Water Treatment Systems
Measuring in Wastewater and Ash Slurry
Thermal power plants consume high volumes of water, and they need to discharge wastewater coming from the following processes:
- Reverse Osmosis (RO) concentrate and RO cleaning fluids
- Wastewater from ion exchanger regeneration
- Cooling tower blowdown and boiler cleaning waste water
- Wastewater from flue gas desulfurization and wet scrubbers
- Ash pond overflow, coal storage run off
- Oily wastewater from oil storage (oil fired power plant)
Water Treatment of Wastewater coming from diffrent Processes
Sector
3 Applications (1. Checking dissolved Oxygen DO, 2. Checking pH and Conductivity, 3. Checking Conductivity) at several measuring locations
Application
pH, Cond and ORP
Measured Parameter
Key Requirements
Application Description
In the following, we will describe typical process steps and measuring locations in pretreatment of wastewater and final effluent control before discharge to the environment.
Application 1:
Wastewater from the power plant is sent to the clarifier to be neutralized with lime. This process creates a significant amount of build-up over time.
Application 2:
After neutralization, the wastewater is treated in an aeration tank by microorganisms. Dissolved oxygen is measured to control the aeration.
Application 3:
The water leaving the treatment plant must be within a pH range of 6.5 to 7.5 to ensure environmental requirements are met.
Application 4:
The water in the Ash Pond must be within a pH and ORP range to ensure the plant is meeting the environmental requirement.
Requirements of Application
Why Knick ?
Wastewater usually contains suspended solids – we offer sensors for these demanding conditions and sensor maintenance systems for automatic cleaning.
Furthermore, Memosens technology ensures interference-free measurements even in dirty and humid environments and at long distances.
Solution - Product Highlight
Features
- Dual channel any parameter
- Advanced diagnostics
- Memosens technology
- NAMUR status indications
- Hart, ProfiNet and EtherNet/IPcommunication options
Customer Benefit
- Small footprint due to double channel, split display
- Sensor diagnostics and alarm indication and transmission
(for Application 1)
Features
- Up to 130 °C, up to 12 bar
- PTFE ring junction
- Ag/AgCl, incl. silver ion trap and salt reservoir
- No contamination or blocking of thejunction
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
- SE571 annular junction resists fouling
(for Application 2)
Features
- Luminescence technology (optical)
- Range: 4 ppb to 25 ppm
- Digital communication to meter
- Maintenance by basic cleaning or replacement of cap
- No electrolyte required
Customer Benefit
- High accuracy
- Low maintenance
- Easy to calibrate
(Application 3)
Features
- Up to 135 °C, up to 6 bar
- Ceramic junction
- Viscous gel filling
- For aggressive media
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
(Application 4)
Features
- Up to 130 °C, up to 10 bar
- 2x open hole
- Solid polymer
- Sensor element: Platinum plate
- For heavy industrial application with a lot of impurities and precipitations
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
(Application 4)
Features
- Up to 130 °C, up to 10 bar
- 2x open hole
- Solid polymer
- For heavy industrial application with a lot of impurities and precipitations
- Memosens technology
Customer Benefit
- Long lifetime even in harsh conditions
- Remote calibration
- Sensor/cable connection can be submerged in water (Memosens)
(Applications 1-3)
Features
- Robust immersion fitting with high flexibility
- Wall mounting brackets
- Rinse function
- Wetting cup
- Various sensor adapters
- Available in PP-H and PVDF
- High chemical and temperature resistance
- Up to 250 cm immersion depth
Customer Benefit
- Unique design for easy maintenance in combination with Memosens technology
(Application 4)
Features
- Robust immersion fitting with high flexibility
- Wall mounting brackets
- Rinse function
- Wetting cup
- Various sensor adapters
- Available in PP-H and PVDF
- High chemical and temperature resistance
- Up to 250 cm immersion depth
- For up to three sensors
Customer Benefit
- Unique design for easy maintenancein combination with Memosens technology