like oxidation with ZVI requires the use of more hydrogen peroxide.

Roles of Oxidation and Coagulation in Fenton Process for the Removal of Organics in Landfill Leachate

Yoon, Jeyong,Kim, Yoonki,Huh, Jin,Lee, Yunho,Lee, Dongsoo 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.5

High potential of coagulation to remove organics has not been fully recognized in Fenton process and coagulation has been used as an auxiliary process removing iron in effluent. This study evaluates the relative role of oxidation and coagulation step of Fenton process in the removing of biologically treated leachate organics of Metropolitan Landfill in Korea. This study showed that to the maximum, 30% of DOC and 40% of COD removal efficiencies were achieved by the Fenton oxidation step alone, whereas, 60% of DOC and 75% of COD removal efficiencies were achieved by the combined Fenton oxidation and subsequent Fenton coagulation step, as the same Fenton's reagent condition ([Fe^2+]_0 = 1250 or 2500 mg/L, and [H_20_2]_0 = 0~3000 mg/L) was applied in laboratory experiments. In addition, it was observed that the rapid decomposition of H_20_2 with time did not lead to the corresponding removal of leachate organics. This means that OH radical generated from the H_2O_2 decompostion is not effectively invoved in degrading the leachate organics, pointing out the possibility of uneconomical use of H_20_2 and unwarranted retention time of Fenton oxidatiom chamber in Fenton leachate treatment plant. Furthermore, the investigation of field Fenton process confirmed the observation of laboratory scale study, revealing that the DOC and COD removal effciencies in the Fenton oxidation step were less than 10~20% prior to the Fenton coagulation step, and major removals of DOC and COD (60~70%) were achieved after the finial Fenton coagulation step. These findings demonstrate the significance of the coagulation in Fenton process and raise a need for individual assessments of both oxidation and coagulation for the optimal design and evaluation of a whole Fenton processes. The individual assessments, however, should be conducted in an integrative manner because the preceding process (oxidation) may affect the performance the next process (coagulation).

Fenton 산화법에 의한 침출수중의 유기성 오염물 제거

정경민 ( Kyung-min Jung ),홍순강 ( Soon-kang Hong ) 한국환경기술학회 2005 한국환경기술학회지 Vol.6 No.3

본 연구는 침출수를 이용하여 Fenton 시약에 의한 산화분해 가능성을 조사하고 여러 반응 인자 즉 pH, H₂O₂의 주입량, Fe⁺² 의 주입량, 반응온도, 반응시간, 그리고 교반 방법 등이 처리효율에 미치는 영향을 고찰함으로써 Fenton 산화법이 매립지 침출수에 존재하는 유기성 오염물 처리를 위해 효율적으로 적용될 수 있도록 하는데 그 목적을 두었다. 매립지 침출수 중에 포함된 고농도의 난분해성 유기물을 생물학적 공정을 이용하여 제거하는 것은 매우 어렵기 때문에 Fenton산화반응을 이용해 난분해성 유기물을 제거하였다. 본 실험에 사용된 침출수의 CODcr 농도는 650∼800mg/L이었다. Fenton산화의 최적 pH는 3.5에서 H₂O₂/Fe⁺² 비를 2,500/3,500mg/L로 주입하는 것이 최적의 조건으로 나타났다. 약품 주입량을 증가시킴으로써 CODcr 및 색의 제거효율은 일반적으로 증가하였으나 Fe⁺²의 주입량이 어느 한계를 넘으면 처리효율은 오히려 감소하였으며, H₂O₂는 색의 제거와 Fe⁺²의 반응 시간에 큰 영향을 미쳤고, Fenton산화 반응은 30분 정도의 반응시간으로 반응이 완결되었다. Fenton 산화반응을 이용할 경우 침출원수의 CODcr의 제거율은 80∼85%의 범위이었고, H₂O₂ : Fe⁺² 비는 0.7로 나타났다. 온도는 23℃에서 효율이 가장 좋았으며 그 이상의 온도에서는 효율이 떨어지는 것으로 나타났다. Fenton 산화반응의 완결시간은 10∼30분이 소요되었으며, 최적 반응 시간은 30분으로 나타났다. The objectives of this work are to find the applicability of the Fenton oxidation process to the treatment of landfill leachate and to investigate the effects of reaction conditions such as pH, hydrogen peroxide dosage, ferrous sulfate dosage, reaction temperature, reaction time, and agitation methods on CODcr removal from landfill leachate. It is difficult to remove the high non-biodegradable organics using Fenton oxidation process. The Fenton oxidation was most efficient in the pH range of 3.5. Increasing the dosage of Fenton`s reagent improved the efficiency of CODcr and color removal, but excess dosage of ferrous sulfate over some level showed adversely lower treatment efficiency. Color removal was sensitive to the hydrogen peroxide dosage, while reaction time was sensitive to the ferrous sulfate dosage. The CODcr reduction ranged from 80% to 85%. The Fenton oxidation using Fe⁺² showed that the optimum condition were pH 3.5. H₂O₂ : Fe⁺² dosage of 2,500 : 3,500mg/L Since H₂O₂/Fe⁺² was estimated to be 0.7. The reaction times for the oxidation of leachate a were all less than thirty minutes.

Fenton-oxidation에 의한 MTBE(Methyl Tertiary Butyl Ether)처리시의 영향인자에 관한 연구

전은미,박석환,정문식 한국환경보건학회 1998 한국환경보건학회지 Vol.24 No.3

The treatment of soils and water contaminated with MTBE using the Fenton oxidation was investigated. The effects of dosage of $H_{2}O_{2}$, and Fe$^{2+}$ concentrations, and solution pH on transformation and mineralization in soil were evaluated. Generation of TBA and acetone following Fenton-oxidation of MTBE in water and generation of acetone following Fenton-oxidation of TBA were observed. Therefore TBA and acetone are degradation intermediates of MTBE. There was a large difference of treatment efficiency in Fenton oxidation of MTBE between soil and water system. This may be caused by the complex nature of soil, soil organic matter which can consumed OH $\cdot$ radicals, and interacting with inorganic-soil constituents. The pH of soil was observed to have a significant effect on the chemical oxidation efficient of MTBE in soil The data demonstrated that optimal pH range were pH 3~4 and around 6. The soil batch studies demonstrated that treatment efficiency of MTBE was enhanced by adding additional ferrous salts but Fenton-oxidation occurred in no additional iron which indicated that iron in soil can catalyze the Fenton-oxidation. The most effective parameter of Fentonoxidation was $H_{2}O_{2}$/Fe$^{2+}$ ratio which theocratical ratio is 0.5. The optimal range of this ratio was found to be 0.6~2.3. In evaluating effect of $H_{2}O_{2}$ dosage on treatment efficiency, the increase of $H_{2}O_{2}$ did not always lead to increase of decompositions of MTBE in soil. Fenton oxidation was effective in destroying MTBE in aqueous extracts of contaminated soil and water. Experimental data provided evidence that the Fenton oxidation can effectively remediate MTBE-contaminated water and soil.

펜톤 시약 투입 변화에 따른 염색폐수의 처리효율 향상에 관한 연구

이상호,문혜진,김유미 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1

This research was carried out to enhance the removal efficiencies of COD_Cr and color from dyeing wastewater by Fenton process, involving oxidation and coagulation. The experimental variables for this study include dosage division ratio of hydrogen peroxide and amount of Fenton's reagent. In the case of H_2O_2 divided dosage, 7:3 was more effective than 3:7 to remove COD_Cr and color. The results show than COD was mainly removed by Fenton coagulation, where the ferric ions are formed in the initial Fenton reaction. In contrast, color was removed by Fenton oxidation rather than Fenton coagulation. It was found out that overdose of Fenton's reagent has been applied in the "B" Treatment Plant. In spite of 20% reduction of the hydrogen peroxide dosage, effluents are satisfied with Discharged Water Quality Standards.

펜톤 산화법을 이용한 역삼투 농축폐수 내 유기물 제거

김유경 ( Yu-kyung Kim ),김지연 ( Jiyeon Kim ),서인석 ( Inseok Seo ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.5

The interest on reuse of wastewater has increased by lack of fresh water supply. Reverse osmosis (RO) process is one of the technology to reuse wastewater. It can be obtained high purity water from wastewater using the revese osmosis membrane. However, it also produces revese osmosis concentrate wastewater, including high levels of organic matter as the result of treatment. This study presents the Fenton`s oxidation treatment as a way to handle the revese osmosis concentrate wastewater. The main objective of this research is to investigate effects of various factors such as pH, hydrogen peroxide (H₂0₂) dose, iron sulfate dose (as ferrous iron, Fe<sup>2+</sup>) and reaction time for removal of organics in revese osmosis concentrate wastewater by using Fenton`s oxidation process. All tests were proceeding under the three steps: Fenton`s reaction, Neutralization and Sedimentation. The results show that the Fenton`s oxidation treatment was very effective in removing organics in revese osmosis concentrate wastewater. The optimum factors in Fenton`s oxidation process of RO concentrate wastewater were determined; pH 3, 500 mg/L as H₂0₂, 1000 mg/L as Fe<sup>2+</sup> and 30 minutes as reaction time. Under the optimum conditions, the removal efficiency of chemical oxygen demand (COD) was about 50 percent. Compared with the other processes, Fenton oxidation has a high removal efficiency of chemical oxygen demand. However, it generates a Fenton sludge and requires additional processing to remove them. Therefore, in order to apply the Fenton`s oxidation in the actual process, it is determined that require additional research on the Fenton sludge treatment.

Removal of metsulfuron methyl by Fenton reagent

Javeed Mohammed Abdul,Mahintha Kumar,Jaya Kandasamy,Saravanamuthu Vigneswaran 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1

The removal of metsulfuron methyl (MeS)—a sulfonyl urea herbicide from contaminated water was investigated by advanced oxidation process (AOP) using Fenton method. The optimum dose of Fenton reagent (Fe2+/H2O2) was 10 mg/L Fe2+ and 60 mg/L H2O2 for an initial MeS concentration ([MeS]0) range of 0–80 mg/L. The Fenton process was effective under pH 3. The degradation efficiency of MeS decreased by more than 70% at pH > 3 (pH 4.5 and 7). The initial Fe2+ concentration ([Fe2+]0) in the Fenton reagent affected the degradation efficiency, rate and kinetics. The degradation of MeS at optimum dose of Fenton reagent was more than 95% for [MeS] 0 of 0–40 mg/L and the degradation time was less than 30 min. The determination of residual MeS concentration after Fenton oxidation by UV spectrophotometry was affected by the interferences from Fenton reagent. The estimation of residual MeS concentration after Fenton oxidation by high pressure/performance liquid chromatograph (HPLC) was interference free and represented the actual concentration of MeS and does not include the by-products of Fenton oxidation. The degradation kinetics of MeS was modelled by second order reactions involving 8 rate constants. The two reaction constants directly involving MeS were fitted using the experimental data and the remaining constants were selected from previously reported values. The model fit for MeS and the subsequent prediction of H2O2 were found to be within experimental error tolerances.

소규모 염색공장 폐수의 특성 및 펜톤 산화를 이용한 처리 가능성 연구

고영림(Young Lim Kho),조준호(Jun Ho Cho),박석환(Seok Hwan Park),정문식(Moon Shik Zong) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.2

Dyehouse wastewater has many environmental problems with their high pollutant concentration and color. Wastewater of Small dyehouses in Seoul were sampled and analyzed the physicochemical characteristics and investigated the influence of various experimental parameters of Fenton oxidation, such as pH, feeding rate of H₂O₂ and FeSO₄, reaction time and temperature and measured the COD removal efficiency by Fenton oxidation. In the analysis of raw dyehouse wastewater, high correlationship was shown between the APHA apparent color and visible wavelength peak absorbance and between COD cone. and UV peak absorbance. Hydrogen peroxide was very important in the Fenton oxidation and feasible amount of hydrogen peroxide was 0.1 ~ 0.3 ml/l to the wastewater of low COD cone. and 0.3 ~ 0.5 ml/I to the high COD cone. Efficiency of COD removal by Fenton oxidation was highest in pH 3.5. The efficiency was not low in pH 7 and the possibility of oxidation in neutral pH was shown. At the high COD wastewater, the feasible amount of oxidants were determined to 0.5~1 ml/I H₂O₂, 1200 ml/l FeSO₄·7H₂O, and at the low COD wastewater 0.5 ml/l H₂O₂, 800 ml/l FeSO₄·7H₂O. As the remained COD cone. was high after Fenton Oxidation of the wastewater with high raw COD, additional treatment should be considered to emit treated water.

Role of sol with iron oxyhydroxide/sodium dodecyl sulfate composites on Fenton oxidation of sorbed phenanthrene in sand

Park, J.Y.,Kim, J.H. Academic Press 2013 Journal of environmental management Vol.126 No.-

In situ Fenton oxidation has been recently used to oxidize sorbed organic contaminants in soil. The objective of present contribution was to study the role of sodium dodecyl sulfate (SDS) as anionic surfactant and sol with iron oxyhydroxide/SDS for Fenton oxidation of sorbed phenanthrene in sand. The most effective experimental condition for phenanthrene oxidation was the Fenton-like reaction system with 0.35% H<SUB>2</SUB>O<SUB>2</SUB>, 30 mM SDS, and 4 mM FeCl<SUB>2</SUB>. The Fenton-like reactions under these experimental conditions resulted in the production and sustenance of a stable sol with iron oxyhydroxide/SDS composites over 24 h. The formation of iron oxyhydroxide/SDS composites resulted in stabilization of H<SUB>2</SUB>O<SUB>2</SUB>, and then the Fenton-like reactions were sustained over 24 h. Furthermore, the sol of iron oxyhydroxide/SDS composites gave suitable sites to sustain oxidations of dissolved phenanthrene over a prolonged reaction span, which is required for in situ chemical oxidation.