Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/1658

TitlePost-treatment of a brewery wastewater using a sequencing batch reactor
Author(s)Rodrigues, A. C.
Brito, A. G.
Melo, L. F.
KeywordsSequencing batch reactor
Brewery wastewater
Anaerobic pretreatment
Nitrification
Denitrification
Protozoa
Issue dateJan-2001
PublisherThe Water Environment Federation (WEF)
JournalWater Environment Research
Citation"Water environmental research" ISSN 1061-4303. 73:1 (2001) 45-51.
Abstract(s)This study concerns the application of a sequencing batch reactor (SBR) for the posttreatment of an effluent rejected by an upflow anaerobic sludge blanket (UASB) reactor operating in a brewery. The goal was to achieve the required wastewater quality for discharge to surface water. The primary target was the removal of nitrogen compounds, but chemical oxygen demand and suspended solids were also concerns. Phosphorus concentration and protozoan population were also monitored during SBR operation. Two different strategies were tested: an operation based on an aerobic-anoxic sequence and another based on applying a predenitrification step, that is, an anoxic-aerobic-anoxic sequence. Ammonium (NH4-N) removal was achieved in all assays. Nitrification efficiency reached 97%, and the maximum observed rate was 0.175 kg NH4-N/kg volatile suspended solids.d. A denitrification process was detected during the aerated periods, despite a dissolved oxygen concentration in the bulk liquid of 2.8 to 3.7 mg O-2/L. However, denitrification was suppressed when the bulk liquid oxygen concentration was increased to 7 mg O-2/L. The carbon-to-nitrogen ratio of the UASB effluent was too low and hindered the postdenitrification phase. This fact was confirmed by complete nitrate removal when an acetate supplement was added. On the other hand, the insertion of a primary anoxic phase in the reaction cycle was the best treatment strategy, leading to nitrogen values within the legal framework. The protozoan population showed significant changes in response to the aerobic-anoxic conditions. However, periodic nonaerated conditions were not detrimental to aerobic protozoa, which recovered as soon as oxygen was again available.
TypeArticle
URIhttp://hdl.handle.net/1822/1658
ISSN1061-4303
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

Files in This Item:
File Description SizeFormat 
2001-26[1].pdf689,64 kBAdobe PDFView/Open

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID