期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 9, 页码 8860-8867出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00867
关键词
bioelectrochemical; phosphate removal; local high pH; amorphous calcium phosphate; energy consumption
资金
- Ministry of Infrastructure and Environment
- European Union Regional Development Fund
- Province of Fryslan
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [665874]
- research theme Resource Recovery
- Dutch Ministry of Economic Affairs
Phosphorus (P) removal and recovery from waste streams is essential for a sustainable world. Here, we updated a previously developed abiotic electrochemical P recovery system to a bioelectrochemical system. The anode was inoculated with electroactive bacteria (electricigens) which are capable of oxidizing soluble organic substrates and releasing electrons. These electrons are then used for the reduction of water at the cathode, resulting in an increase of pH close to the cathode. Hence, phosphate can be removed with coexisting calcium ions as calcium phosphate at the surface of the cathode with a much lower energy input. Depending on the available substrate (sodium acetate) concentration, an average current density from 1.1 +/- 0.1 to 6.6 +/- 0.4 A/m(2) was achieved. This resulted in a P removal of 20.1 +/- 1.5% to 73.9 +/- 3.7%, a Ca removal of 10.5 +/- 0.6% to 44.3 +/- 1.7% and a Mg removal of 2.7 +/- 1.9% to 16.3 +/- 3.0%. The specific energy consumption and the purity of the solids were limited by the relative low P concentration (0.23 mM) in the domestic wastewater. The relative abundance of calcium phosphate in the recovered product increased from 23% to 66% and the energy consumption for recovery was decreased from 224 +/- 7 kWh/kg P to just 56 +/- 6 kWh/kg P when treating wastewater with higher P concentration (0.76 mM). An even lower energy demand of 21 +/- 2 kWh/kg P was obtained with a platinized cathode. This highlights the promising potential of bioelectrochemical P recovery from P-rich waste streams.
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