INTRODUCTION TO WATER TREATMENT & ABSTRACTION

Inside a contact tank

 

This is the sort of layout that can be found in a contact tank
The water has to travel round from the inlet to the pump suctions the time it takes is called the contact time & allows the chemical doses to do their job befor they get to the pumps.
This schematic is for an actual tank the contact time is about 2 hours from start to finish.

Have a look at the pictures below to see what a contact tank looks like

Under the aerator the inlet chamber

 

The overflow

 

the suction for a sample pump

 

the sump for the washout

 

the wier that comes from the aerator inlet chamber to the main contact tank

 

bit spooky down here its dark in this contact tank