SEWAGE TREATMENT
Septic tanks in Northern Ireland
Septic tanks play a vital role in the treatment of wastewater for properties not connected to the main sewage system. NI water septic tank solutions are needed to efficiently treat your wastewater. At Tricel, we provide high-quality septic tanks in Northern Ireland designed to meet the specific needs of both residential and commercial properties.
The Tricel Vento septic tank is suitable for single dwellings and small communities ranging from 6 to 20 population.
A good choice for sites with a lot of land drainage available, the Tricel Vento septic is popular with those looking to purchase a new septic tank for their home or business.
If you have any questions, feel free to call us
Key Features & Advantages of Tricel's Vento septic tank:
- The Vento septic tanks are manufactured from HDPE, making them durable yet lightweight, making installation quick & easy.
- Low-profile tanks are simple to install because less excavation is required for the tank, which saves you both time and money.
- It is certified to EN12566-1, ensuring and protecting the environment and your peace of mind.
- They have a ten years warranty from the date of purchase.
- It comes with an integrated outlet filter system that extends the life of the soakaway.
How does a septic tank work?
A septic tank is an underground tank which can be made of concrete, GPR, or plastic through which domestic wastewater (sewage) flows for basic sewage treatment.
It has an inlet and an outlet, and it is a simple overflow system.
There is no mechanics, no air compressor, no discs.
As seen on the image (Tricel Vento), the water comes in from the house through the dip pipe (1), the solids in the water sink towards the bottom, and the lighter of the solid matter float to form a scum layer.
Then, the untreated wastewater overflows into chamber number 2 keeping most of the solids on the inlet side. The fluid passes over the baffle (2), and it is discharged through the outlet pipe (3), having gone through a filter (in the example).
Septic tanks can have one, two, or three chambers. Discharge from the outlet is only permitted into a drainage field, as additional treatment is necessary.
Are concrete septic tanks better?
Below are the pros and cons of each solution:
PLASTIC SEPTIC TANKS
The type of plastic used is crucial, as not all plastics are the same. At Tricel, we utilise high-density polyethylene (HDPE) combined with advanced blow moulding technology. Our tanks are:
- Strong and durable
- Easy to install (featuring a super low profile, requiring minimal excavation)
- Reliable and effective
- May need a concrete base or backfill in wet site conditions
CONCRETE SEPTIC TANKS
In general, concrete septic tanks are perceived as strong and durable. However, the quality can vary considerably depending on the grade and quality of the concrete used during manufacture and the production/moulding process. They can also be:
- Heavy to manoeuvre
- Challenging to install (requiring bigger machinery)
How much are septic tanks in Northern Ireland?
The cost of a septic tank is ultimately determined by the size of the tank that is being installed.
There is a difference between a septic tank and a wastewater treatment system. Offering a higher treatment, the wastewater treatment or sewage treatment plants are more expensive to buy than a septic tank.
| Number of bedrooms | P | Minimum size of septic tank | Tricel septic tank recommendation | Tricel sewage treatment recommendation |
|---|---|---|---|---|
| 1 | 3 | 2450 | Tricel Vento 6 | Tricel Novo UK6 |
| 2 | 4 | 2600 | Tricel Vento 6 | Tricel Novo UK6 |
| 3 | 5 | 2750 | Tricel Vento 6 | Tricel Novo UK6 |
| 4 | 6 | 2900 | Tricel Vento 6 | Tricel Novo UK6 |
| 5 | 7 | 3050 | Tricel Vento 12 | Tricel Novo UK8 |
| 6 | 8 | 3200 | Tricel Vento 12 | Tricel Novo UK8 |
| 7 | 9 | 3350 | Tricel Vento 12 | Tricel Novo UK10 |
| 8 | 10 | 3500 | Tricel Vento 12 | Tricel Novo UK10 |
| 9 | 11 | 3650 | Tricel Vento 12 | Tricel Novo UK12 |
| 10 | 12 | 3800 | Tricel Vento 12 | Tricel Novo UK12 |
What certifications should a septic tank have?
All septic tanks in Northern Ireland must have EN12566-1 certification, which also conforms to the Irish Standard – S.R.66.
Consent to discharge NI
For more information on the consent to discharge form for the Northern Ireland Environmental Agency (NIEA), please click here.

How is a sewage treatment plant different?
A sewage treatment plant, such as our Tricel Novo is an advanced solution for wastewater management, this innovative system utilises a three-stage treatment process that includes primary settlement, aeration, and final settlement, ensuring the efficient breakdown of organic matter and the production of high-quality effluent. The Tricel Novo features a compression-moulded SMC tank, ensuring durability and minimal maintenance requirements. Its compact design allows for easy installation, even in limited spaces, and the system operates quietly with low energy consumption. With its robust performance and compliance with environmental regulations, the Tricel Novo sewage treatment plant offers a sustainable and effective solution for managing wastewater, safeguarding public health and the environment.
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Key Features

Fast Delivery
Fast delivery + Rapid response to all our customers

Certified
Tricel Products are certified to EN12566-1 and EN 12566-3 certified

Technical expertise
Unrivalled technical expertise by our team regarding wastewater treatment solutions



