Interactive Generator · 2026
STP Tank Schedule & Layout Generator
Turn a sewage treatment plant's KLD capacity into a tank schedule — the working volumes of every stage from collection to treated-water storage, plus the total tankage and an approximate footprint you can pencil onto a concept layout.
Working volume of each tank — a proxy for the layout proportions
Plant capacity
Kilolitres per day — the design flow the plant treats. Try your figure from the STP capacity calculator.
Tank schedule
Indicative working volume of each treatment stage for a 100 KLD plant.
| Tank | Volume (m³) | Purpose |
|---|---|---|
| Collection / Raw sump | 16.7 | Receives and buffers incoming raw sewage |
| Equalization tank | 33.3 | Evens out flow and load over the day |
| Aeration tank | 33.3 | Biological treatment — the core reactor |
| Secondary clarifier | 12.5 | Settles treated sludge from clear water |
| Sludge holding | 4.2 | Stores excess sludge before dewatering |
| Treated water tank | 16.7 | Holds final treated water for reuse |
| Total tankage | 116.7 | ≈ 58 m² footprint at 0.5 m²/m³ |
How this is calculated
- Each tank volume = capacity (KLD) × retention hours ÷ 24. E.g. the aeration tank holds 8 hours of flow = 100 × 8 ÷ 24 = 33.3 m³.
- Total tankage = sum of all six tank volumes = 116.7 m³.
- Approx. footprint = total tankage × 0.5 m²/m³ = 58 m² — a planning rule of thumb including walkways and equipment.
Indicative proportions for concept layout only. A detailed design must fix peak factors, freeboard, tank geometry and civil arrangement — confirm with a qualified consultant before procurement.
Related Guides — Deep-dive reading
How Does an STP Work? A Step-by-Step Explanation
Follow a single drop of sewage from the building drain to reusable water — through screening, settling, the living microbial heart of the plant, and final polishing — with every stage explained in plain language and no engineering background assumed.
Sewage Treatment PlantsThe Sewage Treatment Process Flow, Explained: Every Stage From Inlet to Reuse
Follow a drop of sewage through a typical STP — inlet, screening, aeration, clarifier, filtration, disinfection and reuse — as one connected flow, with a block diagram and a unit-by-unit table, in plain language.
Sewage Treatment PlantsReducing an STP's Carbon Footprint: The Net-Emissions Guide
An STP burns power around the clock — but the treated water it produces displaces tankered and pumped freshwater. This guide shows how to weigh the two, then shrink the net carbon footprint with efficient aeration, solar and biogas.
Sewage Treatment PlantsRelated Tools — You may also find these useful
STP Equipment Selection Wizard
Recommend key STP equipment sizes — blower air, feed pump, aeration tank and clarifier area — from plant capacity and inlet BOD.
WizardAir Requirement Calculator
Estimate the process air an aeration tank needs — enter flow, inlet BOD, O2 demand factor and transfer efficiency to get O2 demand and blower air in m3/day and m3/min.
STP CalculatorApartment STP Planner
Plan an apartment complex sewage treatment plant from flats and occupancy — get population load, sewage flow, recommended STP capacity in KLD, treatment technology and approximate space.
Planner