Sewage Treatment Plants
Specialists in sewage treatment plant installation.
SEWAGE TREATMENT PLANTS
A sewage treatment plant treats foul waste from either a domestic or commercial property, to a standard so that it can be discharged directly into a watercourse, Drainage field or with a permit to a soakaway. The discharge from a sewage treatment plant does not need further filtration from either a drainage field or by other means. The benefit of a sewage treatment plant is that it can be used in areas where ground conditions are unsuitable to receive waste from a septic tank, such as clay ground, a high-water table or a ground water protection zone.
SEWAGE TREATMENT SERVICE
There is also less impact to smaller properties, where there is insufficient room for a drainage field or where odours from a septic tank may cause a problem. The outflow from a sewage treatment plant, unlike a septic tank, will not contaminate a drainage field with suspended solids, or anaerobic bacteria, therefore prolonging the life of a drainage field.
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SEWAGE TREATMENT PLANT TYPES
THE MOST COMMON TYPES OF SEWAGE TREATMENT PLANTS ARE:
ACTIVATED SLUDGE PROCESS
ASP is a sewage treatment process in which air or oxygen is blown into raw, unsettled sewage to smash the solids and develop a biological 'soup' which digests the organic content and pollutants in the sewage. These plants do not have a primary settlement chamber and therefore do not require emptying as frequently or produce unwanted odours.
In all activated sludge plants, once the sewage has been ‘aerated’ long enough, excess sewage liquor is discharged into a clarification chamber where live bacteria settle to the bottom, dead bacteria rise to the top and form a crust with a clear liquid in the middle. This clean water is then discharged into either a water course, Drainage field or a soakaway.
A primary settlement chamber holds solids where anaerobic digestion takes place. Clarified water then passes into a second chamber containing a submerged media, here it is treated to remove the dissolved constituents by aerobic bacteria, supported by diffused air, ensuring full treatment is achieved before the treated effluent and bacteria flows to a final settlement chamber. The final effluent is then discharged to the drainage field, watercourse or Soakaway.
A primary settlement chamber holds solids where anaerobic digestion takes place. Clarified water is lifted via an air lift and distributed evenly over the surface of the suspended filter media and digested by aerobic bacteria before entering a third and final chamber. The final effluent is then discharged to the drainage field, watercourse or Soakaway.
Sequential batch reactors are a type of activated sludge process for the treatment of wastewater. Sequential batch reactors treat wastewater in batches. Oxygen is passed through the mixture of wastewater and activated sludge to reduce the organic matter. The final effluent is then discharged to the drainage field, watercourse or Soakaway.
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