건설폐기물 분리매립 및 생활폐기물과의 혼합매립에 의한 매립가스 발생 특성
Characteristics of Landfill Gas Generation by Separate Landfill of Construction Waste and Mixed Landfill with Household Waste
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Landfill gas (LFG) generation characteristics in a construction waste landfill zone (block E) and mixed landfill zone(block A) were analyzed. During the period from October 2018 to April 2022, a total of 936×103 and 1,001×103 tons of waste weredisposed in block E and block A, respectively. Out of this, 27.1% and 55.6% were biodegradable waste in block E and block A,respectively. The landfill masses of the two blocks were converted to be comparable. Then, the biodegradable waste and organiccarbon were estimated by element analysis, biodegradable carbon by biochemical methane potential experiment (DC), and sulfate ionby acid decomposition. Results showed that biodegradable waste, organic carbon, biodegradable carbon, and sulfate ions in block Awere 2.1, 1.6, 5.2, and 0.4 times greater than those in block E, respectively. The amount of LFG generated by block A was 4.8 timesgreater than that by block E. The average concentrations of methane (CH4) were 60.8% and 60.9% in block E and block A,respectively, which were unrelated to the nature of disposed waste. The average concentrations of hydrogen sulfide (H2S) weresignificantly high in block E (4,489 ppm) and block A (8,478 ppm). As the DC/SO42- of block E and block A were 0.35 and 4.56,respectively, increase in DC/SO42- caused increase in not only the total amount but also the concentration of H2S generated.
Abstract
Landfill gas (LFG) generation characteristics in a construction waste landfill zone (block E) and mixed landfill zone(block A) were analyzed. During the period from October 2018 to April 2022, a total of 936×103 and 1,001×103 tons of waste weredisposed in block E and block A, respectively. Out of this, 27.1% and 55.6% were biodegradable waste in block E and block A,respectively. The landfill masses of the two blocks were converted to be comparable. Then, the biodegradable waste and organiccarbon were estimated by element analysis, biodegradable carbon by biochemical methane potential experiment (DC), and sulfate ionby acid decomposition. Results showed that biodegradable waste, organic carbon, biodegradable carbon, and sulfate ions in block Awere 2.1, 1.6, 5.2, and 0.4 times greater than those in block E, respectively. The amount of LFG generated by block A was 4.8 timesgreater than that by block E. The average concentrations of methane (CH4) were 60.8% and 60.9% in block E and block A,respectively, which were unrelated to the nature of disposed waste. The average concentrations of hydrogen sulfide (H2S) weresignificantly high in block E (4,489 ppm) and block A (8,478 ppm). As the DC/SO42- of block E and block A were 0.35 and 4.56,respectively, increase in DC/SO42- caused increase in not only the total amount but also the concentration of H2S generated.
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