Case Study WWTP application-stripping0 pages
Case Study N°AA4 – Ambient air monitoring – WWP TRS MEDOR Stripping – updated: 14.10.15
Case Study
Ambient Air Monitoring Applications
Waste water treatment plants
Screening area: stripping
Context & Challenges
Globally, the wastewater treatment is the first public health issue. Urban development leads to urbanization
near waste water treatment plant and extension of sewerage network. These aspects induce to an
augmentation of sulfur compounds (H2S, mercaptans and sulfides) which are very corrosive, odorant and
toxic. To monitor this compounds online CHROMATOTEC® offers high meteorological solutions.
To ensure the safety of operatives in the screening building/area of waste water treatment works an H2S analyzer
has been installed in the main building to complement the protection provided by individual monitors.
Chromatographic measurements show that other sulfurous compounds including Methylmercaptans are present in
the air in addition to H2S.
Five outlets in the building are located near six rough screens dedicated to primary treatment. The presence of
sulfur compounds can vary from screen to screen and from one day to the next depending upon the quality of the
incoming waters. Measurements need to be taken as close to the incoming water as possible. Results for each
area are visually presented near the entry/exist
Chromatotec® Solutions
TRS MEDOR ppb or ppm for up to 14 compounds
With only one instrument, it is possible to analyse up to 14 sulfur compounds. Thanks to
specific sulfur detector (SSD) and AIR or N2 carrier gas, the separation and sensitivity is
excellent down to 1 ppb levels and low odor unit/m 3.
The instruments are being calibrated with primary gas standard certified at ±2%. There are
no interferences due to the gas chromatography separation and the sulfur specific
detector. The analyzer is LINEAR: range 0 / 100 ppb.
The instruments are fully automated thanks to internal calibration (airmoCAL). The VISTACHROM software
controls the analyzers, multiplexer, meteorological station and enables storage and display of the chromatograms
thanks to Peak Viewer.
It is possible to transfer data to a data logger or modelling software with the communication protocols MODBUS
RTU, JBUS, German PROTOCOL and X-Path.
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