•  Landfill Engineering
  •  Bioreactors
  •  Landfill Gas
  •  Planning
  •  Facilities
__________________

  Landfill Gas

Anaerobic decomposition of organic solid waste in the landfill environment produces landfill gas (LFG). LFG mainly consists of methane and carbon dioxide, both of which are odorless. Trace constituents of other volatiles, often malodorous or toxic gases, are also found in LFG.

LFG can migrate through soil into structures located on or near landfills. Since methane presents a fire or explosive threat, LFG must be controlled to protect property, and public health and safety. Also, many jurisdictions require landfill owners/operators to reduce reactive organic gas emissions to improve regional air quality. Thus, engineered solutions are needed to efficiently and safely monitor, collect, and process landfill gas.

A positive side to LFG control is energy recovery. Today's technology allows a landfill owner/operator to recover the energy in LFG while reducing gas emissions. Revenue from the sale of LFG or electricity generated using LFG as a fuel can offset costs for landfill environmental compliance and/or closure.

  SCS Engineers - Over A Third of a Century of Experience

Since 1970, SCS Engineers has been a national leader in the planning, permitting, investigation, design, construction, and operation of LFG control and energy recovery systems. Our LFG designs are working at hundreds of locations around the world.

SCS specializes in: (a) engineering design services and investigations; (b) system construction; and (c) long-term system operations, maintenance and monitoring.  SCS provides design/build services for construction of landfill gas systems. A design/build project typically combines the design and construction steps into a single contract, resulting in an expedited construction schedule and reduced overall costs.

RCRA Subtitle D

The Resource Conservation and Recovery Act (RCRA) establishes landfill design and performance standards under Subtitle D. Subtitle D requires monitoring of landfill gas, and establishes performance standards for combustible gas migration control. Landfill owners/operators must:

• Establish LFG monitoring programs. Use of gas monitoring probes is typical.
• Monitor for subsurface migration of combustible gas on a quarterly basis.
• Maintain combustible gas concentrations under 5 percent in soil at the property line, and under 1.25 percent in facility structures.
• Mitigate gas hazards if conditions are not in compliance.

SCS has designed and implemented the types of LFG programs required under Subtitle D at hundreds of landfills.

  New Source Performance Standards

The US EPA has proposed control of surface LFG emissions under the Clean Air Act. The New Source Performance Standards (NSPS) will require LFG testing and collection system installations at many sites, even those otherwise in compliance with RCRA Subtitle D. NSPS will require landfill owners/operators to:

• Estimate total LFG emissions using sophisticated gas models, laboratory analyses, and gas pump tests.
• Install comprehensive gas collection systems throughout the landfill at any site shown to have high emissions of non-methane organic compounds.
• Perform long-term operation and record keeping on such landfill gas systems.

SCS offers the services required for NSPS compliance including engineering test services, laboratory analysis, gas system design, system installation, and operations.

SCS offers comprehensive landfill gas services to assist you in meeting regulatory compliance and budgetary constraints.

  Combustible Gas Migration Control

• Gas Monitoring
• Control System Design
• Landfill Underground Fire Control
• Long-Term Monitoring and Certification
• Permits and Regulatory Support

  Energy Recovery

• Feasibility Studies
• Gas Modeling
• Field Test Programs
• Market Investigations
• System Design
• Gas Sale Contract Services
• Construction and Operation Services
• Long-Term Monitoring and Certification

  Odor Abatement

• Odor Assessments
• Odor Abatement Design
• Construction Services
• Start-Up and Well Field Balancing
• Long-Term Monitoring and Certification
• Permits and Regulatory Support

  Toxic Gases

• Gas Characterization
• Air Modeling
• Stack Testing
• Permits and Regulatory Support

  Design/Build

SCS Field Services can construct and operate your landfill gas collection system, and provide comprehensive closure and post-closure operation and maintenance services.