Biological phosphate removal using a degradable carbon source produced by hydrothermal treatment of excess sludge

Brazilian Journal of Chemical Engineering

L. H. Haraguchi²  M. Fujita¹  H. Daimon¹  K. Fujie¹  R. S. Mohamed² 

[1],State University of Campinas School of Chemical Engineering Campinas São Paulo ,Brazil

关键词: COD Cr characterization enhanced biological phosphate removal (EBPR);    Excess sludge;    Hydrothermal reaction;    Readily biodegradable substrate;   

DOI  :  10.1590/S0104-66322006000100004

来源: SciELO

【 摘 要 】

The possibility of reusing excess sludge treated by hydrothermal reaction for the purpose of improving the efficiency of the enhanced biological phosphate removal (EBPR) process was investigated. Excess sludge from a fish-processing industry located in Japan was treated in high-temperature and high-pressure water, at a reaction temperature ranging from 200 to 400ºC, a pressure of 1.8 to 30MPa and a constant reaction time of 7 min. For the conditions tested, the results showed that when the reaction temperature was increased the content of readily biodegradable substrate in the total COD Cr increased. In addition, the amount of some volatile fatty acids (VFAs) produced by the hydrothermal reaction increased as reaction temperature increased. From the phosphate release tests under anaerobic conditions, it was possible to demonstrate that not only the VFAs, but also the readily and slowly biodegradable substrates are used as potential carbon source by the phosphate-accumulating organisms (PAOs).

【 授权许可】

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