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DP Seals has developed a long-life bubble bar component for the C and C Green Energy anaerobic digestion system.

The Galad system uses specially shaped tanks incorporating an inverted ‘V’-section aeration device with no moving parts that produces a gas curtain to stir the material being digested.

Gas at slightly above atmospheric pressure is pumped into the bubble bar at a variable flow rate; slits in the bar release the pressure as a bubble curtain that completely mixes the organic waste by setting up a controlled circulation pattern within the low-energy shaped tank.

The Galad system can treat a wide diversity of waste materials: domestic and industrial organic wastes, food-processing residues, agricultural slurries and energy crops – even abattoir offal waste.

DP Seals’ challenge was to find a material that would survive such an extremely aggressive environment inside the tank and provide the right sized bubbles for the mixing action.

After examining several alternatives, DP Seals suggested soft, high-strength silicone.

Silicone is one of the few rubber polymers resistant to such a diverse range of potential waste materials; selecting a soft variant ensured the slits in the moulding would open momentarily at the right time to produce good-sized bubbles capable of stirring the effluent.

Live trials carried out on a test rig installed at DP Seals proved the mouldings met C and C Green Energy requirements.

The tests showed the new bubble bar moulding produced a better bubble flow and survived the environment significantly longer than other materials.

Each bubble bar moulding incorporates a large number of gas-bubble-generating slits and is locked into a recyclable plastic extrusion.

The overall design ensures solids agitated by the mixing action cannot collect on the bubble bar.

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