Some modification of the conventional activated sludge treatment systems has been developed that serves to improve the efficiency of the activated sludge treatment process. You can also get aerated wastewater treatment plant installed to get faster recycling of water.
Aerated wastewater treatment system is modified briefly discussed as follows:
1) Aeration Tapered
As the influent waste after primary settling (viz. The primary waste with high BOD) enters the top end of the aeration tank, it has oxygen demand is relatively higher.
At this distance from the inlet of the aeration tank, the oxygen demand increases. This realization has led to modifying the processing of waste activated sludge through aeration tapered.
2) Step Aeration
It is another modification, which is based on the same concept, namely, oxygen consumption of liquor mixture, decreases as the distance from the inlet wastewater aeration tank increases.
In this type of aerated wastewater treatment system, activated sludge was returned was brought in at the end of the aeration tank inlet but the primary waste is taken at a different position from the inlet end for some distance towards the end outlet.
3) Extended Aeration
Type aerated wastewater treatment system characterized by a low BOD load and is commonly used to treat wastewater from small communities, residential colonies, and schools.
Aeration period of 24 hours or more. Extended aeration can receive periodic load without getting angry. Stability results of the process of large volume aeration and mixing the complete contents of the tank.