Electrochemical Resource Recovery from Digestate to Prevent Ammonia Toxicity during Anaerobic Digestion

被引:173
作者
Desloover, Joachim [1 ]
Woldeyohannis, Andualem Abate [1 ]
Verstraete, Willy [1 ]
Boon, Nico [1 ]
Rabaey, Korneel [1 ,2 ]
机构
[1] Univ Ghent, Lab Microbial Ecol & Technol LabMET, B-9000 Ghent, Belgium
[2] Univ Queensland, Adv Water Management Ctr, Brisbane, Qld 4072, Australia
关键词
MICROBIAL FUEL-CELL; BIOELECTROCHEMICAL SYSTEMS; EXCHANGE MEMBRANES; SWINE MANURE; WASTE-WATER; REMOVAL; ELECTRODIALYSIS; INHIBITION; GENERATION; TRANSPORT;
D O I
10.1021/es3028154
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ammonia inhibition during anaerobic digestion limits the substrate loading rate and endangers process stability. Furthermore, digestates are interesting feedstocks for nutrient recovery. In this lab-scale study, an electrochemical cell was used to investigate the NH4+ flux from anode to cathode. Under optimal conditions with synthetic wastewater, an NH4+ charge transfer efficiency of 96% and NH4+ flux of 120 g N m(-2) d(-1) could be obtained at a concomitant electricity input of 5 kWh kg(-1) N removed. A more selective NH4+ transfer could be established by maintaining a high concentration of other cations in the cathode compartment. Comparable NH4+ fluxes could be obtained with digestate at an electrical power input of 13 kWh kg(-1) N removed and 41% current efficiency. The ammonium level in the digestate could be lowered from 2.1 to 0.8 - 1.2 g N L-1. Interestingly, also potassium fluxes of up to 241 g K+ m(-2) d(-1) could be obtained at 23% current efficiency. As the cathode can be operated at high pH without the need for chemical addition, stripping and absorption of dissolved ammonia could reach 100% efficiency. By valorization of the generated side products, this technology shows economic potential for practical application.
引用
收藏
页码:12209 / 12216
页数:8
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