Understanding nitrogen recovery from wastewater with a high nitrogen concentration using microbial electrolysis cells

Abstract

This study was aimed at understanding the effect of applied voltage, catholyte and reactor scale on nitrogen recovery from two different organic wastes (digestate and pig slurry) by means of microbial electrolysis cell (MEC) technology. For this purpose, MEC sizes of 100, 500 and 1000 mL were tested at applied voltages of 0.6, 1 and 1.4 V using either a phosphate-buffered solution or NaCl solution as the catholyte. By increasing the reactor size from 500 to 1000 mL, a decrease in the ammonia recovery efficiency from 47 to 42% was observed. The results also showed that the phosphate-buffered solution is preferable as the catholyte and that the voltage applied does not have a noticeable effect on current production and ammonia recovery. Low biodegradability of the wastes was identified as the main bottleneck.

Keywords:

• Microbial electrolysis cell
• ammonia recovery
• high nitrogen concentration wastewater
• scaling up

Additional information

Funding

This research was supported by the European Union Horizon 2020 research and innovation program (grant no. 668128-Newfert-H2020-BBI-PPP-2014-1). M. I. San-Martín and R. Mateos are supported by a FPU fellowship grant (FPU13/04014 and FPU14/01573, respectively) from the Spanish Ministry of Economy and Competitiveness.