Is the naphthalene sulfonate H-acid biodegradable in mixed microbial cultures under aerobic conditions?

Olmez-Hanci T., Arslan-Alaton I., ORHON D., Karahan Ö., Çokgör E., Insel G.

BIORESOURCE TECHNOLOGY, vol.102, no.10, pp.5589-5595, 2011 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 102 Issue: 10
  • Publication Date: 2011
  • Doi Number: 10.1016/j.biortech.2011.01.086
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.5589-5595
  • Istanbul Technical University Affiliated: Yes


Synthetically prepared wastewater originating from the H-acid (4-Amino-5-hydroxy-2,7-naphthalene disulfonic acid) manufacturing process was subjected to respirometric analysis for evaluating the level of achievable biodegradation in the presence of this commercially important azo dye precursor. For this purpose, H-acid was mixed with synthetic substrate having the same characteristics as sewage at a concentration and composition being typical for H-acid manufacturing wastewater. Experimental results indicated that H-acid was not biodegradable under activated sludge treatment conditions even after prolonged acclimation periods. The results were also confirmed by model evaluation of oxygen uptake rate profiles. H-acid also did not inhibit the biodegradation of synthetic sewage but accumulated as soluble inert COD in the treated wastewater. (C) 2011 Elsevier Ltd. All rights reserved.