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In order to determine the change of their structural properties, this study carried out an ozone-treatment experiment on leachate, collected from the landfill area of D City in Chungcheongnam-do and examined the change of the chemical properties of non-biodegradable substances. The conclusions of this study are as follows.
1. Sixteen kinds of non-biodegradable compounds were found in the leachate and most of them had the characteristic of aromatic hydrocarbon. Among them dibutyl phthalate was identical with a substance included in the list of USEPA, which is classified as a mutagen that may cause the mutation of genes and disorders in chromosomes. In addition, 2,5-Cydohexadiene-1,4-dione, 1,2-Benzenedicarboxylic acid and butyl octyl ester were found to be similar to substances listed by USEPA.
2. According to the result of analyzing the chemical change of non-biodegradable substances after ozonation, 15 kinds of compounds were observed after 10min of ozonation, which increased to 17 after 30min and again decreased to 13 after 60min. The decrease may be because ozone oxidizes organic matters by reacting with parts of weak molecular binding such as C-C double bond of and aromatic rings and decomposes them into aldehyde, simple organic matters and CO₂.
3. According to the result of analyzing structural changes before and after ozonation using GC-MS, cyclic compounds and aromatic compounds were observed in the original water and aliphatic compounds were newly observed after ozonation. In addition, through ozonation, humic substances of high molecular weight were oxidized and decomposed and produced low-molecular compounds such as aldehyde, ketone and carboxyl acid and highly biodegradable aliphatic carbon, which suggests the bio-degradability of non-biodegradable substances.
1. Sixteen kinds of non-biodegradable compounds were found in the leachate and most of them had the characteristic of aromatic hydrocarbon. Among them dibutyl phthalate was identical with a substance included in the list of USEPA, which is classified as a mutagen that may cause the mutation of genes and disorders in chromosomes. In addition, 2,5-Cydohexadiene-1,4-dione, 1,2-Benzenedicarboxylic acid and butyl octyl ester were found to be similar to substances listed by USEPA.
2. According to the result of analyzing the chemical change of non-biodegradable substances after ozonation, 15 kinds of compounds were observed after 10min of ozonation, which increased to 17 after 30min and again decreased to 13 after 60min. The decrease may be because ozone oxidizes organic matters by reacting with parts of weak molecular binding such as C-C double bond of and aromatic rings and decomposes them into aldehyde, simple organic matters and CO₂.
3. According to the result of analyzing structural changes before and after ozonation using GC-MS, cyclic compounds and aromatic compounds were observed in the original water and aliphatic compounds were newly observed after ozonation. In addition, through ozonation, humic substances of high molecular weight were oxidized and decomposed and produced low-molecular compounds such as aldehyde, ketone and carboxyl acid and highly biodegradable aliphatic carbon, which suggests the bio-degradability of non-biodegradable substances.
목차
ABSTRACT
Ⅰ. 서론
Ⅱ. 실험방법 및 장치
Ⅲ. 실험결과 및 고찰
Ⅴ. 결론
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