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Upgraded DAF system for Cedar Meats Cedar Meats is a meat exporter in Victoria with a continual improvement philosophy. The company needed to upgrade its dissolved air flotation (DAF) system but did not want to just go for a ‘standard’ system. It wanted a more energy-efficient system — one that could deliver low running costs for the life of the system. The ‘conventional’ system consists of a centrifugal pump that pulls clean effluent from the DAF tank and feeds it into a pressurised air saturation vessel. A compressor also feeds compressed

The system requires a control system

atmospheric air on the suction side of the

air into the same vessel and the air

to combine air and water needs, and it

pump. The pump sheers and mixes the

saturates into the effluent water. The

requires regular certification of the pressure

air with the water, and under pressure

water is then fed back into the bottom

vessel. There is also maintenance of the

from the multistage pump, air saturates

of the DAF tank where the air comes out

pump, compressor and pressure vessel to

into the effluent water. The water is

of solution to form tiny bubbles, which

consider, along with energy consumption of

then pumped into the bottom of the tank,

attach to fats and grease in the system

both pump and compressor. Capital costs

where the air comes out of solution, as in

and float it to the top of the tank where

and running costs are not cheap.

conventional systems. No compressor or

it is scraped away.

Cedar Meats Chief Engineer Yogesh Mistry

air saturation pressure vessel is needed.

went looking for a solution that did not involve

Mistry was impressed with the

intricate and delicate control systems and

simplicity of the system and promptly

did not need ongoing WorkSafe certification

arranged the purchase of an EDUR DAF

for pressure vessels. He contacted Hydro

pump. He has been pleased with the positive

Innovations to get information on the EDUR

results, which include: a higher rate of

DAF pump he had read about.

solids removed; less power used for the

EDUR, a German pump manufacturer,

job, reducing power costs; less complicated

has developed a multistage ‘multiphase’

controls; and a low-maintenance future

pump capable of handling a gas/water

ahead for the system.

mixture, making it ideal as a DAF pump.

20 Sustainability Matters - Aug/Sep 2017

The pump draws clean effluent from the

Hydro Innovations

DAF tank and, at the same time, draws in

www.hydroinnovations.com.au

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Sustainability Matters Aug/Sep 2017  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...

Sustainability Matters Aug/Sep 2017  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...