WASTEWATER TREATMENT
Sewage Treatment Plant Size
Choosing the right sewage treatment plant size is essential to ensure it can manage the volume and type of wastewater produced in a given location, helping to prevent overflow or system failure.
Correct sizing improves performance, lowers running costs, and reduces environmental impact by making treatment more effective. It also supports compliance with regulations, protecting both public health and the environment from the risks linked to insufficient wastewater treatment.
How to determine the size of your wastewater treatment ?
To determine the size of an individual sanitation system, a standard metric is used. In Ireland, this is based on the equivalent population figure.
What is Population Equivalent or PE ?
According to the OECD, “Population equivalent” in wastewater monitoring and treatment refers to the quantity of oxygen-consuming substances that require the same amount of oxygen during biodegradation as the wastewater produced by one person. For calculation purposes, one unit is assumed to equal 60 grams of BOD (Biochemical Oxygen Demand) per day.
How to calculate the Population Equivalent (PE) in Ireland ?
The population equivalent will be calculated with the number of bedrooms in the house.
This calculation is from the Code of Practice: Waste Water Treatment and Disposal Systems serving Single Houses for all installations below 10 PE, please see table below:
| Number of bedrooms | Population Equivalent (PE) |
|---|---|
| 2 | 4 |
| 3 | 5 |
| 4 | 6 |
| 5 | 7 |
| 6 | 8 |
| 7 | 9 |
| 8 | 10 |
How to pick the right wastewater treatment system?
To select the correct sizing, please review the table below:
| Size in PE | Tricel Novo (wwtp) | Tricel Vitae (NI only) | Tricel Vento (septic tank) |
|---|---|---|---|
| 1-6 | IE6 or IE6+ | UK 6 | Vento 6 |
| 7-10 | IE8 or IE10 | UK 9 | Vento 12 |
| 11-12 | IE12 | UK 12 | Vento 12 |
| 13-18 | IE18 | UK 15 | Vento 20 |
| 18-24 | IE24 | UK 20 | Vento 20 |
Why it’s important to determine the size of your sewage treatment solution.
Sizing correctly your installation is essential to make sure the system in place is not over utilised or under utilised.
What will happen if my installation is not the right size?
- If your sewage treatment plant is undersized, it won’t handle the volume of waste from your property effectively, leading to foul odors, blockages, and potential overflow issues.
- If your product is oversized: if you think having a larger product can reduce the number of desludging visits? You’d be right, however if the size is too large, the treatment quality will drop because there will not be enough wastewater supply for the treatment processes. The level of bacteria will not be enough to treat the wastewater properly and therefore will have an insufficient effluent quality (this is the case for wastewater treatment plants. For septic tanks, larger systems than required are not a problem).
Determining the size of your product really is a crucial step. For expert advice, contact our technicians today.
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Tricel Vento Septic Tank
Shallow dig tank, strong & robust underground tank, No electrical or moving parts. Ideal for sites with good drainage & plenty of space.
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Commercial plant. Submerged Aerated Filter (SAF) technology. Ideal for project over 50 PE.
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An eco-friendly and modular system with proven E.Coli Treatment capabilities in line with the new EPA requirements.
Tricel Puraflo Secondary treatment plant
Ideal for sensitive sites, compliant to Irish Standard, small footprint.
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Provides a dual function of polishing the effluent from a wastewater treatment system and disposing it into groundwater.
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Pump fluids from one place to another where gravity drainage cannot be used, easy and trouble-free installation
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