Pulsator Clarifier

PULSATOR CLARIFIER

The original Pulsator Clarifier was developed in the early 1950's. Now it is a properitory item designed and installed by M/s.Degremant private Ltd.

Components of Pulsator clarifier are:

Vacuum chamber, vacuum pump and vent valve

1. Raw water distribution channel and perforated distribution pipes.

2. Lamellar Plates and/or Tubes for clarification.

3. Clarified water collection laterals and channel.

4. Sludge collection and concentrator Schematic and view of Pulsator clarifier are shown below

Working Principles of Pulsator Clarifier

• It consists of a flat-bottom tank with a series of perforated pipes at its base to distribute the raw water uniformly over the entire bottom,

• Coagulated water to pulsator flow intermittently through perforated pipes.

• Coagulant water is stored in the upper part of the vacuum chamber for a given period by creating vacuum.

• The hydraulic force in then released, and the coagulated water is pulsed at a high velocity through distribution pipes into the Pulsator.

• Sludge blanket in the pulsator flocculates and remove the particles.

• A set of channels (launders) is provided at the top of the Pulsator to collect the clarified water evenly.

• By removing the air by suction from the vacuum chamber vacuum is created. As a result, the water level rises gradually inside the vacuum chamber. When it reaches a set level between 0.35 m and 0.45 m above the Pulsator water level, a contact suddenly opens an air inlet valve.

• Atmospheric pressure is immediately applied to the water stored in the vacuum chamber, which pushes the water into the perforated distribution pipes at high speed, When the water level inside the vacuum chamber reaches the low level approximately 10-20 cm above that in the Pulsator, the air inlet valve is closed and the cycle begins once again with creation of vacuum.

• The sludge blanket in the bottom part of the Pulsator is subjected to alternating vertical motions. It expands when the water rushes from vacuum chamber during drop, for a short time (5-20 sec.) and then shrinks (packs) during vacuum creation which lasts 25-50 seconds.

• Thus once in about 60 sec the water is pushed into pulsator through sludge blanke and the sludge blanket expands and shrinks once during that time.

• Frequency of pulsing is adjusted according to turbidity in raw water; For high turbidity shorter pulse interval (30 to 40 sec) and for low turbidity longer puls interval (45 to 60 sec) is provided.

• The sludge blanket gradually increases in volume due to entrapping the impuritie To contained in the feed water. When the level of the sludge blanket rises above specified level (weir level) and sludge spills into the concentrators.

• Sludge concentrator contains number of hopper bottomed tanks; The sludge i extracted from the concentrators at regular intervals.