1. Flocculation Tank |
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Proper quality and quantity of dewatering synthetic polyelectrolyte is dosed and mixed thoroughly in the incoming sludge. |
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1.1 Sludge Feed |
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Conditioned sludge is spread fed On the gravity drainage section of the belt. Unique
side rubber lips help proper spreadinq of sludge. |
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2. Gravity Filtration |
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Maximum amount of free water is effecrlvelv drained out on the long section. Special
sludge ploughs and flips are. provided to increase drainage efficlencyofthe Sludge. |
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3. Filtration |
Filtration starts taking place in the gradual wedge formed between the two converging
filter belts, The twin filter belts with sludge sandwiched in between converg completely
on the first perforated take up roller. |
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4. Low Pressure Squeezing |
| First take up roller exerts an even pressure of about 0.15 kg/sq.cm on the sludge. It
further increases in the following rollers. |
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| 5. High Pressure Squeezing |
A linear belt tension of about 10 kg/cm is kept applied. The pressure increases uniformly on the following rollers. Maximum free water is thus intelligently and progressively squeezed out of the sludge. |
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6. Discharge |
| Dewatered sludge is scrapped off from both the belts by argonomlcally
placed doctor knives. Pressure of the knives on the belts is kept adjusted with the
help of tensioners. |
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7. Cloth Cleaning |
High pressur water jets are provided for effertive cleaning of both the belts. Clarified water from the treatment plant is also suitable and preferred. Cloth washed water is fed back to equalization tank or fed back with incoming sludge |
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8. Filtrate |
Is recovered and used back in the process. Thus hydraulics, water and mass balance of the entire system is designed in such a way that the net output from it is highly dewatered sludge |
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| 9. Cloth Alignment |
| Both the filter belts are provided with deviation sensors and pneumatic correctors.
This helps to keep the filter belt. properly aligned to give optimum performance and life. |