PERCENTAGE OF SOLUTION – MAKE - UP
0.25-1.0% solution of cationic polymers.
0.1-0.5% solutions of nonionic and anionic polymers.
JAR TEST DOSAGE CALCULATIONS
Remember that :
0.1% solution is 1,000 ppm.
0.25% solution is 2,500 ppm.
0.5% solution is 5,000 ppm.
1.0% solution is 10,000 ppm.
And that:
b.
ppm dosage = (ppm polymer or inorg. sol.) x (ml sol. added) ( ml water sample dosed)
JAR TEST MIXING PROCEDURE
Flocculant: Rapid mix for 30 sec. at 80-100 rpm. Slow mix for 3 min. at 10-20 rpm.
TEST PROCEDURE AND WORK PLAN
Because of water quality variations and unknown factors influencing coagulation and flocculation, it is impossible to predict the types and amounts of reagents necessary to achieve the desired result economically. Therefore, trial and error experimentation via the jar test procedure must be carried out, preferably with fresh water samples at the job site.
DATA RECORDING
On the jar test data sheets record floc size, settling rate, and supernatant clarity on a scale of 1 to 10. The best is represented by 10. Untreated control samples are represented by 5. Good results as compared to the control are then graded 6-10. Results poorer than control are graded 1-4. No visible effect, as compared to the control, is graded as 5.
In some cases you may also be interested in the volume of sludge produced and how this volume may vary depending upon the treatment. This can easily be done using graduated jar test beakers after a given period of settling time. Record in "Comments" section. |
