Abstract
Acrylonitrile (C3H3N) widely used in chemical raw materials has biological toxicity with –CN bond, so it is the key to removal of cyanide from acrylonitrile wastewater. In our previous research and investigation, a strain was identified as Arthrobacter nitroguajacolicus named ZJUTB06-99 and was proved to be capable of degrading acrylonitrile. In this paper, the strain ZJUTB06-99 was domesticated with acrylonitrile-containing medium and its decyanidation and denitrification in simulated acrylonitrile wastewater were studied. The intermediate product of acrylonitrile in degradation process was identified through gas chromatography–mass spectrometer, as well as the biodegradation pathway of acrylonitrile in wastewater was deduced tentatively. The kinetics equation of biodegradation of acrylonitrile was lnC = − 0.1784t + 5.3349, with the degradation half-life of acrylonitrile in wastewater by 3.885 h. The results of this study showed that the optimum levels of temperature, pH and bacteria concentration to attain the maximum biodegradation were obtained as 30 °C, 6 and 100 g/L, respectively. The disadvantages of the biodegradation with this strain and its possible enhanced method to degrade acrylonitrile in wastewater were also discussed.
Highlights
Acrylonitrile is a kind of highly poisonous organic compound bearing a –CN group that is extensively used in synthesis of rubbers, acrylic fibers, plastics and other synthetic materials (Baxter et al 2006; Ramteke et al 2013)
Guo et al AMB Expr (2018) 8:191 agar powder to discuss these cells on biotransformation of acrylonitrile, and the results indicated that the bacteria could efficiently be used for the bioconversion of acrylonitrile to acids without producing amides (Agarwal and Nigam 2017; Nigam et al 2009)
Biodegradation pathway of acrylonitrile In order to understand the biodegradation process of acrylonitrile, the intermediate product during the experiment were tentatively detected by gas chromatography–mass spectrometer (GC–MS)
Summary
Acrylonitrile is a kind of highly poisonous organic compound bearing a –CN group that is extensively used in synthesis of rubbers, acrylic fibers, plastics and other synthetic materials (Baxter et al 2006; Ramteke et al 2013). Acrylonitrile is third of the 129 priority pollutants listed by EPA (Keith and Telliard 1979; Kumar et al 2008). A large amount of acrylonitrile wastewater is generated during the production (Lai et al 2012), which has inevitably caused serious impact on public and environmental health (Ramteke et al 2013). These emerging pollution sources are highly toxic, carcinogenic It is urgent to explore safe and efficient treatment technology on acrylonitrile wastewater treatment
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