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FAQ for Tricel

Why should I buy a tricel product ?
Tricel is global brand leader within the environmental industry. We have over 50 years manufacturing experience, with Tricel product operating in over 20 countries treating over 24 million litres of wastewater each day.
All products are fully traceable and manufactured with our ISO9002 quality standards. We are available for any technical assistance and offer a dedicated after sales service support.
Where do you deliver to ?
We deliver throughout Ireland. Tricel® products may be purchased directly from us or from our network of distributors. Contact us on 064 6632421 and we will advise you of your nearest distributor.

FAQ for environmental products

Wastewater treatment

Why not use a septic tank rather than a wastewater treatment plant?
A wastewater treatment plant treats the wastewater to a better quality, typically 20 times cleaner than a septic tank.
What is domestic wastewater?
Domestic wastewater is all wastewater generated inside the house, including grey water from sinks, showers, baths and sewage from toilets. Rainwater is not classified as grey water and should be directed to a soakaway
Do I need planning permission to retrofit a packaged wastewater treatment plant?

Yes, planning permission is required under the planning guidelinesay

Do I need a permit to retrofit a packaged wastewater treatment plant?
Yes, a permit should be sought from your local building control department as you may require a ‘consent to discharge’.  For more information visit https://www.gov.uk/permits-you-need-for-septic-tanks/overview
Where can I find an approved site assessor?
Most planning authorities in Ireland have a list of approved site assessors on their websites.
How do you know which type of wastewater treatment system is needed?
A site assessment must be carried out on the site to determine the site conditions. A suitably qualified assessor can only perform the site assessment and they will inform you of the type of system required. They type of treatment system selected is dependent on specific site conditions.



  • Septic tank system and percolation area
  • Secondary treatment system – septic tank, filter system and polishing filter for discharge to ground
  • Secondary treatment – Packaged Wastewater treatment system followed by a polishing filter for discharge to ground
  • Tertiary systems – polishing filters, constructed wetlands or package tertiary systems.

Wastewater treatment plants

Is the Tricel wastewater treatment plant certified?
Yes, Tricel wastewater treatment plants are certified to EN12566-3. View certification test results carried out by PIA an independent testing company. Any treatment plant installed in Ireland MUST meet the requirements of EN12566-3 series of standards approved by the European Committed of Standardisation TC165. The testing process includes water tightness, structural strength, durability and treatment efficiency. There tests are verified by the National annex.
What guarantee do you offer?
Tricel products are manufactured from GRP that by its nature is a non-corrosive material ensuring strength and longevity. All metals used in constructing the tank are stainless steel. Electrical and electro-mechanical equipment are guaranteed for the period of one year. Plant equipment and components are specifically designed or chosen to work effectively in the Tricel plant and when used correctly will provide a long lifespan. Guarantee commences from date of purchase.
Commissioning the Tricel plant?

Once the Tricel plant is installed and operational, it is important that it’s commissioned by our service team or a Tricel distributor to ensure it is working effectively. A commissioning certificate will then be issued to the customer.

Tricel WWTP operation

How does the Tricel plant treat wastewater
The Tricel sewage treatment plant is a submerged aeration plant. It’s divided into 3 chambers.


First chamber: Settling occurs in the first chamber removing any heavy solids

Second chamber: By supplying oxygen, ideal conditions are created for naturally occurring micro- organisms to grow. These micro-organisms feed on any impurities in the wastewater thus treating it.

Third chamber: Further settlement of finer particles takes place before the treated wastewater exits the plant. These fine particles are returned to the first chamber through a sludge return system.

What quality of wastewater is produced?
The required standards are 20:30:20 BOD, SS, NH4
During independent testing Tricel® achieved treatment results of 11:16:9
Is it possible for more than one house to share a wastewater treatment plant?
Yes, Tricel offers a range of different plants for different options. However, you will need to discuss this with your local planning authority.
Is the plant noisy?
Once installed correctly the noise level will not cause nuisance. If standing close to the plant, there is a slight “hum” from the air compressor.
Will the plant smell?
No, once installed correctly and operated within its parameters.
How long does it take for the plant to start working?
It may take up to 16 weeks for the biomass to become fully established and to reach optimum purification.
What happens if I get a power cut?
A temporary power cut should not affect the plant. It is important to check the plant after a power cut to ensure the plant has restarted.

Tricel WWTP installation

Can I install it myself?

Tricel WWTP provides a comprehensive installation guide with each plant supplied. You should ensure that you are confident that you can meet requirements outlined in the guide before you attempt installation. Advice on specific site conditions etc. should be sought from your onsite engineer.

Do I need concrete to install the plant?
A concrete base and surround is not required where site conditions are considered dry. However if the site is considered wet or where a 500mm/750mm riser is fitted a concrete surround is required. Your engineer will advise a suitable installation requirement based on your site conditions.
What is considered a dry/wet site?

A dry site is one where the water table never rises higher than the base of the Tricel plant.
A wet site is one where the water table may rises higher than the base of the Tricel plant

How can I tell if I have a high water table?
This may be determined by digging a trial hole and leaving it open for 48 hours during the site assessment. Water level is measured from ground level.
Where do I locate the plant?

Minimum distance in metres

Septic tank, intermittent filters, packaged systems, percolation area, polishing filters(m)
Wells See table 6.1 EPA CoP
Surface water soakaway 5
Watercourse/stream 10
Open drain 10
Heritage features, NHA/SAC See table 6.1 EPA CoP
Lake or foreshore 50
Any dwelling house 7 septic tank*, 10 percolation area**
Site boundary 3
Trees 3
Road 4
Slope break/crust 4

Guidelines for the EPA code of Practice

*Septic tanks include all types of plants outlined in row 2

**Percolation area include all polishing filters

Posted in: Tricel WWTP installation

What is a polishing filter?
A polishing filter commonly known as a percolation area consists of either soil or sand. The polishing filter further treats sewage from intermittent filters, construction wetland and sewage treatment plant and to allow for discharge of treated sewage to ground.
Can I reuse the treated wastewater?
No, Irish regulations states that all wastewater must be discharged into a polishing filter.
Can I plumb surface water/rainwater to the plant?
No, surface water/rainwater should be plumbed separately to the sewage treatment plant.
What is a grease trap?

To maintain efficient operation of your septic tank and WWTP, it’s important that grease, fats and oil are not disposed of down the sink.


It is best practice to install a grease trap prior to your sewage treatment plant or septic tank particularly if sewage contains high levels of grease. A grease trap captures the grease by reducing the flow rate of the water into the plant. The sewage starts to cool down and the grease float to the top of the trap.

Tricel WWTP maintenance

How often do I need to empty my sewage treatment plant?
When the sludge is occupying 50% of the volume of the primary chamber de-sludging is required. This is when the sludge is 700mm deep. De-sludging intervals depends on use, but is recommended on a yearly basis to prevent the build-up of sludge and should be carried out by a licenced company. Your local councils should have a list of licensed contractors. De-sludging is the responsibility of the homeowner.
Do I really need a service/maintenance contract?
Yes, all wastewater treatment plants require a certain amount of ongoing maintenance to ensure the plant is working correctly and the wastewater is treated to the required standards.

The property owner has a responsibility to ensure that plant does not cause pollution, a health hazard or nuisance.

Is there an alarm in the plant?
Yes, the alarm will sound to alert a fault in the air compressor or the discharge pump. This does not replace the need for regular inspections.
How often should I have my sewage treatment plant serviced?
You should have a full service on your Tricel Novo once a year. Every service should be carried out by a suitably trained professional. This will guarantee the efficiency of the plant is maintained.
What checks should be carried out during a service?
We recommend that the following are inspected by your engineer during the service of your Tricel Novo.

  • Sludge return
  • Functionality of blower and / or pump
  • Pump pressures
  • Pump filters
  • Pump diaphragm
  • Alarm
  • Ventilation functionality
  • Diffuser monitored to check for dispersion of air
  • Tricel covers and locks
  • Manifold adjusted
What is covered in a service/maintenance contract?
A service contract from Tricel typically consists of the following

  • Sludge return checked
  • Functionality of blower and / or pump                    
  • Pump pressures
  • Pump filters are replaced
  • Pump Diaphragm checked
  • Alarm checked
  • Ventilation function tested
  • Diffuser monitored to check for dispersion of air
  • Tricel covers and locks checked
  • Manifold adjusted (if applicable)

All service contracts are carried out by qualified and experienced site crews.

How much does a service cost?
Tricel offers a variety of service options to best suit customer need. Competitive prices are available from our sales department.