Circular Economy: Waste water~ Where do I go?

Source: IWA-Network/ https://iwa-network.org/water-utility-pathways-circular-economy-charting-course-sustainability/

Urban areas like Sydney continue to expand and globally these areas account for 80% of GHG emissions. One of the biggest environmental challenges currently is the energy and water consumption. However, if cities apply the concept of circular economy (CE), urbanisation can reap the benefits of what the CE approach sows.

Denmark is one of the best examples for its action on circular economy. Waste water and organic waste have been looked as resources and been treated to produce clean and filtered water while its sludge is being sent to an energy converting facility. Usage of thermal hydrolysis process have been successful in converting the organic waste to organic fertiliser and also biogas inturn producing heat and electricity. This process grew interest and grabbed attention of many surrounding cities influencing their actions.

The ongoing pandemic has got the attention of sewage from the presence of viruses and the discussion on the chemicals existing in the sewage. Focus on micro pollutants as contaminants has been emerging in the wastewater industry. This awareness has been increasing due to the potential risks involved with these contaminants in sewage. Mix of micro plastics and other micro pollutants in the water made the industries rethink the design of infrastructure and strategies.

Currently, many business models have been developed in Australia to have an integrated closed loop for their products through CE approach. Investments are being made in innovation and technology to bring in infrastructure for maximum efficiency.

“In Australia, the water industry is already actively implementing opportunities including the recycling of biosolids, recycling wastewater for reuse and turning waste into energy, and using on-site renewable energy to address rising energy costs, reduce greenhouse gas emissions and meet renewable energy targets.”

The shift in thinking and being aware of these situations is the fundamental stepping stone needed to make a change. Recently, Australian Renewable Energy Agency (AARENA) invested in a large-scale facility for waste water treatment. Rather than landfilling, many options are being investigated to combat the micro pollutants and achieve circular economy.

Henceforth, A paradigm shift driven by innovation, awareness and responsibility will for sure bring change and address the environmental concerns.