04469176 is referenced by 87 patents and cites 7 patents.

In a landfill gas recovery system, the breakthrough danger is minimized, and the system efficiency is improved, by providing pressure-equalizing low-impedance gas paths such as aggregate-filled symmetry trenches positioned within the landfill and surrounding, at least partially, the primary collection zone. The symmetry trenches may be connected to the system's low-pressure source to serve as secondary collectors. A sensing trench positioned within the landfill along the periphery of the collector's zone of influence can be used to monitor the collector pressure and to automatically maintain it at a safe level. The sensing trench can also serve as a secondary equalizing path in heterogeneous landfills. Hot spots may advantageously be tapped by auxiliary collectors whose pressure level bears a predetermined proportional relationship to the primary collector pressure.

Title
Landfill gas recovery system and method with pressure symmetry
Application Number
6/502093
Publication Number
4469176
Application Date
June 8, 1983
Publication Date
September 4, 1984
Inventor
Alex Roqueta
Redondo Beach
CA, US
Stanley W Zison
Irvine
CA, US
Agent
Gordon L Peterson
Assignee
Getty Synthetic Fuels
CA, US
IPC
E21B 43/12
E21B 43/02
View Original Source