Dissolved Oxygen Measurement in Wastewater Nitrification & De-Nitrification
Reduce Energy Costs & Optimize Activity of Microorganisms with Precise Dissolved Oxygen Measurements
Remove Toxic Ammonia from Wastewater Streams
The advanced treatment of sewage after the aeration basins may include a two step process of nitrification and denitrification for the removal of nitrogen. The majority of nitrogen is in the form of ammonia and can be toxic to aquatic life. Nitrifying bacteria in nitrification basins converts ammonia to nitrates, and denitrifying bacteria converts nitrates to nitrogen gas, which is removed. Dissolved oxygen (DO) is critical for nitrification and denitrification as the microorganisms consume oxygen to grow and thrive. The concentration of dissolved oxygen is measured and controlled by bubbling air or oxygen up from the bottom of the basins. The oxygen concentration must remain high enough to support the microorganisms, but feeding too much oxygen to the basin results in a costly waste of pump power.
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Product Solutions
The Rosemount 499ADO Dissolved Oxygen (DO) Sensor is a membrane covered amperometric sensor that continuously measures dissolved oxygen between 0 and 20 ppm. This DO sensor is ideal for measuring dissolved oxygen in aeration basins in municipal and industrial wastewater treatment plants.
- Installs in aeration basins or sidestream samples
- Rugged construction
- Easily replaceable membrane; no special tools required
Temperature Range
32 to 122 °F (0 to 50 °C)
Measurement Range
0 to 20 ppm (mg/L) as O2. For measurements at the ppb level, choose Rosemount 499ATrDO Dissolved Oxygen Sensor.
Operating Pressure
0 to 65 psig (101 to 549 kPa abs)
The Rosemount 1056 Transmitter offers single or dual sensor input with an unrestricted choice of dual measurements, reducing the cost per loop and saving panel space. This multi-parameter liquid analysis transmitter offers a wide range of measurement choices, including differential conductivity, dual oxygen and many other combinations supporting most industrial, commercial and municipal applications. The modular design of the transmitter allows signal input boards to be field replaced making configuration changes easy.
- Fast and easy installation using Quick Start programming, auto-recognition of sensor boards and modular design
- Large customizable display provides at-a-glance view of pertinent information
- Visibility of process parameters by utilizing HART® or Profibus DP digital communications
Enclosure Rating
Polycarbonate. Type 4X, IP65.
Certifications/Approvals
FM/CSA/UL (See Product Data Sheet for complete list of certifications.)
Dimensions
Overall 155 x 155 x 131mm (6.10 x 6.10 x 5.15 in.). Cutout: 1/2 DIN 139mm x 139mm (5.45 x 5.45 in.)
The Rosemount 56 Dual Channel Transmitter is a line powered device that can accept inputs from pH/ORP sensors, ion selective electrode (ISE) sensors, flow, current, conductivity (contacting and toroidal) sensors, turbidity sensors, dissolved oxygen sensors, chlorine sensors and ozone sensors.
- Retrieve calibration and measurement information by accessing the data logger via USB
- Design efficient processes by utilizing the built-in PID controller
- At a glance view of pertinent information provided by the large customizable display
Certifications/Approvals
FM: Class I, Division 2, Groups A, B, C, & D • Class Il & lll, Division 2, Groups E, F,&G • T4
Weight
Rounded up to nearest lb or nearest 0.5 kg: 3 lbs/4 lbs (1.5 kg/2.0 kg)
Measurement Range
pH sensor: 0 to 14 pH
ORP Sensor: -1500 to +1500 mV
ORP Sensor: -1500 to +1500 mV
