Abstract

Dimethyl phthalate (DMP), an important industrial raw material, is an endocrine disruptor of concern for human and environmental health. DMP exhibits slow biodegradation, and its coupled treatment by means of advanced oxidation may enhance its biotransformation and mineralization. We evaluated two ways of coupling UV–H2O2 advanced oxidation to biodegradation: sequential coupling and intimate coupling in an internal circulation baffled biofilm reactor (ICBBR). During sequential coupling, UV–H2O2 pretreatment generated carboxylic acids that depressed the pH, and subsequent biodegradation generated phthalic acid; both factors inhibited DMP biodegradation. During intimately coupled UV–H2O2 with biodegradation, carboxylic acids and phthalic acid (PA) did not accumulate, and the biodegradation rate was 13 % faster than with biodegradation alone and 78 % faster than with biodegradation after UV–H2O2 pretreatment. Similarly, DMP oxidation with intimate coupling increased by 5 and 39 %, respectively, compared with biodegradation alone and sequential coupling. The enhancement effects during intimate coupling can be attributed to the rapid catabolism of carboxylic acids, which generated intracellular electron carriers that directly accelerated di-oxygenation of PA and relieved the inhibition effect of PA and low pH. Thus, intimate coupling optimized the impacts of energy input from UV irradiation used together with biodegradation.

Original languageEnglish (US)
Pages (from-to)431-441
Number of pages11
JournalBiodegradation
Volume26
Issue number6
DOIs
StatePublished - Sep 5 2015

Fingerprint

phthalate
Biodegradation
biodegradation
Carboxylic Acids
oxidation
Oxidation
Endocrine Disruptors
carboxylic acid
Carboxylic acids
Environmental Health
Biofilms
Biotransformation
Acids
acid
Electrons
dimethyl phthalate
phthalic acid
Oxygenation
endocrine disruptor
catabolism

Keywords

  • Di-oxygenation
  • Dimethyl phthalate
  • Intimate coupling
  • UV–HO

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Environmental Chemistry
  • Microbiology
  • Bioengineering

Cite this

Coupling UV–H2O2 to accelerate dimethyl phthalate (DMP) biodegradation and oxidation. / Chen, Bin; Song, Jiaxiu; Yang, Lihui; Bai, Qi; Li, Rongjie; Zhang, Yongming; Rittmann, Bruce.

In: Biodegradation, Vol. 26, No. 6, 05.09.2015, p. 431-441.

Research output: Contribution to journalArticle

Chen, Bin ; Song, Jiaxiu ; Yang, Lihui ; Bai, Qi ; Li, Rongjie ; Zhang, Yongming ; Rittmann, Bruce. / Coupling UV–H2O2 to accelerate dimethyl phthalate (DMP) biodegradation and oxidation. In: Biodegradation. 2015 ; Vol. 26, No. 6. pp. 431-441.
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