Page 351 - Materials Chemistry, Second Edition

CAT3525_C10.qxd 1/31/2005 12:00 PM Page 322
322 Waste Management Practices: Municipal, Hazardous, and Industrial
Valve box
and cover

Compacted
1" PVC soil or
monitoring refuse
port with cap
Valve
Depth varies with site characteristics

6"
6" PVC lateral

Bentonite or
concrete
Gas collection
header
4" PVC pipe

1" +
crushed stone

4" PVC
perforated pipe

Cap
(a)
24" diameter

Stack

Flame
Valve
Control panel
Air Spark arrestor
inlet
Waste gas Propane
Blower inlet valve
Concrete base Concrete base

Gas from
(b) landfill

FIGURE 10.17 A flaring system for landfill gas: (a) schematic of extraction system (U.S. EPA, 1994); (b)
surface features (Reproduced with kind permission of MACTEC Engineering and Consulting, Inc., formerly
known as ABB Environmental Services); (c) photo.