7/28/2019 Liq AppData 4950-14
1/3
BACKGROUND
Municipal wastewater treatment employs a
number of processes designed to clarify, disin-
fect, and condition raw sewage so that it may
be safely released into rivers and other bodies
of water. These processes involve both chemi-
cal addition and biological action. Chemical
concentration control, as well as sample moni-
toring, are necessary for efficient operation, toavoid upsets,
and to protect certain aspects of
the overall process. Figure 1 shows the primary
wastewater application.
PROCESSES
Influent: pH and other analyzers are used
to detect the presence of off-spec industrial
waste and provide warning to avoid major
upsets. For additional details, refer to ADS
4950-12.
Aeration/activated Sludge Process:
Dissolved oxygen measurement is used to
maintain an adequate oxygen supply to the
aerobic bacteria that is responsible for treating
the sewage. For additional details, refer to
ADS 4950-01.
Chlorination Chamber: Chlorine analyzers
are used to ensure adequate disinfection with-
out overchlorination. For additional details,
refer to ADS 4950-10.
Dechlorination Chamber: Chlorine (De-
chlorination) analyzers monitor the effluent
leaving the plant and provide a signal for con-
trol of dechlorination chemical addition. For
additional details, refer to ADS 4950-10.
LIQUID INSTRUMENTATION IN MUNICIPALWASTEWATER TREATMENT
Appl ication Data SheetADS 4950-14/rev.A
October 2004Water and Wastewater Industry
7/28/2019 Liq AppData 4950-14
3/3
Total Chlorine Sensor Model 499ACL-02
Maintenance takes only a few minutes a month.
No tools required to change membrane.
Replace sensor without running new cable using the Variopol
connector option.
Sample Conditioning System Model SCS921B
Amperometric measurement permits analysis of turbid samples.
Low reagent usage means unattended operation.
Uses ordinary 5% white household vinegar.
INSTRUMENTATION
TOTAL CHLORINE MEASUREMENT
Credit Cards for U.S. Purchases Only.
The right people,
the right answers,
right now.
ON-LINE ORDERING NOW AVAILABLE ON OUR WEB SITE
http://www.raihome.com
Emerson Process Management
Liquid Division2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: (949) 757-8500
Fax: (949) 474-7250
http://www.raihome.com
Rosemount Analytical Inc. 2004
Model 54e Analyzer
Three alarms, one fault alarm, and program-mable timer
function.
Two 4-20 mA outputs.
HART and AMS aware.
Optional PID and TPC control
Model 1055 Analyzer
Two 4-20 mA outputs
Three progrmmable alarms.
NEMA 4X (IP65) enclosure.
Choice of enclosures for panel or pipe/surface mounting.
Model Xmt Transmitter
Two-wire transmitter.
Choice of enclosures for panel or pipe/surface mounting.
NEMA 4X (IP65) enclosure.
Choice of HART or Foundation Fieldbus communication.
Model 5081 Transmi tter
Two-wire transmitter.
Robust NEMA 4X and NEMA 7B enclosure.
Choice of HART or Foundation Fieldbuscommunication.
Large, easy-to-read display with infrared remote controller.
All instruments shown are capable of measuring pH, ORP,
Conductivity, Dissolved Oxygen, Ozone, and Chlorine.
