|
A streaming current monitor (SCM) was used to goven the
chemical dosage in the continued coagulation /flocculation
process and evaluated its feasibility for the application in
the automatic control of coagulation dose from many dosing
responses about various conditions. This continued data-logging
system offered the more sufficient data to the SCM responses at
various conditions than before. The unreasonable dosing
response was found at sudden increase on turbidity. It was due
to the misunderstanding about the means of SCM reading in the
previous studies. The effect of original charge on the SCM
reading from the sensor surface would not be neglected
,especially at a lower turbidity condiction. The modified
dosing model was developed and applied in this laboratory scale
process. The results showed that SCM operation with modified
control model was useful in the automatic control of
coagulation dose with regards to various turbidity conditions.
It was suggested that the application of SCM technique was
limited to the raw water with low ion strength(i.e. Drinking
water treatment) and to the operation with low alum dosage.
|