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Pretreatment of coking wastewater using anaerobic sequencing batch reactor (ASBR)

  • Environment and Materials Engineering
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Abstract

A laboratory-scale anaerobic sequencing batch reactor (ASBR) was used to pretreat coking wastewater. Inoculated anaerobic granular biomass was acclimated for 225 d to the coking wastewater, and then the biochemical methane potential (BMP) of the coking wastewater in the acclimated granular biomass was measured. At the same time, some fundamental technological factors, such as the filling time and the reacting time ratio (tf/tr), the mixing intensity and the intermittent mixing mode, that affect anaerobic pretreatment of coking wastewater with ASBR, were evaluated through orthogonal tests. The COD removal efficiency reached 38%~50% in the stable operation period with the organic loading rate of 0.37~0.54 kg COD/(m3·d) at the optimum conditions oftf/tr, the mixing intensity and the intermittent mixing mode. In addition, the biodegradability of coking wastewater distinctly increased after the pretreatment using ASBR. At the end of the experiment, the microorganism forms on the granulated sludge in the ASBR were observed using SEM (scanning electron microscope) and fluoroscope. The results showed that the dominant microorganism on the granular sludge was Methanosaeta instead of Methanosarcina dominated on the inoculated sludge.

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Correspondence to Bing Li.

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Project (No. 40272108) supported by the National Natural Science Foundation of China

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Li, B., Sun, Yl. & Li, Yy. Pretreatment of coking wastewater using anaerobic sequencing batch reactor (ASBR). J Zheijang Univ Sci B 6, 1115–1123 (2005). https://doi.org/10.1631/jzus.2005.B1115

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  • DOI: https://doi.org/10.1631/jzus.2005.B1115

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