• Title/Summary/Keyword: Linked Treatment

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Evaluation of the impact of sewage treatment plants in the Linked treatment through the sewage treatment computer simulation program (하수처리 전산모사 프로그램을 통한 연계처리시 하수처리장 영향 평가)

  • Kim, Sungji;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.22 no.4
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    • pp.321-327
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    • 2020
  • Recently The amount of wastewater and linked wastewater is being increased every year due to industrial development, population growth, and improvement in living standards. Linked wastewater shows the feature-low flow rate and high concentration. Therefore, it has been shown that it has a great impact on the operation of the sewage treatment plant and costs a lot for treating linked wastewater. In this study, a scenario with low increase of water quality when the total amount of the inflow of linked wastewater was entered into individual reactors is obtained. According to the result of modeling, The effluent water quality get the least increment once the water was introduced into the influent and anoxic tank. We generated the various scenarios Based on these results. scenarios are varying according to inflow from linked waste water's distribution ration. As a result of modeling through various scenarios, it was found that the increment of TN and TP were at the least when the inflow of linked water was distributed with ratio between sewage (80%) and oxygen-free tank (20%).

Determination of Optimal Livestock Wastewater Treatment Process for Linked Treatment in Sewage Treatment Plant (하수처리장 연계처리를 위한 가축분뇨 최적 처리공정 선정에 관한 연구)

  • Kim, Choong Gon;Shin, Hyun Gon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.20 no.3
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    • pp.52-59
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    • 2012
  • As the result of reviewing the linked treatment of water quality for treating process at public livestock wastewater treatment facilities for fair selection of the proper linked process in case of linking sewage treatment plant for livestock wastewater, in case of wastewater processed by bio-reactor that is only biologically-treated, the load factor showed relatively high as 1.67%(base on design quality), 2.59%(base on operation quality) regarding COD and 3.69%(base on design quality), 7.67%(base on operation quality) regarding $COD_{Mn}$ but it is judged that there is nearly no influence on the operation of sewage treatment plan. And, in case of oxidized flotation-treated water & biofiltlation-treated water that are the advanced wastewater treatment, the load factor is approximately 1% and there is concern about the installation of excessive facilities in case of installing the advanced wastewater treatment. So, in case of considering the economic efficiency & stable operation of sewage treatment plant S, it is judged to be desirable to link with wastewater processed by bio-reactor that is biologically-treated.

Optimization of Operating Conditions for Each Linked Treatment Scenario using Sewage Treatment Modeling (하수처리 모델링을 이용한 연계처리 시나리오별 운전조건 최적화)

  • Kim, Sungji;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.23 no.1
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    • pp.7-13
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    • 2021
  • Due to rapid industrial development, population growth, and improvement of living standards, the amount of sewage and wastewater, including nutrients, is increasing every year. In addition to the increasing amount of sewage and wastewater generation, untreated linked treated water (manure, livestock manure, industrial wastewater, leachate, food waste) is also increasing, and many of the linked treated water flows directly into nearby sewage treatment plants. The associated treated water causes many problems because of its own characteristics, low flow rate with high concentration compared to existing inflow sewage. In order to solve this problem, it is necessary to investigate the quantity and quality of the connected treated water whichh is flowed into the sewage treatment plant, and a study the effect on sewage treatment. Therefore, in this paper, we would like to examine the effect of the linked treated water. Seasonal effect associated with water pollution conditions was considered. In addition, a scenario was created through the distribution and inflow of connected treated water along with the water temperature conditions. Through scenario analysis, we intend to optimize the operating conditions of linked processing.

Analysis of Proper Linked Treatment Load Using GPS-X Simulation (GPS-X 시뮬레이션을 이용한 적정 연계처리부하량 분석)

  • Kim, Sungji;Lee, Jiwon;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.21 no.3
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    • pp.244-250
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    • 2019
  • Due to the industrial development and population growth, it has recently been shown that there are many problems caused by the rinked treatment water in local goverments and sewage treatment plants. The rinked treatment water has a characteristic of low flow rate and high concentration unlike general sewage. These characteristics increase sewage treatment difficulty and sewage treatment fee of sewage treatment facilities. Among the many influencing factors that increase sewage treatment unit cost, 'linked treatment load/design inflow load (%)' was derived as the most correlated factor. Through the selection and modeling of sewage treatment plants, the excess scope of design discharge water quality was investigated under the conditions of temperature and the conditions of 'linked treatment load/design inflow load (%)' taking into account the effects of the four seasons. The study found that for TN, 'linked treatment load/design inflow load (%)' was 19.7%, 22.6%, 25.1%and 27.7%, respectively, under conditions of $5^{\circ}C$, $10^{\circ}C$, $20^{\circ}C$ and $25^{\circ}C$. In case of TP, 'rinked treatment load/design inflow load (%)' was 10.7%, 12.2%, 15.6% and 17.5% at $5^{\circ}C$, $10^{\circ}C$, $20^{\circ}C$, and $25^{\circ}C$, respectively, under conditions of $5^{\circ}C$, $10^{\circ}C$, $20^{\circ}C$ and $25^{\circ}C$.

Characteristics of porous Chitosan-Alginate-Gelatin Scaffold Cross-linked by Heat-treatment (열처리에 의해 가교된 다공성 키토산-알지네이트-젤라틴 지지체의 특성)

  • Sin, Byeong-Cheol;Choe, Min-Su;Han, Hui-Dong;Seong, Ha-Su
    • Journal of the Korean Chemical Society
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    • v.50 no.3
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    • pp.224-231
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    • 2006
  • agents used for enhancing mechanical properties of porous natural scaffolds, reduces biocompatability of the scaffolds, due to their inherent cytotoxicity. In this study, scaffolds which was composed of chitosan, alginate and gelatin were cross-linked by using heat treatment instead of cross-linking agent and mechanical properties of the cross-linked scaffold were investigated. Fourier transform infrared spectroscopy (FT-IR) analysis confirmed that cross-linking of heat-treated scaffold was formed via amide or ester linkage between the polymer chains. The heat-treated scaffold had interconnected pores with mean diameter of 100~200 m and showed more than two fold increase of water uptake in comparison with chemically cross-linked scaffold. Tensile strength of the heat-treated scaffold increased up to 130% compared to non cross-linked scaffold and average maximum elongation was 11.3%. The porous cross-linked scaffold with the improved mechanical property may be suitable as a biocompatable scaffold for tissue engineering.

Suggestions for Cost Improvement of High concentration Linked Treatment in Municipal Wastewater Treatment Plant (하수처리장에서의 고농도 연계처리수에 대한 요금 개선 제안)

  • Lee, Jiwon;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.22 no.2
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    • pp.92-99
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    • 2020
  • Linked treatment refers to a system that relieves the burden of the business by linking high concentrations of wastewater such as human waste, manure, leachate, and other industrial wastewater to nearby municipal wastewater treatment plants(MWTPs). In 2018, 187 MWTPs, which are about 4.5% of the total domestic MWTPs, have implemented a linked treatment system, but local governments are having difficulties in operating sewage treatment due to lack of reasonable cost estimation standards. Therefore, we proposed an improvement plan to solve the problem in the calculation method that currently imposes linked wastewater. To this end, the effects and correlations of the linkage treatment system on the sewage treatment unit were analyzed, and among them, the main factors with the highest correlation were applied to the improvement plan. As a result, an improvement plan that improved three parts of the existing calculation method was presented, and the calculation method and the calculation case using the existing literature values were also presented. This can be used as a basis for future reference by local governments to implement linkage treatment, and to revise local sewerage ordinance and is believed to be helpful in operating a rational linkage system.

A Study on the Effect of Chemical Pretreatment for Livestock Wastewater on the Linked Treatment of Sewage (축산폐수 처리 시 화학적 전처리가 연계처리에 미치는 영향 연구)

  • Han, Jun-Suk;Han, Gee-Bong
    • Journal of the Korea Organic Resources Recycling Association
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    • v.18 no.1
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    • pp.89-97
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    • 2010
  • In this study, to investigate the effect of chemical pretreatment for livestock wastewater, laboratory scale test for ozonation and linked treatment of sewage were conducted. and the results were obtained as follows. The ozonation of livestock wastewater showed the COD removal rate per hour to be 17%, 78% and 62% at each pH 4, 7 and 10, respectively. With transformation of NBDCOD to biodegradable BDCOD by ozonation, the ratio of SCODcr/TCODcr was increased from 26% to 38%. Accordingly, pretreatment of livestock wastewater affected to the biological post treatment process to elevate removal efficiency by transformation of nonbiodegradable mass to biodegradable mass. As the results of linked treatment of pre-ozonated livestock wastewater and sewage in the MLE process, the treatment efficiencies of TCODcr 93.8%, T-N 74.3%, T-P 89.7%, SS 97.5% were earned at 100% of internal recycle rate. When the internal recycle rate was increased to 150%, the treatment efficiencies of TCODcr 94.5%, T-N 54.5%, T-P 70.8%, SS 98.5% were earned. Also the removal efficiencies of TCODcr 92.6%, T-N 83.1%, T-P 81.9%, SS 98.5% were earned as the internal recycle rate was increased to 200%. Especially, nitrogen removal efficiency in the linked treatment showed 74.3%, 54.5%, 83.1% at 100%, 150% and 200% of internal recycle ratio, respectively, which revealed the tendency of higher removal efficiency than that of sewage treatment.

Suggestions for Cost Improvement of High concentration Linked Treatment in Municipal Wastewater Treatment Plant (하수처리장에서의 연계처리수 요금 개선에 따른 경제성 분석)

  • Lee, Jiwon;Gil, Kyungik
    • Journal of Wetlands Research
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    • v.22 no.2
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    • pp.139-144
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    • 2020
  • Recently, high-concentration linked wastewater has been introduced into a nearby municipal wastewater treatment plants(MWTPs), but it is difficult to MWTP in local governments due to an unreasonable linked treatment charge system, and there is insufficient evidence or data to prove this. However, the MWTP, which is a national essential infrastructure, is generally exempt from the preliminary feasibility study, so there have been no cases where economic evaluation was conducted. Therefore, we proposed an improvement plan that can compensate for the disadvantages of the existing linked processing charges through previous studies. In this study, a comparative evaluation of how much economic feasibility can be improved compared to the existing ones when applying the improvement plan by conducting an economic analysis. For this, reference was made to the preliminary feasibility assessment data of the existing environmental facilities and the cost factors and benefit factors established during the modernization of the old sewage treatment facilities. As a result of the study, the B/C(Benefit/cost) value was quite low in the past, but when the improvement proposal proposed by the researchers was applied, it was confirmed that the B/C value increased close to 1. Therefore, it is considered to be very reasonable to calculate the linkage processing charge according to the linked wastewater load proposed by the researchers.

Characterization of Oilgosaccharide Moieties of Rat Intestinal Phytase

  • Yang, Won-Jin;Kim, Kil-Woong
    • Archives of Pharmacal Research
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    • v.17 no.5
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    • pp.309-313
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    • 1994
  • Phytase of rat intestine had a large amount of oilgosacchanrides ; The enzyme consisted of two different subunits with the molecular weights of 90 KDa and 70 KDa in its intack form, whereas the apparent molecular weights tumed to 72 KDa and 52 KDa, respectively, after deglycosylation. The treatment with glycopeptidase F reduced the molecular weights from 90 KDa and 70 KDa to 83 KDa and 52 KDa, respectively, While endoglycosidase H caused no change in their molecular weights. These results indicate that the 70KDa subunit contains only the N-linked oilgosaccharide chains, while the 90KDa subunit ocntains O-linked oilgosaccharides as well as N-linked ones. Enzyme-linked lectin assays suggeted that bisecting N-acetyl-D-glucosamine and galactose 1-4 N-acetyl-D-glucosamine structures were present and that fucose was included in these oilgosaccharide moieties. Sialic acid was not found in either subunit.

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Improving the Reactivity and Harmlessness of Recalcitrant Contaminants by Reduction-oxidation-linked Process (환원-산화 연계처리를 통한 니트로벤젠의 반응성 향상 및 무해화 연구)

  • Kwon, Hee-Won;Hwang, Inseong;Kim, Young-Hun
    • Journal of Environmental Science International
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    • v.29 no.12
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    • pp.1205-1211
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    • 2020
  • In this study, the applicability of reduction-oxidation-linked treatment was evaluated for nitrobenzene and a by-product by analyzing the reaction kinetics. Nitrobenzene showed very low reactivity to persulfate that was activated using various methods. Nitrobenzene effectively reacted through the reduction process using Zero-Valent Iron (ZVI). However, aniline, a toxic substance, was produced as a by-product. Reduction-oxidation-linked treatment is a method that can allow the oxidative degradation of aniline after reducing nitrobenzene to aniline. The experimental results show improved reactivity and complete decomposition of the by-product. Improved reactivity and decomposition of the by-product were observed even under conditions in which the reduction-oxidation reaction was induced simultaneously. No activator was injected for persulfate activation in the process of reducing oxidant linkage, and the activation reaction was induced by ferrous iron eluted from the ZVI. This indicates that this method can be implemented relatively simply.