Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/1963
Título: Toxicity reduction and biodegradability enhancement of cork processing wastewaters by ozonation
Autor: Gomes, Arlindo Caniço
Silva, Maria Lúcia Almeida da
Simões, Rogério Manuel dos Santos
Canto, N.
Albuquerque, António
Palavras-chave: Biodegradability
Cork wastewater
Cortiça
Tratamento de águas residuais
Ozonation
Toxicity
Data: Out-2013
Editora: IWA
Resumo: Biodegradability enhancement and detoxification of cork boiling wastewater (CBW) are required for the successful implementation of biological treatment options. We studied the possibility of achieving these goals through ozonation pre-treatment by experimenting on the effect of ozone dose and pH. The CBW used had a pH of 5.81, a chemical oxygen demand (COD) of 1,865 mg L-1, a biochemical oxygen demand (BOD5) of 498 mg L-1 and total phenol (TP) and tannin compounds concentrations of 523 and 399 mg L-1, respectively. The ozone doses ranged from 0.27 to 2.63 for the O-3(applied)/COD0 ratios with samples at natural pH and set to 3.33 and 9.96. Ozonation allowed the BOD20/COD ratio (biodegradability index) to increase from 0.37 to 0.63 and a toxicity reduction from 3.08 to 1.24 TU (Microtox). The corresponding removals obtained were 15.2-62.0%, 38.4-83.2% and 56.7-92.1% for COD, TP and colour, respectively. The best outcome of ozonation pre-treatment requires O-3(applied)/COD0 ratios over 1.5 and an acid pH. The increase of TP removals with ozone dose at acid pH led to biodegradability enhancement and CBW detoxification. However, for similar conditions the highest COD removals were obtained at alkaline pH due to the hydroxyl radicals' high oxidation ability but lack of selectivity.
Peer review: yes
URI: http://hdl.handle.net/10400.6/1963
ISSN: 1996-9732
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