Sewer systems operators require a Factor of Safety of 10, on the allowable maximum disolved methane concentration discharged to sewer due to unknown factors, which may contribute to the presence of methane in sewers.
For example, some sewers already contain methane gas, and any contribution from the discharge of leachate should not be allowed to appreciably worsen existing methane risks.
Only the use of a tried and tested scientifically based process design will ensure the discharge consent limit will be achieved, or better removal achieved, under all operating conditions.
In a number of instances, methane stripping systems used in the process industries have been marketed as standard ‘packages’ for use with leachates, but many have not performed adequately or reliably.
IPPTS Associates recommend that a bespoke design, tailored to each site, is essential for each installation, for reliability and economy, and efficient operation. This is due to the wide variability found in leachate contaminants from site to site.