• Title, Summary, Keyword: municipal solid waste

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Investigation of Characteristics of Incinerator Bottom Ash and Assessment for Recycle due to the Change of MSW Composition (생활폐기물 성상변화에 따른 소각시설 바닥재의 특성 변화와 시멘트 클링커 원료로 재활용 가능성 평가)

  • Lee, Woo Chan;Shin, Deuk Chol;Dong, Jong In
    • Applied Chemistry for Engineering
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    • v.25 no.1
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    • pp.103-106
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    • 2014
  • Recycling of bottom ash from municipal solid waste (MSW) incinerator has been strictly limited due to its composition of high level chlorine and other unfavorable substances. The composition of MSW has been, however, changed after the introduction of garbage-bag sales system, extended producer responsibility (EPR) policy and the prohibition of direct landfill of food waste. Recent waste shows reduced moisture and chlorine content, increased calorific value due to the separation of food waste, incombustible materials and PVC. The main purpose of this study is to investigate the trend of composition changes of MSW incinerator bottom ash and to compare the analytical results with those before the separation system was introduced. CaO content of bottom ash, one of the major component of cement clinker, increased from 26.7% in 2001 to 34.0% in 2006. The chlorine content showed a dramatic decrease from 1.84% in 2001 to 0.00655% in 2006, which is closely compatible with that of the fly ash of coal-utilizing thermal power plants, which is mainly due to the changes of MSW composition. It is eventually considered that there is a possibility of utilizing the incinerator bottom ash as a raw material of cement clinker feed substances.

A Study on the PCDDs/PCDFs Contents in the Flue Gas of Muncipal Solid Waste Incinerator(III) -Emission Concentration Varying the Combustion Temperature- (쓰레기소각로 배출가스의 PCDDs/PCDFs 함유량에 관한 연구(III) -소각로 연소 온도변화에 따른 보일러 후단에서의 배출 농도 변화-)

  • Shin, S.K.;Chung, Y.H.;Lee, J.I.
    • Analytical Science and Technology
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    • v.12 no.6
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    • pp.540-549
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    • 1999
  • The combustion temperature was controlled between $880^{\circ}C$ to $1070^{\circ}C$ to find the relation the combustion temperature and emission amount of PCDDs/PCDFs in the Municipal solid waste incinerator. The emission amount of PCDDs/PCDFs decreased when the temperature increased in the rear of the boiler. The PCDDs/PCDFs concentration were detected $7.82ng-TEQ/Nm^3$ at $880^{\circ}C$, $6.97ng-TEQ/Nm^3$ at $970^{\circ}C$ and $6.13ng-TEQ/Nm^3$ at $1070^{\circ}C$. Also, The chlorophenols, chlorobenzenes, and PCB concentration decreased by increasing the temperature from $880^{\circ}C$ to at $1070^{\circ}C$, and the isomer of the prescsors had a tendency to emit the higbly cbiorinated compounds.

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Preparation of KCl through Removal of Heavy Metals from Chlorine By-Pass Dust (염소 바이패스 더스트를 이용한 염화칼륨 제조 및 중금속 제거)

  • Yun, Youngmin;Yeom, Nari;Lee, Kabsoo;Eom, Seonhui;Lee, Yonghyun;Chu, Yongsik
    • Journal of the Korean Institute of Resources Recycling
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    • v.26 no.2
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    • pp.11-17
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    • 2017
  • Many problems are occurred by using industrial by-product and municipal solid waste in the cement manufacturing process. The main components of chlorine by-pass dust generated by the use of the wastes are $K^+$, $Cl^-$, and a slight amount of heavy metals is also contained. In terms of waste recycling, it is necessary to eliminate the heavy metals. Therefore, in this study, the experiments for the removal of heavy metals from KCl which was produced by chlorine by-pass dust were conducted. In order to find optimum conditions for the removal of heavy metals, we have controlled the amount of water and precipitator. The type and concentration of heavy metals in KCl were analyzed. The concentration of heavy metals decreased as amount of precipitator increased. The heavy metals such as Pb, Cd, and As were not detected in dust A and B, when the mixing ratios between dust A(B) and water were controlled to be 1:2 (1:2, 1:3.5) with the addition of 3% precipitator (NaOCl).

Evaluation of Resource Recovery from Sorted Waste by MBT System (MBT시스템에 의해 선별(選別)된 생활폐기물(生活廢棄物)의 자원화(資源化) 평가(評價)에 관(關)한 연구(硏究))

  • Lee, Byung-Sun;Han, Sang-Kuk;Lee, Nam-Hoon;Kang, Jeong-Hee;Wie, June
    • Journal of the Korean Institute of Resources Recycling
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    • v.22 no.5
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    • pp.20-28
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    • 2013
  • This study was carried out to evaluate the possibility of resource recovery for municipal solid waste(MSW) that sorted by a MBT system. First, physical property of MSW was similar to wastes carried into Sudokown landfill site. However, moisture of MSW was little higher than that. As a result of BMP test using organic fraction of MSW(OFMSWs), approximately 60 ~ 80 mL $CH_4/g$-VS of methane was occurred. Compared to the other studies, the value of methane is lower. It seems to be caused that high ratio of vinyl/plastic in OFMSWs. The other BMP test using sample of MBT system located in Sudokwon landfill was conducted each physical properties. According to the result of experiment, food waste makes 193 mL $CH_4/g$-VS, and paper is 102 mL $CH_4/g$-VS. However, there was not methane production in vinyl and rubber. Additionally, others that can't sort no more show 30 m $CH_4L/g$-VS of methane production. From the result of experimental data OFMSWs has high fraction of vinyl, rubber and other substance that difficult for biodegradation. Therefore it is need to sort of them.

The Effect of Column Process on the Treatment of Municipal Solid Waste Leachate (Column 장치를 이용한 도시쓰레기 침출수의 처리효과)

  • Han, Mun-Gyu;Cho, Ju-Sik;Lee, Hong-Jae;Heo, Jong-Soo
    • Korean Journal of Environmental Agriculture
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    • v.11 no.3
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    • pp.201-208
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    • 1992
  • Municipal landfill leachate, a major source of soil contamination and ground water pollution, causes serious environmental problems. To investigate the removal efficiency of pollutants in the leachate by sand, briquet ash, fly ash, and activated carbon columns, COD and some pollutants in the leachate passed through each column for 8 weeks were examined. Average COD removal efficiency for 8 weeks was 83%, 45%, and 43% by activated carbon, briquet ash and fly ash columns, respectively. COD was not effectively reduced by sand column. Average ${NH_4}\;^+$ removal efficiency for 8 weeks was more than 60% by ail columns. Hardness was effectively removed for 8 weeks by fly ash and activated carbon columns. Anoins including $PO_4\;^{3-}$, $CI^-$ and $SO_4^{2-}$ were not removed by all columns.

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Theoretical Formulation of Porous Medium Behavior Depending on Degree of Saturation (포화도에 따른 다공질 매체 거동의 이론적 정식화)

  • Park, Tae Hyo;Jung, So Chan;Kim, Won Cheul
    • Journal of the Korean Geoenvironmental Society
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    • v.2 no.3
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    • pp.81-88
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    • 2001
  • The behavior of porous medium is modeled by linear thermoporoelastic behavior, linear poroviscoelastic behavior, poroplastic behavior, and poroviscoplastic behavior, etc. The behavior has, in general, a complicated aspect which makes a mechanical description of the problem with time. Constitutive modeling for deformation behavior of porous medium with coupling effects is needed since there is interaction between the constituents in pores with a relative velocity to each other. In this work, it is explained 3-dimensional behavior depending on degree of saturation for porous medium composed of homogeneous, isotropic materials. It is obtained the governing equations based on continuum porous mechanics. In addition, it is developed constitutive model which can be understood of behavior for porous medium which can be understood, analysed behavior of porous medium. It can be accomplished exact analysis and prediction of behavior in porous medium. The behavior for porous medium is analysed exactly, and the prediction of deformation behavior is accomplished. Consequently, it will be basis to analyze 3-dimensional behavior in municipal solid waste landfill, and the practical using of porous medium ground which are composed of nonhomogeneous, anisotropic materials can be done widely.

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Elemental Analysis of Bottom Ash from Incinerator by Neutron Activation Analysis (중성자 방사화분석법을 이용한 소각로 바닥재의 원소분석)

  • Moon, Jong-Hwa;Kang, Sang-Hoon;Kim, Sun-Ha;Chung, Young-Sam
    • Analytical Science and Technology
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    • v.16 no.5
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    • pp.418-425
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    • 2003
  • Inorganic elemental content of bottom ash generated from municipal solid waste incinerator was determined by neutron activation analysis. Bottom ash samples were collected monthly from incinerator located in city D, strained out by the 5 mm sieve, dried by oven and pulverized by agate mortar. The samples were irradiated at NAA #1 irradiation hole in HANARO research reactor of Korea Atomic Energy Research Institute and the irradiated samples were measured by HPGe-gamma-ray spectrometer. From the activity of measured nuclides, 33 elements including As, Cr, Cu, Fe, Mn, Sb and Zn were determined applying activity creation formula and nuclear data. The quality control was conducted by simultaneous analysis with NIST standard reference materials.

A Fundamental Study on Biogas from Municipal Solid Waste (도시(都市) 폐기물(廢棄物)로부터 Biogas 생산(生産)에 관한 기초적(基礎的) 연구(研究))

  • Choi, Eui So;Lee, Jung Jun
    • Journal of The Korean Society of Civil Engineers
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    • v.7 no.4
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    • pp.31-40
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    • 1987
  • To evaluate the fundamental factors in the recovery of biogas from the landfills composed of about 40% of volatile solids, the experiments for the samples from the operating landfill site as well as from the laboratory-scale lysimeter were undertaken. In the test of landfills, the change of moisture content, the content of volatile solids (VS), the ratio of saccharide to ligin(Y) and the estimation of landfills reclaimed and the correlationship between VS and Y were investigated. During the experiments with laboratory-lysimeter, temperature, pH, gas production rate, the composition of gas were measured. The mathematical model derived from the the rate coefficient of gas production(k) were proposed from the results of this investigation. Furthermore, the proposed mathematical model from this study was verified with the obtained values from experiments.

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Evaluation and improvement of the stabilization process of the MSW Incinerator fly ash into cement (시멘트를 이용한 소각비산회의 안정화공정에 따른 문제점과 해결방안)

  • 배해룡
    • Journal of environmental and Sanitary engineering
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    • v.16 no.2
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    • pp.63-70
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    • 2001
  • This study was initiated to evaluate and resolve the potential problems caused as the MSWI(Municipal Solid Waste Incinerator) fly ash were stabilized and solidified into the cement. The physical and chemical properties of fly ashes (K and M) used in this study were fixed according to the operating conditions of the incineration plant. The compressible strength of the solidified matrix used in this study were measured at 7, 28, and 56 curing days, respectively, to evaluate the stability of the solidified matrix, which were further analyzed by XRD and SEM. The experimental results obtained in this study showed that the relatively long hours of curing periods were needed to solidify the fly ash. The solidified matrix containing K ash had the high and excellent compressible strength of $200{\;}kg/\textrm{cm}^2$, after 56 curing days, but was not good enough in appearance. The analytical data by SEM confirmed that the alkaline Na and K, which are highly dissolved in water, were included in the fly ash and evenly distributed into the exterior surface of the solidified matrix. Whereas, the solidified matrix containing M ash never showed such a compressible strength as shown in the K ash due to the severe fracture, even as early as 7 curing days. Based on its XRD analysis, it appeared that both $C_2S$ and $C_3S$ highly related to the compressible strength were not crystallyzed into the solidified matrix. However, the compressible strength of the solidified and cemented M ash was remarkably improved by 100 times, after the alkalinity was washed out, which indicated that it is equivalent to 30 to 40g per one kg of fly ash.

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A Study on Separated Collection and Recycling in Apartment Housing Areas in Taegu Metropolitan City (대구시 아파트지역의 분리수거 및 재활용에 관한 연구)

  • 우형택;곽형숙
    • Journal of Environmental Science International
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    • v.4 no.3
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    • pp.153-167
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    • 1995
  • Recycling is receiving increasing social attention today as our nation begins to grapple with the significant problems caused by huge amount of municipal solid waste. The topic of recycling is not simple but extremely complicated. This study attempts to provide basic data and policy options for expanding and improving separated collection and recycling in public residential areas, through three case study of apartment housing areas in Taegu Metropolitan City. The main results of this study are summarized as follows. For the significant period of time, all three case areas had in common the extreme difficulty in establishing and operating the system of connecting public participation, collection and storage, transportation, and actual recycling of materials because of a variety of problems involved in this process. Both amounts of and prices for collected materials fluctuated considerably over time mainly due to monthly changes in recyclable home materials and the dynamic nature of recycling markets. Public questionnaire survey revealed the very high level of participation in separated collection, not only because almost all respondents well understood the necessity and importance of recycling, but because they also knew how to do separated collection. But overall activities were rated low and most respondents suggested the enlargement of public participation, the improvement of collection and storage facilities, and collection transportation networks. In particular, most respondents had little experience of using recycled Products and used mainly reproduced soap and bathroom tissue. Furthermore, they were considerably unsatisfied with low variety and quality of recycled products, their high prices and low availability in the market. Finally potential policy options and activities for improving separated collection and recycling are suggested.

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