Anaerobic Digestion Process for the Treatment of Sisdole Landfill Leachate in Nepal

Along with the population, organic waste has been rising significantly in recent years. The resulting uncontrollable waste loads and conventional methods of waste treatment have begun to cause chaos at the landfill sites. This study evaluates the performance of an anaerobic digestion process using batch reactors for the treatment of landfill leachate collected from the Sisdole landfill site in Nuwakot, Nepal. A lab-scale anaerobic batch reactor was set up in Kathmandu University, Nepal. Using an anaerobic digestion process, COD values of the leachate decreased from 2230 mg/l to 1125 mg/l (removal efficiency of ~50%), whereas total solids concentration decreased from 1925 to 925 mg/L under a retention time of 10 days. In addition, Monod’s model was established to design an Anaerobic Sequential Batch Reactor to achieve better performance, resulting in 85% removal efficiency for the leachate treatment. Overall, this study analyzed the anaerobic digestion process on the landfill leachate of Sisdole, and modeled the process to identify the conditions required for increasing the efficiency of treatment of Sisdole landfill leachate.

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Process Simulation of Anaerobic Digestion Process for Municipal Solid Waste Treatment

Anaerobic Digestion Processes - Green Energy and Technology ◽

10.1007/978-981-10-8129-3_5 ◽

2018 ◽

pp. 71-83

Author(s):

Noorlisa Harun ◽

Wan Hanisah W. Ibrahim ◽

Muhamad Faez Lukman ◽

Muhammad Hafizuddin Mat Yusoff ◽

Nur Fathin Shamirah Daud ◽

...

Keyword(s):

Anaerobic Digestion ◽

Municipal Solid Waste ◽

Solid Waste ◽

Process Simulation ◽

Waste Treatment ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Solid Waste Treatment

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The influence of the anaerobic digestion process on the sewage sludges rheological behaviour

Water Science & Technology ◽

10.2166/wst.1997.0394 ◽

1997 ◽

Vol 36 (11) ◽

pp. 61-67 ◽

Cited By ~ 12

Author(s):

Paulo Santos Monteiro

Keyword(s):

Anaerobic Digestion ◽

Sewage Sludge ◽

Inorganic Compounds ◽

Rheological Behaviour ◽

Test Facility ◽

Substantial Part ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Solids Concentration ◽

Set Up

During the anaerobic digestion process, a significant part of the organic matter in sewage sludge is decomposed to form other organic and inorganic compounds in dissolved form. This biological transformation of a substantial part of the organic solids has, certainly, a strong influence on the rheological characteristics of the sludge. In this paper a test facility was set up to simulate sewage sludge digestion and periodic observations on the evolution of the sludge characteristics were carried out. Results of this study show that important changes on the sludge rheological behaviour occur during anaerobic digestion and that the evolution of those changes is related to the degree of digestion. Moreover, it is shown that the verified high degree of physical changes can not be explained only by the total solids concentration variation and two hypotheses are proposed to explain those changes.

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Development of a new type of anaerobic digestion process equipped with the function of nitrogen removal

Water Science & Technology ◽

10.2166/wst.2004.0751 ◽

2004 ◽

Vol 49 (5-6) ◽

pp. 173-179 ◽

Cited By ~ 18

Author(s):

T. Noike ◽

I.S. Goo ◽

H. Matsumoto ◽

T. Miyahara

Keyword(s):

Anaerobic Digestion ◽

Nitrogen Removal ◽

Ammonium Nitrogen ◽

Nitrogen Gas ◽

Acetic Acid Production ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Solids Concentration ◽

Low Load ◽

New Type

In order to develop a new type of anaerobic digestion process equipped with a nitrogen removal function, denitrification of nitrate nitrogen (NO3-N) in anaerobic acidogenesis of organic fraction of municipal waste (OFMSW) was investigated by two semi-continuous reactors. Reactor 1 and Reactor 2 were fed by 3% and 7% of solids concentration of synthetic garbage, respectively. Generation of nitrogen gas (N2) and ammonium nitrogen (NH4-N) was simultaneously observed in the low load of nitrate (NO3-N) (below 0.68g NO3-N/L). In Reactor 1, ammonium nitrogen generation decreased as the addition of nitrate increased. Finally, the increase of the addition of nitrate resulted in the increase of acetic acid production.

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Effect of Varying Solids Concentration and Organic Loading on the Performance of Temperature Phased Anaerobic Digestion Process

Water Environment Research ◽

10.2175/106143002x139857 ◽

2002 ◽

Vol 74 (2) ◽

pp. 142-148 ◽

Cited By ~ 20

Author(s):

Scott R. Vandenburgh ◽

Timothy G. Ellis

Keyword(s):

Anaerobic Digestion ◽

Organic Loading ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Solids Concentration

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Effect of a Starch-Rich Industrial Wastewater on the Acid-Phase Anaerobic Digestion Process

Water Environment Research ◽

10.2175/106143005x51941 ◽

2005 ◽

Vol 77 (4) ◽

pp. 366-371 ◽

Cited By ~ 9

Author(s):

Panagiotis Elefsiniotis ◽

David G Wareham ◽

Marcus O Smith

Keyword(s):

Anaerobic Digestion ◽

Industrial Wastewater ◽

Anaerobic Digestion Process ◽

Digestion Process

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A Mathematical Model for the Anaerobic Digestion Process Applied to a Mixture of Night Soil and Septic Tank Sludge

Water Science & Technology ◽

10.2166/wst.1986.0295 ◽

1986 ◽

Vol 18 (7-8) ◽

pp. 239-248 ◽

Cited By ~ 2

Author(s):

Sung Ryong Ha ◽

Dwang Ho Lee ◽

Sang Eun Lee

Keyword(s):

Mathematical Model ◽

Anaerobic Digestion ◽

Biomass Concentration ◽

Gas Production ◽

Septic Tank ◽

Volatile Acid ◽

Hydraulic Residence Time ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Proposed Model

Laboratory scale experiments were conducted to develop a mathematical model for the anaerobic digestion of a mixture of night soil and septic tank sludge. The optimum mixing ratio by volume between night soil and septic tank sludge was found to be 7:3. Due to the high solids content in the influent waste, mixed-liquor volatile suspended solids (MLVSS) was not considered to be a proper parameter for biomass concentration, therefore, the active biomass concentration was estimated based on deoxyribonucleic acid (DNA) concentration in the reactor. The weight ratio between acidogenic bacteria and methanogenic bacteria in the mixed culture of a well-operated anaerobic digester was approximately 3:2. The proposed model indicates that the amount of volatile acid produced and the gas production rate can be expressed as a function of hydraulic residence time (HRT). The kinetic constants of the two phases of the anaerobic digestion process were determined, and a computer was used to simulate results using the proposed model for the various operating parameters, such as BOD5 and volatile acid concentrations in effluent, biomass concentrations and gas production rates. These were consistent with the experimental data.

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