Rapidly and safely degrade CVOC's in to chloride and ethene
Bioaugmentation is a process where contaminants are degraded by adding specific degrading bacteria to the contaminated soils to enhance biodegradation. This process is called bioaugmentation. Multidechlorobac (MDB) is a bacterial culture for the degradation of chlorinated volatile organic compounds (CVOC). Our specialized microbial team anaerobically degrades the contaminants to harmless chloride and ethene in the presence of a carbon source without accumulation of toxic intermediates.
Chlorinated volatile organic compounds (CVOC) belong to the most abundant groundwater pollutants. Due to leaks and spills in the past, these compounds are found at a significant number of sites of the dry cleaning, metal and chemical industry. As a result of the chemical and physical properties of CVOC, traditional remediation techniques like pump and treat, often do not offer a cost efficient solution for the removal of these pollutants. In contrast, in situ biodegradation provides a sustainable remediation technique for groundwater and soil contaminated with CVOC. Hereby, the pollutants are degraded by bacteria, growing on these contaminants. If the site itself does not have the appropriate bacterial strains for the degradation, the addition of safe and specialized bacteria to the soil can be applied. This process is called bioaugmentation.
Avecom developed a robust microbial culture Multidechlorobac for the sustainable remediation of soil and groundwater polluted with CVOC. The culture contains a team of anaerobic bacterial strains capable of the complete dechlorination of chloroethenes and chloroethanes in a reasonable timespan.
- In situ degradation of CVOC into harmless products without the accumulation of toxic intermediates
- Safe handling and application (no agressive chemicals) not interfering with normal industrial practices
- Widely applicable: broad pH range, high salt intolerance, different soil types
- Cost saving technology: no excavation or pump and treat (in situ degradation), no transport of contaminated soil, low energy demand
- Proven and sustainable technology
- In situ bioremediation (injection filters, direct push,...)
- Ex situ bioremediation (bioreactor)
Removal of chlorinated volatile organic compounds
Multidechlorobac is a diverse and robust dechlorinating culture. It consists of both dechlorinating bacteria and supporting fermenting micro-organisms.
Multidechlorobac is a bacterial consortium able to degrade 1,2-dichloroethane (1,2-DCA or EDC), 1,1,2-trichloroethane (1,1,2-TCA), perchloroethene (PCE), trichloroethene (TCE), cis-dichloroethene (cis-DCE) and vinyl chloride (VC) in groundwater. The culture contains a team of cooperating specialized bacteria. This team degrades the pollutants anaerobically by means of a reductive process to the harmless chloride ion and ethene, without toxic intermediates. The use of dechlorinating bacteria is advised to enhance biologic degradation of the pollutants especially when biostimulation results in insufficient degradation or in accumulation of toxic intermediates.
The activity of the Multidechlorobac was scientifically sound demonstrated in the lab as well as in the field: a pilot test in the field showed a degradation of 300 000 µg 1,2-DCA/L in 54 days.
Succesful research and development resulted in a new innovative soil remediation technique, proven on pilot scale on a site of the Tessenderlo Group, Belgium. This project has been realized through a cooperation between Avecom, the Laboratory of Microbial Ecology and Technology (LabMET) of the University of Ghent, the Unit Groundwater modeling of the University of Ghent, RSK and Tessenderlo Chemie. The innovative technique relies on the one hand on the dechlorinating culture and on the other hand on the HydroGeoBiocell technology. This HydroGeoBiocell aims the formation of a zone in the subsoil with bacterial degradation of the contamination and the cell is created by a profoundly elaborated and optimized configuration of wells and pumping scheme. By this concept, a sufficiently high groundwater recirculation is realized which is of utmost importance on sites with a slow groundwater flow.
Due to the innovative character, the project has been recognized and financially supported via the European Commission of the Life+ program.