Valuable product production from wood mill effluents
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Valuable product production from wood mill effluentsData
2010Cita bibliográfica
Mato T, Ben M, Kennes C, Veiga MC. Valuable product production from wood mill effluents. Water Science and Technology. 2010;62(10):2294-300
Resumo
Fibreboard production is one of the most important industrial activities in Galicia (Spain). Great amounts of wastewater are generated, with properties depending on the type of wood, treatment process, final product and water reusing, among others. These effluents are characterized by a high chemical oxygen demand (COD), low pH and nutrients limitation. Aerobic and anaerobic processes have been used for their treatment. Presently, bioplastics production (mainly polyhydroxyalkanoates or PHA) from wastewaters with mixed cultures is being studied. Substrate requirements for these processes are a high organic matter content and low nutrient concentration. Therefore, wood mill effluents could be a suitable feedstock. PHA production from wastewaters is carried out in three steps. First, complex organic matter is converted into volatile fatty acids (VFA) through acidogenic fermentation. Then, VFA are used as substrate in an aerobic sequencing batch reactor (SBR), in which the enrichement of PHA producing bacteria from a mixed culture is favoured. Finally, the sludge from the SBR is fed with a pulse containing high VFA concentrations, resulting in PHA accumulation inside the cells. In this work, the possibility of applying this process to wood mill effluents is proposed. An acidification percentage of 37% and a storage yield (YSTO) of 0.23 Cmmol/Cmmol were obtained.
Palabras chave
Acidogenic fermentation
Bioplastics
SBR
PHA
VFA
Wood mill effluent
Bioplastics
SBR
PHA
VFA
Wood mill effluent
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Dereitos
©IWA Publishing 2010. The definitive peer-reviewed and edited version of this article is published in Water Science & Technology, Vol 62 No 10 pp 2294–2300, 2010,doi:10.2166/wst.2010.949 and is available at www.iwapublishing.com.