Page 73 - Application Handbook - TOC

Sum parameter – Total Organic Carbon

TOC process analysis in the paper
industry
SCA-130-602

Paper manufacturing requires the use of
water for various processes (suspension and
transport of the pulp, cooling water, sieve and
felt cleaning, system cleaning). Although the
water circulation in paper mills has been
systematically optimized in recent years due
to water conservation, the paper industry still
requires large quantities of fresh water for the
production of paper. Wherever fresh water is
consumed, large amounts of wastewater are
also produced and these must be
continuously monitored. The wastewater from
paper and pulp mills is usually highly polluted
with organic carbon compounds. The many ■ TOC-4200
different products with various coatings, for The TOC-4200 is a high-performance
instance specialty papers, produce analyzer with catalytic combustion at 680 °C.
wastewater of widely varying compositions Depending on the sample characteristics,
and concentrations. three TOC analysis methods can be selected
(differential method, addition method, direct
method). The automatic dilution function
enables TOC analyses up to 20,000 mg/L. In
addition, the TOC-4200 can be extended with
a module for measuring the total bound
nitrogen (TN).

An automatic dilution function and the self-
calibration option allow a virtually
independent operation of the measuring
system. The measuring instruments can be
started and calibrated from one measuring
station and a selection between the different
Fig.Example of four different sample streams in the measuring streams is possible. Numerous
paper industry alarm and status signals simplify detection of

exceeded limit levels and indicate the need
The online analysis of these types of for maintenance.
wastewater is a major challenge for the In addition to the conventional communication
analyzer and for the sample preparation
modes, a Modbus communication channel is
available. An optional web browser enables a
‘view’ of the instrument from any networked
computer.