期刊
BIORESOURCE TECHNOLOGY
卷 107, 期 -, 页码 110-115出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.12.038
关键词
Struvite; Microbial electrolysis cell; Phosphate removal; Microbial electrochemical systems
资金
- King Abdullah University of Science and Technology (KAUST) [KUS-I1-003-13]
An energy efficient method of concurrent hydrogen gas and struvite (MgNH4PO4 center dot 6H(2)O) production was investigated based on bioelectrochemically driven struvite crystallization at the cathode of a single chamber microbial electrolysis struvite-precipitation cell (MESC). The MESC cathodes were either stainless steel 304 mesh or fiat plates. Phosphate removal ranged from 20% to 40%, with higher removals obtained using mesh cathodes than with flat plates. Cathode accumulated crystals were verified as struvite using a scanning electron microscope capable of energy dispersive spectroscopy (SEM-EDS). Crystal accumulation did not affect the rate of hydrogen production in struvite reactors. The rate of struvite crystallization (g/m(2)-h) and hydrogen production (m(3)/m(3)-d) were shown to be dependent on applied voltage and cathode material. Overall energy efficiencies (substrate and electricity) were high (73 +/- 4%) and not dependent on applied voltage. These results show that MESCs may be useful both as a method for hydrogen gas and struvite production. (C) 2011 Elsevier Ltd. All rights reserved.
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