After consultation with WAVIN and the Province of Overijssel, Orvion drew up a plan for biological remediation and Mourik Groot-Ammers was approached to carry out remediation under supervision of Orvion.
By assembling a project team consisting of Wavin, Orvion, Dion and Mourik Groot Ammers, theoretical and technical knowledge has been combined, which has resulted in a practical execution with an eye for people, nature and environment.
A clean-up plan has been submitted to the province of Overijssel that forms the basis for the subsidy granted in 2007 in accordance with the business rules.
The biological remediation started in October 2017. In the areas with the most pollution, bacteria of the species Dehalococcoides are injected into the soil with nutrients (see photo). In addition, groundwater was extracted from December 2017 to October 2018 and returned to the soil after adding bacteria and nutrients. In this way the degradation of contaminants has been initiated on a large scale.
We can now determine the effects of biological remediation. Orvion monitors the development of the bacterial population in the soil with accurate DNA techniques. At the spot where most of the contamination is present, more than 8 billion bacteria of the species Dehalococcoides per liter of groundwater are now being measured. The graph below shows how these bacteria convert PER and TRI into the harmless ethylene.
Due to the biological remediation, the extent of the pollution has decreased and degradation has started. This means that we can now stop the active circulation of groundwater and let nature do the work.
Only renewable, natural raw materials such as lactic acid and acetic acid are used in biological technology and energy consumption is low. That is why biological remediation is not only very effective, but also very sustainable.
Quote Rene Cazemier of Wavin: “ We let the animals do the dirty work now. That is a clean technique that fits this time and our situation. We could not continue with the water purification forever. We want to get rid of the pollution and now the end is in sight ”
For more information about clean and affordable biological remediation please contact Marc van Bemmel .
Marc van Bemmel is an Environmental Technologist. He established Orvion in order to develop and apply sustainable biological techniques. He has a great fascination with nature and likes to demonstrate how powerful it can be, how we can learn from it and how we can use natural processes in a meaningful and harmonious way.