간행물
한국폐기물자원순환학회지 KCI 등재 Journal of Korea Society of Waste Management
- 발행기관 한국폐기물자원순환학회
- 자료유형 학술지
- 간기 연8회
- ISSN 2093-2332 (Print)2287-5638 (Online)
- 수록기간 1984 ~ 2018
- 주제분류 공학 > 환경공학 공학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제33권 제4호 (2016년 6월) 12건
短報
1.
2016.06
서비스 종료(열람 제한)
This study investigated the enzymatic pretreatment of food waste (FW) using Viscozyme L to enhance reducing sugar (RS) production. Response surface analysis was used to study the effects of the pretreatment variables of temperature (T) (35-55oC) and incubation time (IT) (9-15 hr). The results indicated that the generated regression model represented the relationship between the independent variables and the responses. The RS production from FW was affected by IT rather than T. Within the design boundaries, a maximum RS yield (0.72 g/g of total solids of FW) was obtained at 44.5oC and 13.7 hr.
總設
2.
2016.06
서비스 종료(열람 제한)
More than 8 M tons of coal ash is generated from coal-fired thermal power plants every year, and the generation rate of coal ash has been increasing steadily recently. However, the recycling rate of coal ash is about 70%. It is time to introduce the beneficial use of coal ash. Much coal ash is used in mining applications and reclamation sites in the EU and the U.S. However, coal ash cannot be used at mine reclamation sites in Korea because of its legal limitations due to environmental concerns. Therefore, in this research, the eco-friendly use of coal ash at mine reclamation sites in Korea is presented. To develop the eco-friendly use of coal ash at mine reclamation sites in Korea, this study examined the beneficial use of coal ash at mines and the environmental issue of the specific use of coal ash at mine reclamations sites and carried out case studies on the use and management systems of coal ash in overseas countries and investigation of the present use of coal ash at mine reclamation sites in Korea.
原著
3.
2016.06
서비스 종료(열람 제한)
In this study, content and leaching tests of heavy metals (14 items) were analyzed to evaluate the recyclability of the sludge from wastewater treatment facilities. Additionally, this was compared with and examined with the standard of controlled waste, certification standards of compost materials, etc. In the results of the content test, Cr6+ (30.82 mg/kg) of waste from the leather, fur, and textile industries (EWC 04) and Cr6+ (103.13 mg/kg) of waste from the manufacture formulation, supply, and use of coatings (EWC 08) were higher than the proposed criteria of Cr6+ (20 mg/kg). The high level of Cr6+ concentration was observed because of the use of sodium dichromate and chromic anhydride in the materials of dyestuffs and pigments and ink in the EWC 04 and EWC 08 processes. The results on sludge in this study did not meet the standard of the Fertilizer Control Act and quality standard of fuels. In particular, the high levels of Pb and Cd was the main reason.
4.
2016.06
서비스 종료(열람 제한)
Bio-SRF (Bio-Solid Refuse Fuel) based on livestock waste has a low heating value and high moisture content. The concentration of toxic gas, such as SOx, NOx, and HCl, in the flue gas is changed according to the composition of fuel, which has been reported. Therefore, the study of fuel combustion characteristics is necessary. Additionally, the study of fuel firing characteristics is necessary. In this study, we investigated the combustion characteristics of the mixed firing of coal and Bio-SRF made from livestock waste in a circulating fluidized bed combustor (CFBC). The Bio-SRF of livestock waste was mixed with different ratios of coal based on the heating values when the coal was completely combusted in CFBC. In the results of the experiment, the combustor efficiencies of the calculated unburned carbon concentration in the fly ash were 98.87%, 99.04%, 99.64%, and 99.71% when the multi-firing ratio of livestock sludge increased from 100/0 to 70/30. In addition, the boiler efficiencies were 86.23%, 86.30, 87.24, and 87.27%. Through the experimental results, we identified that the mixed combustion of livestock sludge is not affected by boiler efficiency. We have systematically investigated and discussed the temperature changes of an internal combustor, compositions of flue gases, solid ash characteristics, and the combustion and boiler efficiency during the mixed firing of coal and Bio-SRF.
5.
2016.06
서비스 종료(열람 제한)
As shown in the analysis of energy recovery management policies and energy recovery rate calculation methods in Europe and Japan, it is necessary to achieve sustainable technical development and review and supplement relevant systems in Korea to maximize the thermal energy recovery rate of waste incineration facilities. By taking into account the energy (heat or power) sold in high-demand places and the energy that is independently generated and used for other processes (sludge-drying facilities, convenient facilities for local residents, etc.), it is necessary to devise criteria for a reasonable energy recovery rate. Additionally, in calculating a lower heating value of the total waste injected in an incinerator, it is necessary to review an objective and scientific lower heating-value calculation formula and calculation method that exclude policy factors following the example of the EU.
6.
2016.06
서비스 종료(열람 제한)
This study presents flowable fill material using collected CO2 byproduct, which prevents geotechnical sinking related to underground utilities in the vicinity of downtown areas. The physical and mechanical characteristics of calcium carbonate found using laboratory tests (the uniaxial compressive strength test, comparison of the shear base of dynamic behavior and restriction pressure, the freeze-thawing test) on 3, 7, 14, 28, and 56 days of the flowable fill were investigated and analyzed. The correlations of the unconfined strength, elastic modulus, flow, and w/c were suggested as evaluation indicators of the mechanical characteristics for the calcium carbonate flowable fill.
7.
2016.06
서비스 종료(열람 제한)
The chemical kinetics of the steam reforming of the pyrolysis oil of polypropylene (PP) over a ruthenium-based catalyst has been examined as a function of pyrolysis oil and steam partial pressures at various temperatures. The activation energy of steam reforming over Ru/Al2O3 catalyst is 136 kJ/mol, and the reaction orders of pyrolysis oil and steam are 0.42 and 0.24, respectively. Fitting the experimental data to the Langmuir?Hinshelwood expression shows that the steamreforming reaction probably proceeds via the dissociative adsorption of pyrolysis oil and steam on two different sites.
8.
2016.06
서비스 종료(열람 제한)
This study aimed to describe the mechanism and reaction characteristics of the adhered mortar removal of recycled aggregate (RA) using microwave irradiation (700 W) and a mixed solution of HCl and H2O2. The HOCl concentration increased to 29.7 M at 35oC and 40 min of reaction time without RA in the mixed solution, which shows that HCl reacts with H2O2 to form HOCl and water. However, after nitrogen purging, the HOCl concentration decreased to 2.71 M in 20 min, which proves indirectly that HOCl reacts with HCl to form Cl2 and water. The HOCl concentration decreased from 29.7 M to 1.88 M at 35oC in 40 min with RA in the mixed solution, and the Ca2+ concentration increased to 9,750 mg/L, which demonstrates indirectly that mortar mainly composed of Ca(OH)2 reacts with Cl2 to form Ca(OCl)2 and CaCl2. The reaction rate (k) with microwave heating was about 2.3 times faster than that with conventional heating, and k at a reaction temperature of 50oC was about 1.3 times faster than that at 35oC. The treated RA was improved in density, water absorption, abrasion loss, and absolute volume.
9.
2016.06
서비스 종료(열람 제한)
Solid-liquid separation is important for securing safe runoff quality in the biological treatment process. In particular, the method for determining sludge settlement characteristics using SVI, which is a parameter, evaluates the precipitation features of sludge in an aeration tank and secondary precipitation tank and is a simple and widely used method. However, in methods using SVI, the accumulation of objective data is usually not possible, since the subjective judgment of operators is mainly involved in this evaluation method. Therefore, the automation of SVI measurement is required to improve the determination method of sludge settlement using SVI. In this study, an automatic measurement system of SVI using optics was developed. To evaluate the reliability of the measurement system, a visual inspection test was performed in parallel with our suggested SV30 auto-measurement system using actual sludge and a similar tendency in the results was obtained. Using this suggested SV30 automation system, the indirect determination of MLSS (Mixed-Liquor-Suspended-Solids) activation states of the aeration tank and precipitation tank is also expected to be possible. Through the test results, it was verified that the reliability of SVI determination was increased by identifying the effect of outside light after performing a test under external light interference.
10.
2016.06
서비스 종료(열람 제한)
A manufacturing method is proposed for a sorbent material comprised of functional ceramic loess balls mixed with food waste and regenerated activated carbon. The physical characteristics and adsorption performance were also evaluated. Adding activated carbon improved the porosity and increased the specific surface area of the balls. The iodine-adsorbing capacity was evaluated with different mixing ratios of activated carbon. The capacity was improved as the mixing ratio was increased. The activated carbon was regenerated through a high-temperature burning process after reaching the breakthrough point. A column test was conducted to examine the methylene blue adsorption, and the adsorption rate also increased with the activated carbon mixing ratio. At mixing ratios of above 5%, the adsorption rate showed a high increase in the early stage and reached equilibrium after 6 minutes of reaction. However, it was impossible to reach the equilibrium state without activated carbon in the loess balls. Thus, it is apparent that activated carbon plays an important role in improving the adsorption efficiency. The optimum mixing ratio of activated carbon was 5%. At this ratio, the iodine adsorption rate showed a moderate rise, the adsorption efficiency was relatively high, and the methylene blue adsorption reached equilibrium.
11.
2016.06
서비스 종료(열람 제한)
The purpose of this study was to analyze the physicochemical characteristics of bottom-ash recycling from municipal solid waste incineration (MSWI) and investigate the possibility of the use of bottom ash for Lightweight Aggregate for Structural Concrete and Bottom Ash Aggregate for Road Construction according to Korean Industrial Standards (KS). Samples were taken from the MSWI bottom ash collected at the resource recovery facilities “A” and “B.” In the results, both samples did not satisfy the criteria of the particle sizes. In particular, the two samples failed to comply with the physical and chemical characteristics criteria of the Lightweight Aggregate for Structural Concrete. On the other hand, both bottom ash samples met the physical characteristics criteria of the Bottom Ash for Road Construction. Therefore, the recycling of Bottom Ash Aggregate for Road Construction can be more a suitable method for recycling, provided that proper pre-treatment as a screening process for bottom ash is performed.
12.
2016.06
서비스 종료(열람 제한)
The utilization of renewable energy will be an inevitable situation in the future because of the acceleration of climate change and depletion of fossil fuels. Waste and biomass are major sources of renewable energy. In the near future, biomass will become the main resource of renewable energy in the world. However, in case of Korea, obtaining a stable supply of biomass is difficult. To overcome this problem, we need to import biomass from other countries. Palm empty fruit bunch (EFB) is known to be a good biomass resource, which is treated by either landfill or incineration in Indonesia and Malaysia. EFB could be used as feedstock for gasification for energy recovery as a gas fuel. Generally, biomass gasification has more stable operation than waste gasification. Nevertheless, biomass gasification generates lots of tar in syngas because of the lignin content in biomass, which may cause problems for gas engines and other processes. In this study, gasification experiments as well as qualitative analysis were conducted for determining syngas characteristics with tar content. Tar sampling and analysis were performed under various conditions by changing the flow rate, sampling time, and sampling gas flow. Measuring the tar content in syngas during the gasification process was also proposed
