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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: | ||
Suspended Solids | |||
BOD<sub>5</sub> (Biological Oxygen Demand determined over 5 days) | |||
COD (Chemical Oxygen Demand) | |||
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: | ||
Suspended Solids - 30mg/litre | |||
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. |