A control system for controlling extraction of landfill gas from a landfill via a gas extraction system, the gas extraction system comprising well piping for coupling a plurality of wells to a gas output. The control system comprises a controller configured to: obtain a value indicating measured energy content of landfill gas collected at the gas output from the plurality of wells; determine whether the measured energy content is different from a target energy content; and in response to determining that the measured energy content is different from the target energy content: control a plurality of valves disposed in the well piping to change flow rates of landfill gas being extracted from at least some of the plurality of wells at least in part by changing degrees to which the plurality of valves are open.

Described herein are embodiments of a control system that automatically (1) determines whether a gas extraction system is in a state in which landfill gas is being released into the atmosphere, and (2) automatically controls landfill gas flow to mitigate, prevent and/or stop the release of landfill gas. The control system may control a valve to control flow of landfill gas through well piping of the gas extraction system. The pressure of landfill gas in the well piping at a location upstream of the valve may indicate whether there is a risk of landfill gas being released into the atmosphere. The control system may adjust a position of the valve in response to determining that the pressure at the location upstream of the valve indicates that there is a risk of landfill gas being released into the atmosphere.

A method for use by a system coupled to at least one sensor and at least one flow control mechanism of a gas extraction system, the system comprising at least one controller and configured for use in connection with a landfill gas extraction process for extraction of landfill gas from a landfill via the gas extraction system, the method comprising: using the at least one controller to perform: obtaining, based on at least one measurement made by the at least one sensor, at least one current value indicative of a selected characteristic of the landfill gas extraction process, determining, at discrete time intervals, whether the at least one current value satisfies at least one compliance criterion for the selected characteristic, and when it is determined that the at least one current value does not satisfy the at least one compliance criterion for the selected characteristic, performing a corrective action.

A low-profile fluid collection conduit includes an elongate outer cover having an upper portion and a lower portion generally opposite the upper portion, with the outer cover being much wider than it is tall and defining an interior volume. An elongate rigid spacer is fitted within the interior volume of the elongate outer cover, with the elongate spacer allowing the majority of the interior volume to be unfilled so as to permit the flow of fluid along and within the elongate outer cover. The collection conduit is used with a fluid-impermeable membrane as part of a landfill fluid collection and conveyance system.

The disclosure provides a soil-groundwater joint remediation device and a method. The soil-groundwater joint remediation device is disposed in an area to be remediated and includes an injection structure, an extraction structure, and a control structure. The injection structure is disposed in an injection well defined in the area to be remediated. The injection structure includes a hot air injection member, an oxidant injection member, and a micro-bubble injection member. The extraction structure is disposed in an injection well defined in the area to be remediated and spaced from the injection structure. The extraction structure includes a liquid phase extraction member and a gas phase extraction member. The control structure controls the liquid phase extraction member and the gas phase extraction member to perform an extraction operation.

A system for treating a contaminated soil. The system includes a soil receptacle, a first conveyance mechanism in communication with the soil receptacle, and a second conveyance mechanism in communication with the first conveyance mechanism. The second conveyor is placed lower relative to the first conveyor so that the contaminated soil drops in elevation as it passes from the first conveyor to the second conveyor. One or more pretreatment sprayers are positioned substantially at a junction between the first conveyor and the second conveyor and that spray the contaminated soil as it moves from the first conveyor to the second conveyor. One or more sprayers are also positioned on the second conveyor such that they can spray the contaminated soil as it passes. An aerator is located at a depositing end of the second conveyor, by which the contaminated soil is further aerated as it drops of the depositing end of the second conveyor and contacts the aerator. One or more optional final sprayers can be positioned on the second conveyor such that they are able to spray the contaminated soil as it drops off the depositing end and contacts the aerator.

Described herein are embodiments of a control system that automatically (1) determines whether a gas extraction system is in a state in which landfill gas is being released into the atmosphere, and (2) automatically controls landfill gas flow to mitigate, prevent and/or stop the release of landfill gas. The control system may control a valve to control flow of landfill gas through well piping of the gas extraction system. The pressure of landfill gas in the well piping at a location upstream of the valve may indicate whether there is a risk of landfill gas being released into the atmosphere. The control system may adjust a position of the valve in response to determining that the pressure at the location upstream of the valve indicates that there is a risk of landfill gas being released into the atmosphere.

A rock sample includes multiple rock samples that are each obtained from the borehole. The rock samples have been exposed to contamination during a drilling operation to drill the borehole. The rock sample is split into a first sample portion and a second sample portion. The first sample portion is decontaminated with a solvent. The second sample portion is decontaminated by thermovaporization for an initial duration of time at an initial thermovaporization temperature below that of a cracking temperature of an organic matter carried within the rock sample. A difference between a first pyrolysis Tmax value of the first sample portion decontaminated by the solvent and a second pyrolysis Tmax value of the second sample portion decontaminated by the thermovaporization is determined to satisfy a decontamination level threshold. The remainder of rock samples are decontaminated by the thermovaporization in response to determining that the difference satisfies the decontamination level threshold.

Described herein are embodiments of a control system that automatically (1) determines whether a gas extraction system is in a state in which landfill gas is being released into the atmosphere, and (2) automatically controls landfill gas flow to mitigate, prevent and/or stop the release of landfill gas. The control system may control a valve to control flow of landfill gas through well piping of the gas extraction system. The pressure of landfill gas in the well piping at a location upstream of the valve may indicate whether there is a risk of landfill gas being released into the atmosphere. The control system may adjust a position of the valve in response to determining that the pressure at the location upstream of the valve indicates that there is a risk of landfill gas being released into the atmosphere.

A control system for controlling extraction of landfill gas from a landfill via a gas extraction system, the gas extraction system comprising well piping for coupling a plurality of wells to a gas output. The control system comprises a controller configured to: obtain a value indicating measured energy content of landfill gas collected at the gas output from the plurality of wells; determine whether the measured energy content is different from a target energy content; and in response to determining that the measured energy content is different from the target energy content: control a plurality of valves disposed in the well piping to change flow rates of landfill gas being extracted from at least some of the plurality of wells at least in part by changing degrees to which the plurality of valves are open.