Stormwater Treatment Train
The stormwater treatment train is the process that the stormwater has to go through to ensure that the stormwater is completely treated before entering the waterways. A stormwater treatment train essentially has three different parts:
For effective treatment of stormwater, it is essential that stormwater goes through all the three stages of the treatment train. While Primary treatment is quite effective against litter and gross pollutants, it is not very effective against oils and grease, nutrients and heavy metals. It can be used in stormwater sewers to ensure that the litter does not end up in the oceans, thereby making them very vital in protecting the oceans and the marine life. We need to utilise Secondary treatment for the removal of Oils and grease from the stormwater. Tertiary treatment to ensure the stormwater nutrient and heavy metal concentration is to the desired level. Urban setups like car parks can have a high amount of oils, nutrients and heavy metals. Therefore, these places require the secondary and tertiary treatment of stormwater.
Therefore, while each stage of treatment train is effective for removal of a certain type of pollutant, it is necessary to combine the three stages to make sure the water is effectively treated. A single stage of treatment train can be utilised effectively as well, depending on the situation.
However, the best stormwater management practices definitely recommend ensuring the effective removal of all pollutants, therefore a complete utilisation of the treatment train.