Improved Fluid Distribution System for Bioreactor Landfills

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Landfills to treat solid waste are divided into two primary categories the \"dry tomb\"" and the bioreactor landfill. The key difference between these two types resides is the fact that bioreactor landfills require controlled addition of leachate or moisture to the solid waste in the landfill. These types of landfills are considered to be more environmentally friendly. The effective recirculation of a leachate and other liquids or fluids (such as steam or air) to the solid waste in the landfill is a major component in a bioreactor landfill. The injection of the leachate or moisture into the bioreactor landfill increases the rate of waste decomposition and thus makes the landfill more efficient and effective. Description: This invention utilizes a perforated pipe that is positioned adjacent a permeable layer which has hydraulic conductivity. The permeable layer is arranged on a portion of the solid waste in a bioreactor landfill. A leachate fluid is injected into the perforated pipe under positive pressure so that the fluid exiting the pipe is distributed to the solid waste adjacent to the permeable layer in a uniform manner. Various claims of this invention include methods for collecting and re-circulating waste treatment liquids and collecting and removing occurring gases from solid waste in the landfill. A system for injecting fluid into waste in landfill is also claimed as well as a method for determining physical characteristics of solid waste in landfill.IP Protection Status: US 7309189 (issued Dec 18 2007)US 2008/0131207 A1 (filed Oct 29 2007)"


Benefits: -Allows continued use of active landfill. Installation in actively used landfills is possible without interruption. Enables uniform distribution of fluid - Uniform distribution of the fluid into the underlying waste or contaminated area through the permeable layer. -Avoids Dry Zone Formation - Avoids development of dry zones that can lead to differential settlement of waste that can result in greater landfill cap maintenance costs. Allows for improved draining of liquids - Draining of injected and re-circulated fluids avoids potential flooding of the gas collection systems and possible system leakage from the landfill side slopes. -Enables varying degree of saturation - Saturation of the permeable layer is based upon the rate duration and frequency of liquid dosing cycle. This allows accelerated decomposition and increased settlement of waste resulting in an improved airspace gain. Increased collection of commercially valuable gasses - Allows for acceleration in the generation of landfill gas...

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