A brilliant green lactose bile broth
A lactose or lauryl tryptose broth
A nutrient agar
Undissolved clumps in solution
The primary cause of floc carryover
Spots of coagulant attaching to the sides of the basin.
An unavoidable operating problem associated with solution tanks
Covering the storage facilities
Exposing a large surface area to the atmosphere
Increasing the pressure
Reducing its temperature
98 - 105
120 - 150
158 - 165
200 - 212
0.5 - 1
2 - 6
10 - 12
Reaching terminal head loss.
On a routine, periodic schedule, but not to exceed two applications per year
On a seasonal basis
After trend information has been established and adequate monitoring is practiced.
During extended periods of warm water temperatures
Floc carryover from the sedimentation system
High chlorine residual
Can only be used by large treatment facilities
Eliminates the need for a metering pump
Eliminates the need for chemical handling.
Is suitable for small water systems
After lime feed.
In the clearwell
To raw water at earliest stage possible.
With lime feed
Certain inorganic elements
Herbicides and pesticides
Without much effort
Customers should be told to boil their water
The system must collect a set of repeat samples within 24 h.
The chlorine residual should be increased to 1.0 mg/L
The water main should be flushed for 24 h.
Contamination of the system by backsiphonage
Ice formation in the pipes
Loss of chlorine residual
The type of chemical selected.
Lowering the water temperature after flocculation.
Maintaining a uniform, horizontal, low-velocity flow across the basin
Maintaining a uniform sludge blanket
Reducing the detention time
Backwash inlet valve
Used for hardness reduction
Used for pH adjustment