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한국폐기물자원순환학회> 한국폐기물자원순환학회지> 재활용 PET 투수블록과 시멘트 투수블록의 환경영향 비교평가에 관한 연구

KCI등재

재활용 PET 투수블록과 시멘트 투수블록의 환경영향 비교평가에 관한 연구

A Study on the Environmental Impact Comparison of Recycled PET Permeable Block and Cement Permeable Block

임성현 ( Sung-hyun Lim ) , 윤석표 ( Seok-pyo Yoon )
  • : 한국폐기물자원순환학회
  • : 한국폐기물자원순환학회지 38권4호
  • : 연속간행물
  • : 2021년 08월
  • : 357-365(9pages)
한국폐기물자원순환학회지

DOI

10.9786/kswm.2021.38.4.357


목차

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

키워드 보기


초록 보기

In this study, we developed an environmental assessment method to investigate permeable blocks prepared using recycled polyethylene terephthalate (PET) as a binder. First, Los Angeles abrasion test was conducted to simulate the surface abrasion caused by the long-term use of water-permeable block, and the number of rotations was 100-300. To separate the microplastics from the residual fragments of the degraded surface of the permeable block, the microplastics were subjected to a flotation process using calcium chloride as a sorting solvent. The obtained microplastics from the abrasion test was quantitatively and qualitatively analyzed using a particle size analyzer, microscopy, and Fourier transform-infrared spectroscopy. To obtain the extract, the permeable block was subjected to a leaching test, and the pH and Ca concentration were measured. The pH of the cement-based permeable block (10.79 ± 0.17) was higher than that of the PET-based permeable block (9.58 ± 0.23). In addition, the extracts of recycled PET- and cement-based permeable blocks were subjected to an acute toxicity test using Daphnia, and the results revealed that the toxic unit of the recycled PET permeable blocks was 0, whereas that of the cement-based permeable blocks was 1.98 ± 0.11.

UCI(KEPA)

간행물정보

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


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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.

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)

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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.

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)

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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.

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)

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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.

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)

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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.

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)

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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.

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)

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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.

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)

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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.

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)

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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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KCI등재

1COVID-19 감염병 확산에 따른 일회용 마스크의 적정 관리 방안 연구

저자 : 이송현 ( Songhyun Lee ) , 김병환 ( Byeonghwan Kim ) , 지승민 ( Seungmin Ji ) , 장용철 ( Yong-chul Jang ) , 이어진 ( Eojin Lee ) , 박미솔 ( Misol Park ) , 김선용 ( Sunyong Kim ) , 심유나 ( Yuna Sim ) , 김동현 ( Donghyeon Kim ) , 한소영 ( Soyeong Han )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 281-293 (13 pages)

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This study examined the current management and problems of discarded single-use masks in Korea during COVID- 19. Field visits have been made to identify potential problems associated with the disposal of single-use face masks. We analyzed a total of 32 discarded single-use face masks and newly made singe-use face masks for material composition and characteristics. Based on this study, there were more than 6.7 billion single-use masks manufactured in 2020, indicating that more than six times higher than the production of the masks in 2019 due to COVID-19 pandemic. The average use of single-use face masks per person was found to be 130 masks/yr, which is equivalent to 6.7 billion masks/yr in 2020 in Korea. After the collection of the used masks, the large fraction of discarded masks was incinerated (14,961 ton or 3.8 billion masks) and landfilled (8,056 ton or 2.1 billion masks). Only approximately 1% of the discarded masks from households was improperly disposed on streets, parks, roads, shopping carts, rivers and streams, and other environment. Improper disposal of such masks may pose a threat to humans, animals, and other ecological receptors because of potential spread of virus, the occurrence of microplastics and their non-biodegradable characteristics. Technical development of biodegradable face masks has been made from scientific community to reduce plastic pollution from single-use face masks. However, more research is still needed to warrant the safety, biodegradability, waste management, and economic factors of the eco-friendly face masks. Waste minimization and prevention of single-use face masks is a challenging task due to the preference of the mask to consumers over the COVID-19 pandemic.

KCI등재

2순환경제를 위한 PET병 물질흐름분석과 재활용에 따른 온실가스 감축량 산정 연구

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

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 294-302 (9 pages)

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Plastic wastes are majorly packaging plastic materials composed of polyethylene terephthalate (PET). The improper disposal of PET bottles can cause severe environmental problems, such as environmental plastic pollution, greenhouse gas emission, resource depletion, and marine plastic pollution. Owing to the steady increase in the consumption of PET bottles, it is important to improve the recycling rates and quality of recycled PET products. This study analyzed the material flow of PET bottles in Korea in 2018 to develop an appropriate management policy for recycling PET bottles. In addition, the content of greenhouse gases reduced via the recycling of PET bottles was quantified using US EPA waste reduction model (WARM). The results revealed that approximately 301,000 tons of PET bottles were sold and discharged as plastic waste in 2018. In addition, approximately 236,000 tons of waste PET bottles were recycled. Consequently, about 240,000 tons of CO2eq was reduced in 2018 and 1,768 thousand tons of CO2eq was reduced from 2010 to 2018. This study aimed to highlight the potential benefits of recycling PET bottles by providing the content of reduced greenhouse gas and recycled materials. The quantitative analysis of the material flow revealed that it is essential to perform high-quality recycling of PET bottles (e.g., bottle-to-bottle and long-fiber uses) in contrast to low-grade recycling to achieve a circular economy.

KCI등재

3호기성 폐기물매립지의 온실가스 감축효율 및 메탄보정계수(MCF) 평가

저자 : 송상훈 ( Sang-hoon Song ) , 고준혁 ( Jun-hyeok Ko ) , 박상흠 ( Sang-heum Park ) , 김란희 ( Ran-hui Kim ) , 김상민 ( Sang-min Kim ) , 이남훈 ( Nam-hoon Lee ) , 박진규 ( Jin-kyu Park )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 303-309 (7 pages)

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This study aims to analyze greenhouse gas (GHG) emissions reductions in anerobic municipal solid waste (MSW) landfills to evaluate the efficiency of active aeration in the reduction of GHG and to verify the accuracy of the methane correction factor (MCF) reported in the 2019 Refinement (i.e., 0.4). Experimental results revealed that the GHG reduction efficiency was 61.1%, which is slightly lower than that reported in literature. However, under the assumption that active aeration was applied to all MSW landfills in Korea in 2018, this finding indicates that active aeration reduced GHG emissions by 4.7 million tons of CO2eq., which is approximately equivalent to 60% of the emissions from the MSW landfills. This corresponds to the 2030 GHG reduction target of Korea's waste sector. This indicates that the application of active aeration to MSW landfills is essential for reducing GHG emissions from the waste sector. The calculated MCF of the landfill with a methane concentration of 5% or less under aerobic conditions was 0.31 to 0.34, which is lower than the MCF default value suggested in the IPCC guideline (i.e., 0.4). However, further research on MCF in aerobic landfill should be conducted.

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4Methane Production of Food Waste Anaerobic Digestion Recovered from NaCl Inhibition by Water Dilution

저자 : Eunil Cho , Qiyong Xu , Danling Xia , Jae Hac Ko

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 310-317 (8 pages)

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One of the significant challenges of food waste anaerobic digestion (AD) is the negative effect of high NaCl concentrations. This study investigated the effects of NaCl fluctuation on the methane generation of food waste AD under thermophilic and mesophilic conditions. Particularly, the effects of the shock loading of high NaCl concentration with/ without water dilution treatment were investigated. Generally, the methane generation decreased with increasing NaCl concentration. In addition, the sensitivity of the thermophilic AD to NaCl concentrations (5-10 g/L) was higher than that of the mesophilic AD. Furthermore, with an increase in the NaCl concentration from 0 to 30 g/L, the accumulative methane volumes of the thermophilic reactors decreased from 210 to 45 mL/gVS, and those of the mesophilic reactors decreased from 265 to 67 mL/gVS. Additionally, the pH of digestate decreased with increasing NaCl concentration. In contrast, the concentrations of the chemical oxygen demand and volatile fatty acid increased with increasing NaCl concentration. These results indicated that a shock loading of NaCl significantly reduced methane generation. In addition, the methane generation rates could be recovered up to 64-72% using water dilution as a remedial measure. Further investigation using 16S rRNA analysis revealed that the predominant genus of the methanogens shifted from Methanoculleus to Methanosarcina after the removal of the osmotic stress using water dilution.

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5Lab-Scale 반응기를 이용한 PCNs 함유 폐기물의 소각처리 가능성 연구

저자 : 권은혜 ( Eunhye Kwon ) , 배지수 ( Jisu Bea ) , 김우일 ( Wooil Kim ) , 윤영삼 ( Youngsam Yoon ) , 이원석 ( Wonseok Lee ) , 박호연 ( Hoyeun Park )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 318-329 (12 pages)

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Polychlorinated naphthalenes (PCNs), one of Persistent Organic Pollutants (POPs), and are colorless crystalline substances with similar structure and physical and chemical properties with PCB (polychlorinated biphenyl), and are produced by the chlorination of naphthalene. PCN is one of POPs are rarely degraded in the environment; consequently, they negatively impact the environment by threatening human health and the ecosystem. In this study, the potential of a stable treatment for lab-scale-incinerated waste containing PCNs was evaluated. For this study, waste containing PCNs were selected as the surface coating agent, mixed sample, and technical sample. The results revealed that when the PCNs concentration was 34.552 ~ 2,582.463 ng/g, the concentrations of Mono-CN and Tetra-CN were higher than those of other homologues. The incineration treatment conditions were derived by measuring three parts, after which the elemental composition was analyzed and the calorific value, theoretical air content, and residence time were calculated. Using the temperature of the target sample, thermogravimetric analysis revealed that the incineration treatment can be achieved at the incineration temperature of the existing incineration facility via weight change. Therefore, the incineration temperature was set between 850 and 1,100℃; however, the incineration temperature of the sample containing a high concentration of PCNs was set at 350, 500, 850, and 1,100℃. At 350 and 500℃, high concentrations of CO and NOx were observed, which could be attributed to incomplete combustion. Furthermore, heat-sensitive PCNs showed a de-chlorination reaction between 200 to 440℃. In addition, the decomposition rate (DRE) slightly increased according to the incineration temperature increase.

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6Alum 슬러지를 이용한 인제거용 흡착제 개발

저자 : 한상무 ( Sang Moo Han ) , 김도형 ( Do Hyung Kim ) , 김소희 ( So Hee Kim ) , 김홍민 ( Hong Min Kim ) , 정병곤 ( Byung Gon Jeong )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 330-336 (7 pages)

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Various media were manufactured using different ratios of alum sludge obtained from a water purification plant, loess, and clay, and the properties of the media were investigated. The results revealed that the optimal compressive strength was achieved at a ratio of 15/65/20 (alum sludge/loess/clay). In addition, the absorption rate of the media increased with an increase in the quantity of alum sludge in the media. Furthermore, the scanning electron microscopy analysis of the pore structure of the media revealed that the optimal permeability was achieved at a ratio of 15/65/20. Additionally, the manufactured media satisfied the dissolution test of heavy metals regardless of the mixing ratio. Furthermore, at the optimal mixing ratio, the removal efficiency of phosphorus by the media increased with a decrease in the size of the media.

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7우리나라 타이어 마모 분진 배출량 및 수계 유입량 추정

저자 : 이혜성 ( Hyesung Lee ) , 김용진 ( Yongjin Kim )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 337-349 (13 pages)

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Tire particles account for a high proportion of emitted microplastics, and the quantity is increasing with an increase in the production of vehicles and tires. Such tire particles are present not only in roadsides, rainwater inlets, and sewage treatment facilities, but also in mud flats. Tire particles are introduced into water environment through the atmosphere and rainwater. In this study, the inflow of tire particles to water environment in Korea based on district was estimated using statistical data on roads and sewage management areas and previous studies. In addition, the quantity of tire particles generated by each type of vehicle and the ratio of the inflow of the generated tire particles to water environment based on the district and type of road and vehicle were reviewed. The results revealed that the quantity of tire particles generated in Korea was 49,995 t per year, and the quantity of tire particles generated based on the vehicle type was in the order of heavyweight truck > bus > passenger car > lightweight truck. In addition, the quantity of tire particles discharged to the atmosphere was 50-4,999 tonnes per year, and the quantity of tire particles retained on the ground surface was 44,995- 49,945 tonnes per year. Furthermore, the quantity of tire particles introduced to water environment was 12,897-24,241 tonnes per year, and the inflow to water based on the road type was in the order of other roads > national road > highway.

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8도시 하수슬러지의 열 가수분해와 농업용 바이오솔리드로의 이용

저자 : 안조환 ( Johwan Ahn ) , 하승수 ( Seung-soo Ha )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 350-356 (7 pages)

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Biosolids are physically or chemically stabilized organic solids derived from sewage treatment processes. In the last one year, municipal sewage sludge, which is treated using thermal hydrolysis, has been used as a raw material for export fertilizer. Thus, in this study, we investigated if the quality of biosolids recovered from sewage treatment plants equipped with both thermal hydrolysis and anaerobic digestion processes meets the Korean fertilizer raw material standards. The investigations revealed that the contents of heavy metals, Ni, Zn, and Al in biosolids were higher than the regulated standards; however, pathogens, such as Escherichia coli and Salmonella sp., were not observed in the biosolids. The results indicated that biosolids are inappropriate as a raw material for domestic fertilizer. Nevertheless, as biosolids can be used for manufacturing export fertilizer, it is necessary to establish the quality standards for toxic heavy metals, pathogens, and organic micropollutants present in biosolids for the protection of public health.

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9재활용 PET 투수블록과 시멘트 투수블록의 환경영향 비교평가에 관한 연구

저자 : 임성현 ( Sung-hyun Lim ) , 윤석표 ( Seok-pyo Yoon )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 357-365 (9 pages)

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In this study, we developed an environmental assessment method to investigate permeable blocks prepared using recycled polyethylene terephthalate (PET) as a binder. First, Los Angeles abrasion test was conducted to simulate the surface abrasion caused by the long-term use of water-permeable block, and the number of rotations was 100-300. To separate the microplastics from the residual fragments of the degraded surface of the permeable block, the microplastics were subjected to a flotation process using calcium chloride as a sorting solvent. The obtained microplastics from the abrasion test was quantitatively and qualitatively analyzed using a particle size analyzer, microscopy, and Fourier transform-infrared spectroscopy. To obtain the extract, the permeable block was subjected to a leaching test, and the pH and Ca concentration were measured. The pH of the cement-based permeable block (10.79 ± 0.17) was higher than that of the PET-based permeable block (9.58 ± 0.23). In addition, the extracts of recycled PET- and cement-based permeable blocks were subjected to an acute toxicity test using Daphnia, and the results revealed that the toxic unit of the recycled PET permeable blocks was 0, whereas that of the cement-based permeable blocks was 1.98 ± 0.11.

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10연소공기비율에 따른 가축분뇨연료 소각로 내 연소특성에 대한 수치해석 연구

저자 : 윤종혁 ( Jonghyuk Yoon ) , 송형운 ( Hyoungwoon Song ) , 장은석 ( Eun-suk Jang )

발행기관 : 한국폐기물자원순환학회 간행물 : 한국폐기물자원순환학회지 38권 4호 발행 연도 : 2021 페이지 : pp. 366-376 (11 pages)

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With the depletion of fossil fuels, the use of new and renewable energy has attracted significant attention. Among various biomass fuels, wood pellets and chips are used as commercial fuels owing to their low water content compared to sewage sludge and food waste. Recently, the use of livestock manure as fuel has attracted significant owing to its ease of collection and transportation. However, the low economic feasibility of co-firing boiler, which is used to process livestock manure solid refuse fuel (SRF), has limited the further application of livestock manure. Therefore, the development of an efficient grate boiler for livestock-manure is highly needed. In this study, a three-dimensional computational fluid dynamics simulation was performed to evaluate the combustion performance of a livestock manure SRF grate furnace. To validate the numerical method, the numerical results of the temperature and species concentration at several monitoring points were compared to those of the experimental results. In addition, a parametric study was performed using various ratios of primary to assist air to understand the effects of air conditions on the overall combustion performance.

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