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Sewage effluent is checked for many different polluting factors. These factors vary according to the individual countries' criteria, but in general, the five most important ones are:
Sewage effluent is checked for many different polluting factors. These factors vary according to the individual countries' criteria, but in general, the five most important ones are:
<p>Suspended Solids</p>
 
<p>BOD<sub>5</sub> (Biological Oxygen Demand determined over 5 days)</p>
Suspended Solids
<p>COD (Chemical Oxygen Demand)</p>
BOD<sub>5</sub> (Biological Oxygen Demand determined over 5 days)
<p>Ammoniacal Nitrogen (NH4-N)</p>
COD (Chemical Oxygen Demand)
<p>Phosphorous</p>
Ammoniacal Nitrogen (NH4-N)
Phosphorous


In the UK and many other parts of the world, sewage effluent has to meet the 'Royal Commission Standard'. This is a standard that was created in 1913AD as a minimum standard for the quality of wastewater allowed to enter a watercourse. It is a maximum of:
In the UK and many other parts of the world, sewage effluent has to meet the 'Royal Commission Standard'. This is a standard that was created in 1913AD as a minimum standard for the quality of wastewater allowed to enter a watercourse. It is a maximum of:
<p>Suspended Solids - 30mg/litre</p>
 
<p>BOD<sub>5</sub> - 20mg/litre</p>
Suspended Solids - 30mg/litre
<p>NH4 -N - 20mg/litre</p>
BOD<sub>5</sub> - 20mg/litre
NH4 -N - 20mg/litre


The above quality level will satisfy the vast majority of wastewater discharges, though in very sensitive sites, extra parameters may be set by the Authorities.
The above quality level will satisfy the vast majority of wastewater discharges, though in very sensitive sites, extra parameters may be set by the Authorities.
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