Abstract：
:Aquatic humic substance (AHS) in landfill leachate is resistant to biodegradation, especially in anaerobic habitats. However, we reported here for the first time that AHS was completely biodegraded with the anaerobic ammonium oxidation (Anammox) process. As a result of aromatic-ring cleavage and mineralization, carboxylic and aliphatic organics were significantly produced, the contents of chromophores such as quinoid and ketone were remarkably decreased to decolorize the leachate, and produced carbon dioxide along with increasing carbonate was clearly presented. Of the degraded AHS of 137 mg L(-1), 51 mg L(-1) was owed to the oxidation with sulfate of 76 mg L(-1) as electron acceptor, and the rest to other metabolic mechanism. Isolation and identification of heterotrophic bacteria revealed a diversified consortium comprising four facultative anaerobic species, Bacillus sp., Paenibacillus sp., Bacteroides sp. and Staphylococcus sp., without sulfate-reducing bacteria detected. Their contribution to AHS biodegradation and sulfate reduction under the special conditions with high oxidization-reduction potential and insufficient electron acceptors has not been known yet. Further work is underway to investigate their properties and respective duties in the consortium.
journal_name
Chemospherejournal_title
Chemosphereauthors
Liang Z,Liu JX,Li Jdoi
10.1016/j.chemosphere.2008.11.073subject
Has Abstractpub_date
2009-03-01 00:00:00pages
1315-20issue
10eissn
0045-6535issn
1879-1298pii
S0045-6535(08)01477-Xjournal_volume
74pub_type
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