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https://hdl.handle.net/1822/70363
Título: | Combined pretreatment by ultrasound and struvite precipitation of raw substrates: a strategy to overcome C/N ratio unbalance in nitrogen-rich anaerobic co-digestion systems |
Autor(es): | Coura, Renata D'arc Rodrigues, Ana Cristina Costa Alonso, Joaquim Mamede Ferraz, Ana Isabel Brito, Luis Miguel Abrantes, João Carlos de Castro Guerreiro Brito, António |
Palavras-chave: | Ultrasound pretreatment Struvite precipitation Nutrient recovery Circular economy Anaerobic (co)digestion |
Data: | 2021 |
Editora: | MDPI |
Revista: | Sustainability (MDPI) |
Citação: | Coura, Renata Darc; Rodrigues, A. C.; Alonso, Joaquim Mamede; Ferraz, Ana; Brito, Luis Miguel; Abrantes, João Carlos de Castro; Guerreiro Brito, António, Combined pretreatment by ultrasound and struvite precipitation of raw substrates: a strategy to overcome C/N ratio unbalance in nitrogen-rich anaerobic co-digestion systems. Sustainability, 13(4), 2175, 2021 |
Resumo(s): | The present study aimed to optimize the struvite chemical precipitation process in nitrogen-rich anaerobic co-digestion systems. Struvite precipitation experiments were carried out using a mixture of cattle slurry liquid fraction and sewage sludge, with and without ultrasound pretreatment. Marine salt or MgCl2 were used as magnesium source in NH4+:Mg2+ stoichiometric proportions of 1:1.5 and 1:3. Under the tested conditions, ammonium nitrogen and orthophosphate were removed from the mixed liquor with a maximum observed efficiency of 43% and 92%, respectively, when the ultrasound treatment was applied prior to struvite precipitation, using MgCl2 as source of magnesium (NH4+:Mg2+ of 1:3). The operating time was 40 min. Different pretreatments were tested prior to the biomethanization experiments, struvite precipitation, ultrasound, or a combination of both pretreatments. The application of ultrasound (with an energy input of 218 kJ L?1) and struvite precipitation (NH4+:Mg2+ of 1:3) increased the methane content in the biogas by 82% and reduced hydraulic retention time by 28%, when compared to the anaerobic co-digestion assays without pretreatment. The hydrolytic pretreatment increased the bioavailability of nitrogen by 5%, thus enhancing the removal efficiency of ammonium nitrogen by 20%. Consequently, an increase in the carbon to nitrogen ratio was observed, favoring the methanogenesis process. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/70363 |
DOI: | 10.3390/su13042175 |
ISSN: | 2071-1050 |
Versão da editora: | https://www.mdpi.com/journal/sustainability |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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document_54215_1.pdf | 1,01 MB | Adobe PDF | Ver/Abrir |