Reducing Long Term Impact
Landfill Gas (LFG) contains methane which is a potent greenhouse gas. The amount of gas produced along with other emissions produced on site does put the MRC over the National Greenhouse Emissions Report (NGER) limits. To minimise this risk, the MRC has taken the following steps to minimise uncaptured fugitive LFG emissions and to maximise the use of methane gas for generating power.
- The EDL operates a Landfill Gas treatment facility within the Tamala Park precinct. This combusts collected Landfill Gas to produce electrical power which is exported to the electrical grid.
- LFG recovery is maximised by sinking extraction wells throughout the landfill, and applying a negative pressure through a network of pipes that deliver the Landfill Gas to the EDL treatment plant. EDL uses sacrificial wells on temporarily inactive landfill areas to maximise gas extraction and since 2008 has undertaken horizontal removal of LFG to allow active filling to continue above active LFG extraction wells.
- The MRC will consider opportunities for ongoing development of improved gas capture options including capping, gas field mapping and extraction, bio-filters and rapid waste degradation options.
- Fourtnightly monitoring of each LFG extraction well valve are undertaken by the EDL. This includes composition monitoring of methane, oxygen and carbon monoxide as well as temperature monitoring of LFGs. Based on these monitoring results, EDL may be required to undertake wellfield adjustments in accordance with the LGP Company’s Well Field Adjustment Guidelines.
- The EDL has developed remote monitoring and control software system what allows access to start, stop, monitor and adjust both wellfield and engine operations. This provides continuous observation and control over the site, even when staff are not in attendance.