Telephone 057-93-26000

Blogs —› Septic Tanks

Draft National Inspection Plan for Domestic Wastewater Systems

Posted on October 19, 2012 by 2 Comments

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

Septic Tanks: How they work and tank sizing

Posted on July 4, 2012 by Comments are off

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.

Continue reading…

Domestic Wastewater Treatment: An Introduction

Posted on July 4, 2012 by Comments are off

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.

Continue reading…

Identifying your Septic Tank Problem

Posted on June 29, 2012 by Comments are off

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.

Continue reading…

New Septic Tank device from Molloy Precast

Posted on June 7, 2012 by Comments are off

In the coming months Molloy Precast will be bringing to market in a percolation distribution device that has the potential to solve common problems associated with septic tank percolation areas. In the presence of Phil Hogan, Minister for the Environment on his recent visit, Molloy Precast signed a licence agreement with Trinity College Dublin who have designed and patented the device.

Continue reading…

  • Molloy Precast Blogs
  • Like us on Facebook
  • Follow us on Twitter
  • Archive
  • Follow us on LinkedIn
  • Tags