All about LANDFILL GAS
Landfill Gas Formation
Landfill gas is formed during anaerobic decomposition of organic substances in solid household waste (SHW) and industrial waste. Depending on the type and composition of debris, seals in the body of the landfill, humidity and a number of other factors, thousands of polygons around the world are available for the collection and use of this valuable renewable energy source for power generation. The landfill gas enters the atmosphere, and the methane contained in it is a powerful greenhouse gas, and 21 times more harmful than carbon dioxide. Therefore, preventing the release of landfill gas from the landfill and using the latter as a renewable fuel is a win-win situation for business development.
Landfill Gas collection
To prevent the release of greenhouse gases into the atmosphere, while avoiding unpleasant odours and fires, landfill gas must be continuously extracted in a controlled manner. Perforated pipes are laid in the body of a rubbish dump and are interconnected by a pipeline system with access to general ridges. Using a vacuum compressor, gas is sucked from the body of the landfill, and a technically competently designed and constructed landfill gas collection system will fully gain landfill gas from various locations in the landfill, thus ensuring a stable quality of landfill gas.
Composition of Landfill Gas
The composition of landfill gas and its speed of reproduction are primarily affected by waste. SHW contain from 100 to 300 kg of organic carbon per ton. Microorganisms, without much difficulty, convert organic carbon to landfill gas through the processes of anaerobic digestion. The formation of gas is influenced by factors such as the composition of waste, the height and density of storage of waste at the landfill, air temperature and precipitation. The extraction of landfill gas begins several years after the waste has lain on the landfill, and lasts from 8 to 30 years. The constantly decreasing volume of landfill gas can be compensated by adding organic waste to the landfill. With a calorific value of 3.5 to 5.5 kWh in Nm3 (35-55% methane), landfill gas is an excellent fuel for gas engines that can be efficiently used for power generation. A typical example of landfill gas can be observed in the table below:
Component of landfill gas
Composition of landfill gas
Carbon dioxide (CO2)
The concept of GE Jenbacher gas engines for Landfill Gas
The wide range of GE Jenbacher gas engines is specifically designed to work at full load with high efficiency, despite the low calorific value and dynamic variations in gas quality and pressure. High-quality and specially designed engine parts resist aggressive impurities that usually appear in this type of fuel. Heavy contaminants, such as silicon, sulphur, siloxanes, should be removed if they exceed a certain level. The above measures will reduce the costs associated with the operation and maintenance of gas engines. As a rule, solid waste landfills are located near populated areas and emission standards are becoming increasingly stringent. To meet these standards, the entire system must be monitored and controlled, from fuel gas status up to exhaust gas analysis and emissions.
Advantages of GE Jenbacher gas engines for landfill projects
- Stable operation, despite the low calorific value of gas, fluctuations in composition and gas pressure.
- Electrical efficiency up to 42%.
- Compact installations in container design are easy to move and adapt to any changes in design decisions.
- Complex exhaust gas control solutions comply with environmental standards.
- Alternative utilization of landfill gas with its simultaneous use as an energy source.
- Revenues from the production of electricity and heat when filed in the public network.
- Loans or special tariffs for renewable energy sources "Green" tariff.
On the territory of Ukraine, there are 18 GE Jenbacher gas engines installed to incinerate landfill gas. Globally, GE Jenbacher gas engines are used in more than 1,700+ landfill projects around the world. The companies KTS Engineering together with GE Jenbacher offer to their clients the use of accumulated experience, recommendations and ready-made solutions tested by time. GE's special commitment (www.ge.com/ecomagination ) is to use and develop new technologies to help customers around the world cope with growing environmental challenges and reduce the impact on the environment.
Please contact KTS Engineering specialists and discuss your requirements.