ToxSys_norm
- sensitive biomass for river monitoring / water intake
protection
List
of Articles : Toxicity Monitoring
ToxSys_adapt
(W)
ToxSys_adapt
(W) is a toxicity analyser with immobilized turbulent- bed biology.
As in the BIOX-1010, the microbes grow on the inner surface
of small hollow cylinders. Like the activated sludge of a treatment
plant, the microbial population in the bioreactor is adapted
to the conditions of the wastewater. So long as the wastewater
is not toxic to the adapted biology, the organisms in the bioreactor
take up dissolved oxygen. A toxic impact inhibits the
respiration of the organisms, causing an increase in the dissolved
oxygen level. If the respiration rate decreases by more
than about 20%, an additional dilution of the wastewater is
triggered, and is regulated such that the overall depression
of microbial activity does not exceed 20%. This protects the
microbes and provides the mechanism for toxicity measurement.
The mixing ratio of wastewater and dilution water, together
with the oxygen difference, are used to calculate the toxicity
reading.
Features
True
continuous measurement
Response
time: 3 to 15 minutes
Measurement
range: 0 - 100% toxicity
Turbulent-bed
bioreactor
Sample
preparation with self-cleaning coarse filter
Automatic
calibration
Programmable
concentration alarms
Charts
and instantaneous toxicity level displayed on LCD graphic
display
Up
to 14 days historical data can be recalled and displayed
graphically
ToxSys_adapt(W)
is configured for protecting treatment plant biology from
toxic influent. Detector biology is immobilised in hollow
cylinders. Changes in the sludge conditions in the aeration
basin do not affect the toxicity measurement.
ToxSys_adapt
(B)
ToxSys_adapt
(B) is a continuous on-line toxicity analyser. The bioreactor
is populated with microorganisms from the wastewater treatment
process. For the analysis, wastewater is continuously mixed
with activated sludge and dilution water. So long as the
wastewater is not toxic to the adapted biology, the organisms
in the bioreactor take up dissolved oxygen. A toxic impact
inhibits the respiration of the organisms, causing an increase
in the dissolved oxygen level. Increasing oxygen level
is the measure for toxicity. For monitoring and control, ToxSys_adapt
(B) is equipped with signal outputs of 0-20 or 4-20 mA.
A built-in graphical display shows concentration data and other
important information, which are stored for the last 14 days.
A diskette drive provides long-term data storage. For
measuring toxicity in simulated tank conditions, the waste-water/activated
sludge mixture is pumped directly from the aeration basin to
the bioreactor. The oxygen level in the bioreactor is then proportional
to that in the aeration basin.
Features
True
continuous measurement
Response
time: 3 to 15 minutes
Measurement
range: 0 - 100% toxicity
Turbulent-bed
bioreactor
Sample
preparation with self-cleaning coarse filter
Automatic
calibration
Programmable
concentration alarms
Charts
and instantaneous toxicity level displayed on LCD graphic
display
Up
to 14 days historical data can be recalled and displayed
graphically
ToxSys_adapt
(B) is designed for use with stable activated sludge and
can handle frequent toxic slugs.
ToxSys_norm
ToxSys_norm
is a toxicity analyser with immobilized normalised biology.
The normalised microorganisms are cultured by addition of a
nutrient solution and grow as with the BIOX-1010 on the inner
surface of small hollow cylinders. The regulation is the same
as in ToxSys_adapt(W).
The mixing ratio of wastewater and dilution water, together
withthe oxygen difference, are used to calculate the toxicity
reading. To specifically protect the nitrification process
in a treatment plant, ToxSys_norm
can be set up with nitrification dominated detector biology.
No dilution water is needed if there is sufficient oxygen content
in the water being monitored.
Features
True
continuous measurement
Response
time: 3 to 15 minutes
Measurement
range: 0 - 100% toxicity
Normalized
biology adjusted to nutrient solution
Sample
preparation with self-cleaning coarse filter
Automatic
calibration
Programmable
concentration alarms
Charts
and instantaneous toxicity level displayed on LCD graphic
display
Up
to 14 days historical data can be recalled and displayed
graphically
ToxSys_norm
uses high sensitivity normalised biology which is immobilized
in hollow cylinders. These microbes can be directly affected
by the nutrient composition, enabling direct protection
of processes such as nitrification.
