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- Title
Unhairing wastewater treatment by Bacillus pumilus and Bacillus cereus.
- Authors
Mlaik, Najoua; Bouzid, Jalel; Hassan, Ines Ben; Woodward, Steve; Elbahri, Lassad; Mechichi, Tahar
- Abstract
Two proteolytic bacteriaBacillus pumilusandBacillus cereuswere isolated from an aerobic tannery effluent treatment tank. Both strains were characterized and used for the treatment of unhairing wastewater during batch experiments. Chemical oxygen demand (COD), biomass production and protease activity were determined during the incubation period. The maximum COD removals were of 41 and 44% after 10 days incubation inB. cereusandB. pumilus, respectively.Optimum pH and temperature for protease and keratinase production by both strains were also investigated. Results showed that the optimum temperature and pH of protease production in the cultures ofB. pumilusandB. cereuswere of 30°C and 9.0, respectively. Under these optimum conditions, proteolytic activities were 283.8 and 515.8 U/mL in the cultures ofB. cereusandB. pumilus, respectively. Optimum keratinase production by cultures of both bacteria occurred at the same temperature and pH of the protease production.
- Subjects
BIOLOGICAL nutrient removal; WASTEWATER treatment; BACILLUS pumilus; BACILLUS cereus; PROTEOLYTIC enzymes
- Publication
Desalination & Water Treatment, 2015, Vol 54, Issue 3, p683
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.883330