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한국폐기물자원순환학회> 한국폐기물자원순환학회지> 고온 호기성 소화를 통한 하수 슬러지 처리 시 고형물 및 용존성 유기물의 변화 양상

KCI등재

고온 호기성 소화를 통한 하수 슬러지 처리 시 고형물 및 용존성 유기물의 변화 양상

Solid and Soluble Organic Compounds Changes During Thermophilic Aerobic Digestion of Sewage Sludge

심소영 ( So Young Sim ) , 왕지유 ( Zhi Rou Wang ) , 장현민 ( Hyun Min Jang )
  • : 한국폐기물자원순환학회
  • : 한국폐기물자원순환학회지 38권6호
  • : 연속간행물
  • : 2021년 12월
  • : 529-534(6pages)
한국폐기물자원순환학회지

DOI

10.9786/kswm.2021.38.6.529


목차

I. 서 론
II. 연구방법
III. 결과 및 고찰
IV. 결 론
사 사
References

키워드 보기


초록 보기

Over the past decade, thermophilic aerobic digestion (TAD) has been considered a practical approach to treating highstrength wastewater because of its several advantages. In this study, batch-mode TAD of sewage sludge was conducted using a lab-scale bioreactor to evaluate the changes in solid and soluble organic compounds. The TAD process achieved rapid degradation of the solid compound at 55oC. The removal efficiency of volatile suspended solids (VSS) increased rapidly at the early operation stage and achieved 25% at 48 h. Then, the VSS removal efficiency increased gradually up to approximately 40% at the end of the digestion (168 h). As a result of VSS degradation, the soluble chemical oxygen demand (SCOD) increased significantly up to 12 g/L at 36 h and then showed a slow decline pattern. Furthermore, the pattern of protease activity was similar to that of the SCOD. This result indicates that the rapid degradation of VSS is highly linked to the increase of protease activity and thermophilic conditions. This study used acetic acid and propionic acid. The variation patterns were similar under both acetic acid and propionic acid. The concentrations of acetic acid and propionic acid rapidly increased up to 3.05 g COD/L at 48 h and 2.51 g COD/L at 36 h, respectively. Then, major volatile fatty acids concentrations declined sharply and became undetectable after 144 h. Similar to the SCOD variation pattern, the soluble total nitrogen and NH4+-N also decreased sharply after 72 h. This might be because ammonia stripping is enhanced by pH rising and continuous aeration during the TAD.

UCI(KEPA)

I410-ECN-0102-2022-500-000970840

간행물정보

  • : 공학분야  > 환경공학
  • : KCI등재
  • :
  • : 격월
  • : 2093-2332
  • : 2287-5638
  • : 학술지
  • : 연속간행물
  • : 1984-2022
  • : 2943


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1고형 폐기물에 포함된 무기물의 냉각 포집에 관한 실험적 연구

저자 : 윤주형 ( Joohyeong Yoon ) , 김상범 ( Sangbum Kim ) , 김종수 ( Jongsu Kim ) , 구본진 ( Bonjin Koo ) , 김범종 ( Beomjong Kim ) , 류태우 ( Taeu Yu )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 87-95 (9 pages)

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Combustible solid waste usually contains inorganic elements and compounds such as solid oxides (e.g., SiO2, Al2O3, TiO2, and Fe2O3), alkali metals (e.g., Na, K, Mg, Ca, and Cs), and non-metals (e.g., S, P, and Se). When this waste is treated using thermal conversion processes such as combustion, gasification, or pyrolysis, the removal of inorganic substances depends on the process operating conditions. In this study, inorganic elements with a low melting temperature (S, Se, and Cs) were studied experimentally to analyze their evaporation process during thermal conversion and their cooling while passing through a gas-cleaning facility followed by collection in a filter. In the experiments, S, Se, or Cs (as a compound of CaNO3) was mixed with combustible solid waste and fed into an electric heater with N2. The proportion of these elements that were evaporated, condensed, or collected by filters installed in a post-cleaning system was then measured. It was found that the evaporation rate for S, Se, and Cs depends on the interaction between the vapor pressure and molecular weight. The amount of inorganic particles decreased linearly with the ratio of the wire temperature to the boiling temperature. In addition, the amount of Cs particles was higher than that of S and Se. This is because Cs has a much lower vapor pressure and thus condenses earlier on the reactor wall than S and Se at the same temperatures.

KCI등재

2포장재 EPS의 물질흐름분석과 재활용에 따른 온실가스 감축량 산정 연구

저자 : 임진홍 ( Jin Hong Im ) , 장용철 ( Yong-chul Jang )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 96-109 (14 pages)

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Many synthetic resins manufactured using foaming polystyrene (PS) have been reported, including expanded PS (EPS), a thermoplastic polymer widely used in insulation, packaging, aquaculture floats, and buoys. There has been increasing demand for packaging EPS in recent years due to the growth of online shopping and food delivery markets. However, if not adequately managed, EPS decomposes into microplastics, adversely affecting human health and the ecosystem. In this study, the material flow of EPS packaging in Korea was analyzed quantitatively according to its life cycle. In addition, greenhouse gas emissions reduction from recycling EPS was estimated using the US EPA waste reduction model WARM. In 2019, approximately 47,000 tons of EPS were sold and ultimately discharged into plastic waste streams. About 42,000 tons were recycled, of which 40,000 tons (96%) were recycled as ingots, 287 tons as pellets, and 1,521 tons as a fireresistant coating for steel frames. As a result of this recycling, 62,700 tons of CO2eq was reduced in 2019, while the cumulative greenhouse gas reduction from 2003 to 2019 was estimated to be about 592,000 tons of CO2eq. This study demonstrated the potential benefits of minimizing environmental emissions and reducing greenhouse gases through recycling. However, more detailed research is needed to ensure more effective EPS packaging management and thus further minimize potential environmental impacts and microplastic pollution, including investigations into the impacts of restrictions and bans and the consequences for marine littering.

KCI등재

3한우와 젖소 분뇨의 계절별 물리화학적 성상 및 생화학적 메탄 잠재량 변화

저자 : 김승환 ( Seunghwan Kim ) , 이창민 ( Changmin Lee ) , 김준현 ( Junhyeon Kim ) , 조흠 ( Xin Zhao ) , 이상명 ( Sang Myung Lee ) , 이승철 ( Seung Chul Lee ) , 김재영 ( Jae Young Kim )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 110-116 (7 pages)

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The livestock industry produces large volumes of cattle manure, which can be used as an organic fertilizer after composting and renewable energy after anaerobic digestion. In the anaerobic digestion process, cattle manure is usually stored in a cowshed until it is transferred to treatment facilities, and its physicochemical characteristics vary depending on this storage environment. Any change in these characteristics acts as a source of instability in the operation of an anaerobic digester. This study investigated the physicochemical characteristics and biochemical methane potential of cattle manure between seasons. The total solid content of Hanwoo (Korean beef) cattle manure and dairy cattle manure was 29.1 ~ 33.8 and 21.1 ~ 29.5% (by wet wt.), respectively, while the biochemical methane potential was 113.3 ~ 180.8 mLCH4/g-VS for Hanwoo cattle manure and 94.0 ~ 166.2 mL-CH4/g-VS for dairy cattle manure. The amount of methane generated per wet weight of cattle manure, taking into account the change in volatile solid content and biochemical methane potential, differed by 42.8% for Hanwoo cattle manure and 129% for dairy cattle manure. No distinct seasonal patterns in the physicochemical characteristics of the manure were observed due to the influence of other factors (e.g., the storage period). Overall, these results indicate that it is important to design treatment facilities that consider variations in the physicochemical properties and methane generation of cattle manure.

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4해양 폐플라스틱 SRF의 고정층 연소 시 우드펠릿 혼소에 따른 화염전파 특성 분석

저자 : 박종근 ( Jongkeun Park ) , 유승한 ( Seunghan Yu ) , 김희윤 ( Heeyoon Kim ) , 류창국 ( Changkook Ryu ) , 김종현 ( Jonghyun Kim ) , 이재하 ( Jaeha Lee ) , 허준 ( Joon Heo )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 117-126 (10 pages)

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Marine waste plastic is a source of a variety of health and safety concerns in marine ecosystems. One disposal option for marine waste plastic is pelletization and subsequent combustion for energy recovery. However, with plastic pellets in a fixed bed, which is widely employed in waste combustion processes, it is difficult to achieve stable and continuous propagation of the ignition front from the surface to the bottom of the bed because of the melting of the plastic and subsequent blockage of air passages. This study investigated the fixed bed combustion of plastic pellets with the cofiring of wood pellets at different cofiring ratios and airflow rates. It was found that the steady propagation of the ignition front can be achieved via cofiring with at least 20 wt.% wood pellets. The burning rate was approximately 123 kg/m2h, and this figure can be used to determine the minimum area required for the design of the moving grate.

KCI등재

5EFB 연소공정에서 첨가제에 의한 클링커 형성 억제에 관한 연구

저자 : 박찬 ( Chan Park ) , 김혁진 ( Hyeok Jin Kim ) , 송민정 ( Min Jeong Song ) , 오세천 ( Sea Cheon Oh )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 127-138 (12 pages)

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The carbon emitted by the use of fossil fuels pollutes the environment, necessitating the development of alternative energy sources. However, renewable energy derived from nature such as solar energy and wind power is insufficient in practical applications. As a result, studies on the combustion efficiency of various forms of biomass, including empty fruit bunches (EFB) generated as a by-product of palm oil production, have been conducted. However, the generation of clinkers in the combustor during high-temperature combustion reduces the combustion efficiency and increases the treatment costs. Therefore, the effect of additives on clinker formation in the EFB combustion process was studied in this study. Kaolin and dolomite were tested as additives to inhibit clinker formation at additive-to-EFB-ash mass ratios of both 1 : 2 and 1 : 4, and the experimental reaction temperature was increased from 800℃ to 1000℃ at intervals of 50℃. The characteristics of the clinkers, including their sintering shape, were analyzed using X-ray diffraction and Xray fluorescence spectrometry for each experimental condition.

KCI등재

6국내 생활 및 의료 폐기물소각시설의 다이옥신 배출계수 산정방법에 관한 연구 - 중·대형시설 1 ton/hr 이상 중심으로 -

저자 : 권은혜 ( Eun-hye Kwon ) , 박세인 ( Sein Park ) , 강준구 ( Jungu Kang ) , 이승재 ( Seungjae Lee ) , 이원석 ( Wonseok Lee ) , 김기헌 ( Kiheon Kim )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 139-151 (13 pages)

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Dioxin is unintentionally generated during waste incineration and heat treatment processes. The Stockholm Convention conducts research, development, and monitoring to eradicate persistent organic pollutants (POPs), so some countries are currently calculating dioxin emissions. Emissions are also being calculated in Korea, and we would like to improve the dioxin calculation method currently in use. In this study, two different calculation methods were used and compared. Calculation method A is now in use, and data measured on the same day was used as the calculation factor. Calculation method B was developed, where the average of the annual data was used as the calculation factor. The emission factors were calculated using methods A and B for municipal waste incineration facilities with a 2 t/h or higher processing rate. The method A results were 81 ~ 204 ng I-TEQ/ton, and the method B results were 79 ~ 284 ng I-TEQ/t. Also, the emission factors were calculated using both methods for medical waste incineration facilities with a processing rate of 1 t/h or higher. The method A results were 834 ~ 2,737 ng I-TEQ/t, and the method B results were 737 ~ 2,049 ng I-TEQ/ton. The range of fluctuations was small. In the future, if the facility operation data of small incineration facilities are confirmed, it is judged that comparative analysis is also helpful.

KCI등재

7데이터센터 폐열의 지역난방 활용에 대한 경제적 효익 평가 및 온실가스 배출량 평가

저자 : 박미숙 ( Mi Sook Park ) , 황용우 ( Young Woo Hwang ) , 김다연 ( Da Yeon Kim ) , 양수진 ( Soo Jin Yang ) , 문진영 ( Jin Young Moon )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 152-159 (8 pages)

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As carbon neutrality emerges as a global challenge, the government announced the “Data Dam” as one of the ten major projects of the Korean New Deal. Accordingly, the number of data centers and the amount of power usage for equipment operation are expected to increase due to the acceleration of the data economy. In this study, the costs of existing heating systems and district heating systems using data center waste heat are compared according to the life cycle cost analysis using the payback period method. However, the payback period method has difficulty reflecting future value, so the value was complemented using the present value method. When the data center waste heat is used as district heating, assuming that the energy cost is frozen (scenario 1), the benefit is about KRW 4 billion for 1,000 households, and the investment cost recovery takes 18 years. On the other hand, if the energy cost goes up by 5% every five years from the start of the project (scenario 2), the resulting energy savings is about KRW 30 billion, and the time to recoup the initial investment is shortened by eight years. The study calculated greenhouse gas (GHG) emissions according to energy consumption for each scenario in accordance with the 2006 Intergovernmental Panel on Climate Change (IPCC) Guidelines. The results are 14.9 tCO2-eq for scenario 1 and 0.006 tCO2-eq for scenario 2 (a reduction of more than 99% in GHG emissions compared to scenario 1).

KCI등재

8사후관리 결과 분석을 통한 순환굵은골재 품질인증 3차 시험의 타당성 연구

저자 : 전수민 ( Soomin Jeon )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 160-165 (6 pages)

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Recycled coarse aggregates are tested twice for certification. If an aggregate passes both tests, the aggregate is certified; if it fails both, the aggregate is not certified. If the aggregate only passes one, then a third test is conducted to certify it for conformance or to terminate it if it does not conform. In other national certifications, such as fire-resistance structures, if one of two quality tests fails, the case is closed, so it can be considered that the quality test for aggregate certification that can be used for the third test is relatively easy. Follow-up audits for the certified products for the past three years were analyzed to see if there is a difference in the post-quality of aggregates certified by the secondary and tertiary tests. The results show no statistically significant difference between the two, and therefore, the tertiary test procedure of the certification process did not negatively affect the quality assurance of recycled aggregate.

KCI등재

9토픽모델링 분석을 활용한 국내 자원순환 연구동향 분석

저자 : 유재호 ( Jae-ho Yoo ) , 김하나 ( Hana Kim )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 166-173 (8 pages)

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Since the Wastes Control Act of 1987, Korea has laid the groundwork for proper waste management. The Framework Act on Resource Circulation was enacted in 2016 to manage and use waste throughout the entire lifecycle efficiently. Furthermore, “resource circulation” has recently become mainstream in domestic policies, such as establishing a digital-based resource circulation industrial complex as a part of the Korean New Deal 2.0. This study collected domestic studies on resource circulation, which has recently emerged as a major environmental issue, and analyzed research trends using topic modeling analysis. Relevant articles were collected from the Korea Citation Index using the keywords “resource circulation” and “circular economy,” and topic modeling analysis was performed on 207 papers and 712 keywords. Seven topics were drawn from the analysis: (1) energy-climate change policy, (2) eco-friendly design and systems, (3) waste electronics and plastic management, (4) revitalization of circular economy and local community, (5) environmental laws related to resource circulation, (6) concrete using recycled resources, and (7) matter flow analysis and management systems. In sum, it was found that many resource circulation studies have been conducted to address energy and climate change issues. In addition, resource circulation studies are not limited to policies and laws. Various studies are carried out across disciplines, such as engineering research on the management and utilization of specific resources and analytical research using tools, such as life cycle analysis (LCA). The findings of this study contributed to organizing major issues in recent resource circulation-related research and guiding future resource circulation-related studies.

KCI등재

10전기 및 가스 연소 열원을 이용한 커피찌꺼기 건조특성 평가

저자 : 이재희 ( Jae-hee Lee ) , 최장욱 ( Jang-wook Choi ) , 상병찬 ( Byung-chan Sang ) , 엄태인 ( Tae-in Ohm )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 39권 2호 발행 연도 : 2022 페이지 : pp. 174-183 (10 pages)

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The water content of the coffee grounds discharged from coffee beverage production facilities and coffee stores is about 75 wt.%. When the coffee grounds is used as solid energy source, drying technology is important because the high water content of the coffee grounds causes lower heating values reduction and combustion deterioration. In particular, it is necessary to maintain a constant water content of the dried coffee grounds with low energy consumption. In this study, two types of coffee ground batch dryer were tested: an electric heating and a gas burning system. After coffee grounds were injected into each dryer, vapor evaporation, drying rate, specific moisture evaporation rate, and drying efficiency were measured. The drying systems applied the moisture intensity (pulse, P) sensor and an automatic control program to maintain the moisture content of the dried coffee grounds. The drying performance and efficiency of the electric heating dryer were 21% and 33% higher than the gas burning dryer, respectively. The water content of dried coffee grounds is about 2.1 wt.%, and the ash content is 1.5 wt.%. The lower calorific value of dried coffee grounds is 5,710 kcal/kg, satisfying Bio-SRF (solid refuse fuel, Korea) quality standard. Therefore, when the dried coffee grounds is used as a solid energy source, it is advantageous to reduce the amount of greenhouse gas and save fossil fuels compared to the case of landfilling the dried coffee grounds.

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KCI등재

1Co-pyrolysis of Coffee Ground and Waste Polystyrene foam in a Tilted-slide Reactor

저자 : Yeon-woo Jeong , Sang-kyu Choi , Yeon-seok Choi , So-young Han , Quynh Van Nguyen

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 473-482 (10 pages)

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Co-pyrolysis of coffee ground and waste polystyrene foam was performed to produce pyrolysis oil in a tilted-slide reactor. The pretreated waste polystyrene foam was mixed in the ratios of 0%, 25%, 50%, 75%, and 100% with the dried coffee ground by weight. The yield and characteristics of the pyrolysis oil were compared at various mixing ratios. The pyrolysis oil yield increased almost linearly with the mixing ratio of the waste polystyrene foam, and it was 96.95wt% in the case of 100% waste polystyrene foam. The higher heating value of the pyrolysis oil also increased up to 41.44 MJ/kg. Mixing at least 25% of waste polystyrene foam to the coffee ground could significantly reduce the pyrolysis oil viscosity. It can be an efficient method to improve the quality of the pyrolysis oil by enhancing the heating value, and by reducing the viscosity.

KCI등재

2바이오차를 이용한 혐기성소화 중 황(S)의 영향 제어

저자 : 정재훈 ( Jae-hoon Jeung ) , 이시진 ( Si-jin Lee )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 483-492 (10 pages)

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In this paper, we studied the efficiency of reducing sulfur inhibition during anaerobic digestion using biochar. The study was conducted using a batch test called the biochemical methane potential test in which various concentrations of Na2S were injected to determine the effects of sulfur. This experiment used leached food wastewater as the feedstock, and the composition of the experiment was divided into three sets; In Set 1, only Na2S was injected except for control, based on sulfur concentration (20-1,000 mg/L). In Set 2, biochar (BC, 5 g/L) were additionally injected to the Set 1 conditions. For comparison, FeCl3 (24 g/ L) was injected together with Na2S in Set 3. The experiment indicated that overall the concentration of H2S in the generated biogas was significantly lower than that of other sets in Set 3 (injected with FeCl3). Furthermore, the concentration of H2S in Set 2 (injected with biochar) was found to be lower than that of Set 1 in the low-concentration range of Na2S. However, there was no significant difference from Set 1 in the high concentration range of Na2S. This result indicates that biochar can reduce the inhibition of sulfur; however, the efficiency decreases as the concentration increases. Furthermore, Set 3 yielded lower methane compared to the other sets, where the lowest biogas yield and methane yield were found to be 200+Fe in Set 3 as 0.046 m3/kgVS and 0.021 m3/kgVS, respectively. On the other hand, the highest biogas yield and methane yield were found to be 25+BC in Set 2 as 0.308 m3/kgVS and 0.166 m3/kgVS, respectively. This result indicates that Fe can reduce the effects of sulfur; however, it cannot enhance the efficiency of biogas production. Meanwhile, biochar has been seen to enhance both sulfur control and biogas production efficiency and hence can be used as a valuable material.

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3부순모래 생산공정 및 발생 폐기물의 관리 개선방안 연구

저자 : 최자형 ( Ja-hyung Choi ) , 이선주 ( Sun-ju Lee ) , 김용준 ( Yong-jun Kim ) , 강영렬 ( Young-yeul Kang ) , 전태완 ( Tae-wan Jeon ) , 엄남일 ( Nam-il Um )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 493-505 (13 pages)

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This study presents an improvement plan for the crushed sand manufacturing process (CSMP) through hazard assessment, utilization of CSMP waste, and process risk management. In Korea, the wet method has been applied to most CSMPs because of the technical aspects, production volume, and efficiency. To assess the harmfulness of wet CSMP waste, the analysis methods of leaching toxicity information on flocculants were investigated. Furthermore, to evaluate the risks of waste from CSMP due to its high moisture content, a fluidity test was conducted. The results indicated that there is no effect on the harmfulness of the target waste. However, it is difficult to guarantee unconditional safety because of the lack of detailed ecotoxicity information of the flocculant used for the washing process in the CSMPs. Finally, based on these results, the improvement plan of CSMPs was suggested. This plan includes the design operation guidelines to enable consistent process operation through standardized cleaning and dewatering process. In addition, the basic data with an effective management system of CSMP waste for increasing recycling was also suggested.

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4한국 환경기업의 R&D 투입이 경제적 성과에 미치는 영향 : 정부정책과 기술적 성과의 매개효과 분석

저자 : 홍준석 ( Jun Suk Hong ) , 박중구 ( Jung Gu Park )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 506-519 (14 pages)

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This article analyzes the direct relationship between R&D input and the economic outcome of Korean environmental companies, and examines the impact of government policy and technological output that play a mediating role in this process. To this end, a questionnaire survey was conducted on 201 Korean environmental companies, and the analysis was based on SPSS and AMOS. The results form the analyses indicated the following : ① the increase in companies' R&D input did not directely affect their economic outcome, ② the government policy did not efficiently medicate the relationship between the R&D input and the economic outcome of environmental companies. ③ technological output positively mediated the relationship between the R&D input and the economic outcome. ④ the government policy and technological output have sequential mediating effects in the process that the R&D input ultimately resulted in the economic outcome. According to these results, the policy implications are as follows : ① Korean environmental companies need to make sincere efforts to increase the effectiveness of R&D input. ② it is necessary to design and implement government policy that considers not only technical output but also economic outcome. ③ government policy needs to expand corporate R&D input and increase the efficiency between R&D input and technological output. ④ it is necessary to design government policy and management strategies that take into consideration the process from R&D input to the economic outcome. Some of the limitations of this thesis are as follows ① the analyses were based on the data from survey ② it has not analyzed by sectors, such as water, air, and waste. Finally, an in-depth and multilateral analysis of environmental companies is required according to the newly defined green industry classification in Korea.

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5피혁 폐기물의 섬유상 구조를 이용한 난슬립 아웃솔의 제조와 특성 연구

저자 : 이상철 ( Sang-chul Lee ) , 김관용 ( Gwan-yong Kim ) , 정득준 ( Deuk-jun Jung )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 520-528 (9 pages)

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This study deals with developing materials using waste leather and binders for sustainable material development by replacing butyl rubber, which is currently entirely dependent on imports. Since butyl rubber has few double bonds, the production efficiency is low because of the slow speed in the vulcanization process. Since the temperature of the process must be increased, an alternative material is required. Industries and research institutes are currently studying outsole pattern application and rubber mixing to replace butyl rubber, but technology development using recycled products is currently unavailable. This study developed an outsole material according to the type of rubber binder and the fibrous length of the leather waste. The bonding characteristics, crosslinking characteristics, abrasion resistance, and slip characteristics of the developed material were studied.

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6고온 호기성 소화를 통한 하수 슬러지 처리 시 고형물 및 용존성 유기물의 변화 양상

저자 : 심소영 ( So Young Sim ) , 왕지유 ( Zhi Rou Wang ) , 장현민 ( Hyun Min Jang )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 529-534 (6 pages)

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Over the past decade, thermophilic aerobic digestion (TAD) has been considered a practical approach to treating highstrength wastewater because of its several advantages. In this study, batch-mode TAD of sewage sludge was conducted using a lab-scale bioreactor to evaluate the changes in solid and soluble organic compounds. The TAD process achieved rapid degradation of the solid compound at 55oC. The removal efficiency of volatile suspended solids (VSS) increased rapidly at the early operation stage and achieved 25% at 48 h. Then, the VSS removal efficiency increased gradually up to approximately 40% at the end of the digestion (168 h). As a result of VSS degradation, the soluble chemical oxygen demand (SCOD) increased significantly up to 12 g/L at 36 h and then showed a slow decline pattern. Furthermore, the pattern of protease activity was similar to that of the SCOD. This result indicates that the rapid degradation of VSS is highly linked to the increase of protease activity and thermophilic conditions. This study used acetic acid and propionic acid. The variation patterns were similar under both acetic acid and propionic acid. The concentrations of acetic acid and propionic acid rapidly increased up to 3.05 g COD/L at 48 h and 2.51 g COD/L at 36 h, respectively. Then, major volatile fatty acids concentrations declined sharply and became undetectable after 144 h. Similar to the SCOD variation pattern, the soluble total nitrogen and NH4+-N also decreased sharply after 72 h. This might be because ammonia stripping is enhanced by pH rising and continuous aeration during the TAD.

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7고온 연소로를 이용한 고농도 육불화황(SF6) 분해 부산물의 Bead-Type 산화칼슘(CaO) 고정화 연구

저자 : 김종범 ( Jong Bum Kim ) , 류재용 ( Jae Yong Ryu )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 535-544 (10 pages)

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The cement industry is a typical energy-intensive industry that emits massive greenhouse gases during decarboxylation and calcination with high energy consumption per unit of value-added production. As a result, the pressure for mandatory reduction of cement production increases, which leads to a considerable economic loss. Since the marginal cost of greenhouse gas reduction is high, it is necessary to apply the development of economical greenhouse gas reduction measures and technologies. Sulfur hexafluoride (SF6) is a greenhouse gas with a very high global warming potential, it is mainly used for insulating materials and semiconductors for electric power and transmission facilities with heavy electric fields. This study aims to decompose SF6 gas which gets discarded after being used as an insulator for heavy electric devices in high temperatures by fixating it into free calcium oxide (CaO) in cement kilns and using it as a supplementary material like fluorspar and plaster. Based on results from previous research, in this study the discarded SF6 was fixated it into the bead type of CaO under a fixation temperature of 1000℃. The fixation rate calculated using the concentration difference between the front end and the hinder end of the decomposed by-products was 95% on average. The bead type of the fixated by-product was largely composed of calcium fluoride, anhydrite, and portlandite as the main composition minerals. Therefore, it is considered that if sulphur hexafluoride can be decomposed in high temperatures and fixated into free CaO in cement kilns, it can be used as supplementary minerals like fluorspar and plaster.

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8발생원별 관광폐기물 원단위 발생량 산정 연구 : 제주도 사례를 중심으로

저자 : 이소라 ( Sora Yl )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 545-554 (10 pages)

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This study examines the amount of waste generated by tourists at popular tourist destinations through the case of Jeju Special Self-governing Province (Jeju) in South Korea. First, the population of the local residents and that of inbound tourists and their length of stay were considered in the computation of municipal waste generation in Jeju to differentiate the amount of municipal waste generated by local residents and that by tourists. Next, to calculate the amount of waste generated by tourism-related activities and tourists on a daily basis (kg/person/day), this study chose major sources of tourism waste in the marine and air transport sectors (ferry and port, airline and airport, car rental and bus charters), wholesale and retail sectors (duty-free shops), lodging and restaurant industries (lodgings and in-house facilities and restaurants), and tourism industry (tourist attractions) and compiled the data on commercial waste generation from tourist sites through written surveys and field research. When the waste generated by tourists was considered in the municipal waste generated per capita in Jeju (1.77 kg/person/day), the amount generated by the residents of Jeju was found to be 1.42 kg/person/day, and approximately 19.5% of the total municipal waste originated from tourists. Moreover, daily tourism-related commercial waste generation per person was calculated to be 0.66 kg/person/day on average, with one tourist generating 1.01 kg/person/ day of tourism waste when assuming that an average tourist visits 1.3 tourist attractions per day. The study's findings reveal the need to enforce strict measures for businesses that generate large amounts of waste, as well as enforcing waste discharge reporting and limiting the type of businesses that are allowed to take their waste to designated waste collection points. The results of this study can be used as a base data for introducing green taxes that apply the “polluter pays” principle to individual emitters. Furthermore, the analysis results provided a basis for designing efficient policies and strategies for improving waste treatment systems and reducing waste generation at popular tourist destinations.

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9콘크리트용 순환굵은골재 품질인증에 대한 사후관리심사와 품질시험 결과 고찰

저자 : 전수민 ( Soomin Jeon )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 555-560 (6 pages)

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The recycled coarse aggregates for concretes that meet the quality standards set by the Ministry of Land, Infrastructure, and Transport are certified based on the audit and test results. After certification, follow-up management which includes audits and tests are conducted every year. In this paper, the correlation between the audit and the test results was examined. Specifically, it was examined whether the audit of coarse aggregates conducted in 2020 had a significant relationship with the suitability of each inspection item and the quality test results. Finally, it was found that there was a significant relationship between the overall audit results and the test results.

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10열수가압탄화(Hydrothermal Carbonization, HTC) 반응을 이용한 폐목재 고형연료 가능성에 관한 연구

저자 : 원민희 ( Minhee Won ) , 이재영 ( Jai-young Lee )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 6호 발행 연도 : 2021 페이지 : pp. 561-568 (8 pages)

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As an alternative to a new and renewable energy source, bio-coal is generated through hydrothermal carbonization (HTC) which is a novel renewable energy production technology using waste. Therefore, bio-coal was generated through HTC reaction using wood waste, which is the most used biomass raw material and requires a recycling method and confirmed its possibility as a solid fuel. It can be seen that the higher the reaction temperature and the longer the reaction time, the higher is the fixed carbon content, which affects the heating value. At 300℃ and 4 h, the lowest heating value was 6841.23 Kcal/kg. In addition, the fuel ratio at 300℃ was 1.3 ~ 1.6, which indicates a higher fuel ratio range than that of low-grade coal, and it can be seen from the van krevelen diagram that the biomass region is closer to the lignite region.

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