ON LINE TOXICITY MONITOR

JanCzek janczek at aol.com
Tue Oct 29 16:56:25 EST 1996


ON-LINE BOD/TOXICITY MONITOR

Columbus Instruments' new On-Line Respirometer utilizes a patented
principle of
measuring oxygen consumption in gaseous stage in the head space of the bio
reactor instead of immersed DO (dissolved oxygen) probes utilized in most
other
designs.  Although the advantages of measuring head space gas exchanges
are
numerous, the most important advantage is the separation of the oxygen
sensor
from the aggressive media of sludge or wastewater and, therefore, avoiding
the
sensor's damage or contamination.  Another important advantage is that
besides
measuring oxygen consumption, there is the possibility of measuring
additional
gases evolved from the wastewater or sludge such as CO2 and H2S.  The
principle
of Columbus Instruments' Respirometer is based on measuring the
respiration of
bacteria culture in the form of the fixed film attached to ceramic
granules.
This bacterial culture is alternatively exposed to clean water to measure
background respiration and wastewater to measure the increase of oxygen
consumption due to available nutrients.  The difference in respiration is
presented as value contributed to the available organic nutrients in the
wastewater (BOD).  Columbus Instruments' Respirometer can also be
programmed to
periodically measure oxygen consumption of the bioreactor exposed to the
standard solution of glucose or glutamic acid for testing biotoxicity. 
The wide
measuring range from 0.1 to 200,000 mg O2 per liter far exceeds
sensitivity and
range of any similar product.  It allows the measurement of BOD of water
from
relatively clean river or stream as well as active sludge.  Reactor size
is 3
liters but can easily be changed to 4 or 10 liters.  On-Line Respirometer
is
controlled by its own microprocessor and provides results on numerical
display.
Historical data for measurements from the previous 30 days is also stored
and
can be recalled on demand.  Data can be transferred to a remote computer
1,000m
away via RS-485 link.  

To receive more information, please e-mail you street address to Columbus
Instruments:  75144.2413 at compuserve.com





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