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Revolutionary Range of PeCOD™ COD
Analysers Launched
Aqua Diagnostic (Australia) have invented a
revolutionary green technology COD (Chemical Oxygen Demand)
analyser capable of real-time accurate and sensitive (sub-ppm)
COD analysis. The PeCOD™ technology represents a major
step forward in COD analysis, on multiple levels.
GREEN; no hazardous or toxic
chemicals are required, only an electrolyte solution, unlike
the standard dichromate method.
FAST; analysis times can be determined in
minutes not hours, thus providing the economic benefit of
real-time process control and environmental monitoring.
VERSATILE; a broad spectrum of matrix streams
including seawater can be easily analysed.
SENSITIVE analysis to sub- ppm levels.
ACCURATE analysis of a wide range of organic
species including many traditionally ‘recalcitrant’
species such as primary alcohols and carboxy acids which are
frequently underestimated by traditional COD analysis techniques.
BOD can be directly correlated
to the PeCOD™ COD results. PeCOD™ COD analysers
are available in three different models purpose designed for
Laboratory use, Field Portable analysis,
and Online COD monitoring. All systems incorporate
the same core COD analysis module to ensure identical performance
between models. The simplicity and speed of the technique
is what allows it to be fully automated in a self-contained
online system. The system
comes pre-configured in a single weatherproof stainless steel
enclosure that houses the sampling, analysis, and telemetry
modules, as well as electrolyte solution reservoirs. It can
be configured to monitor multiple sample streams.
This has some significant benefits to any industry involved
in WASTEWATER TREATMENT, or using COOLANT
WATER or WATER FEEDSTOCK to a manufacturing
process.
In wastewater treatment plants the secondary
influent can be monitored in real-time, providing the plant
with early warning of any changes in COD, and through PLC
control increase aeration to deal with this. This saves on
energy (most plants run at higher aeration levels than they
need ‘just in case’) and avoids costly process
excursions.
In BNR plants (biological nutrient removal)
methanol or acetic acid is used as a food source for the biological
process. Measuring the COD of the influent allows more accurate
dosing of the food source, increases the efficiency of the
process and reduces expensive over-dosing. Because the PeCOD™
technique is both fast and accurate, it can be used to do
an immediate COD measurement on waste that is brought in by
road tankers. This ensures that the client is being charged
appropriately, as well as avoiding treatment plant issues
from unexpected high COD loads.
For industries using seawater in cooling towers,
the PeCOD™ technique is the first to be able to directly
and accurately monitor the coolant stream despite the high
chloride concentration up to 35,000 mg/L. Outflow can be monitored
to ensure compliance with environmental requirements, and
also warn of product loss into the coolant stream (e.g. sugar
refineries).
The PeCOD™ technology is based on a patented
photoelectrochemical process. The core of the technology is
the ability of the UV activated TiO2 (titanium dioxide) nano-particulate
photocatalyst to create a high oxidation potential. This ensures
complete oxidation of all oxidisable organic species. The
direct capture and measurement of the resultant photocurrent
means that a direct measurement of the oxidation is being
made.
To get more information on the PeCOD contact
Vanessa Bunn at Anatech Instruments on 011 462 6776 or email
sales@anatech.co.za
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