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Sewage Treatment Plant - BIOROCK - How does it Work

How the BIOROCK Sewage Treatment Plant Works

  • The raw sewage first enters the settlement tank( made by Conder UK ) which separates the solids from the liquid part of the effluent.  This settlement tank is fitted with an effluent filterwhich prevents solids exiting the tank.  The Conder settlement tank digests most of the solids anaerobically and only requires emptying every 3 to 4 years.  (Existing traditional 2 stage septic tanks can also be used as this settlement tank.) 

  • The Primary Effluent then enters the BIOROCK Biofilter which uses alternate layers of air passages and natural fibre Inside a BIOROCK sewage treatment plantmaterial contained in nets.  This stone fibre is in constant contact with the air to treat the effluent in exactly the same way as Nature treats effluent in the soil or on the margins of a pond.

 

  • Bacteria grow in the stone fibre and digest the organic material as it is trapped in the matrix and the cleaned water trickles through.
 

BIOROCK filter media in the sewage treatment plant image

  • The Stone Fibre is self cleaning and so far, in the 13 years since the current design has been in operation, has not required replacement.  The photo on the right shows the stone fibre under a microscope,  The top photo is new stone fibre and the bottom photo is the top layer of the stone fibre after 18 months in the BIOROCK.  Note the completely open filter matrix with just the newly trapped solids being digested by the bacteria in the fibres.

 

  • The natural stone fibre works with nature, not against it and is self-cleaning.

     

     

  • Instead of using electricity-guzzling compressors to provide the air, the BIOROCK biofilter sewage treatment plant utilises the wind and natural 'chimney-draft' to pull the air through the plant with no electricity required.  The low end of the chimney has its inlet within 5 metres of the BIOROCK tank and the high end of the chimney usually exits underground and discharges within 10 metres up the side of the house or shed wall, tree, telegraph pole. etc. as a soil vent pipe.

 

The air vent system for the BIOROCK sewage treatment plant.

  • The Conder settlement tank is included in the sewage treatment package.  This is also vented to a soil vent pipe and therefore no smell is emitted from the tank.

 

Biorock sewage treatment plant cross section

 The final effluent can be discharged either to a soakaway or a watercourse 

 

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