Abstract
The goal of this study was to integrate the activities of paint deterioration of microbial communities (microcosms) on the basis of environmental factors. The effect of temperature and pH on bacterial degradation of latex paint under humid condition by bacterial isolates was studied. Results obtained revealed that paint industrial waste (PIW) and paint film scrap (PFS) contained approximately 28.2% to 37.3% of dry organic content (DOC), pH 6.6 to 8.3, optical density (OD) 2.5 to 3.9 and undetermined amount of Ca2+, Na+, K+, SO4 2- and NO3-. Thirteen (13) isolates were obtained from PIW and fifty two (52) from PFS. The main heterotrophic count ranged from 8.7 to 9.4 × 108 cfuml-1 for PIW and 3.4 to 6.8 × 106 cfuml-1 for PFS. The bacterial genera and their percentage occurance for PIW and PFS were: Pseudomonas (40:32%), Bacillus (26:44%), Norcadia (9:6%), Streptomyces (0:6%), Alcaligenes (11:3%), Micrococcus (14:7%) and Flavobacterium (0:27%) respectively. The organisms exhibited various degree of paint degradation under different temperature and pH points. Pseudomonas demonstrated the highest rate of degradation at pH 7.4 and the lowest at pH 4.2. Bacillus had its highest rate at pH 6.3 and lowest at pH 3.5 while that of Micrococcus occurred at pH 4.2 and 8.1 respectively. Equally, Pseudomonas and Bacillus had double peaks of degradation at 28oc and 40oc while that of Micrococcus occurred only at 40oc. However, 28oc and 40oc are considered optimal and maximal temperature for biodegradation of paint. Also, the effect of pH and temperature was independent and insignificance at P < 0.05. The study therefore, indicated that paint and painted surfaces (objects) can be preserved from bacterial contamination, deterioration and degradation by controlling the storing pH and temperature.KEYWORDS: Paint, temperature, pH, biodegradation, significance.
Highlights
Paint is described as a liquefiable mastic material capable of being applied in a thin layer over a surface
The constituent provide different ecological niches that are exploited by a large variety of microbial species as nutrient.Given the wide range of these substrates, many microorganisms may grow provided that favourable environmental conditions such as; temperature, oxygen concentration, humidity, pH changes and light are met
The authors opined that Pseudomonas, Bacillus, Norcadia, Alcaligenes, Micrococcus, Streptomyces and Flavobacterium are characteristic biodeteriogens of paints
Summary
Paint is described as a liquefiable mastic material capable of being applied in a thin layer over a surface. The thin layer is converted into an opaque solid film (Kappock,1977; Linder,2005). Paint is composed of organic and inorganic pigments, solvents, binders and thickeners (Realimi et al 1988; Gettens et al, 1990, Strezelezyk, 1981, Montegut et al; 1991 and Guglieminette et al; 1994). These composit parts of paint and painted film act as substrate with a wide range of organic and inorganic constituents. The constituent provide different ecological niches that are exploited by a large variety of microbial species as nutrient.Given the wide range of these substrates, many microorganisms may grow provided that favourable environmental conditions such as; temperature, oxygen concentration, humidity, pH changes and light are met
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