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Awarded contract for Athenry Mart Co-Op WWTP

by on July 8, 2013 in News, Featured Projects, Wastewater Treatment

Athenry Mart Co-Op has awarded Molloy Environmental Systems, a division of Molloy Precast, Tullamore, the contract to construct a new wastewater treatment plant to treat animal wastewater collected in the Mart. The system to be installed uses a novel wastewater treatment technology, developed locally by NUI Galway and licenced to Molloy Environmental Systems, known as the “Pumped Flow Biofilm Reactor” (PFBR). The contract was awarded due to this technologies numerous benefits including; low energy costs, ability to handle strong influents (Typical of that emitted from Marts), low maintenance costs and low sludge yields. The company have installed this technology in numerous villages and are working with other industrial applications such as Fish processing facilities. The Athenry Mart project is expected to commence in September of this year and is to be completed within 4 months. The treated effluent from the plant is to be discharged into the town’s wastewater treatment plant before being discharged into the Clarinbridge River.

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Shannonbridge 500 PE WWTP

by on May 31, 2013 in News, Featured Projects, Wastewater Treatment

Molloy Environmental Systems have developed a Plug and Play wastewater treatment plant using PFBR technology. The first application of this technology is a 500 PE equivalent (225litres/person/day) wastewater treatment plant at Shannonbridge, County Offaly.

The use of a plug and play containerised system suited this site due to the risk of flooding. The existing Imhoff tank was utilised as a primary settlement tank, precast concrete tanks were installed for balancing and a concrete base was constructed for the Plug and Play PFBR unit. A precast concrete screen chamber was installed for preliminary screening.

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Sponsorship announced of the 2013 Offaly GAA Hurling Championship

by on February 28, 2013 in Community, News

Molloy Environmental Systems, Clara Road, Tullamore are this year’s sponsors of the Offaly Hurling Championship. Speaking at the official launch at O’Connor Park, Tullamore on Tuesday 26th of February, Donal Molloy, managing director said: “We are delighted to be able to sponsor such a prestigious tournament. We see it as the joining of two forces that have much in common; a desire to excel and to show best practice.”

“It is important for local businesses to invest locally. I firmly believe as do my team that Offaly is a great county and we as a company should support where and when we can, local organisations that reach out and unite local communities.” continued Mr. Molloy.

Offaly Hurling Championship Draw 2013
Overseeing the draws for the Molloy Environmental Systems Offaly GAA Hurling Championships 2013 were left to right; Joe Higgins (Vice Chairperson, Offaly County Board), Mary Dunne (Competition Secretary, Offaly GAA), Donal Molloy (Molloy Environmental Systems) and Padraig Boland (Chairperson, Offaly County Board).

The sponsorship extends to the Senior, Intermediate, Junior ‘A’, Junior ‘B’ and Under-21 Hurling Championships. For details of draws, please see link:

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Draft National Inspection Plan for Domestic Wastewater Systems

by on October 19, 2012 in News, Wastewater Treatment, Septic Tanks, Percolation

The Environmental Protection Agency (EPA) is developing a National Inspection Plan for Domestic Waste Water Treatment Systems (to be called the ‘Inspection Plan’ throughout this document) as required under the Water Services (Amendment) Act 2012. Domestic waste water treatment systems can and do cause pollution when they are not properly sited, installed or maintained. This discussion document sets out the general principles which the EPA proposes to use in the Inspection Plan, drawing on experience and best international practice in science and regulation. The EPA invites interested parties and individuals to submit comments for consideration.

See link to draft National Inspection Plan >>

Draft Septic Tank Inspection Plan


Environment Minister Visits Molloy Precast

by on September 12, 2012 in News

Phil Hogan T.D. Minister for the Environment, Community and Local Government described Molloy Precast’s facility as “fantastic and hugely educational” during his official visit on Thursday June 7th.  He was there to officially open the company’s purposely built percolation demonstration and rainwater harvesting facility at Clara Road, Tullamore, Co. Offaly. The weather which greeted the minister on the day was quite apt with water, water everywhere.

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Percolation Area: How it works, Installation Errors and Sizing

by on July 4, 2012 in Percolation

How does a percolation area work?

A percolation system is now standard for all new septic tanks installed in Ireland today. These systems are engineered to treat the partially treated effluent from the septic tank and to distribute this treated liquid into the underlying ground water. If constructed correctly, and the site has the right conditions a standard percolation system will last trouble free for many years with little maintenance. A typical percolation system is composed of a series of trenches half a meter wide and 18m long. Each trench is made up of the following components as seen in the image below, 250mm of clean stone, a 4” distribution pipe, a second layer of clean stone to cover the pipe and a geotextile membrane covered with a layer of soil brought up to ground level. It is important that the trench is ventilated for an adequate oxygen supply. This is achieved by connecting the pipes at the end of each trench together and pointing a single pipe out of the ground for ventilation. This ventilation pipe can be brought up near a fence or boundary if desired. Effluent from the septic tank has to be fed into a distribution box. The purpose of this box is to ensure that each trench receives an equal volume of wastewater. Over dosing one trench will cause that trench to breakdown.

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Septic Tanks: How they work and tank sizing

by on July 4, 2012 in Septic Tanks

How does a septic tank work?

The purpose of a septic tank is to separate solids and fats, oils and greases (FOG) from the wastewater, emitting only a clarified liquid. As can be seen in the image below, solids settle to the bottom of tank creating the sludge layer while FOG rises to the top creating the scum layer. This leaves a clarified liquid in the centre which is discharged into the percolation area.  A septic tank should also have tees at the inlet and outlet, the purpose of the inlet tee is to prevent the influent flow from disturbing the scum layer, dissolving it back into the clarified zone. The purpose of the outlet tee is to prevent the scum layer being discharged into the percolation area. The contents of the septic tank is anaerobic, meaning there is no oxygen present. This results in the production of gases such as methane, hence, ventilation of the tank is required to release these gases. A septic tank should be designed to allow wastewater stay in the tank long enough to allow solids and FOGs separate from the clarified liquid. If this dwell time is insufficient, un-clarified effluent will be emitted from the septic tank which can cause the percolation area to break down.

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Domestic Wastewater Treatment: An Introduction

by on July 4, 2012 in Wastewater Treatment, Septic Tanks

Over 400,000 households in Ireland have on-site wastewater treatment systems. Typical wastewater treatment systems have two components, namely, a septic tank and a percolation area. Both components are essential to ensure adequate wastewater treatment. Inadequately treated wastewater can impact on the quality of ground water, drinking water and surface water which in turn can affect human health as well as the surrounding environment.

Domestic wastewater is made up of solids, biological pollutants as well as fats, oils and greases (FOGs). Removal of these materials is by a combined effort between the septic tank and percolation system. The purpose of a septic tank is to remove FOGs and solids from the wastewater, while the purpose of the percolation area is to biologically treat the wastewater, removing biological pollutants and to distribute treated wastewater into the groundwater network. It is vital that both components are installed and maintained properly to ensure a trouble free on-site wastewater treatment system.

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Identifying your Septic Tank Problem

by on June 29, 2012 in Septic Tanks

Today’s blog post spreads some light on how to identify what is wrong with your septic tank. If you are having difficulties with your Septic Tank, the decision tree below helps find the issue with your septic tank, and mentions possible solutions.

Flow chart to help identify Septic Tank problems

Troubleshooting problems with the on-site wastewater treatment system

Problems with septic tanks are generally noticed when toilets and other household utilities stop functioning properly or if the septic tank begins to overflow. The first thing to check when this happens is if the pipes leading to the septic tank are blocked. If the water levels in the septic tank are normal, then there is a blocked or collapsed pipe somewhere. If this is not the case there is either something wrong with the septic tank or the percolation system. Listed below are some common problems and some solutions, it is recommended that where a complicated problem is encountered the homeowner consult with a competent person/company.

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Site Assessors in Ireland

by on June 27, 2012 in Percolation

Home Builders: Molloy Precast will provide you with a Site Suitability Report; however, this report is based on a site characterisation report completed by a competent and qualified person i.e. a site assessor. This page provides you with a list of names and contact details county by county of site assessors.

Site Assessors: To be included in this list, free of charge, please phone John Brennan on 057 93 26000 or email

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