Water industry considers worth of co-digestion

Water firms are researching the benefits of co-digesting municipal and commercial food waste alongside sewage sludge

The water industry is investigating the potential for co-digestion of food waste with sewage sludge. But there are major hurdles to overcome to make it work.

The water industry produces about 1.6 million tonnes (dry weight) of sewage sludge a year, of which about two-thirds is treated in anaerobic digestion plants at sewage works (ENDS Report 404, pp 30-33). Both the government and water industry see a great opportunity to co-digest waste such as food scraps and farmyard manure alongside this sludge.

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