Aluminum Contamination Due to Firework Industry

Aluminum Contamination Due to Firework Industry

Soil sample analysis



The amount of aluminium present in the explosive (firework industry) contaminated soil sample was estimated as 3.649 mg/L using atomic absorption spectrophotometer.



Aluminium resistance and species identification



The strain isolated from the firework industry was able to survive metal concentration as high as 100 mg/L aluminium in LB agar. Based on the 16S rRNA gene sequencing, it was identified as Bacillus safensis and submitted in Genbank database with accession number KC569464 (Fig. 1). Batch biosorption studies



Effect of pH

The pH of the media is considered to be one of the most important environmental factors affecting the biosorption process. Moreover, it affects the solubility of metals and ionization state of functional groups which includes carboxyl, phosphate and amino groups of cell wall (Wang and Sun 2013). The effect of pH on the biosorption of aluminium is presented in Fig. 2a. Results show that the amount of aluminium ion uptake increased (10 – 92 mg/L) by rise in pH values (2.0 – 6.0) and the maximum removal efficiency was observed at pH 6. At low pH (less than 4.0) heavy metal removal was inhibited, as a result of positive charge density on metal binding due to a high concentration of protons in solution. With an increase in pH, the negative charge density on the cell surface increases due to deprotonation of the metal binding sites and thus increases biosorption (Say et al. 2001). At alkaline pH, more Al appears in a

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