Simultaneous removal of TOC and TSS in swine wastewater using the partial nitritation process

Abstract

BACKGROUND: Considering biological nitrogen removal, the partial nitritation connected with the anaerobic ammonium oxidation (anammox) process is a promising alternative for nitrogen elimination at high loading rates. The objective of the present study was to evaluate the establishment and operation of a partial nitritation process in an airlift reactor with simultaneous removal of total organic carbon and suspended solids using swine wastewater.RESULTS: The partial nitritation reactor was inoculated with a nitrifying sludge at 2.1 gTSS L−1 and fed with an UASB reactor effluent. High organic carbon loading rates, above 2 kgTOC m−3 d−1 have been shown to be potential inhibitors of the partial nitritation process due to competition between autotrophic and heterotrophic bacteria. In this study, the partial nitritation process was established using undiluted swine wastewater, with HRT of 24 h, 1.84 mgO2 L−1 (SD = 0.41) DO, loading rate of 1.14 gTOC L−1 d−1 and 0.91 gN‐NH3 L−1 d−1 for more than 100 consecutive days. At the same time, the system proved to be an effective tool in TOC and TSS removal, reaching 84.9% (SD = 9.3) and 83.1% (SD = 0.1), respectively.CONCLUSION: This result enhances partial nitritation application as a technology for high load nitrogen converting, and allows the possibility of connection with anammox reactors. Copyright © 2012 Society of Chemical Industry

Simultaneous removal of nitrogen and organic carbon from swine wastewater using the pre-denitrification/nitrification process

“…Interestingly, the observed acclimation period was much shorter than the 100 to 175 days (Jubany et al, 2008) reported for other nitrification systems treating swine wastewater. The rapid acclimation time obtained in this study was most likely due to the use of a diluted raw effluent (1:10 v/v), which minimizes the inhibitory effects of high influent NH3 concentrations on microorganisms (De Prá et al, 2012). Therefore, the use of a diluted wastewater influent during the initial MLE start up process could minimize time required to establish steady-state conditions at field-scale operations.…”

O Processo da Biodigestão - Capítulo I

“…A fermentação de materiais ricos em ureia e proteínas libera amônia. Em função do pH e temperatura do meio reacional, pode-se ter uma geração elevada de amônia livre (De Prá et al 2013). O equilíbrio químico do sistema para formação de amônia livre (AL) pode ser calculado através da Equação 2.…”

Fundamentos da digestão anaeróbia, purificação do biogás, uso e tratamento do digestato

“…Dentre as alternativas para favorecer o acúmulo de nitrito nos sistemas biológicos, as principais se baseiam na regulação apropriada de parâmetros de controle como oxigênio dissolvido (OD), tempo de aeração, temperatura, tempo de retenção hidráulica (TRH), tempo de retenção de sólidos (TRS), pH, amônia livre (AL), ácido nitroso livre (ANL) e inibidores químicos (Cui, 2012;De Prá, 2013). Contudo, é necessário avaliar, além das vantagens e limitações, a viabilidade econômica do processo quando da utilização destas estratégias.…”