Quantitative leachate estimation from a pilot-scale lysimeter study

Manandhar, Dinesh Raj; Krishnamurthy, V.; Kasaju, Yamuna Shanker

doi:10.1504/ijewm.2009.027399

Cited by 2 publications

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“…Water management is governed by water input and output from landfill. Consideration and general conclusions shall be drawn from a research work using pilot scale lysimeter in Nepal, which serves as a case study for better understanding [4].…”

Section: Objective and Scopementioning

confidence: 99%

Estimation of leachate from a pilot scale lysimeter

Manandhar

Hogland

Krishnamurthy

et al. 2013

Kathmandu University J of Sci, Engineering & Technol

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The most important component of solid waste management is long-term safe and reliable disposal of solid waste in sanitary landfills. Leachate formed in landfills needs proper management. The biodegradable portion of waste is largely responsible for the production of leachate and landfill gas. This paper presents the outcome of the research on the water management of landfill in Nepal using a designed and built pilot scale field lysimeter model. The leachate production from the lysimeter as an effect of climatological factors is assessed. The Hydrologic Evaluation of Landfill Performance (HELP) model is used to compute estimates of water balances. Simulation of the model indicates that the evapotranspiration (ET) is nearly constant and do not follow the precipitation and percolation trend. Also the evapotranspiration component in this case, is not high. This may be due to the small surface area of lysimeter and larger portion of the leachate percolated before evaporation could take place. The model has been calibrated for the local situation with the limited observed data of leachate generation from the lysimeter. However the trend of leachate generation on HELP simulation and Actual Data seem to be similar during month of October to December season, but during June to September, the trend shows higher actual percolation rate compared to the model output. This may be due to the higher value of permeability of barrier soil (in the range of 10-5 cm/s), which should be generally in the range of 10-7 cm/s or lower. The rainy season during June to September may be another reason, when soil is wet most of the time. The annual data shows that percolation is about 81-84% of precipitation amount, whereas evapotranspiration is about 15-19%. The application of the model may be a valuable tool to determine strengths and weaknesses of designing and operating of landfills in developing countries like Nepal. Kathmandu University Journal of Science, Engineering and Technology Vol. 8, No. II, December, 2012, 93-100 DOI: http://dx.doi.org/10.3126/kuset.v8i2.7331

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Section: Objective and Scopementioning

confidence: 99%

Estimation of leachate from a pilot scale lysimeter

Manandhar

Hogland

Krishnamurthy

et al. 2013

Kathmandu University J of Sci, Engineering & Technol

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“…An average temperature of I 6 ° C over 5 years and an average solar radiation computed to be 78.56 MJ/m 2 /day in Kathmandu. The research under discussion focuses particularly on the leachate production in a landfill, Consideration and general conclusions shall be drawn from a research work using lysimeter in Nepal, which serves as a case study for better understanding [3].…”

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confidence: 99%

Estimation of leachate production from a pilot scale lysimeter in Nepal

Manandhar

Khanal

2007

Eco-Tech

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More than eight million tons of solid waste is produced per day in developing countries.While Europe and industrialized countries go for high-tech solutions (e.g. modernincineration technologies), there is still a huge demand for proper landfilling in developingcountries. This paper presents the outcome of the research on the water management oflandfill in Nepal using a pilot scale lysimeter. The related leachate production as an effect ofclimatological factors is assessed. The Hydrologic Evaluation of Landfill Performance(HELP) model has been used to compute estimates of water balances. The local weather data(evapotranspiration data and daily values of rainfall, temperature and solar radiation),vegetative growth were prepared as required and variable soil and waste data (porosity, fieldcapacity, wilting point, initial moisture content and saturated hydraulic conductivity of layersand materials) have been determined.With the simulation carried out, it indicates that the evapotranspiration (ET) is nearlyconstant, but not high. This may be due to the small area of lysimeter and higher portion hasbeen percolated before evaporation could take place. The trend of leachate generation onHELP simulation seems to be similar in October to December season, but in June toSeptember, the trend shows higher percolation rate compared to the model. The annual datashows that percolation is about 81-84% of rainfall amount whereas evapotranspiration isabout 15-19%. The daily production rate of percolation is about 3.47 L/m2/day. Withinhighest rainfall days during 2000 to 2004 (88 L/m2/day), average percolation is about 5.78L/m2/day (6.5% of the rainfall).The application of the model in the developing country like Nepal has raised issue like effecton water balance by the large variation of short-tenn rainfall, which might have greater inputinto percolation.

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Quantitative leachate estimation from a pilot-scale lysimeter study

Cited by 2 publications

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Estimation of leachate from a pilot scale lysimeter

Estimation of leachate from a pilot scale lysimeter

Estimation of leachate production from a pilot scale lysimeter in Nepal

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