Simultaneous nitrification-denitrification (SND) using a thermoplastic gel as support: pollutants removal and microbial community in a pilot-scale biofilm membrane bioreactor

Autor(es)

Salcedo Moyano, Alvaro Javier ^[1] ; Delforno, Tiago Palladino ^[2] ; Subtil, Eduardo Lucas ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC UFABC, Engn Modeling & Appl Social Sci Ctr CECS, 5001 Av Estados, BR-09210580 Santo Andre, SP - Brazil

^[2] Campinas Univ UNICAMP, Res Ctr Chem Biol & Agr CPQBA, Microbial Resources Div, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL TECHNOLOGY; JUL 2021.
• Citações Web of Science: 3

Resumo

In this study, experiments were carried out to treat sanitary wastewater in a biofilm membrane bioreactor using a thermoplastic gel as a support to assist the nitrification-denitrification process. For this purpose, the system was operated in two different dissolved oxygen concentrations (2.3 +/- 0.2 and 0.9 +/- 0.3 mg O-2/L for Phases I and II, respectively) and the removal of organic compounds and nitrogen, as well as the microbial community in suspended biomass and biofilm were evaluated. The MB-MBR system was able to withstand raw wastewater variations and maintaining a low permeate COD concentration (18 mg/L) even at low DO concentrations. On the other hand, it was found that oxygen concentration significantly influenced the process of nitrogen conversion. In Phase I the average removal of total nitrogen was 18 +/- 8%, while in Phase II it increased to 66 +/- 11%. The denitrification rate was two times higher (7.8 mg NO3--N/h) at low dissolved oxygen, with a significant contribution of the biofilm (41%). Additionally, the high-throughput 16S rDNA sequencing showed that the oxygen concentration was determinant for arrangement patterns of the samples and not the sampling site (suspended biomass and support material). Thiothrix, Comamonas, Rhodobacter, Mycobacterium, Thermomonas, Sphingobium, Sphigopyxis, Pseudoxanthomonas, Nitrospira and, Novosphingobium were the main genera regarding the nitrogen cycle. {[}GRAPHICS] (AU)

• Processo FAPESP: 16/23684-0 - Uma nova abordagem para o tratamento de esgoto e recuperação de água e energia: desenvolvimento de um biorreator eletroquímico com membranas condutivas (BREMc) operado em condição de nitrificação e desnitrificação simultânea (NDS)
• Beneficiário: Eduardo Lucas Subtil
• Modalidade de apoio: Auxílio à Pesquisa - Regular