Ammonia removal in food waste anaerobic digestion using a side-stream stripping process

作者：Serna Maza A^*; Heaven S; Banks C J

来源：Bioresource Technology, 2014, 152: 307-315.

DOI：10.1016/j.biortech.2013.10.093

• Ammonia removal
• Side-stream stripping
• Anaerobic digestion
• Food waste

Three 35-L anaerobic digesters fed on source segregated food waste were coupled to side-stream ammonia stripping columns and operated semi-continuously over 300 days, with results in terms of performance and stability compared to those of a control digester without stripping. Biogas was used as the stripping medium, and the columns were operated under different conditions of temperature (55, 70, 85 degrees C), pH (unadjusted and pH 10), and RT (2-5 days). To reduce digester TAN concentrations to a useful level a high temperature (>= 70 degrees C) and a pH of 10 were needed; under these conditions 48% of the TAN was removed over a 138-day period without any detrimental effects on digester performance. Other effects of the stripping process were an overall reduction in digestate organic nitrogen-containing fraction compared to the control and a recovery in the acetoclastic pathway when TAN concentration was 1770 +/- 20 mg kg (1).

• 出版日期2014-1