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Reduce your power bill with covered anaerobic lagoons According to Wiley Process Engineer

Optimising CAL systems

Heath Barker, “Organisations that are

Anaerobic systems are ‘living’ biological

not extracting maximum value from their

systems and must be nurtured. A well-

wastewater are losing out.”

balanced approach to anaerobic treatment

For example, biological wastewater

will not only increase the biogas yield, it will

treatment lagoons can be converted into

also reduce the organics left in the system.

CALs (covered anaerobic lagoons). These

“It is not uncommon to achieve a 90%

CAL systems are not only capable of

chemical oxygen demand reduction with

capturing biogas as a renewable energy

these anaerobic digestion systems,” stated

source, they can also reduce emissions.

Barker. This comes from an understanding

Basic systems can be a simple cover

of the waste stream and surrounding

over an existing lagoon that captures

environmental factors. It is important to

biogas which is then flared off. While this

not overload the system, ensuring peak

may reduce emissions, it misses out on

loads are identified and managed. “Installing a secondary anaerobic

In the future, Barker said, this

How CAL systems harness energy?

digestion (with a different type of

technology could be used for wider

By covering an existing anaerobic lagoon,

methanogenic bug) downstream can also

applications, so “we need to fine-tune the

the biogas released from that lagoon can

improve biogas yield and wastewater

systems to operate on a smaller footprint”.

be captured and converted into energy.

treatment,” said Barker

capturing energy.

Barker concluded by stating, “If there

Future gazing

are organics in your wastewater, you

rules and regulations for handling biogas,

The energy a CAL system produces can

need to turn this waste stream into a

and it can vary from state to state,” said

be enormous. For example, one of Barker’s

value stream.”

Barker. “But if you have the right people

recent projects at a rendering plant generates

Wiley & Co Pty Ltd

and the right approach, it can be easy.”

half a megawatt of power each day.

www.wiley.com.au

“It can be tricky dealing with all the

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Aug/Sep 2017 - Sustainability Matters 29

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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...