Assessing a mixture of biosurfactant and enzyme pools in the anaerobic biological treatment of wastewater with a high-fat content
2014
Damasceno, F.R.C. | Freire, D.M.G. | Cammarota, M.C.
The use of rhamnolipid-type biosurfactant produced by Pseudomonas aeruginosa was evaluated for solubilization of fat present in effluent from a poultry processing plant, followed by anaerobic biological treatment. The rhamnolipid was used in combination with enzyme pools produced by solid medium fermentation of the fungi Penicillium simplicissimum and Penicillium brevicompactum . In experiments with raw effluent, the accumulation of fat caused the specific methane production (SMP) to be much less than with pretreated effluent (0.074 vs. 0.167 L CH ₄/g chemical oxygen demand (COD) removed). In experiments with pretreated effluent, the SMP ranged from 0.105 to 0.207 L CH ₄/g COD ᵣₑₘₒᵥₑd. A statistical analysis of the results of four sequential batches found that all variables had a significant effect on the SMP in the fourth batch. A fifth batch was initiated for three conditions, and it led to the highest SMP when compared with the control, which showed similar behaviour for the SMP over time, ending up with values three times greater than the SMP in the control conditions. The residual oil and grease analysis revealed removals from 51% to 90% with pretreated effluent and only 1% in the control conditions with raw effluent. Thus, the best synergistic effect of fat release/hydrolysis of effluent components from a poultry processing plant was found with a 0.5% P. brevicompactum pool and rhamnolipid at half the critical micelle concentration (24 mg/L).
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