African Journal of

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12168

Article in Press

Bacterial enzyme, sulphate, nitrate and ultimate latex paint biodegradation

Etim, Lawrence B.

  •  Received: 13 May 2019
  •  Accepted: 26 June 2019
The role of bacterial extracted enzyme, nitrate and sulpahte mobilization in latex paint degradation was investigated. The result revealed that degradation rate ie paint utilization was better enhanced by the presence of sulphate (SO42-) than nitrate (NO3-) though at no significant level (p>0.01). However, Bacillus species exceptionally mobilized nitrate (19.4mm) than sulphate (18.9mm). The overall mobilization rate for sulphate is represented thus: Micrococcus sp (20.2mm)> Bacillus sp (18.9mm)> Pseudomonas sp (12.6mm) while the reverse occurred for nitrate as; Bacillus sp (19.4)> Pseudomonas sp (11.1mm)> Micrococcus sp (10.6mm).The ultimate degradation of latex paint measured as index of dissolved oxygen(DO) indicated that bacterial contaminants exhibited high rate of paint degradation with significant (p<0.05) difference and variation among the bacterial species and in all cases, the level of DO dropped with increase in incubation period. The enzymatic activities on paint breakdown showed a direct correlation (r=0.01) on percentage degradation and incubation period. Increase in incubation period corresponded with increase in percentage degradation of paint with no significant difference among the bacterial species. Results obtained from this investigation indicate and confirm that extracellular enzymes, presence of sulphate\ nitrate ions and dissolve oxygen in paint as an organic substrate contributed immensely to the bacterial degradation of paint molecule. Therefore, empirical studies aim at controlling these deleterious problems in paint industry is suggested.

Keywords: mobilization, contaminants, extracellular, proliferation