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J Korean Soc Environ Eng > Volume 41(8); 2019 > Article
J Korean Soc Environ Eng 2019;41(8): 431-439. doi: https://doi.org/10.4491/KSEE.2019.41.8.431
폐타이어의 저온 열분해시 발생되는 오염물의 거동 특성
김상식
김포대학교 보건환경과
Behavior Characteristics of Pollutants Caused by Low Temperature Pyrolysis of Waste Tires
Sang-sik Kim
Department of Health & Environment, Kimpo University
Corresponding author  Sang-sik Kim ,Tel: 031-999-4158, Fax: 031-999-4775, Email: sskim@kimpo.ac.kr
Received: July 2, 2019;  Revised: August 9, 2019;  Accepted: August 13, 2019.  Published online: August 31, 2019.
ABSTRACT
Objectives:
The purpose of this study is to develop environmentally stable treatment process by low temperature pyrolysis of waste tires.
Method:
The weight of the waste tire was measured and charged to the pyrolysis furnace and pyrolyzed at a low temperature in a vacuum state. In order to remove the pollutants generated in the pyrolysis furnace, the post treatment process consisted of a gas scrubber, a condenser, a waste heat boiler, and a filter. The pollutants investigated for this study are 28 air pollutants such as sulfur compounds, nitrogen compounds, and ammonia, complex odor, 12 designated odorous substances, dioxin, and 13 water pollutants including BOD, CODMn contained in condensed water.
Results and Discussion:
The waste tire charged to the pyrolysis furnace was 100 kg, which was run three times for 7 hours. Stable decomposition of the waste tire in pyrolysis furnace occurred around 320℃, that could be confirmed by the exhaust gas of pyrolysis furnace. Out of 28 air pollutants, 10 substances such as CO, HCl and NOx were detected, and 18 substances such as fluorine compounds, phenol and arsenic were not detected. The air pollutants generated from the pyrolysis furnace were stably treated in the post-treatment process to below the legal limits. The complex odor generated when the waste tires were treated in the pyrolysis furnace was 42,800 dilution. At the final outlet, the intensity of the complex odor was 300 dilution, which was reduced by 99% compared to the initial concentration. 11 designated odor substances such as ammonia, hydrogen sulfide, and n-valeric acid were detected. Ammonia and acetaldehyde were 99.3 and 94.5% removed from the scrubber, respectively, and the remaining material was stably removed from the filter. The dioxin concentration at the final outlet was 0.002 ng-TEQ/Sm3, much lower than the emission limit of 5 ng-TEQ/Sm3.
Conclusions:
Ten out of 28 air pollutants and eleven out of 22 designated odorous substances were detected. The NH3 concentration in the pyrolysis furnace was reduced by 97.2% in the scrubber, and the HCl concentration was reduced to 99.7% after passing through the filter. Ammonia and acetaldehyde, designated odor substances, were removed by 99.3% and 94.5% respectively in the gas scrubber. At the final outlet, the intensity of the complex odor was 300 dilutions, which is a 99% decrease compared to the initial concentration. The dioxin concentration at the final outlet was 0.002 ng-TEQ/Sm3, which was very allowable level to the legal.
Key Words: Waste Tire, Waste Tire pyrolysis, Low-Temperature Pyrolysis, Contaminant Behavior
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