Showing papers on "Bioreactor landfill published in 1994"
TL;DR: In this article, the benefits of converting landfills into controlled bioreactor systems through regulated leachate generation, containment, collection, and in situ recirculation for accelerated waste stabilization and integrated biogas management are described and compared to relative costs of other management options.
80 citations
Patent•
18 Jul 1994
TL;DR: In this article, a process for improving degradation, stabilization, detoxification, and volume reduction of refuse within an unsecured landfill is described, which includes the control of ground water and extracting the ground water for use as a liquid medium to facilitate creation and recirculation of leachate.
Abstract: A process for improving degradation, stabilization, detoxification and volume reduction of refuse within an unsecured landfill. The process comprises the control of ground water and extracting the ground water for use as a liquid medium to facilitate creation and recirculation of leachate. The present process requires that landfill leachate be collected and recycled back into the landfill. The process additionally includes the injection of selected wastes and additives into the leachate, leachate enroute to be recirculated through the landfill. The materials which can be added to the leachate alter the mix of physical and chemical conditions within the landfill so as to accelerate the rate of leachate stabilization, accelerate the rate of conversion and stabilization of organic and inorganic refuse within the landfill, reduce the volume of landfill refuse, and reduce the potential toxicity of refuse. The landfill thus becomes an anaerobic biological reactor with physical-chemical treatment capabilities.
54 citations
TL;DR: Zenstein et al. as discussed by the authors showed that channeling of flow through test cells containing compacted municipal solid waste appears to be a significant flow mechanism even at low infiltration rates (0.17 mm/hr) and after steady-state conditions (infiltration = discharge) have been reached.
Abstract: Vertical moisture flow through municipal solid waste landfills has been represented primarily as one-dimensional Darcian flow in homogeneous media, though channeling of flow through large pores in the waste has been shown to be an important flow mechanism at high loading rates. Channeling of flow through test cells containing compacted municipal solid waste appears to be a significant flow mechanism even at low infiltration rates (0.17 mm/hr) and after steady-state conditions (infiltration = discharge) have been reached. Practical field capacity is significantly lower at 0.0996 than the HELP model field capacity of 0.294, while the average experimental porosity is identical to the HELP default value (0.52). Experimental unsaturated hydraulic conduc tivity values are one to two orders of magnitude higher than the HELP default value at field capacity (1.2 x 10\" cm/s), however, these values appear to be influenced by the experimental loading rate. In order to better understand the mechanisms and patterns of moisture flow in solid waste, more detailed information on the channels such as nature of flow in the channels and the spatial distribution of the channels is needed. Also, to more accurately repre sent the physical system, any new leachate generation models should account for both Darcian and channeled flow. ♦This research was funded through a grant from the Natural Science and Engineering Research Council (NSERC) of Canada. The research was further made possible by gracious in-kind support by management and staff at the West Edmonton Landfill of Waste Management Inc. of Edmonton. The comments in this article are for information and discussion purposes only and are not to be relied upon in any particular situation without the expressed written consent of the authors. 247 © 1995, Baywood Publishing Co., Inc. doi: 10.2190/JW1M-A901-L1X9-T15F http://baywood.com 248 / ZEISS AND UGUCCION
36 citations
01 Jun 1994
TL;DR: In this article, a review of leachate treatment methods for landfills is presented, focusing on the most commonly used methods for removing leachates from degrading solid waste materials.
Abstract: This article reviews landfill leachate treatment methods. Contamination of groundwater, streams, and ponds by noxious materials from landfills in particular, leachate is a problem going back to the first dump''. However, it has only relatively recently received the attention it deserves. Leachate, soluble chemical compounds removed from degrading solid waste materials, is produced when water (usually from precipitation) passes through a landfill. Its quality varies with its source, among other factors, and reported values of leachate constituents vary over a wide range. The quantity produced is primarily a function of climate, but it is also affected by landfill cover and the collection system's configuration. Because uncollected leachate may contaminate ground-water or surface water, current regulations require containment, collection, treatment, and leachate disposal.
21 citations
01 Nov 1994
TL;DR: In this article, the authors evaluated the distribution of selected organic contaminants leaching from the Wilder's Grove landfill in North Carolina and evaluated the potential for anaerobic biodegradation of these contaminants.
Abstract: Sanitary landfills constructed without engineered liners release leachate into the subsurface, resulting in groundwater contamination. The project was undertaken to evaluate the distribution of selected organic contaminants leaching from the Wilder`s Grove landfill in Raleigh, NC, and to evaluate the potential for anaerobic biodegradation of these contaminants. Wilder`s Grove landfill is typical of sanitary landfills located in the Piedmont region of North Carolina and was constructed without an engineered liner or leachate control system. Results clearly show that anaerobic biotransformation processes have the potential to significantly reduce the migration of aklylbenzenes and chlorinated aliphatic hydrocarbons in the subsurface. Conventional monitoring techniques are not sufficiently sensitive to estimate anaerobic degradation rates in the field at a reasonable cost.
11 citations