Generating power from sewage

The sewage treatment plant in Burgebrach, Bavaria, demonstrates how a municipal enterprise can effectively reduce its energy and disposal costs with the help of a biogas plant. For the existing sewage treatment plant, which serves a population of 13 000, Weltec has added a sludge digestion unit including energetic utilisation of sewage gas in the combined heat and power (CHP) plant. The facilities went live in 2016. Since then, the sludge has been stabilised with an anaerobic process in the custom-designed stainless-steel tower following the wastewater treatment in a two-stage trickling filter unit.Thanks to the installation of the digestion unit, the unpleasant odour emissions around the sewage treatment plant have been eliminated. Moreover, the digestion reduces the amount of sludge and enables the energetic utilisation of the digestion gas. The operators also wanted to be able to use all the power and heat generated by the CHP plant for the on-site processes. Electricity savings of about 100 000 kWh/year are expected.

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