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Aerobic treatment of winery wastewater with the aim of water reuse
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Resumo(s)
An air micro-bubble bioreactor (AMBB) using a free self-adapted microbial population, 15dm3
working volume, was used for aerobic treatment of winery wastewater. This reactor utilizes
a Venturi injector in conjunction with mass transfer multiplier nozzles, which allow an efficient
oxygen transfer. The reactor can operate in batch or continuous conditions. The dynamics of
chemical oxygen demand (COD), biomass and total contents of polyphenolic compounds was
followed throughout each trial. The wastewater COD ranged between 4.0–8.0 kgCODm23
and the efficiency of the batch treatment was about 90.0 ^ 4.3%, after 6 days of operation.
The maximum efficiency obtained was achieved after 15 days of treatment (99%).
In continuous conditions, the loading rate and the treatment efficiency ranged between
0.45–1.00 kgCODm23 d21 and 93.3 ^ 2.0%, respectively. The AMBB hydraulic retention
time was 15 days. To assess the suitability of treated water in relation to vineyard irrigation,
the effluent was physico-chemical analysed and direct toxicity bioassays with effluent matrix
were carried out using Lepidium sativum L. seeds. The results showed the water quality required
to be reutilised minimizing water consumption. This study will contribute for the implementation
of an efficient water use plan, aiming the preservation of the water resource and the reduction
of the wastewater production
Descrição
Palavras-chave
aerobic biological treatment phytotoxicity water supply winery wastewater
Contexto Educativo
Citação
"Water Science & Technology". ISSN 0273-1223. 60 (2009) 1217-1223
Editora
IWA Publishing