Partial Nitritation-Anammox Granules: Short-Term Inhibitory Effects of Seven Metals on Anammox Activity

Autor(es)

del Rio, Angeles Val ^[1] ; da Silva, Tulio ^[2] ; Martins, Tiago Henrique ^[2] ; Foresti, Eugenio ^[2] ; Campos, Jose Luis ^[3] ; Mendez, Ramon ^[1] ; Mosquera-Corral, Anuska ^[1]

Afiliação do(s) autor(es)

^[1] Univ Santiago de Compostela, Inst Technol, Dept Chem Engn, E-15782 Santiago De Compostela - Spain

^[2] Univ Sao Paulo, Sch Engn, Dept Hydraul & Sanitat, Sao Carlos, SP - Brazil

^[3] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Vina Del Mar - Chile

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 228, n. 11 NOV 10 2017.
• Citações Web of Science: 2

Resumo

The inhibitory effect of seven different metals on the specific anammox activity of granular biomass, collected from a single stage partial nitritation/anammox reactor, was evaluated. The concentration of each metal that led to a 50% inhibition concentration (IC50) was 19.3 mg Cu+2/L, 26.9 mg Cr+2/L, 45.6 mg Pb+2/L, 59.1 mg Zn+2/L, 69.2 mg Ni+2/L, 174.6 mg Cd+2/L, and 175.8 mg Mn+2/L. In experiments performed with granules mechanically disintegrated (flocculent-like sludge), the IC50 for Cd+2 corresponded to a concentration of 93.1 mg Cd+2/L. These results indicate that the granular structure might act as a physical barrier to protect anammox bacteria from toxics. Furthermore, the presence of an external layer of ammonia oxidizing bacteria seems to mitigate the inhibitory effect of the metals, as the values of IC50 obtained in this study for anammox activity were higher than those previously reported for anammox granules. Additionally, the results obtained confirmed that copper is one of the most inhibitory metals for anammox activity and revealed that chromium, scarcely studied yet, has a similar potential inhibitory effect. (AU)

• Processo FAPESP: 13/24189-5 - Inibição da atividade anammox específica por lixiviado
• Beneficiário: Túlio da Silva Siqueira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
• Processo FAPESP: 10/11218-9 - Alternativa tecnológica para o tratamento de lixiviados de aterro sanitário
• Beneficiário: Tiago Henrique Martins
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado