• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
• /
• pp.186-193
• /
• 2009

Since its opening in 1992, Sudokwon Landfill has become a landfill in which wastes generated from more than 22 million people are treated and disposed of. Its first phase landfill was closed in 2000 and the second phase landfill is in operation since then. The Korean environmental policies on refuse have drastically evolved for the last decade or so. From merely safe containment of wastes, the utilization of them as a source for energy generation and the minimization of waste volume to be filled in landfills are in the mainstream. Keeping in pace with the new trends, several challenging projects are in their way to blossom in Sudokwon Landfill. This paper briefs some important activities in the landfill. They are (1) geotechnical issues related to the construction and maintenance of the $1^{st}$ and $2^{nd}$ Landfills and (2) landfill gas and bioreactor which are recently emerging in the market.

• Environmental Engineering Research
• /
• 제17권4호
• /
• pp.191-196
• /
• 2012

Analysis of hydrological safety as well as the determination of many substance concentrations are necessary when bioreactor systems are introduced to landfill operations. Therefore, hydrological and substance balance model was developed since it can be applied to various bioreactor landfill operation systems. For the final evaluation of the model's effectiveness, four different methods of injections (leachate alone, leachate and organic waste water, leachate and reverse osmosis concentrate, and all the above three combination) was applied to 1st landfill site of Sudokwon landfill. As a result, the water content of the hypothetical cases for four different systematic bioreactors is projected to be increased up to 35.5% in next 10 years, and this indicated that there will be no problems in meeting the hydrological safety. Also, the final $Cl^-$ concentration after 10-yr time period was projected to be between from minimum 126 to maximum 3,238 mg/L, which could be still a decrease from the original value of 3,278 mg/L. According to the proposed model, whether the substance concentration becomes increased or decreased largely depends on the ratio of initial quantity of inner landfill leachate and the rate of injection.

• 유기물자원화
• /
• 제12권1호
• /
• pp.104-109
• /
• 2004

본 연구는 공기주입에 의한 고형 폐기물의 빠른 안정화를 달성할 수 있는 매립지의 호기성 공정을 평가하는 것을 목표로 하였다. 실험은 매립지에서 최적의 공기주입방법을 평가하기 위해 선별토사를 충전한 4개의 모의 매립조(혐기성, 1PV(pore volume/day)공기주입, 5PV 공기주입, 10PV 공기주입)를 운영하였다. 선별토사를 충전한 bioreactor를 호기성으로 운전한 경우에 공기를 주입하지 않은 bioreactor에 비해 유기물 분해가 뛰어난 것으로 나타났다. 매립가스의 발생량 및 조성변화와 soil respiration test 결과로부터 5 PV/day으로 공기를 주입한 bioreactor가 유기물 분해율이 가장 높은 것으로 나타났다.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제21권2호
• /
• pp.22-28
• /
• 2016

In order to evaluate landfill stabilization based on organic carbon, stoichiometric analysis and a biological methane potential (BMP) test based on modeling were performed at the 2^nd Sudokwon Landfill Site. Mass balance analysis through a BMP test proved to be more adaptable for evaluation, and it showed that 28.9% of landfill organic carbon was expected to remain by 2046, 30 years after landfill closure. The organic carbon ratio of total landfill waste for 2046 is forecasted as 2.9% in demolition waste and 5.1% in household waste, and, if one were to consider plastic as an organic waste, the ratios would increase to 15.9% and 28.3%, respectively. Therefore, it seems that organic matter biodegradation facilitating measures such as bioreactor landfill technology and preemptive recovery of combustible waste are necessary to shorten post closure management periods and to meet the landfill stabilization guidelines more safely.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제29권4호
• /
• pp.1-11
• /
• 2024

This study evaluated a method for prompt and periodic monitoring of moisture content in the waste layer of a landfill using a Time Domain Reflectometry (TDR) sensor, aimed at ensuring the stable operation of the bioreactor facility at the 2nd landfill of the SUDOKWON Landfill Site. It was found that the TDR sensor is sensitive to variables such as temperature changes and ion content in both the waste layer and leachate, indicating that a correction equation is necessary. A correction equation derived through regression analysis demonstrated a high correlation (correlation coefficient = 0.9647), and field verification experiments confirmed its reliability with an average deviation of only 1.5%. This verifies that the TDR sensor is effective for measuring and monitoring moisture content in landfills. It is also anticipated to be useful for various applications, including monitoring leachate levels, detecting leachate leakage, and assessing rainwater infiltration.

• 에너지공학
• /
• 제25권3호
• /
• pp.104-113
• /
• 2016

본 연구에서는 신기후체제 대비를 위한 온실가스 감축 수단으로써 신재생에너지원인 매립가스의 에너지이용 확대를 위해 현장 매립폐기물을 적용하여 음폐수 주입에 따른 메탄가스 생산량 증대 및 이에 따른 온실가스 감축효과를 분석하고자 하였다. 메탄가스 생산량 증대를 위해 주입하는 음폐수는 $35^{\circ}C$, pH 6으로 전처리한 후 사용하였고, 전처리 반응조는 타공성 담체가 고정된 상향류식 고정층 반응기를 이용하였다. 실제 매립폐기물을 이용한 pilot-scale 바이오리액터 운전결과 음폐수 주입시 강우를 활용한 대조군에 비해 6배의 매립가스 증가율을 보였으며, 평균 매립가스 발생량은 $56{\ell}/day/m^3$으로 $1m^3$ 매립지용적에서 연간 약 $20m^3$의 메탄가스가 생산 가능함을 확인하였다. 이를 에너지원으로 활용할 경우 25만 $m^3$ 이상의 중규모 매립지에 적용시 사업성이 확보될 뿐만 아니라 기 등록되어 있는 매립가스 활용 CDM 사업 및 방법론을 기준으로 폐기물 처리용량 25만 $m^3$ 규모의 매립지를 대상으로 온실가스 감축량을 산출한 결과 연간 약 4~5만 톤의 온실가스 감축효과가 있음을 확인하였다.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제26권5호
• /
• pp.39-48
• /
• 2021

Analysis of the change in water content and distribution was conducted according to the supply of recirculation water to a landfill. An excavation sample analysis showed that the recirculation water injection zone had water content 8.8% point higher than that of the non-injection zone, after 8 months of operation. And due to the influence of recirculation water supply by vertical wells in injection zones, the water content increases along with depth more clearly than non-injection zone. According to an electrical specific-resistivity survey after 13 months of operation, the water content got higher towards the bottom of the landfill. The water transmission coefficient is 8.72×10^-4 cm/sec for injection zones and 3.36×10^-5 cm/sec for the intermediate cover layer; analysis shows that the intermediate cover layer may affect the penetration velocity of water supplied by the horizontal injection tube. For the scientific design and operation of re-injection facilities, it was deemed necessary to follow-up research on the residence time and behavior of re-injection water considering the ratio of recirculation water supply in horizontal and vertical tubes, and pitcher coefficient of intermediate and waste layers.

• 유기물자원화
• /
• 제15권1호
• /
• pp.171-177
• /
• 2007

메탄활성 침출수가 매립폐기물 분해에 미치는 영향을 알아보기 위해 내경 30cm, 높이 200cm, 실용량 140L의 원통형 PVC로 모형매립조 4기를 제작하였으며, 침출수의 생물학적처리와 재순환을 위한 혐기화조를 내경 20cm 높이 30cm로하여 2기 제작하였다. L1은 일반적인 매립지를 모사하기 위해 재순환을 행하지 아니하였고, L2는 침출수를 우수의 2배인 1,068ml로 재순환하였다. L3와 L4는 발생된 침출수를 $35{\pm}1^{\circ}C$로 유지되는 암실에서 1주일간 혐기성소화조에서 소화시킨 후 상등수를 L3, L4에 각각 1,064ml, 2.128ml 재순환하였다. 누적메탄발생량이 L3와 L4가 L1과 L2에 비해 약 3배 높게 발생하였으며, 메탄활성 침출수의 재순환량이 더 많은 L4이 L3보다 1.23배 높게 나타났다. 이는 메탄활성 침출수 재순환이 재순환되는 메탄균에 의해 분해가 더 활성화 된 것으로 판단되며, 메탄활성 침출수의 재순환 양에 따라 메찬회수율이 다르다는 것을 알 수 있다.