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The table below lists three relatively simple coagulation tank types, which reflect some simple methods of using hydraulic stirring, as well as more specific general concepts about the working principle, design parameters, and shape of coagulation tanks.
Type | Partition type | Swirl | Vortex |
Main stirring function | The stirring effect at the bend of the water flow | Agitation effect of nozzle jet | The stirring effect of the inlet water flow diffusion |
Dwell time/min | 20-30 | 8-15 | 6-10 |
Stirring intensity control | Flow velocity and number of turns within the corridor | Nozzle outlet velocity and pool height to diameter ratio | Bottom inlet velocity, upward flow velocity in the upper cylindrical section, and cone angle |
Connection with sedimentation equipment | Connecting to the horizontal flow sedimentation tank | Used alone or built in a vertical flow sedimentation tank | Used alone or built in a vertical flow sedimentation tank |
Other layout options | The corridor can be arranged vertically. | Water can enter from the top of the pool and exit from the bottom. | The plane can be rectangular or square. |
Advantage | Simple structure and easy construction | Small volume, low head loss | Short reaction time, small volume, low cost |
Shortcoming | Large volume, large head loss | The pool is quite deep, making construction difficult in the deeper sections. | The pool is quite deep, making cone-shaped bottom construction difficult. |
Applicable conditions | Large water plants with water balance | Small and medium-sized water plants | Small and medium-sized water plants |
