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Biomethanization of nitrogen rich agricultural and urban wastewaters: biological kinetics and managemet optimization using sequencing batch reactors
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Autores
Resumo(s)
The need of a closed loop economy strategy implying a total resources conservation policy may be the main challenge human communities will face in the near future considering livelihood sustainability and climate vulnerability. Therefore, energy and materials recovery technologies associated to the large amount of organic waste generated by anthropogenic activities, which still need proper treatment due to their impact on the environment, are mandatory as societal priority. This thesis addresses this challenge in the agricultural sector, more specifically on cattle manure waste management, crossing this issue with urban sewage sludge treatment in anaerobic co-digestion processes. The goal was to optimize the biomethanization process of agricultural effluents and sewage sludge, overcoming unbalances in the anaerobic co-digestion kinetics, providing indicators for the location of biogas production facilities. The study comprised a set of integrated specific objectives, namely i) to increase the substrates biodegradability in anaerobic co-digestion processes, ii) to achieve the appropriate inoculum to substrate ratio, iii) to assess ultrasound and struvite precipitation pretreatments in raw substrates and iv) to define a spatial GIS-based analysis for facilities location in such context of energy and nutrients recovery. The results revealed sonication as a promising auxiliary technology for energy effectiveness. The optimization of the anaerobic co-digestion process was conducted to reduce biological inhibition constraints related to carbon to nitrogen ratio unbalance and to facilitate further energy recovery from anaerobic co-digestion process. Thus, an optimized performance in terms of methane production using ultrasound pretreatment processes and struvite precipitation, as well as the combination of both processes, was achieved. Finally, the previous studies allowed the knowledge for the development of a specific resources allocation methodology for the location of biogas production units
Descrição
Doutoramento em Engenharia do Ambiente / Instituto Superior de Agronomia. Universidade de Lisboa
Palavras-chave
agricultural residues nutrients recovery struvite precipitation ultrasound solubilization spatial models co-digestion biomethanization inoculum to substrate ratio biogas production methane yield
Contexto Educativo
Citação
Coura, R.D. - Biomethanization of nitrogen rich agricultural and urban wastewaters: biological kinetics and managemet optimization using sequencing batch reactors. Lisboa: ISA, 2021, 145 p.