above the water line to prevent the scum crust from flowing into the top of the pipe. The 'T' pipes need to protrude at least 300mm. This slows down the passage of sewage and helps prevent the contents of the Primary Chamber from disturbances, allowing easier settlement. The inlet and outlet pipes are 'T' pipes which direct the inflow to under the water line. There is also only a very short distance for horizontal settlement between the inlet and outlet pipe. They tend to produce an effluent which is far more 'septic' (oxygen-stripping) than the traditional design due to the fact that the only air/sewage contact interface is the small area in the neck of the tank. The 'onion' type fibreglass tank does not work as well as the old fashioned brick one in our experience. Types of Septic Tanks - traditional and fibreglass The effluent then transfers via a baffle, pipe or weir to the SST where the process is repeated. This body of effluent contains anaerobic bacteria and chemicals like nitrogen and phosphorous, plus a fairly large proportion of suspended solids – tiny bits that float around in the water. In the middle is a relatively clear effluent layer. Anything heavier than water sinks to the bottom to form the sludge layer.
This layer known as the scum layer or crust. Anything that floats rises to the top of the tank and aerobic bacteria colonise it, digesting the organic material and preventing the effluent from becoming too septic. The first section is the primary settlement tank (PST) and the second section is the secondary settlement tank (SST) The sewage enters the PST from the sewer pipes in the house. In the top picture, you can see that the tank is divided into two sections. Septic Tank Registration and Inspection- IRELAND Phosphate Reduction In Sewage Treatment Plants Which wastewater treatment system Is The BEST?ĭischarge to drainage ditches - who owns the ditch? Sewage Treatment Plants for Schools, Offices and Building Sites Sewage Treatment Systems for Pubs, Hotels and Restaurants Sewage Treatment Systems for Campsites, Holiday and Caravan Parks Savings with the FilterPod Wastewater Treatment Plantĭomestic Sewage Treatment Plants for Houses How The Vortex Can Be So Energy Efficient
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