PB2
Calibration unit In situ Process Control
In situ systems are often design following rules of thumb. To break with this habit Geo & Hydro developed a parallel
processing unit based on multiple PC's to follow intrinsic bioremediation
processes using in situ sensors. As
the system allows process tracking on a real-time basis it is ideally suited for
calibration active in situ installations. These
can stimulate the remediation processes intensively or extensively such as the
IHRIS type systems of Geo & Hydro.
parameters then can be logged simultaneously are:
Air movements (3D) in the unsaturated zone (down to 1 mm/hr);
Concentration of gasses (O2, CO2, N2O, CH4, H2S and HC vapours);
In the data processing unit these two were combined as flux of the individual
gasses;
The sensor data is compared to
results of analysis of gasses and water (both taken automatically every 15
minutes) using on-line analytical
instruments (GC-TCD, UV-Vis)
The system also records depth to groundwater at several positions, the groundwater
flow direction (2D) using the G&H groundwater vector-sensor and variations
in depth, NO3 concentration in capillary fringe to measure diffusive upwards
movement, Meteorological
conditions: wind speed and direction, sunshine intensity, air temperature and
humidity, rainfall and evapotranspiration.
