PWL

DAF is a gravity seperation process whereby the separation of two phases is achieved by increasing the specific gravity difference of the two phases. This is achieved by attaching micro air bubbles, brought about by saturating water with air under pressure, and then expanding the wa terstream through valves to atmospheric pressure. These micro bubbles nucleate onto the solid particles to be separated, thus lowering the specific gravity and allowing contaminants to rise to the surface.

Working Animation :

DAF is gravity separation process where by the separation of two phases is achieved by increasing the specific gravity difference of the two phases. This is achieved by attaching micro air bubbles, brought about by saturating water with air under pressure, and then expanding the water stream through valves to atmospheric pressure. These micro bubble nucleate onto the solid particles to be separated, thus lowering the specific gravity and allowing contaminants to rise the surface

Suspended solids, Grease and oil are very efficiently removed by DAF, and a combination of screening and DAF results in BOD/COD removals up to 60% depending on application. However a combination of Flocculation and flotation can result in BOD removal of around 80-90%. For wastewater containing high solid content, it is necessary to create a sufficient retention time for prewatering of the skimming.

The PWL series Flotation unit have been designed for capacities up to 200m3/hr. (As standard) Higher capacities are realized by combining or expanding systems. Standard construction is in carbon steel, but other material is possible. DAF systems in concrete are also possible. Saturation of air in water can be carried out by dosing the air in suction side of the Aeration pump. Dissolution takes place by Henry law , and the turbulence and energy in the pump provide excellent condition for the process.

Alternately, use can be made of saturation vessel, of conventional design for the air to Dissolve in the water. The recycle flow is mixed with the wastewater in the flotation unit, through a pressure pipe. Air bubbles formed adhere to the particles and give them buoyancy to float rapidly through surface These system donot use plate packs and are open tank, low unit separator, with the aeration point in the inlet as well as the sides of the tank to ensure excellent aeration along the entire tank length

PWL

To ensure high dry solid contents of the skimming, the solid loading (kg solids/m2 free unit surface) is an important design factor. For wastewater containing high solid contents, it is necessary to create sufficient retention time for predewatering of the skimmings. The PWL flotation systems have been designed for the nominal capacities with the solid contents up to 10.00 mg/l

Application

• Poultry processing, meat processing and packing;

• Poultry processing, meat processing and packing;

• Fish processing ;

• Mining industry;

• Petro-chemical industry;

• Pulp and paper industry;

• Textile industry;

• Tanneries, other industry;

Features

• Very compact modular construction

• Maximum pollution load reduction

• High dry solid contents of separating materials

• Easy operation

• Low maintenance costs

• Easy to expands to larger capacities

• Extremely competitive to comparable process

GA Drawing

» The Aeration systems can be either executed with

• A Multistage side chennel pump ->K1

• Air Saturation Vessel (K2)

» The Sludge Collection compartment is optional and can be replaced by

• A Discharge Chute

• A Spiral Conveyer Discharge for heavy sludges

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