• Title/Summary/Keyword: Organic pretreatment

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Comparison and application method of seawater desalination pre-treatment process (해수담수화 전처리공정 비교 및 적용 방법)

  • Lim, Hwankyu;Kim, Seunghyun
    • Journal of Korean Society of Water and Wastewater
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    • v.33 no.6
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    • pp.437-446
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    • 2019
  • Reverse osmosis seawater desalination facilities can extend the cleaning cycle and replacement time of the reverse osmosis membrane by pretreatment process. Selection of pretreatment process depends on water quality. It was attempted in this study to select approriate pretreatment process for the Masan bay, which was high in particles and organic content. For this purpose, performances of pretreatment processes such as filter adsorber (FA), pore controllable fiber (PCF), and ultrafiltration (UF) were compared based on the silt density index (SDI). The SDI value of the filtrate should be less than 3. The study results showed that UF can produce the filtrate quality satisfying the requirement. However, the transmembrane pressure (TMP) of UF increased quickly, reaching 0.6 bar within 4 days. In order to secure stable operation, FA and PCF were combined with UF. The study results showed that combination of PCF and UF was able to extend the filtration duration (more than 2 months) until to reach TMP of 0.6 bar.

Biostability Characterization in a Full-scale Nanofiltration Water Treatment System (대규모 나노여과 정수처리 시스템에서의 생물학적 안정성에 관한 연구)

  • Hong, Seung-Kwan;Escobar, Isabel C.;Cho, Jae-Weon
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.2
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    • pp.158-162
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    • 2005
  • The objective of this study was to assess the assimilable organic carbon (AOC) in processing water, a measurement of biostability, at several stages of a full-scale nanofiltration (NF) water treatment plant. The NF membrane plant investigated was a $45,400\;m^3$/day (12 mgd) water softening facility at Plantation City in southern Florida, which utilized an organic rich groundwater (dissolved organic carbon (DOC) = 17.6 mg/L) originated from a surficial aquifer. The average AOC concentration of raw feed water was estimated at 158 g/L acetate-C. After pretreatment(acid and antiscalant addition), AOC levels increased by 12.7%, suggesting that pretreatment chemicals used to control scaling may deteriorate feed water biostability. The results also demonstrated that nanofiltration was capable of effectively removing 63.4% of AOC and 94.8% of DOC from the raw water. AOC rejection in stage 1 (${\approx}\;68%$) was slightly higher than that of stage 2 (${\approx}\;58%$) indicating that AOC was removed less at the solution environment (i.e. low pH, high ionic strength and high hardness), which was often created in the $2^{nd}$ stage of full-scale membrane plants due to pretreatment (acid addition) and high recovery operation.

A Study on Establishment of Technical Guideline of the Installation and Operation for the Biogas Utilization of Transportation and City Gas: Design and Operation Guideline (고품질화 바이오가스 이용 기술지침 마련을 위한 연구(III): 도시가스 및 수송용 - 기술지침(안) 중심으로)

  • Moon, HeeSung;Kwon, Junhwa;Park, Hoyeon;Jeon, Taewan;Shin, Sunkyung;Lee, Dongjin
    • Journal of the Korea Organic Resources Recycling Association
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    • v.27 no.2
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    • pp.67-73
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    • 2019
  • In this study, to optimize the production and utilization of biogas for organic waste resources, the precision monitoring of on-site facilities and the energy balance by facility were analyzed, and the solutions for field problems were investigated, and the design and operation guidelines for pretreatment facilities and generators were presented. Gas pre-treatment is required to solve frequent failures and efficiency degradation in operation of high quality refining facilities, and processing processes such as desulfurization, dehumidification, deoxidization, dust treatment, volatile organic compounds, etc. Since these processes are substances that are also eliminated from the high-quality process, quantitative guidelines are not presented in the gas pretreatment process, but are suggested to operate during the processing process as a qualitative guideline. In particular, dust, siloxane, and volatile organic compounds are the main cause of frequent failure of high-quality processes if they are not removed from the gas pretreatment process. Design of the biogas high-quality process. The operation guidelines provide quality standards [Methane content (including propane) of 95% or more] with 90% or more utilization of the total gas generation, two systems, and a margin of 10% or more. It also proposed installing gas equalization tank, installing thermal automatic control system for controlling equalization of auxiliary fuel, installing dehumidification device at the back of high quality for removing moisture generated in the process of gas compression, installing heat-resisting facilities to prevent freezing of facilities in winter and reducing efficiency, and installing membrane facilities in particular.

Integrated Digestion of Thermal Solubilized Sewage Sludge to Improve Anaerobic Digestion Efficiency of Organic Waste (유기성 폐기물의 혐기성 소화효율 향상을 위한 열가용화 하수슬러지의 통합소화)

  • Oh, Kyung Su;Hwang, Jung Ki;Song, Young Ju;Kim, Min Ji;Park, Jun Gyu;Pak, Dae Won
    • Journal of Korean Society on Water Environment
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    • v.38 no.2
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    • pp.95-102
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    • 2022
  • Studies for improving the efficiency of the traditional anaerobic digestion process are being actively conducted. To improve anaerobic digestion efficiency, this study tried to derive the optimal pretreatment conditions and mixing conditions by integrating the heat solubilization pretreatment of sewage sludge, livestock manure, and food waste. The soluble chemical oxygen demand (SCOD) increase rate of sewage sludge before and after heat solubilization pretreatment showed an increased rate of 224.7% compared to the control group at 170℃ and 25 min and showed the most stable increase rate. As a result of the biomethane potential test of sewage sludge before and after heat solubilization pretreatment, the total chemical oxygen demand (TCOD) and SCOD removal rates increased as the heat solubilization temperature increased, but did not increase further at temperatures above 170℃. In the case of methane generation, there was no significant change in the cumulative methane generation from 0.134 to 0.203 Sm3-CH4/kg-COD at 170℃ for 15 min. As a result of the integrated digestion of organic waste, the experimental condition in which 25% of the sewage sludge, 50% of the food waste, and 25% of the livestock manure were mixed showed the highest methane production of 0.3015 m3-CH4/kg-COD, confirming that it was the optimal mixing ratio condition. In addition, under experimental conditions mixed with all three substrates, M4 conditions mixed with 25% sewage sludge, 50% food waste, and 25% livestock manure showed the highest methane generation at 0.2692 Sm3-CH4/kg-COD.

Effect of Heat Treatment on Biohydrogen Production from Food Waste (음식폐기물의 생물학적 수소 발효시 열처리 효과)

  • Lee, Chae-Young;Park, In-Geun
    • Journal of the Korea Organic Resources Recycling Association
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    • v.18 no.1
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    • pp.81-88
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    • 2010
  • Characteristic of hydrogen production was investigated to find the optimum heat pretreatment conditions for the anaerobic fermentation of food waste. The heat pretreatment of food waste enhanced the hydrogen yield due to the increase of soluble chemical oxygen demand (SCOD) and carbohydrate content. This result revealed that the maximum degrees of disintegration of SCOD and carbohydrate content were 55.1% and 223.6%, respectively. On the other hand, the improvement of hydrogen yield was insignificantly affected by heating reaction time at longer than 20 min; the increase of hydrogen yield was only about 7% between 20min and 1 hour. Therefore, the increase of reaction time more than 20min was not necessary.

Determination of operating factor and characteristics of membrane fouling on hybrid coagulation pretreatment-UF system in drinking water treatment (정수처리 응집·한외여과 시스템의 연속운전을 통한 운전조건 결정 및 막오염 특성에 관한 연구)

  • Moon, Seong-Yong;Yun, Jong-Sub;Kim, Seung-Hyun
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.2
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    • pp.267-274
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    • 2008
  • This study is about efficiency of pretreatment process and operating factor to membrane process at continuous coagulation/ultrafiltration process in water treatment. The capacity of pilot plant was $0.06{\beta}(C)/d$. The raw water used was from Nakdong stream which was characteristized by high organic matter and high turbidity. The result of the test was that coagulation is good process as to high removal rate to organic matter and turbidity but It caused problem to membrane pore blocking. This paper is to determine the membrane fouling potential under different membrane flux, backwash pressure and linear velocity. Backwash pressure and flux is important parameter on operation of membrane system. Those are directly affected on membrane system. When backwash pressure increased from 150 kPa to 200 kPa, the result showed that fouling (pressure increase rate) changed from 3.69 kPa/h to 0.93 kPa/h and the recovery rate changed from 90.7 % to 82.0 %. Linear velocity had slightly effect on fouling. Linear velocity increased from 0.2 m/s to 0.5 m/s, the corresponding pressure rate changed from 0.93 kPa/d to 0.77 kPa/d.

Plating of Cu layer with the aid of organic film on Si-wafer (유기박막을 이용한 Si기판상의 구리피복층 형성에 관한 연구)

  • Park Ji-hwan;Park So-yeon;Lee Jong-kwon;Song Tae-hwa;Ryoo Kun-kul;Lee Yoon-bae;Lee Mi-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.5 no.5
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    • pp.458-461
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    • 2004
  • In order to improve the adhesion properties of copper, MPS(3-mercaptopropyltrimethoxysilane) organic film were employed. The plasma pretreatment in pure He or $He/O_{2}$ mixed gas environment greatly increased adhesion force. Adhesion force was measured by scratch test with nano indenter. Microstructures and surface roughness were observed with scanning electron microscope(SEM). The characteristics of MPS layer for pretreatment were studied with flourier transform infrared spectroscope(FT-IR) and contact angle tester. The heighest adhesion was achieved in the specimen pretreated with mixed plasma and NPS coating, which was 56mN. Other specimen showed lower value by $20{\%}$ to $30{\%}$. The roughness of substrate was not affected by the bonding strength of copper plating.

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Enhanced adhesion properties of conductive super-hydrophobic surfaces by using zirco-aluminate coupling agent

  • Park, Myung-Hyun;Ha, Ji-Hwan;Song, Hyeonjun;Bae, Joonwon;Park, Sung-Hoon
    • Journal of Industrial and Engineering Chemistry
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    • v.68
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    • pp.387-392
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    • 2018
  • Various technical approaches and concepts have been proposed to develop conductive super-hydrophobic (SH) surfaces. However, most of these approaches are not usable in practical applications because of insufficient adhesion and cost issues. Additionally, durability and uniformity issues are still in need of improvement. The goal of this research is to produce a large-area conductive SH surface with improved adhesion performance and uniformity. To this end, carbon nanotubes (CNT) with a high aspect ratio and elastomeric polymer were utilized as a conductive filler and matrix, respectively, to form a coating layer. Additionally, nanoscale silica particles were utilized for stable implementation of the conductive SH surface. To improve the adhesion properties between the SH coating layer and substrate, pretreatment of the substrate was conducted by utilizing both wet and dry etching processes to create specific organic functional groups on the substrate. Following pretreatment of the surface, a zirco-aluminate coupling agent was utilized to enhance adhesion properties between the substrate and the SH coating layer. Raman spectroscopy revealed that adhesion was greatly improved by the formation of a chemical bond between the substrate and the SH coating layer at an optimal coupling agent concentration. The developed conductive SH coating attained a high electromagnetic interference (EMI) shielding effectiveness, which is advantageous in self-cleaning EMI shielding applications.

Optimization of Anaerobic Process by Enzyme Treatment of High Concentration Organic Substances in Food Wastewater

  • Tae-Hwan JEONG;Woo-Taeg KWON
    • Journal of Wellbeing Management and Applied Psychology
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    • v.6 no.2
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    • pp.33-37
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    • 2023
  • Purpose: Since 2013, marine dumping of wastewater has been banned, and research on eco-friendly and efficient land treatment has emerged. This study compared and tested changes in biogas production and anaerobic process efficiency depending on whether or not enzyme pretreatment was performed during anaerobic digestion from single-phase and two-phase to medium-temperature. Research design, data and methodology: The total sugar, direct sugar, pH, and acidity before and after fermentation were analyzed by G/C by anaerobic fermentation of the liquor wastewater, food wastewater 1, and food wastewater 2 at 30℃ for 67 hours, and the amount of methane gas generated was analyzed by balloon volume. Results: It was found that stable organic acid concentration and pH were found in the enzyme-treated food wastewater 2, and the amount of methane gas generated was also increased. Conclusions: When anaerobic digestion of the liquor wastewater and the food wastewater together, the performance of enzyme pretreatment resulted in increased digestive efficiency. It will be the basic data that can contribute to carbon neutrality and greenhouse gas reduction by increasing the production of biogas.

Improvement of Pressurized MF Pretreatment in MF/RO Process for Reuse (하수방류수 재이용 MF/RO 공정에서 가압식 MF의 전처리 성능 향상 방안 연구)

  • Na, Yumee;Park, Yong-Min;Lee, Yang-Woo;Kim, Won Kyong;Kim, Ji-Tae;Cho, Il-Hyoung
    • Membrane Journal
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    • v.24 no.5
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    • pp.350-357
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    • 2014
  • Pressurized MF membranes are used to remove suspended solid and colloidal materials of wastewater treatment plant effluent as the pretreatment of RO in reuse water production process. Membrane operation data and pollutants removal efficiency are investigated using 100 t/d scale pilot plant in J wastewater treatment plant located in Namyangju city. 40 LMH flux of pressurized MF membrane are obtained in various turbidity and temperature condition. Coagulation of dissolved organic enables flux improvement of MF from 40 LMH to 60 LMH. Pressure drop of 1st RO elements rapidly increased after long-term pause, which is because the complex contamination of organic matter and ionic substances of pluming systems.