Food Waste Treatment

Tuesday, September 1, 2015

Purpose of the project

Reducing and diverting waste ending up in landfill
The system produces biogas and bio-fertilizer for on-site renewable energy generation, therefore reducing Green House Gas emissions
The bio-fertilizer can be used for landscaping and shared among the community.

 

Approach

From 17 April to 17 June 2014, an anaerobic digestion system (COWTEC) was being trialed. Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen. The process produces:-
Biogas, and can be used directly as cooking fuel / convert it into power by using biogas genset converter / upgraded to natural gas-quality biomethane.

The nutrient-rich digestate and can be used as fertilizer.

 

Results

Based on the trialled result, Setia City Mall is expected to obtain 300 to 350kg of organic waste daily, approximately 9 to 10.5 tons of food waste per/month collected from selected F&B tenants. The machine provided a positive outcome when treating the organic waste in SCM:-
Biogas collection was large

Solid & liquid digestate output within 30 days was fully digested with PH levels of 7 to 7.5 (alkaline) to obtain a higher value as fertilizer to further improve the soil structure.

However, the cost to purchase/maintain the COWTEC machine does not justify the commercial returns. Therefore, the collected food waste was being diverted to an offsite BIO-Mate composting plant; 5km away from SCM, to convert food waste into animal feed.

 

“Lendlease has long term aspirations to eliminate waste with short term targets to reduce waste generation by 20% by 2020. Assets we manage contribute significantly to the waste our operations generate and it is important to engage with various stakeholders. With a vision to create the best places, Lendlease uses a truly collaborative approach, guiding our stakeholders beyond just maximizing value to innovative, sustainable outcomes. It is how we create a future built on sustainable practices and lasting relationships.”

- Michelle Lee, Head of Sustainability, Asia, Lendlease