Abstract
Acrylates/acrylic-containing chemicals are components of paints. During industrial production and applications, the acrylates and acrylic-containing compounds could contaminate/accumulate in water bodies and soil systems, hence the need for bioremediation. This study aimed to investigate the in vitro biodegradation of acrylic based paint; using an indigenous bacterial isolate namely; Alcaligenes faecalis and optimization of its activity in shake cultures. The bacterial isolate; A. faecalis (2 % v/v) was able to grow and effectively degrade 68 % of acrylic paints (1 %)-mended mineral salt medium after 14 d of incubation. The rate of biodegradation was significantly (p < 0.05) increased with increasing the medium concentration, inoculum size, agitation speed and nitrogen sources. The most significant biodegradation efficiencies were obtained at a pH of 7.2, temperature of 37 °C, an agitation speed of 200 rpm, an inoculum concentration of 10 %, paint concentration of 2 %; when yeast extract (10 %) was used as a major nitrogen source. Accordingly, this work provides baseline data for optimum biodegradation of acrylate by A. faecalis, and thus could be possibly exploited as an effective bioremediation agent for acrylic paint polluted sites.
Highlights
There is a global pollution of the environment by the synthetic wastes of various chemicals, which have filtered into different layers of air, water and soil matter, and cover the immediate and extended ecosystems (Sethy et al, 2011; Orjiakor et al, 2020).The release of these pollutant chemicals has been rated as a direct factor related to the large variety of anthropogenic activities; mainly attributed to the industrial/technological exploits that occur in several specific areas (Soudi and Kolahchi, 2011)
The test bacterium A. faecalis was selected based on the preliminary acrylic paint biotolerance screening test carried out on all the recovered isolates
Results from this study showed A. faecalis effectively metabolized the acrylic paint compounds with biodegradation rate of 68 % after 14 d of incubation
Summary
There is a global pollution of the environment by the synthetic wastes of various chemicals, which have filtered into different layers of air, water and soil matter, and cover the immediate and extended ecosystems (Sethy et al, 2011; Orjiakor et al, 2020).The release of these pollutant chemicals has been rated as a direct factor related to the large variety of anthropogenic activities; mainly attributed to the industrial/technological exploits that occur in several specific areas (Soudi and Kolahchi, 2011). There is a global pollution of the environment by the synthetic wastes of various chemicals, which have filtered into different layers of air, water and soil matter, and cover the immediate and extended ecosystems (Sethy et al, 2011; Orjiakor et al, 2020). A previous study of Sethy et al, (2011) revealed that issues of bioaccumulation associated with the ingestion and uptake of these chemical pollutants within the vital cellular organs of the humans and animals have been identified. Good examples of these chemosynthetic agents that can act as pollutants are the synthetic paints
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