• Title/Summary/Keyword: Advanced Water Treatment Process

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Progresses in membrane and advanced oxidation processes for water treatment

  • Khulbe, K.C.;Feng, C.Y.;Matsuura, T.;Ismail, A.F.
    • Membrane and Water Treatment
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    • v.3 no.3
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    • pp.181-200
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    • 2012
  • At present water crisis is not an issue of scarcity, but of access. There is a growing recognition of the need for increased access to clean water (drinkable, agricultural, industrial use). An encouraging number of innovative technologies, systems, components, processes are emerging for water-treatment, including new filtration and disinfectant technologies, and removal of organics from water. In the past decade many methods have been developed. The most important membrane-based water technologies include reverse osmosis (RO), ultrafiltration (UF), microfiltration (MF), and nanofiltration. Beside membrane based water-treatment processes, other techniques such as advanced oxidation process (AOP) have also been developed. Some unconventional water treatment technology such as magnetic treatment is also being developed.

Cost Evaluation for the Decision of Advanced Treatment Processes (최적 고도정수처리공정 선정을 위한 경제성 평가)

  • Lee, Kyung-Hyuk;Shin, Heung-Sup;An, Hyo-Won;Chae, Sun-Ha;Lim, Jae-Lim
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.5
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    • pp.511-516
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    • 2008
  • Since 1989, Advanced drinking water treatment processes began to build in Korea, especially the water treatment plants around the Nak-dong river stream due to sequential pollutant accidents. Moreover, Advanced drinking water treatment processes, ozone and GAC, are again to be built in water treatment plants around Han-river stream to control taste and odor, micro pollutants. However, there are still a lot of discussion to decide the processes to apply for advanced treatment. Thus there are still need to understand clearly on the cost evaluation of each advanced treatment processes. The cost evaluation was accomplished based on the data of six water treatment plants which are currently being either operating or constructing. Exceptionally, PAC(Powdered Activated Carbon) process was evaluated with cost estimation from construction company. The capital cost per unit volume of ozone process was significantly decreased as the treatment capacity increased. The capital cost was in the order of GAC, ozone and GAC. The operation cost decreased in the order of PAC, GAC and ozone. The total cost considering present value shows that ozone process covers 84% of ozone and GAC process for $30,000m^3/d$ capacity while it covers less than 35% for over 140 thousands $m^3/d$ capacity. Comparing GAC only, and ozone/GAC process, ozone/GAC process is more cost effective for high capacity water treatment plant.

Analysis of the cost effectiveness according to T-P standard enforcement of public sewage treatment facilities (공공하수처리시설의 총인기준 강화에 따른 비용효과분석)

  • Jeong, Won-Gu;Rim, Jay-Myung
    • Journal of Industrial Technology
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    • v.31 no.A
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    • pp.135-145
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    • 2011
  • This study was conducted to analyze the cost effectiveness in line with total phosphorus standard enforcement of public sewage treatment facilities. The additional cost for the total phosphorus removal process was calculated to analyze the cost effectiveness of the advanced water purification process. The analysis results showed that the T-P removal by coagulation sedimentation was more efficient than the advanced water purification facilities in terms of facilities investment cost, and if the coagulation filteration was used for T-P removal, the activated carbon process among the advanced water purification techniques was more efficient in terms of facilities investment cost. In this study, the effects of the T-P removal process that will be additionally introduced according to the tightening of the effluent T-P standard were analyzed within a limit. The actual benefits of improved T-P concentration in the water source will provide diverse values, including the leisure water, environment improvement water, eco-system in the water source and industrial water, in addition to the advanced water purification.

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Effect of Advanced Treatment Process for Residual Chlorine Decay and THM Formation in Water Distribution System (고도처리공정이 관로 내 잔류염소 감소 및 THM 생성에 미치는 영향)

  • Lee, Doo-Jin;Kim, Young-Il;Kim, Sung-Su;Lee, Kyung-Hyuk;Park, Hyun-A
    • Journal of Korean Society of Environmental Engineers
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    • v.29 no.4
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    • pp.419-424
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    • 2007
  • According to increase of consumer's desire for clean tap water, advanced treatment processes include with membrane, ozone, and granular activated carbon(GAC) were introduced. In order to evaluate the effect of advanced treatment processes for residual chlorine decay and trihalomethane(THM) formation in water distribution system, dissolved organic matter(DOC) removal of each advanced treatment process was investigated. The residual chlorine decay and THM formation using bottle tests were also evaluated. $UV_{254}$ removal in all advanced treatment was better than DOC removal. Especially, DOC by ozone treated was removed as 4% in contrast with sand filtered water, but $UV_{254}$ was removed about 17%. This result might be due to convert from hydrophobic DOC to hydrophilic DOC by ozonation. Ozone/GAC process was most effective process for DOC removal. The residual chlorine decay constants in treated water by sand filtration, ozonation, GAC adsorption, and ozone/GAC processes were 0.0230, 0.0307, 0.0117 and 0.0098 $hr^{-1}$, respectively. The sand filtered water was produced 81.8 ${\mu}g/L$ of THM after 190 hours of reaction time, as the treated water by ozone, GAC, and Ozone/GAC was less produced 6.0, 26.2, 30.3% in contrast with sand filtered water, respectively. Consequently, the durability of residual chlorine and reduction of THM formation were improved by advanced treatment processes.

A Treatment Efficiency of Wastewater by using Sym-Bio Process and Dissolved Ozone flotation Process for Water Reuse (하수처리수 재이용을 위하여 Sym-bio공정과 용존 오존 부상공정을 이용한 하수처리의 효율 분석)

  • Park, Changyu;Park, Jaehan;Lee, Kyunghee;Ahn, Yoonhee;Ko, Kwangbaik;Jung, Hyuncheol
    • Journal of Korean Society on Water Environment
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    • v.24 no.1
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    • pp.86-90
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    • 2008
  • Water reuse of effluent is limited, due to bacteria and chromaticity or turbidity which may result in low perception of water quality. Consequently, this study showed a method in the reuse of treated wastewater by a diversified treatment method, with separation of centralized reformation of aeration tank into pre-treatment with minimum installation of facilities, and post-treatment, applying advanced oxidation treatment. A pilot plant experiment was performed using Sym-Bio process adopting an NADH Sensor without modification of the exiting aeration tank. The Dissolved Ozone Flotation process, which is an advanced oxidation process, to treat the remaining organics, nutrients, chromaticity, turbidity and bacteria. As a result in the Sym-Bio process, the biological treatment, even on the condition of single stage reaction tank, the treatment efficiencies of BOD, $COD_{Mn}$, $COD_{Cr}$, SS and T-N were 96.6%, 84.6%, 88.25%, 95.1% and 71.0%, respectively, while that for T-P was 25.0%, which required further treatment. In the Dissolved Ozone Flotation process, the advanced oxidation treatment, the treatment efficiencies of BOD, $COD_{Mn}$, $COD_{Cr}$, SS, T-N, T-P, chromaticity, turbidity, bacteria, coliforms were 78.9%, 34.6%, 28.7%, 48.0%, 70.4%, 82.4%, 84.0%, 74.5%, 99.8% and 99.4%, respectively.

Improvement of Organic Substances Indicators by Linked Ultra Violet-Advanced Oxidation Process After Ozonation for Anaerobic Digested Wastewater (소화탈리액 대상 오존 전처리와 Ultra Violet-Advanced Oxidation Process 연계 처리를 통한 유기물질 지표 개선)

  • Jaiyeop Lee;Jesmin Akter;Ilho Kim
    • Journal of Korean Society of Water and Wastewater
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    • v.37 no.5
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    • pp.253-259
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    • 2023
  • Bioreactors are devices used by sewage treatment plants to process sewage and which produce active sludge, and sediments separated by solid-liquid are treated in anaerobic digestion tanks. In anaerobic digestion tanks, the volume of active sludge deposits is reduced and biogas is produced. After dehydrating the digestive sludge generated after anaerobic digestion, anaerobic digested wastewater, which features a high concentration of organic matters, is generated. In this study, the decomposition of organic carbon and nitrogen was studied by advanced oxidation process. Ozone-microbubble flotation process was used for oxidation pretreatment. During ozonation, the TOC decreased by 11.6%. After ozone treatment, the TOC decreased and the removal rate reached 80.4% as a result of the Ultra Violet-Advanced Oxidation Process (UV-AOP). The results with regard to organic substances before and after treatment differed depending on the organic carbon index, such as CODMn, CODCr, and TOC. Those indexes did not change significantly in ozone treatment, but decreased significantly after the UV-AOP process as the linkage treatment, and were removed by up to 39.1%, 15.2%, and 80.4%, respectively. It was confirmed that biodegradability was improved according to the ratio of CODMn to TOC. As for the nitrogen component, the ammonia nitrogen component showed a level of 3.2×102 mg/L or more, and the content was maintained at 80% even after treatment. Since most of the contaminants are removed from the treated water and its transparency is high, this water can be utilized as a resource that contains high concentrations of nitrogen.

Treatment Efficiency and Organic Matter Characterization of Wastewater through Activated Sludge Process and Advanced Wastewater Treatment Process (활성슬러지공정과 고도처리공정에 따른 하수처리수의 처리효율과 유기물 특성)

  • Hong, JiHea;Sohn, Jinsik
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.6
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    • pp.807-813
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    • 2004
  • Wastewater was treated by two different treatment processes; activated sludge process and advanced wastewater treatment process (KNR process) using lab-scale experiment. Two treated wastewater showed good treatment efficiency of organic matter removal, up to 90% removal. Nitrogen and phosphorus were not effectively removed though activated sludge process, while KNR process showed good removal efficiency of nitrogen and phosphorus; 56% nitrogen removal and 95% phosphorus removal. KNR process showed better removal efficiency of organic matter, nitrogen, and phosphorus compared to activated sludge process. Organic matter characterization was tracked though measurement of UV scan, SUVA, and XAD fractionation. Treated wastewater showed higher SUVA value than wastewater influent, indicting less aromatic characteristic of organic matter. XAD fractionation showed hydrophilic fraction decreased though wastewater treatment, suggesting microbes preferentially digest hydrophilic and aliphatic molecules rather than hydrophobic and aromatic molecules of organic matter.

Investigation of Treatment Efficiency for Advanced Processes of Water Treatment Plants in Korea (국내 정수장 고도정수처리 공정에서 공정별 처리효율 조사)

  • Mun, Sung-Min;Choi, Suing-Il;Sohn, Jin-Sik;Yoon, Je-Yong
    • Journal of Korean Society of Water and Wastewater
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    • v.19 no.3
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    • pp.323-329
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    • 2005
  • Advanced processes such as ozonation or activated carbon filtration (ACF) in water treatment plants have been used in Korea since 1994. At present, seventeen drinking water treatment plants are currently operating. This survey compares the treatment performance of advanced processes in eight plants which have comparable water quality data. The three parameters (DOC, $UV_{254}$, and $KMnO_4$ consumption) of water quality were selected as an indicator of treatment efficiency. The treatment efficiency of ozonation and ACF processes was found to vary with large deviations in each plant. Treatment efficiency of DOC, $UV_{254}$, and $KMnO_4$ consumption by post ozonation ranged from 3 to 11%, 6 to 33%, and 12 to 28% respectively. On the other hand, for ACF, treatment efficiency of DOC, $UV_{254}$, and $KMnO_4$ consumption ranged from 7 to 38%, 8 to 48%, and 16 to 66% respectively. These large deviations indicate the advanced processes of water treatment plants to be further optimized.

Assessment and Optimization of Granular Activated Carbon (GAC) Process in Water Treatment Process (입상활성탄 공정의 진단 및 효율적 운영방안: D 정수장을 중심으로)

  • Kim, Seong Su;Lee, Kyung Hyuk
    • Journal of Korean Society of Water and Wastewater
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    • v.19 no.6
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    • pp.781-790
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    • 2005
  • Granular Activated Carbon(GAC) is widely used in drinking water treatment. Many of the problems occurring in the GAC process are associated with the operation goal and performance. The purpose of this study were to evaluate the design, operation, and performance of granular activated carbon process in D water treatment plant. The optimal operation conditions of GAC process such as backwashing condition, granular activated carbon replacement time were discussed. The design, operation and performance of GAC process is influenced by their raw water characteristics and placement within the treatment process sequence. A critical analysis of plants experience and the information from the literature identifies the effectiveness of GAC process and indicates where modifications in design and operation could lead to improved performance. It would be useful to evaluate and optimize the GAC process in other treatment plant.

Advanced oxidation technologies for the treatment of nonbiodegradable industrial wastewater (난분해성 산업폐수 처리를 위한 고도산화기술)

  • Kim, Min Sik;Lee, Ki-Myeong;Lee, Changha
    • Journal of Korean Society of Water and Wastewater
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    • v.34 no.6
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    • pp.445-462
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    • 2020
  • Industrial wastewater often contains a number of recalcitrant organic contaminants. These contaminants are hardly degradable by biological wastewater treatment processes, which requires a more powerful treatment method based on chemical oxidation. Advanced oxidation technology (AOT) has been extensively studied for the treatment of nonbiodegradable organics in water and wastewater. Among different AOTs developed up to date, ozonation and the Fenton process are the representative technologies that widely used in the field. Based on the traditional ozonation and the Fenton process, several modified processes have been also developed to accelerate the production of reactive radicals. This article reviews the chemistry of ozonation and the Fenton process as well as the cases of application of these two AOTs to industrial wastewater treatment. In addition, research needs to improve the cost efficiency of ozonation and the Fenton process were discussed.