• Title/Summary/Keyword: 순환자원화

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A Case Study on the Estimation of the Resource Recovery Potentials by Landfill Mining (매립지 정비에 의한 순환이용 가능량 산정 사례 연구)

  • Yi, Sora;Lee, Woo Jin;Rhee, YoungJoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.26 no.1
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    • pp.5-12
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    • 2018
  • As many local governments have faced increasing conflicts on landfill use and the time of end use, it is difficult to provide an alternative landfill or conclude a consensus of lifespan extension for the existing landfill site. Therefore, the purpose of this study is to contribute improving of the landfill capacity by calculating the resource recovery potentials of landfilled waste previously and in the future by landfill mining. For this, rate of volume increase, weight ratio, and apparent density were adopted as major parameters and their values were calculated through previous cases. The rate of volume increase was calculated to 1.42 by averaging previous cases of three areas. The average weight ratio of soil matter was 45.6% by calculating for the three areas. For the combustible waste and incombustible waste, statistical data can be used. The apparent densities were divided by combustible waste, incombustible waste, and soil matter using an average of two areas value, i.e., $0.35ton/m^3$, $1.40ton/m^3$ and $1.58ton/m^3$. We analyzed the resource recovery potential of Cheongju landfill by using the estimated parameters. The additional landfill capacity was 45% of the existing landfill capacity by recovering landfilled waste by landfill mining. In addition, it is analyzed that the lifespan is extended to 20 years, if the combustible waste of new inputting waste is sorted and combusted for energy recovery and incineration ash, incombustible waste, and soil matter are only reclaimed into the existing Cheongju landfill. It is expected that the methodology and parameters of this study will be used as basic data when resource recovery potential is analyzed for another case study of landfill mining.

Information Management System of Solid Waste Landfill based on 3 Dimensional Method (3차원기법을 이용한 폐기물매립지 정보관리시스템 구축 연구)

  • Park, Jin-Kyu;Cho, Sung-Youn;Kim, Byung-Tae;Lee, Nam-Hoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.24 no.4
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    • pp.39-48
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    • 2016
  • An information management system for a solid waste landfill site was developed, in this study, to optimize the operation and management of solid waste landfill in real time in addition to provide the information of landfill status to the landfill operator, public official concerned and local residents. The landfill information management system is composed of two systems (Solid waste landfill history management system and landfill operation and performance management system). The solid waste landfill history management system based on automated RFID/LPR system allows landfill operators to provide information of waste collection vehicles and received waste. In addition, the system aids in the identification of 3-dimensional (3D) position for landfilled solid wastes. Using the landfill operation and performance management system based on 3D laser scanner delivers information about landfill volume, settlement, landfill density, and current landfill capacity to landfill operators in real time, resulting in optimum space utilization. Ultimately, this system would dramatically reduce exposure of landfill operators to hazardous materials and improve the productivity of landfill operations.

Investigation of Growth Characteristics of Salix gracilistyla Clones for Promoting Woody Biomass Resources (목질계 바이오매스 생산을 위한 갯버들의 생장특성)

  • Lee, Hyunseok;An, Chanhoon;Kang, Junwon;Lee, Wiyoung;Yi, Jae-Seon
    • Journal of Korean Society of Forest Science
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    • v.107 no.1
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    • pp.16-24
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    • 2018
  • This study was investigated to select superior population and clones of Salix gracilistyla for promoting woody biomass resources through creating of short rotation coppices (SRC). Plant materials were collected from seven different population groups of S. gracilistyla and planted at two different nursery sites in Chuncheon and Yongin. Height and root collar diameter showed statistically significant differeces among population, nursery, and annual growth for three years (p<0.01). Aboveground biomass was harvested to investigate dry weight after 3 years from planting, the Youngwol population showed the highest yield as $4.8kg\;DW\;plant^{-1}$ in Chuncheon nursery which was more than double yield compared to the other nursery planted plants. However, Hongcheon and Wonju populations as $3.3kg\;plant^{-1}$, showed the best yield in Yongin nursery. In addition, there was a significant difference between collected populations and nurseries. But there was statistically significant different interaction between population (Pop) and nursery (Nur) (F value = 3.51, p<0.01). Therefore, the superior populations selected by this experiment could be cultivated as an excellent variety for woody biomass resources through the clonal test.

Effect of Wet Milling on Scum Generation and Solubilization in Batch Ozone Reaction Using Digested Sludge (소화슬러지를 이용한 회분식 오존반응 시 습식분쇄가 스컴 생성과 가용화에 미치는 영향)

  • Hong, Seong-Min;Lee, Dong-Hoon;Kim, Choong-Gon;Shin, Hyun-Gon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.27 no.2
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    • pp.13-18
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    • 2019
  • Sewage sludge treatment is increasing every year due to improvement of living and urbanization. However, interest in anaerobic digestion which is one of the recycling technology. There is anaerobic digestion of increasing due to limitations of ocean dumping and final disposal. But, the limit of anaerobic digestion efficiency due to the advanced treatment of sewage has been limited, and studies for solubilization technology have been actively conducted. Therefore, in this study, we aimed to investigate the variation of generation of scum and the solubilization efficiency in the application of pre-treatment of ozone reaction and the change of properties of digested sludge with wet milling. There are results of VS/TS increased by 4.4% and $SCOD_{cr}/TCOD_{cr}$ increased by 9.4% by wet milling alone. In addition, the increase of the specific surface area due to which the reduction of the particle size of the solid content of the sludge in the ozone reaction caused by wet milling decreased the generation rate of scum at 14.3% and increased VS/TS at 2.1%, compared with the ozone reaction alone. From these results, it is expected that the application of wet milling can be increased the contact efficiency with solids in the sludge during ozone reaction with suppress scum and increase the efficiency of the subsequent process in anaerobic digestion.

Environmental impact of hydroponic nutrient wastewater, used hydroponic growing media, and crop wastes from acyclic hydroponic farming system (비순환식 양액재배에서 발생하는 폐양액, 폐배지, 폐작물이 환경에 미치는 영향)

  • Park, Bounglog;Cho, Hongmok;Kim, Minsang
    • Journal of the Korea Organic Resources Recycling Association
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    • v.29 no.1
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    • pp.19-27
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    • 2021
  • Hydroponic farming is a method to grow a plant without soil. Plants can be grown on water or hydroponic growing media, and they are fed with mineral nutrient solutions, which are fertilizers dissolved into water. Hydroponic farming has the advantage of increasing plant productivity over conventional greenhouse farming. Previous studies of hydroponic nutrient wastewater from acyclic hydroponic farms pointed out that hydroponic nutrient wastewater contained residual nutrients, and they were drained to a nearby river bank which causes several environmental issues. Also, previous studies suggest that excessive use of the nutrient solution and disposal of used hydroponic growing media and crop wastes in hydroponic farms are major problems to hydroponic farming. This study was conducted to determine the impact of hydroponic nutrient wastewater, used hydroponic growing media, and crop wastes from acyclic hydroponic farms on the surrounding environment by analyzing water quality and soil analysis of the above three factors. Three soil cultivation farms and several hydroponic farms in the Gangwon C region were selected for this study. Samples of water and soils were collected from both inside and outside of each farm. Also, a sample of soil and leachate from crop waste piles stacked near the farm was collected for analysis. Hydroponic nutrient wastewater from acyclic hydroponic farm contained an average of 402 mg/L of total nitrogen (TN) concentration, and 77.4 mg/L of total phosphate (TP) concentration. The result of TP in hydroponic nutrient wastewater exceeds the living environmental standard of the river in enforcement decree of the framework act on environmental policy by 993.7 times. Also, it exceeds the standard of industrial wastewater discharge standards under the water environment conservation act by 6~19 times in TN, and 2~27 times in TP. Leachate from crop waste piles contained 11,828 times higher COD and 395~2662 times higher TP than the standard set by the living environmental standard of the river in enforcement decree of the framework act on environmental policy and exceeds 778 times higher TN and 5 times higher TP than the standard of industrial wastewater discharge standards under the water environment conservation act. For more precise studies of the impact of hydroponic nutrient wastewater, used hydroponic growing media, and crop wastes from acyclic hydroponic farms on the surrounding environment, additional information regarding a number of hydroponic farms, arable area(ha), hydroponic farming area, seasonal, weather, climate factor around the river, and the property of the area and farm is needed. Analysis of these factors and additional water and soil samples are needed for future studies.

The Importance Analysis of Experts on Eco-Cultural Regeneration Index in Island Regions (도서지역의 생태문화적 재생 요소에 대한 중요도 분석)

  • Byun, Byung-Seol;Shin, Sun-Mi
    • Journal of Wetlands Research
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    • v.13 no.3
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    • pp.687-696
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    • 2011
  • This study induced ecological and cultural regeneration factors which can be introduced in island regions. And then, survey on recognition on importance was carried out with experts group. First of all, based on status and development trend of islands, farming and fishing village, ecological and marine city, eco-cultural regeneration factors fit to islands area were induced. Ecological regeneration factors were classified to land use, transportation system, buildings, and resources cycle. While cultural regeneration factors were classified to preservation, making tourism resources, and base facilities. This study compared recognition on importance by field such as occupation and major field. One-way ANOVA was used. As a result, this study compared recognition on importance about eco-cultural regeneration factors in island regions and suggested future direction.

Evaluation of Biological Organic and Nutrient Removal Performance in Intermittent MBR Systems by Computer Simulation (컴퓨터 시뮬레이션을 이용한 간헐폭기 MBR시스템에서의 유기물 및 영양염류 처리 성능 평가)

  • Yoo, Hosik;Rhee, Seung-Whee
    • Journal of the Korea Organic Resources Recycling Association
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    • v.21 no.3
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    • pp.82-92
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    • 2013
  • The Intermittent Aeration MBR systems have the advantage of controlling reaction time by changing aeration period and are one of economic BNR systems since these processes do not require MLSS recirculation that demands capital and operation costs. In this study, two intermittent aeration MBR systems were studied by computer simulation: an intermittent aeration MBR system that had both 1hr/1hr and 4hr/4hr aeration/unaeration periods at intermittent reactor and NEW INTERMITTENT-process that was an energy saving process and certified as a new process by Korean government. Since DO concentration reached only at 0.23mg/L at intermittent reactor when it was aerated, the Intermittent aeration MBR system having 1hr/1hr aeration/unaeration period showed simultaneous nitrification/denitrification and had the highest nitrogen and phosphorus removal efficiencies that were 57% and 55%, respectively. Since this study was based on the constant influent flow and characteristics, more studies are needed to define the operational characteristics of intermittent aeration MBR systems under dynamic influent conditions.

Characteristics of treatment by Electrolysis with a change of electrodes in sanitary landfill leachate (전기분해법에서의 전극변화에 따른 위생매립장 침출수의 처리특성)

  • Huh, Mock;Kim, Byung-Hyun;Kim, Gwang-Jin
    • Journal of the Korea Organic Resources Recycling Association
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    • v.10 no.1
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    • pp.68-74
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    • 2002
  • This study was performed to examine the availability of electrolysis for removal of remaining biologically refractoty humus and residual color of leachate which is biologically pretreated in domestic waste matter sanitary landfill by recycling to landfill. The obtained results were as follows; 1) The electrolysis of leachate through covered bed represented that the removal efficiency of CODcr and color range from 70~80%, in color removal the only electrolysis for a treatment of leachate meet the critia of effluent. 2) The highest removal efficiency was represented in pH 7~8. 3) At anode used Al, Fe, Stainless the removal efficiency of CODcr and color was high in order of Fe, Al, stainless, in considering the settled ability of reaction product in economic or after electro coagulation the removal efficiency was highest when anode was the Fe electrode. 4) In this study conditions for removed both CODcr and Color ar the same time represented thar anode was used Fe, electrode-distance was 2cm and reaction time was 40min in 8volts.

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A Study on the 2-stage dry and pyrolysis system for reduction of sewage sludge (하수슬러지 감량화를 위한 one구동 2단형 열풍건조/열분해에 관한 연구)

  • Ha, Sang-An;Kim, Seung-Ho
    • Journal of the Korea Organic Resources Recycling Association
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    • v.12 no.2
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    • pp.52-60
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    • 2004
  • The basic approach to sewage sludge is organic waste minimization, promotion of energy recovery; volume and weight reduction by final treatment, and environmentally final disposal of natural circulation. Dry and pyrolysis of maize was experimentally investigated in full-scale rotary kiln in semi-continuous operation. The operational parameters varied are the operating temperature $160{\sim}175^{\circ}C$ of dry and $450{\sim}800^{\circ}C$ of pyrolysis, the solids residence time 9 min for pyrolysis. Important parameters studied include the running time, water content of sewage sludge, solids amount of sewage sludge(TS%) by the varied temperature. Also, with the increasing of temperature, how the yield of oil and char product change was observed, and the distribution of gas production components was observed. The gas of $C_1{\sim}C_3$ yield increased and oil of $C_4{\sim}C_6$ yield decreased along with pyrolysis temperature of $670^{\circ}C$ by the run time of 9 min.

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Biogas Resource from Foodwaste Leachate Using UASB(Upflow Anaerobic Sludge Blanket) (UASB를 이용한 음폐수의 Biogas 자원화)

  • Min, Boo-Ki;Lee, Chang-Hyun;Kim, Jae-Yong
    • Applied Chemistry for Engineering
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    • v.23 no.1
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    • pp.28-34
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    • 2012
  • In this study, we operated a UASB (upflow anaerobic sludge blanket) reactor by using foodwaste leachate as a raw material with the method of Mesophilic Digestion ($35{\pm}0.5^{\circ}C$) and Thermophilic Digestion ($55{\pm}0.5^{\circ}C$). During 20 days of operating time with the Mesophilic Digestion, the recirculation ratio of effluent was stepwisely changed in every five days. Thermophilic Digestion was carried out at the same condition for Mesophilic Digestion. Results showed that the organic removal efficiency of Mesophilic Digestion was over 90% and the yield of methane production was from 66 up to 70%. The organic removal efficiency of Thermophilic Digestion was over 80% and the yield of methane production was between 62 to 68%. Also, when UASB reactor was operating to over the 3Q effluent recirculation, the experiment could be carried out economically and stably.