Landfill gas generation

Where there is a landfill gas-generation problem, active (i.e. pumped) or passive venting, by way of stone-filled trenches at least 3 feet deep, may be needed. Where active... 

Generation rates are only provided in descriptive terms as it is virtually impossible to assign typical values to the different sources, due to the number of variables involved. The generation rates in Table 3.1 are provided in order to allow a comparison of tire relative risks posed by the various sources. The main factors that affect landfill gas generation and lateral migration are discussed in more detail in Section 4.1. 

Figure 4.2 Landfill gas generation against time (Nastev, 1998)...

A more accurate estimation of landfill gas generation rates and the changes over time can be developed using the GasSim computer program developed by the Environment Agency (see Eigure 4.3). This uses a first-order kinetic model... 

The graph in Figure 4.3 shows how the total landfill gas generation rate computed from GasSim varies over time. In this example tipping was undertaken... 

Figure 4.3 Estimation of landfill gas generation rates with GasSim...

In landfill gas generated from landfill sites there are several hundred trace volatile hydrocarbon gases that can be present, for example volatile organic compounds (VOCs). Their total presence is typically about 1% of the total volume of landfill gas. There are many household chemical products that will... 

Nastev M. R. (1998) Modelling landfill gas generation and migration in sanitary landfills and geological formations. Ph.D. dissertation, Laval University, Quebec, Canada. 

De Gioanni, G, Muntoni, A., Cappai, G, MiUa, S. 2009. Landfill gas generation after mechanical biological treatment of municipal solid waste. Estimation of gas generation rate constants. Waste Manage. 29(3) 1026-1034. 

---