Enhanced anaerobic digestion of waste activated sludge of low organic content in a novel digester

Abstract : A novel digester, termed an internal circulation anaerobic digester (ICAD), was developed to intensify sludge digestion. It consists of reaction zone, settling zone, thickening zone, riser and downcomer. Internal circulation in the digester is intensified by backflow biogas. The mesophilic ICAD treating thermal pretreated waste activated sludge with volatile suspended solids (VSS)/suspended solids (SS) of 0.45-0.49 was conducted in this study to reduce and stabilize the low organic content sludge. The results showed that the VSS removal rate and biogas rate reached 46.0% and 0.72 m(3)/kg VSSfed at hydraulic retention time (HRT) of 15 days. VSS/SS and soluble chemical oxygen demand (SCOD) of the effluent sludge ranged from 0.39 to 0.41 and 274 mg/L to 473 mg/L, respectively, under various HRTs from 10 to 27 days. The degradation ability of ICAD derived from the improved mass transfer by internal circulation and long solid retention time at short HRT is compared with continuous stirred tank reactor.
Type de document :
Article dans une revue
Water Science and Technology, IWA Publishing, 2015, 72 (6), pp.966-973. 〈10.2166/wst.2015.296〉
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https://hal.univ-lorraine.fr/hal-01270992
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Soumis le : lundi 8 février 2016 - 16:46:22
Dernière modification le : vendredi 15 juin 2018 - 11:22:03

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J. Wu, Y. Jiang, Z. P. Cao, Zheng-Hui Li, Y. Y. Hu, et al.. Enhanced anaerobic digestion of waste activated sludge of low organic content in a novel digester. Water Science and Technology, IWA Publishing, 2015, 72 (6), pp.966-973. 〈10.2166/wst.2015.296〉. 〈hal-01270992〉

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