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Currently, the ozone (O3) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O3 oxidation efficiency, hydrogen peroxide (H2O2) is used to cause a H2O2/O3 process. In H2O2/O3 process experiments, a previously optimized pH of 11 and applied O3 dose of 50 mg L−1 were used and the H2O2/O3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H2O2/O3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H2O2/O3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H2O2/O3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.
Hyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce. Sustainability 2018, 10, 2929 .
AMA StyleHyun-Hee Jang, Gyu-Tae Seo, Dae-Woon Jeong. Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce. Sustainability. 2018; 10 (8):2929.
Chicago/Turabian StyleHyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. 2018. "Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce." Sustainability 10, no. 8: 2929.
To obtain a suitable oxidation method for removing the color and lowering the chemical oxygen demand (COD) of waste soy sauce, Fenton (Fe2+), Fenton-like (Fe3+), and ozone (O3) oxidation methods are used as the target reactions. In experimental conditions for Fenton oxidation, the dose of Fe2+ and Fe3+ was varied between 100 mg/L and 300 mg/L. The dose of hydrogen peroxide for the reaction was injected from 100–1000 mg/L. For ozone oxidation, the pH was increased from 3 to 14 and the O3-containing gas was supplied continuously for 30 min through a gas diffuser at the bottom of the reactor at different applied O3 doses (10–90 mg/L). We subjected it to a simple 1:20 dilution with deionized water to identify the comparison result in detail. O3 oxidation shows the highest efficiencies of color removal (81.1%) and COD lowering (64.9%) among the three oxidation methods. This is mainly due to the fact that it has a relatively large amount of hydroxyl radical, resulting in the degradation of organics. Thus, O3 oxidation could be a promising method for removing the color and lowering the COD of waste soy sauce. The critical parameters (pH and applied O3 dose) were varied systematically to optimize O3 oxidation. It was found that the optimum pH and applied O3 dose are 11.0 mg /L and 50.0 mg /L, respectively (color removal = 34.2%, COD removal = 27.4%).
Hyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. Investigation of Oxidation Methods for Waste Soy Sauce Treatment. International Journal of Environmental Research and Public Health 2017, 14, 1190 .
AMA StyleHyun-Hee Jang, Gyu-Tae Seo, Dae-Woon Jeong. Investigation of Oxidation Methods for Waste Soy Sauce Treatment. International Journal of Environmental Research and Public Health. 2017; 14 (10):1190.
Chicago/Turabian StyleHyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. 2017. "Investigation of Oxidation Methods for Waste Soy Sauce Treatment." International Journal of Environmental Research and Public Health 14, no. 10: 1190.
Young-Jun Kang; Gyu-Tae Seo. Enhanced Production of Methane by SRT Control at Methane Fermentation Reactor in Two Phase Anaerobic Digestion of Food Waste. Journal of Korean Society of Water Science and Technology 2016, 24, 115 -126.
AMA StyleYoung-Jun Kang, Gyu-Tae Seo. Enhanced Production of Methane by SRT Control at Methane Fermentation Reactor in Two Phase Anaerobic Digestion of Food Waste. Journal of Korean Society of Water Science and Technology. 2016; 24 (6):115-126.
Chicago/Turabian StyleYoung-Jun Kang; Gyu-Tae Seo. 2016. "Enhanced Production of Methane by SRT Control at Methane Fermentation Reactor in Two Phase Anaerobic Digestion of Food Waste." Journal of Korean Society of Water Science and Technology 24, no. 6: 115-126.
Two-stage anaerobic digestion system consisting of two continuously stirred tank reactors (CSTRs) operating at mesophillic conditions (37 °C) were studied. The aim of this study is to determine optimum Hydraulic Retention Time (HRT) of the two-stage anaerobic digester system for hydrogen and methane production. This paper also discusses the effect of OLR with change in HRT on the system. Four different HRTs of 48, 24, 12, 8 h were monitored for acidogenic reactor, which provided OLR of 17.7, 34.8, 70.8, 106 g VS/L·d respectively. Two HRTs of 15 days and 20 days were studied with OLR of 1.24 and 1.76 g VS/L·d respectively in methanogenic reactor. Hydrogen production at higher OLR and shorter HRT seemed favorable 106 g VS/L·d (8 h) in acidogenic reactor system. In methanogenic reactor system HRT of 20 day with OLR of 1.24 g VS/L·d was found optimum in terms of methane production and organic removal. The result of this study illustrated the optimum HRT of 8 h and 20 days in acidogenic stage and methanogenic stage for maximum hydrogen and methane production.
Sachin Paudel; Youngjun Kang; Yeong-Seok Yoo; Gyu Tae Seo. Effect of volumetric organic loading rate (OLR) on H 2 and CH 4 production by two-stage anaerobic co-digestion of food waste and brown water. Waste Management 2016, 61, 484 -493.
AMA StyleSachin Paudel, Youngjun Kang, Yeong-Seok Yoo, Gyu Tae Seo. Effect of volumetric organic loading rate (OLR) on H 2 and CH 4 production by two-stage anaerobic co-digestion of food waste and brown water. Waste Management. 2016; 61 ():484-493.
Chicago/Turabian StyleSachin Paudel; Youngjun Kang; Yeong-Seok Yoo; Gyu Tae Seo. 2016. "Effect of volumetric organic loading rate (OLR) on H 2 and CH 4 production by two-stage anaerobic co-digestion of food waste and brown water." Waste Management 61, no. : 484-493.
This paper investigates the characteristics of graphene oxide (GO) for Bisphenol A (BPA) adsorption in water. Batch experiments on the influence of significant parameters were performed. While an improvement of the adsorption capacity of BPA was obtained by the increment of contact time and the initial BPA concentration, the increment of pH above 8, GO dosage, and temperature showed the reverse results. The thermodynamic study suggested that BPA adsorption on GO was an exothermic and spontaneous process. The kinetics was explained by the pseudo-second-order model which covers all steps of adsorption. The fit of the results with the Langmuir isotherm indicated the monolayer adsorption. At 298 K, the adsorption reached equilibrium within 30 min with the maximum adsorption capacity of 49.26 mg/g. The low BPA adsorption capacity of GO can be interpreted by the occurrence of oxygen-containing functional groups (OCFGs) that are able to form hydrogen bonds with the surrounding OCFGs and water molecules. This effect inhibited the role of π–π interactions that are mainly responsible for the adsorption of BPA.
Thatchaphong Phatthanakittiphong; Gyu Tae Seo. Characteristic Evaluation of Graphene Oxide for Bisphenol A Adsorption in Aqueous Solution. Nanomaterials 2016, 6, 128 .
AMA StyleThatchaphong Phatthanakittiphong, Gyu Tae Seo. Characteristic Evaluation of Graphene Oxide for Bisphenol A Adsorption in Aqueous Solution. Nanomaterials. 2016; 6 (7):128.
Chicago/Turabian StyleThatchaphong Phatthanakittiphong; Gyu Tae Seo. 2016. "Characteristic Evaluation of Graphene Oxide for Bisphenol A Adsorption in Aqueous Solution." Nanomaterials 6, no. 7: 128.
The aim of this study was to evaluate the potential of domestic wastewater for anaerobic hydrogen production. High-strength and ordinary-strength organic loadings of synthetic wastewater, i.e., real-time domestic wastewater with and without a mixture of food waste, were tested. During operation at a high strength loading, the initial pH was maintained at 7 and then gradually decreased, and a pH of 5–5.5 was observed as the best experimental condition. A pH of 5–5.5 was controlled during the operation at an ordinary-strength loading. Maximum hydrogen yields of 1.125 mol H2/mol glucose and 1.01 mol H2/mol glucose were observed during operation at high (48 g COD/L·day) and ordinary (3 g COD/L·day) strength loadings in terms of chemical oxygen demand (COD), respectively, with hydrogen contents of 42%–53%. The operating environment of the hydrogen production system was found to be very crucial because the metabolic pathway of the microorganism and production of intermediates were found to be dynamic with the controlled environment. Smaller COD removals of 30% and 26% were observed in high-strength and ordinarystrength loadings, respectively. Organic mass balance in terms of COD described the distribution of organics in the system via reactor byproducts. The findings of this study can be applied during the design of onsite domestic wastewater and energy recovery systems.
Sachin Paudel; Youngjun Kang; Yeong-Seok Yoo; Gyu Tae Seo. Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater. Sustainability 2015, 7, 16260 -16272.
AMA StyleSachin Paudel, Youngjun Kang, Yeong-Seok Yoo, Gyu Tae Seo. Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater. Sustainability. 2015; 7 (12):16260-16272.
Chicago/Turabian StyleSachin Paudel; Youngjun Kang; Yeong-Seok Yoo; Gyu Tae Seo. 2015. "Hydrogen Production in the Anaerobic Treatment of Domestic-Grade Synthetic Wastewater." Sustainability 7, no. 12: 16260-16272.
For further removal of nitrogen and phosphorus from secondary sewage effluent, two strains of microalgae, Chlorella sp. ADE4 and Chlorella vulgaris, were selected for cultivation in the membrane photobioreactor. The Chlorella sp. ADE4, isolated from wastewater illustrated higher removal efficiency of T-N and T-P, and faster algal growth than the Chlorella vulgaris in a batch experiment using treated sewage effluent. The T-N and T-P removal efficiency was 66.5% and 94.5%, respectively, within HRT of two days when the photobioreactor of Chlorella sp. ADE4 was operated in continuous mode. The effluent water quality was 6.3mg/L and 0.044mg/L for T-N and T-P. It was estimated that the algal biomass productivity was 55mg/L·d with T-N and T-P uptake rates of 6.25 and 0.483mg/L·d, respectively, in the system. Operational flux below 58 LMH was found to be effective for separation of algal cell from effluent in membrane system.
Rawiwan Boonchai; Gyutae Seo. Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent. Korean Journal of Chemical Engineering 2015, 32, 2047 -2052.
AMA StyleRawiwan Boonchai, Gyutae Seo. Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent. Korean Journal of Chemical Engineering. 2015; 32 (10):2047-2052.
Chicago/Turabian StyleRawiwan Boonchai; Gyutae Seo. 2015. "Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent." Korean Journal of Chemical Engineering 32, no. 10: 2047-2052.
The electronic structures of sulfonamide antibiotics (the ground state and the lowest singlet excited-state geometries) have been investigated by using density functional theory (DFT) simulations. Experimental studies on the removal of sulfamethazine, sulfathiazole and sulfamethoxazole by ozone have also been conducted by using liquid chromatography with tandem mass spectrometric detection (LC/MS/MS). The calculated ground and excited state geometries exhibited low energy of the inter-ring bonds, which suggests the weakest bonds that can be broken during the ozone oxidation process. The orbital energy calculations (HOMO-LUMO and its energy gap) demonstrate that the smaller HOMO-LUMO energy gap, the higher reactivity toward ozone oxidation. Additionally, the current study suggests potential products of the three pharmaceutical compounds based on their electronic properties, which may help better understand the unknown reaction pathways of the pharmaceutical compounds.
Jung Sik Won; Jutamas Kaewsuk; Jun Ho Jo; Dong-Hee Lim; Gyu Tae Seo. A Density Functional Theory Study on the Ozone Oxidation of Sulfonamide Antibiotics. Journal of Advanced Oxidation Technologies 2015, 18, 1 .
AMA StyleJung Sik Won, Jutamas Kaewsuk, Jun Ho Jo, Dong-Hee Lim, Gyu Tae Seo. A Density Functional Theory Study on the Ozone Oxidation of Sulfonamide Antibiotics. Journal of Advanced Oxidation Technologies. 2015; 18 (1):1.
Chicago/Turabian StyleJung Sik Won; Jutamas Kaewsuk; Jun Ho Jo; Dong-Hee Lim; Gyu Tae Seo. 2015. "A Density Functional Theory Study on the Ozone Oxidation of Sulfonamide Antibiotics." Journal of Advanced Oxidation Technologies 18, no. 1: 1.
In this study, carbonized porous media was manufactured using sewage sludge and analyzed for pollutants removal characteristics. Sewage sludge produced by activated sludge sewage treatment contained much organics to be carbonized, so it was mixed with other mixtures, extruded and formed in ∅ 5~10 mm ball shape, and sintered at 900°C and 1 hour in furnace for carbonization under N2 purge. The characteristics of the porous media was BET 35 m2/g and average pore size 39.3Å, pore volume 0.0092 cm3/g, Iodine number 45.9 and bulk density 0.91 cm3/g. Experiments were performed for SS, phosphate, nitrate and heavy metals (Cu, Zn). Its removal characteristics of SS and fertilizer components were compared with gravel’s used in filtration and its heavy metals removal was characterized by derivation of its adsorption equilibrium equations. In result, the carbonized porous media could be utilized as massive adsorption media for pollutant removal or fertilizer adsorption in fields of roof planting or non-point source pollutants control.
Yeong Seok Yoo; Jun Ho Jo; Gyu Tae Seo. Characteristics of Pollutants Removal by Carbonized Porous Media Made from Sewage Sludge. Materials Science Forum 2014, 804, 99 -102.
AMA StyleYeong Seok Yoo, Jun Ho Jo, Gyu Tae Seo. Characteristics of Pollutants Removal by Carbonized Porous Media Made from Sewage Sludge. Materials Science Forum. 2014; 804 ():99-102.
Chicago/Turabian StyleYeong Seok Yoo; Jun Ho Jo; Gyu Tae Seo. 2014. "Characteristics of Pollutants Removal by Carbonized Porous Media Made from Sewage Sludge." Materials Science Forum 804, no. : 99-102.
The purpose of the present study is to investigate the effects of nutrient starvation of microalgae on its nitrogen (N) and phosphorus (P) uptake, characteristics of extracellular polymeric substances (EPS), and algal sedimentation. An experiment was carried out by starving the wastewater-tolerant microalgae Chlorella sp. ADE4. The algal cultivation was put under various conditions of nutrient starvation in order to enhance nutrient removal and algal cell separation. The experimental results showed that 40 h of nutrient starvation prior to the cultivation did affect nutrient removal of Chlorella sp. ADE4. When using synthetic wastewater, the N-starved algae was the most effective in removing 82% of N in 48 h and 92% of P in 24 h. However, the starvation conditions did not cause noticeable removal improvement when microalgae were tested with real wastewater effluent. N and P removal efficiencies of 57 and 100%, respectively, were achieved in 48 h in real wastewater effluent. The lower N removal efficiency was caused by P limitation in the real sewage effluent. EPS were analyzed to evaluate if they play a role in algal cell agglomeration and subsequent microalgal separation. Carbohydrates and protein were indicated as major components in soluble and bound EPS. It was found that starvation of microalgae for 40 h could induce higher EPS production. Interestingly, the N-starved microalgae contained a large protein fraction in their EPS and low N content in their biomass. However, a significant correlation between EPS content and sedimentation efficiency was not observed in this study.
Rawiwan Boonchai; Jutamas Kaewsuk; Gyutae Seo. Effect of nutrient starvation on nutrient uptake and extracellular polymeric substance for microalgae cultivation and separation. DESALINATION AND WATER TREATMENT 2014, 55, 360 -367.
AMA StyleRawiwan Boonchai, Jutamas Kaewsuk, Gyutae Seo. Effect of nutrient starvation on nutrient uptake and extracellular polymeric substance for microalgae cultivation and separation. DESALINATION AND WATER TREATMENT. 2014; 55 (2):360-367.
Chicago/Turabian StyleRawiwan Boonchai; Jutamas Kaewsuk; Gyutae Seo. 2014. "Effect of nutrient starvation on nutrient uptake and extracellular polymeric substance for microalgae cultivation and separation." DESALINATION AND WATER TREATMENT 55, no. 2: 360-367.
A computational study was conducted to verify natural organic matter removal of two types of nanofiltration (NF) membranes. NF membranes used in this study were fully aromatic polyamide based on trimesoyl chloride and 1,3-benzenediamine (NE90) and semi-aromatic polyamide based on trimesoyl chloride and piperazine with polyvinyl chloride coating (NE70). The solute–membrane interaction was modeled using density functional theory (DFT) to clarify and verify the experiment results of our previous study. The calculations were performed by the calculated highest occupied molecular orbital and lowest unoccupied molecular orbital with frontier orbital gap which reflexed adsorption energy between organic molecules and the membrane surface materials. DFT showed as an effective tool to predict interaction phenomenon between solute and membranes, which is relative to membrane fouling and rejection of particular organic substances. The calculation results showed that carboxylic compound has high-energy gap and tend to adsorb on the membrane surface than the other compounds (phenolic and acetic acid) and it bound higher energy with NE90 than NE70. This is comparable with the experimental results that NE90 is consists of surface material, which is easily to be adsorbed by organic molecule, especially carboxylic type compound.
J. Kaewsuk; G.T. Seo. Computational study of NF membrane removal in rejection of specific NOM compounds. DESALINATION AND WATER TREATMENT 2013, 51, 6218 -6223.
AMA StyleJ. Kaewsuk, G.T. Seo. Computational study of NF membrane removal in rejection of specific NOM compounds. DESALINATION AND WATER TREATMENT. 2013; 51 (31):6218-6223.
Chicago/Turabian StyleJ. Kaewsuk; G.T. Seo. 2013. "Computational study of NF membrane removal in rejection of specific NOM compounds." DESALINATION AND WATER TREATMENT 51, no. 31: 6218-6223.
This experiment investigated and explains the rejection of calcium and magnesium ions and conductivity under the influence of the coexisting ions. Nanofiltration (NF) membranes have been used as pressure-driven type of cross-flow system in water treatment. The evolution of flux and rejection was followed in time during 2 h. For analysis and comparison, the values after 1 h of filtration were used. The NF membranes used in this study were thin film composite NF membranes NE90 (Woojing, Korea). The experiment indicated that Donnan exclusion had strong effect with cation when operated at low flux. However, the overall ion rejection, which was conducted by conductivity value, was high due to influence of dielectric phenomenon. For anion, electric repulsion between the NF membrane and chloride was high enough to push calcium and magnesium ions through the membrane by Donnan exclusion phenomenon. Chloride ion had stronger effect on the rejection of magnesium ion than the calcium ion. The results indicate that the electrostatic repulsion between the other anions (nitrate, sulfate, and bicarbonate ions) and the membranes seemed to be strong enough with the low concentration, but vice versa at high concentration.
Jutamas Kaewsuk; Dong Yun Lee; Taek Soon Lee; Gyu Tae Seo. Effect of ion composition on nanofiltration rejection for desalination pretreatment. DESALINATION AND WATER TREATMENT 2012, 43, 260 -266.
AMA StyleJutamas Kaewsuk, Dong Yun Lee, Taek Soon Lee, Gyu Tae Seo. Effect of ion composition on nanofiltration rejection for desalination pretreatment. DESALINATION AND WATER TREATMENT. 2012; 43 (1-3):260-266.
Chicago/Turabian StyleJutamas Kaewsuk; Dong Yun Lee; Taek Soon Lee; Gyu Tae Seo. 2012. "Effect of ion composition on nanofiltration rejection for desalination pretreatment." DESALINATION AND WATER TREATMENT 43, no. 1-3: 260-266.
Zeolite has been used as catalyzer, absorbent, ion-exchange matter and dehydrating agent due to its excellent catalytic property and ion-exchange. In recent years, many studies have been conducted to apply zeolite as new materials such as zeolite membranes and zeolite sensor films. To introduce properties of zeolite, it should be examined how zeolite could be reacted other materials. In this study, it is investigated whether zeolite is successfully synthesized or not when clay and/or sewage sludge coexist with zeolite precursor. Zeolite precursor was made of liquid sodium silicate and sodium aluminate. Mixing ratio of caly and/or sewage sludge is 0-10%(wt.). To compare two processes, the mixture was synthsized by hydrothermal method and high temperature sintering process. It is synthesized by hydrothermal with sintering at high temperature process. The resulting materials were characterized by XRD and SEM. As a result, various type of zeolite such as zeolite X, zeolite A and zeolite P1 was successfully synthesized by hydrothermal method when clay and/or sewage coexist with zeolite precursor. However, zeolite was rarely synthesized by high temperature sintering process. Therefore, when preperation of zeolite material mixed with other material such as clay and sewage sludge, hydrothermal method is more effective than sintering at high temperature process.
Yeong Seok Yoo; Kyeong Ho Cheon; Jae Ik Lee; Hyo Jin Ban; Gyu Tae Seo. Synthesis of Zeolite Added Clay and Sewage Sludge. Materials Science Forum 2009, 620-622, 229 -232.
AMA StyleYeong Seok Yoo, Kyeong Ho Cheon, Jae Ik Lee, Hyo Jin Ban, Gyu Tae Seo. Synthesis of Zeolite Added Clay and Sewage Sludge. Materials Science Forum. 2009; 620-622 ():229-232.
Chicago/Turabian StyleYeong Seok Yoo; Kyeong Ho Cheon; Jae Ik Lee; Hyo Jin Ban; Gyu Tae Seo. 2009. "Synthesis of Zeolite Added Clay and Sewage Sludge." Materials Science Forum 620-622, no. : 229-232.
The objective of this study is to develop a novel powder activated carbon (PAC) by surface modification with magnetite nano-particles for enhanced removal of NOM in water. The PAC used for experiment was two types, SAC (wood-based) and MAC (coal-based). First the PAC was treated by heat at 650 or 900 °C for 1hr under N2. And then the PAC surface was synthesized with magnetite nano-particles at the same condition. Adsorption tests of NOM were carried out to identify functional characteristics of the surface modified. Despite reduced surface area, adsorption capacity of the surface modified PAC was comparable to the virgin one. However much increased adsorption capacity was obtained by heat treatment of the PACs. SEC and SUVA254 results showed no specific selectivity in removal of NOM by the modification of PAC surface characteristics. Enhanced oxidation of the NOM was also observed by the magnetite nano-particle synthetic PACs in contact with ozone. Conclusively the surface modification of the PAC has high potential as a novel adsorption material for advanced water treatment.
Gyu Tae Seo; Sung Su Kim; Jutamas Kaewsuk; Jin Tae Kim. Synthesis of Magnetite Nano-Particles and Powder Activated Carbon as a Novel Material for Water Treatment. Materials Science Forum 2009, 620-622, 145 -148.
AMA StyleGyu Tae Seo, Sung Su Kim, Jutamas Kaewsuk, Jin Tae Kim. Synthesis of Magnetite Nano-Particles and Powder Activated Carbon as a Novel Material for Water Treatment. Materials Science Forum. 2009; 620-622 ():145-148.
Chicago/Turabian StyleGyu Tae Seo; Sung Su Kim; Jutamas Kaewsuk; Jin Tae Kim. 2009. "Synthesis of Magnetite Nano-Particles and Powder Activated Carbon as a Novel Material for Water Treatment." Materials Science Forum 620-622, no. : 145-148.
Yeong Seok Yoo; Kyeong Ho Cheon; Jae Ik Lee; Beom Suk Kim; Woo Seob Shin; Gyu Tae Seo. Zeolite Synthesis Using Sewage Sludge by Molten-Salt Method. Materials Science Forum 2008, 329 -332.
AMA StyleYeong Seok Yoo, Kyeong Ho Cheon, Jae Ik Lee, Beom Suk Kim, Woo Seob Shin, Gyu Tae Seo. Zeolite Synthesis Using Sewage Sludge by Molten-Salt Method. Materials Science Forum. 2008; ():329-332.
Chicago/Turabian StyleYeong Seok Yoo; Kyeong Ho Cheon; Jae Ik Lee; Beom Suk Kim; Woo Seob Shin; Gyu Tae Seo. 2008. "Zeolite Synthesis Using Sewage Sludge by Molten-Salt Method." Materials Science Forum , no. : 329-332.
B.H. Moon; Y.B. Park; S.S. Kim; Gyu Tae Seo; T.S. Lee; T.S. Kim. Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron. Materials Science Forum 2007, 705 -708.
AMA StyleB.H. Moon, Y.B. Park, S.S. Kim, Gyu Tae Seo, T.S. Lee, T.S. Kim. Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron. Materials Science Forum. 2007; ():705-708.
Chicago/Turabian StyleB.H. Moon; Y.B. Park; S.S. Kim; Gyu Tae Seo; T.S. Lee; T.S. Kim. 2007. "Degradation of Azo Dyes by the Reduction and Oxidation with Nano Sized Zero Valented Iron." Materials Science Forum , no. : 705-708.
The filtration characteristics of two different module configurations with coarse pore filter (non-woven fabric) were investigated for sludge floc separation in an activated sludge reactor for domestic wastewater reclamation. A polypropylene non-woven fabric filter (35 g/m2) was used for the two different module configurations, one flat and one tubular type, each with a filtration area of 0.052 m2. The different module types, submerged in the oxic compartment of A/O (anaerobic/oxic) type reactors, were operated simultaneously. The filtration fluxes were gradually increased from 0.5 to 1.2 and 1.73 m/d. The filtration pressures were more stably maintained for the tubular type module than the plate type. The tubular type module installed horizontally with two-side suction showed less filtration pressures than the tubular type module installed vertically with one-side suction. The solid separation was significantly high showing less than 5 mg/L effluent solids. The organic and T-N removal efficiencies were around 95 and 50%, respectively. The 85% removal of T-P was achieved with 20 mg/L injection of PAC (poly-aluminum chloride).
G.T. Seo; B.H. Moon; Y.M. Park; S.H. Kim. Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation. Water Science and Technology 2007, 55, 51 -58.
AMA StyleG.T. Seo, B.H. Moon, Y.M. Park, S.H. Kim. Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation. Water Science and Technology. 2007; 55 (1-2):51-58.
Chicago/Turabian StyleG.T. Seo; B.H. Moon; Y.M. Park; S.H. Kim. 2007. "Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation." Water Science and Technology 55, no. 1-2: 51-58.
This paper focuses on the evaluation of organic and detergent degradation in a combined Ozone/UF system for domestic laundry wastewater reclamation. Formation of by-product was investigated by GC/MS for the reclaimed water. Ozone was injected into the raw wastewater in a 10 L contact tank and the wastewater was circulated through the membrane module for inner pressurized cross-flow filtration. The concentrate was returned back to the contact tank. The membrane used in this experiment was hollow fiber polysulfone UF membrane with MWCO 10,000. It has an effective filtration area of 0.06 m2. The experiment was carried out with intermittent ozone injection, 5 min injection and 10 min idling. Ozone was dosed at the concentration of 1.5 mg/L. The flux of the UF could be maintained at 0.24 m/d under filtration pressure 40-45 kPa and water temperature, 20-22°C. The organic removal efficiency by the system was 90% in terms of COD. Ozone was considerably effective to degrade organics in the wastewater. Molecular weight of organics in the raw waste was mostly greater than 10,000 (72% of 950 mgCOD/L). However 86% of effluent COD (94-100 mg/L) was composed of organics smaller than MWCO 500 by ozone injection. No harmful by-products by ozone contact were detected from the analysis of treated water using GC/MS. It was identified that residual organics in the treated water were 1,1′-Oxybisbenzene, Octadecanoic acid, Squalene and Benzenmethanol, etc., which were additives contained originally in the detergent. Consequently the reclaimed water quality could be estimated safe enough to recycle for the rinsing cycle in a washing machine.
G.T. Seo; T.S. Lee; J.T. Kim; C.H. Yoon; H.G. Park; S.C. Hong. Organic and detergent degradation in combined O3/UF for domestic laundry wastewater reclamation. Water Science and Technology 2004, 50, 331 -336.
AMA StyleG.T. Seo, T.S. Lee, J.T. Kim, C.H. Yoon, H.G. Park, S.C. Hong. Organic and detergent degradation in combined O3/UF for domestic laundry wastewater reclamation. Water Science and Technology. 2004; 50 (6):331-336.
Chicago/Turabian StyleG.T. Seo; T.S. Lee; J.T. Kim; C.H. Yoon; H.G. Park; S.C. Hong. 2004. "Organic and detergent degradation in combined O3/UF for domestic laundry wastewater reclamation." Water Science and Technology 50, no. 6: 331-336.
This study focuses on the practical application of high concentration powdered activated carbon coupled membrane bio-reactor to domestic wastewater reclamation. The study was conducted in three parts, such as analysis of secondary domestic wastewater effluent, design and operation parameter evaluation and reclaimed water quality estimation for stream restoration. The organic concentration was 25.2-80.2 mgCODCr/L for the effluent of three domestic wastewater treatment plants. Around 50-75% of the COD was low molecular substances less than 1,000 which were quite biodegradable. The sawdust PAC was estimated to be proper adsorbent for the organics in the secondary effluents. Its Freundlich constant, K value was 5.847 and 1/n, 0.36. Using a system consists of single reactor with high concentration PAC (80 g/L) and submerged hollow fiber MF membrane module with nominal pore size of 0.1 μm, design and operation parameters were obtained, such as HRT of the bioreactor (2.5 hr), PAC concentration (80 g/L), the initial ßux (less than 0.5 m/day) and intermittent suction cycle (12 min. suction and 3 min. idling). Organic removal by the system was high enough to produce reclaimed water for urban stream restoration The effluent organic concentration was at the level of 2 mg/L in terms of TOC (around 5 mg/L as CODCr). Substances with molecular weight cut off <1,000 were removed mostly by adsorption and biodegradation. Those above 1,000 were rejected at PAC cake layer on the membrane and gradually degraded by microorganisms during extended contact.
G.T. Seo; H.I. Ahan; J.T. Kim; Y.J. Lee; I.S. Kim. Domestic wastewater reclamation by submerged membrane bioreactor with high concentration powdered activated carbon for stream restoration. Water Science and Technology 2004, 50, 173 -178.
AMA StyleG.T. Seo, H.I. Ahan, J.T. Kim, Y.J. Lee, I.S. Kim. Domestic wastewater reclamation by submerged membrane bioreactor with high concentration powdered activated carbon for stream restoration. Water Science and Technology. 2004; 50 (2):173-178.
Chicago/Turabian StyleG.T. Seo; H.I. Ahan; J.T. Kim; Y.J. Lee; I.S. Kim. 2004. "Domestic wastewater reclamation by submerged membrane bioreactor with high concentration powdered activated carbon for stream restoration." Water Science and Technology 50, no. 2: 173-178.