More project photos (3)
The problem
Industrial water treatment plants move raw water through a chain of stages — coagulation, flocculation, sedimentation, filtration and disinfection — and every stage depends on its electrical control: pumps must start and stop in the right order, tanks must not overflow or run dry, and chemical dosing must follow a schedule. Manual operation invites dry running, overflows and inconsistent dosing, which is why real plants are run from PLC-based control panels with motor protection, level interlocks and alarms. Electrical engineering students study these panels in theory but rarely wire and commission one. This project closes that gap with a tabletop working model: transparent stage tanks with real pumps, float switches and a wired control panel demonstrating sequencing, level control, timed dosing and protection.
Hold tank levels: a pump starts on low level and stops on high.
Follow the working sequence
How it works
- The raw-water pump fills the flocculation tank; its float switch stops the pump at high level and restarts it at low level.
- The dosing pump injects a measured dose on a timer cycle while the agitator motor mixes the tank for a preset time.
- Settled water overflows by gravity into the sedimentation tank model; the transfer pump moves it to the filter bed on level demand.
- The filtered-water pump delivers clear water to the storage tank only when the filter-bed level is healthy, with interlocks preventing dry running.
- A backwash timer periodically reverses the flow path through the filter bed to flush trapped sediment, demonstrating maintenance cycles.
- Any overload trip or overflow condition latches an alarm: the stage lamp turns red and the hooter sounds until the fault is acknowledged and reset.
Tech stack:
- PLC / relay logic: ladder-programmed PLC (Siemens S7-1200 class) or timer-relay panel
- Single-phase pumps for each transfer stage
- Float switches for level sensing
- Contactors, MCB, thermal overload relays
- Push buttons, selector switches, indicator lamps, hooter
- Peristaltic dosing pump with timer
- Transparent acrylic tanks and PVC piping (model hydraulics)
| Parameter | Value |
|---|---|
| Control | PLC (ladder logic) or timer-relay panel — configurable |
| Supply | 230 V AC, single phase, 50 Hz |
| Pumps | 3–4 × single-phase pumps (approx 0.5 HP class) |
| Tanks | 4 transparent stage tanks, approx 10–20 L each |
| Level sensing | Float switches, approx 2 per tank |
| Dosing | Peristaltic pump on adjustable timer cycle |
| Protection | MCB + thermal overload relay per pump circuit |
| Indication | Panel lamps per stage + hooter on trip/overflow |
| Piping | PVC model piping with manual valves |
| Sequencing response | Design target: stage changeover within seconds of level trigger |
Project features
- [Automatic pump sequencing] PLC/timer-relay logic starts the raw-water, transfer and filtered-water pumps in the correct order with interlocks, so a downstream pump cannot start against a dry suction.
- [Float-switch level control] Float switches in each tank hold levels automatically — pumps start on low level and stop on high level without manual intervention.
- [Dosing pump timer control] A peristaltic dosing pump runs on an adjustable timer cycle to demonstrate timed chemical dosing into the flocculation tank.
- [Motor protection wiring] Each pump circuit is wired through an MCB and a thermal overload relay, demonstrating standard industrial motor protection practice.
- [Panel indication and alarms] Indicator lamps show running/stopped/tripped status per stage; a hooter sounds on overload trip or tank overflow.
- [Manual / auto selector] A selector switch per stage lets the operator run the model in manual mode for demonstration or automatic mode for unattended sequencing.
- [Backwash cycle demonstration] A timed valve-and-pump sequence reverses flow through the filter bed model to demonstrate filter backwashing.
What is included
- Working tabletop treatment-plant control model with wired panel
- PLC ladder program (or relay wiring schedule) source files
- Panel wiring diagram and component layout drawing
- Complete component list with ratings
- Project report PDF (background, control logic, protection, testing procedure)
- PPT presentation for final review
- Viva Q&A preparation document (PLC logic, motor protection, level control)
- Setup and demonstration guide
Advantages
- PLC/timer-relay pump sequencing with interlocks prevents a downstream pump starting against a dry suction.
- Float switches in each tank hold levels automatically, starting pumps on low level and stopping them on high level without manual intervention.
- The timer-controlled peristaltic dosing pump demonstrates timed chemical dosing into the flocculation tank.
- Every pump circuit is wired through an MCB and a thermal overload relay, demonstrating standard industrial motor protection practice.
- Indicator lamps, a hooter, a manual/auto selector per stage and a timed backwash sequence make each stage's status and operation visible.
Disadvantages
- This is a tabletop demonstration model, so piping, flows and timings are illustrative and not sized to a real plant.
- Water is recirculated for demonstration, and the model does not produce potable water and is not a certified treatment device.
- Pump duty is light, and running the model dry or continuously for long hours can overheat the pumps.
- Float-switch positions need careful setting during commissioning.
- Timer-based dosing only approximates chemical dosing, whereas real plants use flow-paced dosing with analyzers.
Limitations & prerequisites
- Demonstration model at tabletop scale — piping, flows and timings are illustrative, not sized to a real plant.
- Water is recirculated for demonstration; the model does not produce potable water and is not a certified treatment device.
- Pump duty is light; running the model dry or continuously for long hours can overheat the pumps.
- Float-switch positions need careful setting during commissioning — the setup guide covers this.
- Timer-based dosing approximates chemical dosing; real plants use flow-paced dosing with analyzers.
Frequently Asked Questions
Which controller is used?
A ladder-programmed PLC (Siemens S7-1200 class) runs the sequencing logic; a timer-relay panel version can be built instead where a PLC is not required by the college. The wiring diagram and program ship with the project.
Does it actually treat water?
It demonstrates the treatment stages and their electrical control — pumping, mixing, timed dosing, filtration and backwash sequencing. It is a control-system model, not a certified water-treatment device.
What power supply is needed?
A standard 230 V AC single-phase socket; the panel steps control circuits down to 24 V DC where used. No three-phase supply is needed for the model.
Can the stages be changed?
Yes — tank count, pump order and timer values are configurable in the PLC program or timer settings, so the model can be adapted to a college-specified process flow.
What are the main limitations?
Tabletop scale, recirculated demonstration water, light-duty pumps, and float switches that need careful commissioning — the full list is in Limitations & Prerequisites.
Is this project suitable for a final-year project?
Yes — for Electrical Engineering programs. It demonstrates PLC ladder logic, motor protection, level-control sequencing and panel wiring, all strong viva material. Suitable for B.E./B.Tech final-year projects in Electrical Engineering.
Components & software requirements
- PLC / relay logic: ladder-programmed PLC (Siemens S7-1200 class) or timer-relay panel
- Single-phase pumps for each transfer stage
- Float switches for level sensing
- Contactors, MCB, thermal overload relays
- Push buttons, selector switches, indicator lamps, hooter
- Peristaltic dosing pump with timer
- Transparent acrylic tanks and PVC piping (model hydraulics)
Delivery information
Built-to-order project. Delivery timeline is shared after order confirmation based on current queue.
Support terms
Complete documentation, setup guide, and viva preparation included. Support for setup and explanation provided.
Download free synopsis (PDF)
Enter your name and WhatsApp number — the synopsis PDF downloads immediately. We may send occasional project updates on WhatsApp; no spam.