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Common Problems:

1)      A quantity of sludge was left in the tank after emptying. This is normal; septic tank manufacturers recommend that some of the  active sludge is left behind in order to maintain the bacterial culture necessary for the biological processes.

Interceptors

 

Interceptors (or Separators) are special tanks which are installed in the surface water drainage system of a premises as a last line of defence against oil pollution.  They are designed to separate any oil and contaminated silts from the drainage water and retain them for periodic emptying.  Interceptors rely on the principal that oil floats on water and silt sinks, allowing these two constituents to be separated from the water, which is allowed to discharge from tank..

 

There are 2 main designs of Interceptor tanks:

 

1. Bypass interceptor - a single tank which utilises baffles and  compartments to separate and retain the oil and silt.  Under storm conditions, when flow rates are high, water is allowed to bypass the oil storage compartment to prevent stirring  up the contents and potentially allowing oil to be washed out.

 

2. 3 Stage interceptor - a series of (usually 3) connected settlement chambers which progressively remove the oil and silt in the drainage water.  Under normal conditions a good  degree of separation is achieved.  Should you need any further help or advise please contact our office.