The BioMonitor® from LAR Process Analysers AG is
suitable for many different applications:
The patented measuring method of the BioMonitor®
works just like a miniature treatment plant. The activated sludge, either
supplied direct from the plant or circulating with the sludge recycling system,
degrades the substances present in the waste water. The oxygen required for this
process is measured. This process takes place in the waste water cascade of the
BioMonitor® which works exactly like an aeration tank.
Since the microorganisms which are contained in the activated
sludge do also breathe oxygen, the self-respiration has to be subtracted from
the total oxygen consumption for the exact BOD determination. This self
respiration is measured in the reference cascade of the BioMonitor®.
Finally, the BOD is calculated from the difference between the values measured
in both cascades.
Compared with Systems with just one reaction vessel the
degradation happens not only faster, but through the multi-step construction.
Additionally, hard degradable substances are determined in the rear waste water
The result for the user of this unique measuring principle is
the precise and fully continuous determination of the BOD in three to four
minutes. The sample gets degraded without any extra dilution exactly like in the
particular treatment plant.
The measurement of the self-respiration of the activated
sludge (ASR) serves not only the exact calculation of the BOD, but also the ASR
provides important information on the condition of the plant's own biomass which
is especially of importance for control and supervision. If the ASR, for
example, is falling slowly it could be an indication of a steady poisioning of
the activated sludge by toxic substances, which could easily be detected by the
The BioMonitor® is equipped with a good readable
display which depicts clear graphical surveys of measured values. In addition to
graphics, the actual measuring values can also be displayed in large digits.
The complete operation manual is integrated into the
self-explanatory software. Thereby the user may look up even infrequently
required information directly at the instrument at anytime. The
BioMonitor® resumes normal operation after a power loss and stores
all previous data in memory. This ensures optimum operation.
All graphics and results may be printed out through the
printer interface. An uncomplicated data-transfer to disk or directly through
serial or parallel interfaces to a measuring station is a matter of course, just
as the preparation for teleprocessing and remote control.
The BioMonitor® detects even rapid BOD changes and
shows accurate measuring results.
Accompanying illustration shows the BOD value after 5 days in
comparison to the values measured with the BioMonitor® at the
influent of a beverage company.
Noteworthy is the outstanding and most consistent correlation
(r > 0,95) to the standard methods (DIN 38409-H51, APHA-AWWA-WPCF 5210 B, EPA
- approval, etc. ).
The patented sample preparation system FlowSampler works filtration-free as the sample is taken
in the center of the sample stream against the direction of the main stream.
Thereby, all large particles are reliably removed. Smaller solid matter
particles are also sampled, ensuring that a representative sample reaches the
FlowSampler masters even the most difficult tasks, for
example; sampling at sewage work influents before the coarse screen.
|Type of measurement
||Continous measurement of BOD and sludge activity using
||user adjustable between 1 - 50 and 1 - 200,000 mg/
||every 3 - 4 minutes|
|Graphic-LCD-screen, high resolution, back-lit|
|Self-explanatory Software including maintenance checklists and
|Industry-standard data interface|
|Waste water, drain
||tube 30 mm ID or threaded 32 mm OD or as
||230 / 115 V ~, 50 / 60 Hz, 150 VA|
||0/4 - 20 mA (BOD)|
0/4 - 20 mA (sludge
||RS 232 for data transfer and remote
||steel IP 54|
||720 x 600 x 420 mm (H x W x D)|
28.4 x 23.6 x 16.5
inches (H x W x D)
||70 kg (154 lbs)|