논문 상세보기

한국폐기물자원순환학회> 한국폐기물자원순환학회지> 바이오가스 적용 캐비티 매트릭스 연소기 개발

KCI등재

바이오가스 적용 캐비티 매트릭스 연소기 개발

Development of a Cavity Matrix Combustor for applying Biogas

안준 ( June An ) , 김하진 ( Ha Jin Kim ) , 전영남 ( Young Nam Chun )
  • : 한국폐기물자원순환학회
  • : 한국폐기물자원순환학회지 38권5호
  • : 연속간행물
  • : 2021년 10월
  • : 426-433(8pages)
한국폐기물자원순환학회지

DOI

10.9786/kswm.2021.38.5.426


목차

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

키워드 보기


초록 보기

The effects of conventional fossil fuels on the environment, such as air and carbon pollutions, have limited their use as an energy resource. To address this problem, biogas has emerged as an alternative energy source owing to its sustainable and renewable characteristics. In this study, we proposed a new type of cavity matrix combustor that can directly burn the products of small and medium-sized biogas facilities without the use of complicated facilities, such as CO2 separation or purification facilities. To identify the combustion characteristics of the cavity matrix combustor, parametric screening studies were conducted based on changes in air ratio, total gas supply, biogas composition, and exhaust recirculation, and the optimal operating conditions were suggested based on the results. The performance test of the cavity matrix combustor revealed that the combustor exhibited excellent biogas combustion characteristics. In addition, the optimal operating air ratio and total gas supply conditions at which the combustor exhibited a combustion efficiency of 79.2% for a biogas composed of 60% CH4 and 40% CO2 were 1.1 and 30 L/min, respectively. Furthermore, the content of CO and UHCs, which were unburned gases, in the combustor were 0.03 and 0.01%, respectively, and that of NOx was 1 ppm. In addition, the combustion efficiency of the combustor slightly increased to 86.59% when combustion gas recirculation was performed.

UCI(KEPA)

간행물정보

  • : 공학분야  > 환경공학
  • : KCI등재
  • :
  • : 격월
  • : 2093-2332
  • : 2287-5638
  • : 학술지
  • : 연속간행물
  • : 1984-2021
  • : 2923


저작권 안내

한국학술정보㈜의 모든 학술 자료는 각 학회 및 기관과 저작권 계약을 통해 제공하고 있습니다.

이에 본 자료를 상업적 이용, 무단 배포 등 불법적으로 이용할 시에는 저작권법 및 관계법령에 따른 책임을 질 수 있습니다.

38권6호(2021년 12월) 수록논문
최근 권호 논문
| | | |

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)

다운로드

(기관인증 필요)

초록보기

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

KCI등재

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)

다운로드

(기관인증 필요)

초록보기

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.

1
권호별 보기
같은 권호 다른 논문
| | | | 다운로드

KCI등재

1해양 (미세)플라스틱이 기후인자에 미치는 영향에 관한 고찰

저자 : 김용진 ( Yong-jin Kim ) , 이혜성 ( Hye-sung Lee )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 377-386 (10 pages)

다운로드

(기관인증 필요)

초록보기

Although the effects of marine microplastics on living organisms and their roles as carriers of organic pollutants to living organisms and the marine environment have already been studied, this paper focuses on the effects of marine microplastics on climate that haven't been studied yet. Microplastics in the oceans absorb more solar radiation and alter the biophysical properties of the surface microlayer, resulting in an increase in the sea surface temperature (SST). An increase in the SST and the concentration of microplastics that cover the surface layer, interrupts the physical interaction between seawater and carbon dioxide (CO2) in the atmosphere. Consequently, the solubility of carbon dioxide in seawater is lowered, and thereby increases the retention time of CO2 in the atmosphere. Furthermore, plastics that are in the ocean can be decomposed by solar radiation, such as UV-B rays and directly release greenhouse gases such as methane, ethylene, ethane, and propylene, and thereby accelerates the greenhouse effect. Therefore, considering the marine microplastics as a new factor in the ocean- atmosphere coupled model, the extent of the impact of microplastics on weather should be quantitatively reviewed.

KCI등재

2피혁 폐기물 업사이클링 기술에 기반한 친환경 건축용 텍스 소재 개발 연구

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

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 387-394 (8 pages)

다운로드

(기관인증 필요)

초록보기

This study investigated the use of leather shaving scraps, which is inevitably produced during leather processing, in an upcycling technology. Particularly, this study investigated the development of eco-friendly ceiling panels material as alternatives to currently used built-in gypsum ceiling panels for building construction. Existing gypsum ceiling panels exhibit very poor moisture absorption characteristics, which increase the cost of raw materials during the manufacturing process. In addition, exposure to radon, which is present in the raw materials used for the manufacturing of phosphoric acid gypsum, poses hazardous risks to the human body, such as lung cancer and stomach cancer. Moreover, the release these raw materials into the environment results in secondary pollution in high-moisture environment, as these materials facilitate the growth of fungi. Furthermore, gypsum ceiling panels exhibit a poor durability owing to their weak impact strength. In addition, the high production cost of gypsum has restricted its continuous mass production for building construction materials. To address these problems, this study employed a pulverization process to mix, cross-link, and vulcanize leather waste and rubber to fabricate ceiling panels materials for building construction using a dry method. The fabricated panel materials exhibited good strength, flame retardancy, waterproofness, and radon-free properties. The upcycling technology proposed in this study is an eco-friendly, halogen-free method that utilizes leather waste as the main raw material and aluminum hydroxide as a flame retardant. The cross-linking characteristics of the material with a change in the filler and cross-linking system were analyzed. In addition, the manufacturing characteristics and physical properties of the ceiling panels with a change in the flame retardants were investigated. The results revealed that the manufactured ceiling panels with the optimal formulation satisfied the UL-94 standard, and exhibited a hardness of 55 D and density of 1.339.

KCI등재

3수소 생산을 위한 알케인 수증기 개질 반응의 열역학적 분석

저자 : 이년호 ( Yeon-Ho Lee ) , 김지은 ( Jee-eun Kim ) , 공지현 ( Ji-hyeon Gong ) , 전경원 ( Kyung-won Jeon ) , 윤조희 ( Cho-hee Yoon ) , 장원준 ( Won-jun Jang )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 395-404 (10 pages)

다운로드

(기관인증 필요)

초록보기

This study investigated the optimal reaction condition for the production of hydrogen from the steam reforming of mixed alkane hydrocarbons using thermodynamic analysis. C1-C4 alkane hydrocarbons (CH4, C2H6, C3H8, and C4H10) were utilized as the reactants in the thermodynamic equilibrium analysis using Gibbs free energy minimization. The equilibrium composition, CH4 moles, CH4 conversion, selectivity (CO, CO2, C, and CH4), and H2 moles were estimated at various temperatures (200-1,000℃) and H2O/C ratios (0.5-3.0). The steam reforming of mixed alkane hydrocarbons is a complex reaction that proceeds simultaneously with the cracking of C2-C4, carbon formation, steam reforming, and water gas shift reactions. In addition, the results revealed that the reaction temperature and H2O/C ratio are important factors for these reactions. Furthermore, the reaction temperature and H2O/C ratio had no significant effect on the decomposition of C2-C4 alkanes (i.e., C2H6, C3H8, and C4H10), as they were totally converted into CH4 at temperatures below 650℃. In contrast, the H2O/C ratio had a significant effect on the carbon formation, as carbon formation did not proceed at H2O ratios of 2.0 and above. In addition, carbon was primarily produced in the temperature range from 350-550℃. Furthermore, the steam reforming reaction of CH4 dominantly occurred at a high temperature (>650℃) and H2O/C ratio (>1.5). In addition, high H2O/C ratios favored the water gas shift reaction, which could be attributed to the presence of excess H2O. The inhibition of cracking and coke formation and the maximization of the steam reforming and water gas shift reactions were considered for the stable operation of the process and production of hydrogen. The results revealed that the optimum temperature and H2O/C ratio for achieving a high CH4 conversion (>80%) and H2 moles (>25 mol) were ≥700℃ and >2.0, respectively.

KCI등재

4수열탄화를 통한 축분의 연료특성 및 소수성 개선 연구

저자 : 장은석 ( Eun-suk Jang ) , 김대기 ( Daegi Kim )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 405-411 (7 pages)

다운로드

(기관인증 필요)

초록보기

In this study, livestock manure was converted into fuel using hydrothermal carbonization, and the chemical composition of the resulting fuel was investigated. The results revealed that the hydrogen and oxygen content of the resulting fuel decreased, whereas the carbon content increased. In addition, there was a reduction in nitrogen content, which could be attributed to the gradual reduction in potential NOx emission, and the decomposition of organic nitrogen under thermal reaction conditions to liquid and gas. Furthermore, the hydrothermal carbonization removed some of the volatile matter in the manure and increased the proportion of fixed carbon content; thus, resulting in an increase in fuel ratio from 0.32 to 0.68 with an increase in the reaction temperature. These results indicated that the calorific value increased after hydrothermal carbonization. However, at hydrothermal carbonization temperatures above 250℃, the formed products exhibited a high ash content of 36.07- 41.54%, which had no effect on the increase in the calorific value. The storage and stability of the biomass fuel was investigated using a moisture reabsorption experiment. There was a sharp decrease in the moisture reabsorption value of the fuel, and only 75% of the raw reabsorption value was retained. This could be attributed to the removal of hydrophilic groups, such as OH (hydroxyl group) and C=O (carboxyl group), from the manure by the hydrothermal carbonization process.

KCI등재

5폐기물의 시멘트 소성로 대체 연료 활용 확대를 위한 분석 표준운영절차(안) 도출

저자 : 한건호 ( Gun Ho Han ) , 기동원 ( Dongwon Ki ) , 강신영 ( Shin Young Kang ) , 오대성 ( Dae Sung Oh ) , 김명기 ( Myoung Kee Kim ) , 박세원 ( Se Won Park )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 412-425 (14 pages)

다운로드

(기관인증 필요)

초록보기

Since the 1970s, waste tires have been used as auxiliary fuel in Korea, and the Korean cement industry has employed various wastes as auxiliary fuels and alternative materials. The main fuels used in cement kiln are bituminous coal and coke, and as of 2018, the rate of waste tires used as auxiliary fuel in Korea was only 23% (based on the heating value by the fossil fuel). This value was almost half of that of Europe (46%) and one-third of that of Germany (68%). Owing to the high temperature conditions of the gas and solid (materials) in cement kilns (2,000 and 1,450°C, respectively), most harmful pollutants, such as heavy metals, are volatilized; thus, eliminating the environmental impact of waste fuel. However, the use of waste fuel and materials in cement production process has garnered the negative perceptions of people. To address this problem, the Korean government and cement industry established the “Waste Use and Management Standard for Cement Kilns” in 2009; however, this had no significant effect on the negative perceptions of the people. The effective disposal of waste in Korea has remained a challenge owing to lack of additional landfill areas and incinerators; particularly, China's ban on waste imports in April 2018 has compounded this problem. To actively utilize combustible waste as alternative fuels for cement production process, this study proposed thermal/environmental and quality/environmental analysis candidates and standards, and suggested a standard operating procedure for cement kilns. The standard operating procedure of waste proposed in this study included heating value, elementary, and heavy metals content analyses, and that of cement included physical and chemical composition, heavy metals content and leaching, and radioactivity analyses. We believe that the proposed standard operating procedure can be employed in the future to ensure the reliability and enhancement of the utilization of waste as alternative fuels for cement production. Additionally, the standard proposed in this study may solve problems related to domestic waste disposal.

KCI등재

6바이오가스 적용 캐비티 매트릭스 연소기 개발

저자 : 안준 ( June An ) , 김하진 ( Ha Jin Kim ) , 전영남 ( Young Nam Chun )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 426-433 (8 pages)

다운로드

(기관인증 필요)

초록보기

The effects of conventional fossil fuels on the environment, such as air and carbon pollutions, have limited their use as an energy resource. To address this problem, biogas has emerged as an alternative energy source owing to its sustainable and renewable characteristics. In this study, we proposed a new type of cavity matrix combustor that can directly burn the products of small and medium-sized biogas facilities without the use of complicated facilities, such as CO2 separation or purification facilities. To identify the combustion characteristics of the cavity matrix combustor, parametric screening studies were conducted based on changes in air ratio, total gas supply, biogas composition, and exhaust recirculation, and the optimal operating conditions were suggested based on the results. The performance test of the cavity matrix combustor revealed that the combustor exhibited excellent biogas combustion characteristics. In addition, the optimal operating air ratio and total gas supply conditions at which the combustor exhibited a combustion efficiency of 79.2% for a biogas composed of 60% CH4 and 40% CO2 were 1.1 and 30 L/min, respectively. Furthermore, the content of CO and UHCs, which were unburned gases, in the combustor were 0.03 and 0.01%, respectively, and that of NOx was 1 ppm. In addition, the combustion efficiency of the combustor slightly increased to 86.59% when combustion gas recirculation was performed.

KCI등재

7금-은 폐광산 광미의 수은 열적감량 특성

저자 : 조수진 ( Soo-jin Cho ) , 서용칠 ( Yong-chil Seo ) , 이은송 ( Eun-song Lee ) , 고주인 ( Ju-In Ko )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 434-441 (8 pages)

다운로드

(기관인증 필요)

초록보기

This study conducted thermal desorption experiments for the remediation of mercury-contaminated soils with a mercury concentration of 26.39 mg-Hg/kg from gold-silver mine tailings. The thermal desorption experiments were performed in a muffle furnace at a pressure of 1 atm in the temperature range from 300 to 700℃. In addition, indirect thermal treatment experiments were conducted by adding 20 g of homogeneous samples into the crucible for 1 to 30 min. The mercury concentrations of the residual samples were analyzed using EPA method 7471a. Based on the results of the analysis of mercury concentration in the thermal treatment, the thermal desorption characteristics of mercury contaminated tailings were analyzed using reaction rate theory. The reaction rate constants (k) were calculated from 1.3 × 10-3 to 1.9 × 10-2 sec-1 with a change in the temperature conditions. The results revealed that k increased with increasing temperature. In addition, the calculated pre-exponential factor and activation energy were 0.118 sec-1 and 2.76 kcal/gmol, respectively. Furthermore, the thermal treatment conditions required to achieve the 4 mg-Hg/kg criteria for Hg content were approximately 1,451 s at 300℃ and 992 s at 400℃.

KCI등재

8계층화 분석을 이용한 공공건축물의 순환골재 활용 활성화 요인 분석

저자 : 이두길 ( Doo Gil Lee ) , 박성용 ( Seong Yong Park ) , 이상조 ( Sang Jo Lee ) , 정재우 ( Jae Woo Chung )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 442-451 (10 pages)

다운로드

(기관인증 필요)

초록보기

This study employed the analytic hierarchy process (AHP) to investigate the main decision-making factors involved in the selection of materials forrecycled aggregates for constructing public buildings. The factors, which consisted of five main items and 15 detailed items in the AHP model, were devised through consultations with construction experts. Based on the weights of the main and detailed items, the “Subject to mandatory use” element exhibited the highest level of importance, followed by the “supplier” and “price” elements in the procurement sector, and the “specification content” in the construction sector. Furthermore, the results revealed that it is essential to reflect the use of recycled aggregates at the initial design stage and to introduce a mandatory use of recycled aggregates. In addition, the criteria for suppliers to meet upgrading the production technology of recycled aggregates are required.

KCI등재

9탈취제 성상에 따른 슬러지 내 황화수소 저감에 관한 연구

저자 : 정회석 ( Hoesuk Jung ) , 이수정 ( Sujeong Lee ) , 선제호 ( Jeaho Seon ) , 요스케카츠라 ( Yousuke Katsura ) , 한인섭 ( Ihnsup Han )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 452-457 (6 pages)

다운로드

(기관인증 필요)

키워드 보기
초록보기

This study compared H2S removal efficiency of two types of deodorants (NOx deodorant ACE and Fe3+ deodorant S) at high temperature versus low temperature (summer/winter). For both temperature conditions, NOx deodorant ACE removed H2S by 99% or more within 2 hours at the least dose of 2.5% (w/w), and this lasted for about 8 hours maximum. Fe3+ deodorant S removed H2S by 99% or more at the dose of 5.0% (w/w), and this lasted for about 6 hours maximum. For the sludge where H2S exists at high concentration, NOx deodorant ACE was the most appropriate. For Fe3+ deodorant S, additional alkaline chemicals are expected to be necessary.

KCI등재

10Study of Bio-Waste Anaerobic Digestion and its Membrane Purification Technologies in Oversea: I. Malaysian Biogas Scale-up Case

저자 : 박영규 ( Young Gyu Park ) , 선영근 ( Young Geun Sun )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 5호 발행 연도 : 2021 페이지 : pp. 458-472 (15 pages)

다운로드

(기관인증 필요)

초록보기

The palm oil mill industry in Malaysian generates 100 million ton of palm oil mill effluent (POME) and EFB (empty fruit bunch) as byproducts annually. This study identified the location, capacity and technology of biogas refinery plants for the production of biogas from the byproducts of the Malaysian palm oil mill plant. This study investigated the production of biogas via the anaerobic co-digestion of EFB under mesophilic anaerobic condition. The results revealed that subjecting EFB to an alkaline pretreatment method enabled a high-concentration methane yield. The raw biogas obtained from the anaerobic co-digestion of POME and EFB at 1.013 bar contained 61% CH4, 33.5% CO2 and 180 ppm H2S and was produced at rate of 51 - 68㎥/h. The utilization of biomethane as a bio-CNG gas has been unexplored: hence, this study investigated the purification of POME biogas into bio-CNG gas. The pretreatment of raw biogas using chelate-iron (EDTA-iron solution) process, which is the most promising technique for the removal of 99% H2S, was employed in this study. A pilot-scale separation plant with a capacity of 20㎥/hr that utilize cellulosic spiral wound membrane (MTR, USA) for upgrading biogas to CNG fuel quality was constructed and operated at the biogas plant. The result contained 99.1% CH4, 1.8% CO2, 0.004% H2O and 0.9 ppm H2S. These results indicate that the energy contents of biogas can be significantly enhanced by upgrading it to CNG fuel.

1
발행기관 최신논문
자료제공: 네이버학술정보
발행기관 최신논문
자료제공: 네이버학술정보

내가 찾은 최근 검색어

최근 열람 자료

맞춤 논문

보관함

내 보관함
공유한 보관함

1:1문의

닫기