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Electrochemical struvite precipitation from digestate with a fluidized bed cathode microbial electrolysis cell.
Water Res. 2014 May 01; 54:297-306.WR

Abstract

Microbial electrolysis cells (MECs) can be used to simultaneously convert wastewater organics to hydrogen and precipitate struvite, but scale formation at the cathode surface can block catalytic active sites and limit extended operation. To promote bulk phase struvite precipitation and minimize cathode scaling, a two-chamber MEC was designed with a fluidized bed to produce suspended particles and inhibit scale formation on the cathode surface. MEC operation elevated the cathode pH to between 8.3 and 8.7 under continuous flow conditions. Soluble phosphorus removal using digester effluent ranged from 70 to 85% with current generation, compared to 10-20% for the control (open circuit conditions). At low current densities (≤2 mA/m(2)), scouring of the cathode by fluidized particles prevented scale accumulation over a period of 8 days. There was nearly identical removal of soluble phosphorus and magnesium from solution, and an equimolar composition in the collected solids, supporting phosphorus removal by struvite formation. At an applied voltage of 1.0 V, energy consumption from the power supply and pumping (0.2 Wh/L, 7.5 Wh/g-P) was significantly less than that needed by other struvite formation methods based on pH adjustment such as aeration and NaOH addition. In the anode chamber, current generation led to COD oxidation (1.1-2.1 g-COD/L-d) and ammonium removal (7-12 mM) from digestate amended with 1 g/L of sodium acetate. These results indicate that a fluidized bed cathode MEC is a promising method of sustainable electrochemical nutrient and energy recovery method for nutrient rich wastewaters.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA. Electronic address: rcusick@illinois.edu.Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24583521

Citation

Cusick, Roland D., et al. "Electrochemical Struvite Precipitation From Digestate With a Fluidized Bed Cathode Microbial Electrolysis Cell." Water Research, vol. 54, 2014, pp. 297-306.
Cusick RD, Ullery ML, Dempsey BA, et al. Electrochemical struvite precipitation from digestate with a fluidized bed cathode microbial electrolysis cell. Water Res. 2014;54:297-306.
Cusick, R. D., Ullery, M. L., Dempsey, B. A., & Logan, B. E. (2014). Electrochemical struvite precipitation from digestate with a fluidized bed cathode microbial electrolysis cell. Water Research, 54, 297-306. https://doi.org/10.1016/j.watres.2014.01.051
Cusick RD, et al. Electrochemical Struvite Precipitation From Digestate With a Fluidized Bed Cathode Microbial Electrolysis Cell. Water Res. 2014 May 1;54:297-306. PubMed PMID: 24583521.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrochemical struvite precipitation from digestate with a fluidized bed cathode microbial electrolysis cell. AU - Cusick,Roland D, AU - Ullery,Mark L, AU - Dempsey,Brian A, AU - Logan,Bruce E, Y1 - 2014/02/06/ PY - 2013/09/30/received PY - 2014/01/16/revised PY - 2014/01/25/accepted PY - 2014/3/4/entrez PY - 2014/3/4/pubmed PY - 2014/11/5/medline KW - Bio-electrochemical fluidized bed reactor KW - Electrochemical phosphorus recovery KW - Microbial electrolysis cell KW - Struvite SP - 297 EP - 306 JF - Water research JO - Water Res. VL - 54 N2 - Microbial electrolysis cells (MECs) can be used to simultaneously convert wastewater organics to hydrogen and precipitate struvite, but scale formation at the cathode surface can block catalytic active sites and limit extended operation. To promote bulk phase struvite precipitation and minimize cathode scaling, a two-chamber MEC was designed with a fluidized bed to produce suspended particles and inhibit scale formation on the cathode surface. MEC operation elevated the cathode pH to between 8.3 and 8.7 under continuous flow conditions. Soluble phosphorus removal using digester effluent ranged from 70 to 85% with current generation, compared to 10-20% for the control (open circuit conditions). At low current densities (≤2 mA/m(2)), scouring of the cathode by fluidized particles prevented scale accumulation over a period of 8 days. There was nearly identical removal of soluble phosphorus and magnesium from solution, and an equimolar composition in the collected solids, supporting phosphorus removal by struvite formation. At an applied voltage of 1.0 V, energy consumption from the power supply and pumping (0.2 Wh/L, 7.5 Wh/g-P) was significantly less than that needed by other struvite formation methods based on pH adjustment such as aeration and NaOH addition. In the anode chamber, current generation led to COD oxidation (1.1-2.1 g-COD/L-d) and ammonium removal (7-12 mM) from digestate amended with 1 g/L of sodium acetate. These results indicate that a fluidized bed cathode MEC is a promising method of sustainable electrochemical nutrient and energy recovery method for nutrient rich wastewaters. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/24583521/Electrochemical_struvite_precipitation_from_digestate_with_a_fluidized_bed_cathode_microbial_electrolysis_cell_ DB - PRIME DP - Unbound Medicine ER -