• Environmental Engineering Research
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• 제22권2호
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• pp.157-161
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• 2017

Simultaneous treatment of food waste leachate and power generation was investigated in an air-cathode microbial fuel cell. A TCOD removal efficiency of $95.4{\pm}0.3%$ was achieved for an initial COD concentration of 2,860 mg/L. Maximum power density ranged was maximized at $1.86W/m^3$, when COD concentration varied between 60 mg/L and 2,860 mg/L. Meanwhile, columbic efficiency was determined between 1.76% and 11.07% for different COD concentrations. Cyclic voltammetric data revealed that the oxidation peak voltage occurred at -0.20 V, shifted to about -0.25 V. Moreover, a reduction peak voltage at -0.45 V appeared when organic matters were exhausted, indicating that reducible matters were produced during the decomposition of organic matters. The results showed that it was feasible to use food waste leachate as a fuel for power generation in a microbial fuel cell, and the treatment efficiency of the wastewater was satisfied.

• 한국환경과학회지
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• 제12권10호
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• pp.1095-1100
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• 2003

In this study, it was performed using submerged nonwoven bioreactor(SNBR) for removal of organic matter, nitrogen and phosphate under different aeration intervals(intermittent aeration). We applied the SNBR at the cheap nonwoven fiber module instead of the expensive membrane. The SUBR was mainly made up of an activated sludge reactor and a transverse flow nonwoven module, with an innovative configuration being in application between them. In case of sewage, the aeration conditions experimented consist of continuous aeration and 60min/60min, 120min/60min, 120min/120min of aeration/nonaeration time intervals, respectively. In case of landfill leachate, the intermittent aeration condition was 120min/120min at aeration/nonaeration. Consequently, a high COD removal rate (about 94%) was achieved in sewage and leachate. Although nutrient removal rate was relatively high without any additional chemicals.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.343-346
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• 2002

The chemical compatibility of leachate with the two natural materials was analyzed by performing the hydraulic conductivity test. The selected liner materials were natural marine clay and weathered soil sampled from Kimpo wastefill and Daehwa Dong, Kyonggi Do, respectively. PARAFIX, which is mainly composed of paraffin, cement, stearic acid, PVA etc., was used as solidifying agent. The chemical solutions used in the test were 10% acetic acid, 10% methanol, and real leachate from Kimpo wastefill and the results of tests were compared with that of distilled water. The results of tests show that hydraulic conductivity of solidified clay was increased slightly with permeation of acetic acid, methanol and the increase of hydraulic conductivity was not shown with permeation of leachate, distilled water and in case of weathered soil. Based on the tests, it is ascertained that the tested liner materials can be stable with the solution of low concentration.

• 한국물환경학회지
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• 제18권2호
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• pp.169-187
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• 2002

The effects of important parameters such as reaction time and pH on the Fenton's process were evaluated using a batch reactor. It was proven that organic materials and heavy metals in leachate could be successfully removed by Fenton's reagent. Favorable operation conditions were investigated. It was observed that the reaction between ferrous iron and hydrogen peroxide with the production of hydroxyl radical was almost complete in 10 minutes. That is, the oxidation of organic materials by Fenton's reagent was so fast that it was complete in 30 minutes with batch experiments. With the formation of carbonic acid, pH of the batch reactor decreased to favorable acidic conditions without acid addition. The oxidation of organic materials in the leachate showed a pH dependence and was most efficient in the pH range of 2-3.

• Membrane and Water Treatment
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• 제13권1호
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• pp.21-28
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• 2022

The use of plastics in our everyday lives have been drastically increased during the last few decades. However with the usage of commercial plastic products there is a possibility of microplastic consumption, due to the fragmentation of the products. Additionally, the potential for microplastic ingestion may also be increased by using damaged products. Hence, the current study was conducted to understand the potential release of micro/nano plastics and organic matter from damaged teabags. To check the leakage tendency, the amount of damage to the tea bags from 1-10 cm were tested along with temperatures of 25-70℃, and exposure times from 5 min to 1 hr was tested. Release of fibrous micro/nanoplastics, and organic leachate from the damaged teabags were observed to understand the outflow conditions. Results showed that with the increased degree of damage, temperature, and exposure time increased the release of fiberous matter, where the increase of temperature, and exposure time increased organic leachate. Additional analysis confirmed the leachate of nylon polymers into the heated water.

• Environmental Engineering Research
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• 제7권3호
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• pp.129-136
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• 2002

• 한국환경과학회지
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• 제17권10호
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• pp.1129-1137
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• 2008

We investigated the ecological characteristics of reed populations growing in Korea and tried to select reed populations showing better growth patterns in waste landfill leachate. To examine the growth characteristics, 14 reed populations from various habitats were collected. Four reed populations were from inland reclaimed habitats, 4 reed populations from brackish or salt marsh habitats, and 6 reed populations from fresh water habitats. Total plant biomass after the treatment with landfill leachate showed that Daebudo and Nanjido reed populations had the higher biomass with 3755 g DW/pot and 3305 g DW/pot, respectively. Reed populations being sampled from the higher salinity and landfill habitats had relatively higher total biomass than that of other reed populations. Especially reed populations from landfill habitats showed higher biomass. Reed populations from Songjiho and Daebudo, which were believed to have tolerance to salt stress, also showed good growth patterns. Population from the fresh water habitats exhibited relatively lower tolerance to leachate treatment compared to others. From the results, we could conclude that reed populations from Nanjido and Daebudo with higher biomass and better salt tolerance were able to good candidates for purification of waste landfill leachate.

• 환경영향평가
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• 제8권2호
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• pp.9-20
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• 1999

Until 1993, Nanji landfill has been the main solid waste treatment facility for Seoul, which is the capital of Korea. Since the landfill has not been properly lined, soil and ground water around the landfill has been contaminated. Due to the proximity, it has been speculated that the water quality of the Han River would have been also influenced by the leachate. In order to illuminate this, HELP model to estimate the quantity of the leachate from Nanji landfill and RMA model to simulate the change of water quality in Han River were applied in this research. The result indicates that the quantity of leachate from Nanji landfill has been overestimated by previous works and it was due to the failure to consider the water storage capacity of the landfill. The effect from Nanji landfill leachate on the water quality, in terms of COD input, proves to be smaller than those from other tributaries and influents to the River and the effect is larger when the flow of the River is reversed due to the tide.

• 유기물자원화
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• 제26권2호
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• pp.19-32
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• 2018

본 연구는 침출수 재순환에 의한 매립가스에 대한 메탄가스 농도에 어떠한 영향이 있는지 분석하였다. 실험대상 매립장 지역의 2010~2016년간 월평균 총강수량은 130.9mm, 2017년 6월 총강수량 73.7mm 이었다. 이러한 기상청 자료를 근거로 실험대상 매립장의 수분함수율은 낮을 것으로 예상되었다. 실험대상 매립장에 10개의 포집공을 선정하여 5톤의 침출수를 나누어서 투입하면서 매립가스 변화특성을 조사하였다. 침출수 투입하기 전 10개의 메탄가스 농도(평균) 투입전 30.14%, 투입후 메탄가스 농도(평균) 24.66%(6월 21일), 31.51%(6월 24일), 36.68%(7월 1일), 52.47%(7월 25일)로 메탄가스 농도가 증가하였다. 본 실험대상 매립장의 경우 5톤의 침출수를 투입한 결과 매립지의 유기물질 분해에 필요한 최적 함수율 50~65% 범위를 유지하는 것으로 판단된다.

• 한국지반공학회논문집
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• 제15권6호
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• pp.99-109
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• 1999

국내 일반폐기물 매립지의 경우 함수비가 높은 쓰레기의 특성으로 인하여 매립지 내부에 누적수위가 발생하는 경우가 많고 따라서 매립된 복토재와 쓰레기의 수리특성의 파악은 매우 중요하다. 폐기물 매립지의 설계시공 과정에서 매립지 하부차수재와 주변지반의 수리특성에 대해서는 많은 지반조사와 연구가 되어있으나 매립지내부 쓰레기와 복토재의 수리적특성 및 흐름거동에 대한 조사 및 해석은 국내외적으로 되어있지 않다. 본 논문에서는 국내 대표적 폐기물 매립지에 대한 현장 지반조사로부터 쓰레기와 복토재의 지반공학적 특성을 파악하고 양수시험(pumping test)과 순간충격시험(slug test)을 이용하여 매립된 쓰레기와 복토재의 수리특성을 파악하였다. 현장지반조사 결과 매립된 쓰레기의 다짐정도는 실내시험의 최대 단위중량 값을 상회하는 것으로 나타났으며 쓰레기에 의하여 덮여진 중간 저투수성 복토재는 침출수와 가스의 수직 흐름을 방해하고 있는 것으로 보여진다. 현장 양수시험과 순간충격시험의 투수계수는 상호간에 잘 일치하고 문헌에서 나타난 잘 다져진 쓰레기의 투수계수 범위에 있는 것으로 나타났다.