Water Science & Technology Vol 42 No 5-6 pp 363–370 © IWA Publishing 2000
Methanogenic biodegradation of aromatic amines
S Kalyuzhnyi*, V Sklyar**, T Mosolova***, I Kucherenko****, J.a Russkova***** and N Degtyaryova******
*
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
**
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
***
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
****
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
*****
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
******
Department of Chemical Enzymology, Chemistry Faculty,
Moscow State University, 119899 Moscow, Russia
(E-mail:svk@enzyme.chem.msu.ru)
ABSTRACT
Batch methanogenic toxicity and biodegradability of 2-, 3- and
4-aminobenzoic acids (ABA) as well as 4- and 5-aminosalicylic acids
(ASA) have been studied in the presence of two mesophilic (Shell and
cattle) and one thermophilic sludges. The aminoaromatics tested
practically did not inhibit methanogenesis up to concentrations of
3–7 g/l; moreover, some of them (2-ABA, 4-ABA and 5-ASA) even exert
a stimulating effect on aceticlastic activity of the sludges.
Concerning biodegradability, 5-ASA was completely mineralised by all
the sludges tested; however, 4-ASA was not degraded at all by any of
the sludges. Both mesophilic sludges were able to perform a complete
mineralization of 2-ABA but this was not a case for the thermophilic
sludge. 3-ABA was not biodegraded only in the presence of the Shell
sludge. On the contrary, 4-ABA was quantitatively mineralised only by
the Shell sludge. All the adapted sludges were able to mineralise the
corresponding aminoaromatics in N-deprived media. Cross-acclimatisationtrials showed that 2-ABA-, 5-ASA- and salicylic acid adapted sludges
were unable to degrade any other aminoaromatics tested that manifest
about a different nature of key bacteria responsible for primary
decomposition of these substrates. The main possibility of continuous
mineralization of 2-ABA as a unique source of carbon and nitrogen has
been demonstrated using mesophilic UASB reactor inoculated by adapted sludge.
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