Ideas for a clean environment
Creation of the detailed design for constructing a groundwater purification system based on a basic design. Delivery and assembly of a groundwater purification plant including a treatment hall, compliance with the requirements of the WHG (Water management law) and installation of a system for the pumping and seepage of purified water.
The groundwater, which is chiefly contaminated with BTEX, typical pharmaceutical substances and H2S, is pumped into the groundwater purification plant from four wells with a flow rate of 75 - 80 m³/h. The water is then cleaned by desorption with downstream catalytic oxidation, a biologically effective dry sand filter and activated carbon. The purified water is then fed back into the aquifer through 60 infiltration wells. H2O2 is added to the infiltration water, causing unwanted iron and H2S to remain in the subsoil.
Along with the hydrogen peroxide, nitrate is also added, so that the microbiology in the ground has a favourable aerobic environment in the subsoil and in-situ bioremediation can take place. This measure is supported by additional soil air decontamination.
The groundwater remediation facility started operation in January/February 2005. A soil air extraction plant has been running since 1997. Up to now (as December 2008) 74,000 kg of contaminants have been eliminated by the groundwater remediation facility and approx. 59,000 kg of contaminants have been eliminated by the soil air extraction plant. The proportion of in-situ contaminant eradication was approx. 78%