The history behind Doranova’s landfill gas emission measurements and action statements reach back to 20 years to a time when the company Detes Scandinavia Oy began providing measurement services. Since the beginning of the operation, these measurement results have been utilized by several landfills and waste management companies in delivering their statutory emission reports. In the year 2012, the company name was changed to Detes Nordic Oy when Doranova Oy joined in the company. At the end of 2017, Doranova obtained a majority shareholding after which the operations have been continued led by Doranova.
FID measurements are performed yearly from April until the end of October depending on weather conditions. Usually, approximately 25 measuring days accumulate during this period. In addition to FID measurements, we conduct action statements for gas collection systems throughout the year.
Usually, a closed landfill is covered with a gas-impermeable membrane and several different covering (soil) layers. The condition of this entity is evaluated with emission measurements and subsequently, possible leakages in the landfill structures can be located. We have conducted more demanding measurements and action statements for years with our German partner, whose staff has measuring experience from over 1 000 different landfills. The operation is based on the extremely accurate FID-measuring (flame ionization detector) tool which operates at the reliable ppm-level accuracy. thousands of measuring points are accumulated and from those, in addition to measurement data, the customer is provided with a representative graphic emission map with the corresponding coloring.
With the landfill gas collection system condition assessments, we investigate the actual condition of the gas collection wells and the capacity utilization ratio of the collection lines. With measurements and adjusting procedures, we can improve the quality and quantity of the gas originated from the landfill. On average, with the help of an action statement, a 10–15% improvement in gas methane concentration can be obtained while simultaneously the percentage of oxygen in the total gas is adjusted to a safe level. With these improvements, the burden placed on the gas-operated turbine and piston engines can be reduced. Additionally, the report based on the action statement gives clear draft-measures for the further developments for the gas collection system.