Dinesh Pokhrel - Academia.edu (original) (raw)

Papers by Dinesh Pokhrel

Journal of the Indian Institute of Science, 2021

Over the last few decades, landfill design and operational practices have evolved. Current landfi... more Over the last few decades, landfill design and operational practices have evolved. Current landfill waste cells include innovative features that eliminate most of the negative environmental impacts associated with waste disposal on land. This review focuses on some of the historical and recent advances in waste cell design and operational practices that minimize greenhouse gas (GHG) emissions associated with landfills that accept biodegradable organic waste and maximize energy and resource recovery from waste cells. Here, we emphasize innovative practices such as the operation of a waste cell as a landfill bioreactor with leachate recirculation to maximize landfill gas production and increase the rate of waste stabilization, controlling GHG emissions during filling of the waste cell, and mining of waste cells to recover recyclables and reuse waste residue for energy recovery and other beneficial uses.

Journal of Hazardous, Toxic, and Radioactive Waste, 2020

Abstract The water balance performance of evapotranspirative landfill biocovers (ET-LBCs) under C... more Abstract The water balance performance of evapotranspirative landfill biocovers (ET-LBCs) under Canadian cold climate conditions is evaluated by constructing seven lysimeters at a field site in Alb...

New Horizons in Biotechnology, 2003

Replacement of conventional tertiary treatment components by membrane filtration was the first st... more Replacement of conventional tertiary treatment components by membrane filtration was the first step of membrane application in water and wastewater treatment processes. Depletion of water resources, increasing water price and stringent regulation caused the development of various combination of membrane with other conventional treatment components. Membrane bioreactor is becoming one of such flourishing technology in water and wastewater treatment field. Researches are underway to find the most efficient and economical combination of biological and membrane processes for the purpose of water recycle and reuse. Based on the literature review and field experimental studies, submersible bioreactors are found economical compared with other combinations due to its low energy requirements and compact size. High energy saving, low F/M ratio, higher percentage of COD, BOD, nitrogen, pathogen removal are some of the advantages of membrane bioreactor.

Chemical Engineering Journal, 2011

... 8947(11)00300-7 DOI: doi:10.1016/j.cej.2011.03.013 Reference: CEJ 7843 To appear in: Chemical... more ... 8947(11)00300-7 DOI: doi:10.1016/j.cej.2011.03.013 Reference: CEJ 7843 To appear in: Chemical Engineering Journal Received date: 11-8-2010 Revised date: 6-2-2011 Accepted date: 7-3-2011 Please cite this article as: D. Pokhrel, P. Hettiaratchi, S ... [20] 2/3a Marshall [18] 3 ...

Waste Management and Research, 1999

The methane oxidizing capacity of land®ll cover soils was investigated through column and batch e... more The methane oxidizing capacity of land®ll cover soils was investigated through column and batch experiments by simulating conditions that are usually encountered in tropical climates. The rate of oxidation was monitored at different temperatures and moisture contents. It was observed that a low moisture content of 6% produced negligible oxidation, whereas oxidation rates were at a maximum at moisture contents between 15 and 20%. Temperature was found to be a dominant parameter which controlled the oxidation rates. The optimum temperature was between 30 and 368C. In the column tests, the temperature in¯uenced the methane oxidation capacity indirectly by causing the topsoil surface to become totally dry, resulting in almost zero oxidation in spite of aerobic conditions. Although some increase in oxidation rate was observed, a higher concentration of methane could not produce a corresponding increase in oxidation rates, indicating the limiting capacity of the soil to oxidize methane. A depth pro®le of the gas in the column system indicated that the depth of maximum oxidation was around 15 to 40 cm under normal test conditions. Experimental results indicated that the topsoil, if maintained at an optimum moisture content, could also produce a higher oxidation capacity. The results of this experimental program indicate the possibility of maximum methane oxidation in a tropical climate if the correct moisture content is maintained at the top surface.