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How to maximize the value of anaerobic digestion

Heating, pasteurization and concentration technologies can optimize the anaerobic digestion process to benefit the manufacturer and the planet.

To maximize the value of anaerobic digestion, food and beverage manufacturers need to incorporate innovative heating, pasteurization and concentration technologies that optimize their anaerobic digestion processes. Photo courtesy of HRS Heat Exchangers.
To maximize the value of anaerobic digestion, food and beverage manufacturers need to incorporate innovative heating, pasteurization and concentration technologies that optimize their anaerobic digestion processes. Photo courtesy of HRS Heat Exchangers.

More food and beverage processors are adding anaerobic digestion operations to their manufacturing plants to combat the growing problem of food waste while saving on energy costs. But to maximize the ROI of anaerobic digestion, food and beverage manufacturers need to incorporate innovative heating, pasteurization and concentration technologies that optimize the process.

According to the USDA Economic Research Service, up to 63 million tons of food is wasted across the U.S. supply chain every year. But many food and beverage processors are mitigating that waste by using anaerobic digestion, a series of biological processes in which microorganisms break down biodegradable material in the absence of oxygen. Processing organic wastes through anaerobic digestion not only cuts greenhouse gas emissions by diverting waste from landfills, it generates homegrown renewable energy and produces a biofertilizer (digestate), rich in valuable nutrients, such as nitrogen, potassium and phosphorous. Manufacturers can sell that biofertilizer to farmers, growers and even gardeners, bringing in extra revenue.

Efficient digestate pasteurization

Pasteurization is crucial to sell digestate from food waste digestion. Many countries have legal requirements around pasteurizing digestate in order to reassure farmers, growers and legislators that it is safe to apply to land.

Matt Hale, international sales and marketing director for United Kingdom-based HRS Heat Exchangers, recommends using a heating and pasteurization system like the 3 Tank Batch Sludge Pasteurizer System from HRS Heat Exchangers that works on a three-tank principle, which can cut energy costs up to 70 percent. With a three-tank system, one tank is being filled, while the second tank holds the digestate above 158°F. At the same time, the third tank is being emptied. Each process lasts an hour.

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