Record nummer 2280818
Titel artikel Adaptation of semi-continuous anaerobic sludge digestion to humic acids
Auteur(s) Li, J. ; Hao, X. ; Loosdrecht, M.C.M. van ; Yu, J. ; Liu, R.
Tijdschrifttitel Water research : the journal of the International Association on Water Quality
Deel(Jaar)Nummer (2019)161
Paginering 329 - 334
Online full text
Publicatie type Artikel
Taal Engels
Toelichting (Engels) Anaerobic digestion (AD) is a technology for recovering chemical energy as methane from excess sludge/ waste. Unfortunately, humic acids (HA) contained in excess sludge can have the effects of inhibiting the efficiency of energy conversion. Based on a batch experiment, the impact of HA on a semi-continuous AD process was sequentially investigated, with the impact on the associated enzymes and microorganisms being measured. The results of this semi-continuous experiment indicate that the inhibition of the microbial community increased with an increased HA:VSS ratio. Long-term cultivation did not result in the adaption of methane production to the presence of HA. Moreover, at HA:VSS = 20%, the strongest inhibition (74.3%) on energy conversion efficiency was observed in the semi-continuous experiment, which was two-fold higher than that recorded in the batch experiment. This is attributed to serious and irreversible inhibition of both acidogenic and methanogenic microorganisms, as well as the physicalchemical reactions between HA and the associated enzymes which, it was concluded, were the dominant mechanisms of inhibition in the batch experiment.
Betrokken instanties Technische Universiteit Delft
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