Coupling a microbial electrolysis cell to an anaerobic reactor to recover ammonia, upgrade biogas and stabilize the process
Faced with the many advantages of anaerobic digestion (AD),this technology has some limitations when treating high strength wastewater,such as those derived from livestock manure: i) high nutrient concentrations in effluents;ii) process instability against organic and nitrogen overloads,or the presence of inhibitors;and iii) the need for processing the biogas to increase its methane content for using it as renewable energy for certain uses,such as injection into the natural gas grid or being used as fuel for transport.Therefore,it is necessary to implement strategies to keep the AD process and effluent quality under control,and increase the amount of energy recovered in the system.Bioelectrochemical systems (BES) have the versatility to be combined with AD for its optimisation.The integration of AD and a microbial electrolysis cell (MEC) with an electromethanogenic biocathode at lab-scale is proposed here to increase the stability and robustness of the AD process under organic and nitrogen overloads.This combination keeps the effluent quality,while recovering ammonium,and upgrading the biogas produced.The bioanode compartment of the MEC was fed with the AD effluent,and a recirculation loop was established between both reactors to avoid AD inhibition phenomena after doubling the organic and nitrogen loading rate.The biocathode compartment of the MEC was feed with CO2 with dissolved bicarbonate simulating the CO2 from the biogas produced in the AD.Results confirmed the resilience of AD to high organic-nitrogen loading rates under combined AD-MEC configuration.Ammonium removal in the MEC anode compartment achieved 14.46 g N-NH4+ m-2 d-1,while an average of 79 L CH4 m-3 d-1 was obtained through the conversion of CO2 in the cathode compartment.
Electromethanogenesis biocathode anaerobic digestion ammonia recovery biogas upgrading
Míriam Cerrillo Marc Vi(n)as August Bonmatí
IRTA.GIRO Joint Research Unit IRTA-UPC.Torre Marimon.E-08140, Caldes de Montbui, Barcelona
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
623-626
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）