Industry Focus
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Industry Focus
What You Should Know About Water And Wastewater Treatment
Theresa Hoffman
Turn on your faucet and clean water flows out. Flush a toilet or drain a sink, and everything disappears like magic.
But behind that everyday convenience is one of the most impressive engineering systems in modern life: water and wastewater treatment. They sound similar, but water treatment and wastewater treatment serve very different purposes. One delivers safe, drinkable water to your tap. The other protects public health and the environment by cleaning what we send down the drain.
Let’s walk through both journeys — and where the right industrial components make all the difference.
Part 1: Water Treatment
Goal: Make raw water safe for human consumption.
Step 1: Collection
Wastewater travels through underground sewer systems to a treatment plant. Along the way, it may carry, organic waste, grease and oils, chemical, food waste, debris and grit.
Where automation matters:
- Pump control panels
- Level monitoring in reservoirs
- Flow rate measurement
- Motor protection
Marshall Wolf Automation Solutions:
- Variable Frequency Drives (VFDs) to control pump speed and reduce energy consumption
- Industrial motor starters and overload protection
- Level sensors and float switches
- Industrial enclosures (NEMA 4X for wet environments)
Reliable pump control ensures steady flow without water hammer, over-pressurization, or wasted energy.
Step 2: Coagulation & Flocculation
Chemicals are added to help tiny particles clump together into larger masses called “floc.” This makes them easier to remove in the next stage.
Where automation matters:
- Chemical feed pump control
- Flow-proportional dosing
- Agitator motor control
- Tank level monitoring
Marshall Wolf Automation Solutions:
- VFDs for precise mixer speed control
- PLCs for automated chemical dosing logic
- Flow sensors and transmitters
- Digital timers and process controllers
Accurate dosing protects both public health and chemical budgets.
Step 3: Sedimentation
The heavy clumps settle to the bottom of large tanks, separating from the clearer water above.
Where automation matters:
- Sludge scraper drives
- Filter backwash pump control
- Differential pressure monitoring
- Valve actuation
Marshall Wolf Automation Solutions:
Automation ensures filters clean themselves at the right intervals — preventing breakthrough events.
Step 4: Filtration
Water passes through layers of sand, gravel, and sometimes activated carbon to remove remaining particles and contaminants.
Where automation matters:
- Chemical injection control
- ORP and residual monitoring
- Safety interlocks
- Alarm systems
Marshall Wolf Automation Solutions:
- Process controllers
- Stack Lights, Beacons for visual alerts
- Industrial networking components
At this stage, precision and redundancy are critical.
Part 2: What Happens After You Flush
Now let’s follow the water in the opposite direction.
Wastewater treatment deals with everything that goes down sinks, toilets, drains, and industrial discharge lines — plus stormwater collected in sewer systems. I want to help all the hard workers at wastewater treatment plants by spreading the message to stop using those “flushable wipes”, we heard you loud and clear, and completely understand the nuisance of them clogging up your process!
Unlike drinking water plants, wastewater facilities are designed to remove contaminants from used water before releasing it back into the environment.
Step 1: Collection & Lift Stations
Wastewater travels through sewer systems and is often lifted by pump stations. This is where those problematic wipes and other things that shouldn’t go down the drain come into play.
Where automation matters:
- Pump sequencing
- Level control
- Backup power monitoring
- Remote alarms
Marshall Wolf Automation Solutions:
Wastewater lift stations must operate reliably in harsh environments
Step 2: Preliminary & Primary Treatment
Screens remove debris. Solids settle out.
Where automation matters:
- Screen drive motors
- Conveyor systems
- Sludge pump control
- Torque monitoring
Marshall Wolf Automation Solutions:
- Heavy-duty motor starters
- VFDs for torque control
- Industrial relays
- Overload protection devices
Automation prevents clogs, mechanical damage, and downtime.
Step 3: Secondary (Biological) Treatment
Microorganisms break down organic waste in aeration basins.
Where automation matters:
- Blower motor control
- Dissolved oxygen monitoring
- Aeration basin mixing
- Energy optimization
Marshall Wolf Automation Solutions:
- High-efficiency VFDs for blowers
- Process sensors (level, temperature)
- PLC-based control systems
- Industrial cooling solutions for control panels
Blowers are among the largest energy consumers in wastewater plants — speed control directly impacts operating costs.
Step 4: Clarification & Sludge Handling
Solids settle, sludge is removed and processed.
Where automation matters:
- Rake drives
- Sludge thickener control
- Dewatering equipment
- Conveyor systems
Marshall Wolf Automation Solutions:
Sludge handling environments demand corrosion-resistant components.
Step 5: Disinfection & Discharge
Before release, wastewater is disinfected and monitored to meet environmental regulations.
Where automation matters:
- Chemical feed control
- UV system monitoring
- Flow verification
- Compliance reporting
Marshall Wolf Automation Solutions:
- Flow meters and transmitters
- Industrial networking devices
- Remote monitoring solutions
Regulatory compliance depends on consistent, accurate data.
Without water treatment, waterborne diseases would be common. Without wastewater treatment, rivers, lakes, and groundwater would quickly become unsafe.
These two systems work together in a continuous cycle — one delivering clean water to our homes and businesses, the other ensuring what we put down the drain doesn’t harm the world around it.
Clean water in. Clean water out. That’s engineering at its most essential.
Interested in learning more about water and wastewater solutions?
