Bioaugmentation process of secondary effluents for reduction of pathogens, heavy metals and antibiotics
The study probed into reducing faecal indicators and pathogenic bacteria, heavy metals and β-lactam antibiotics, from four types of secondary effluents by bioaugmentation process, which was conducted with Bacillus subtilis strain at 45 'C. As a result, faecal indicators and pathogenic bacteria...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IWA Publishing
2016
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4262/ http://eprints.uthm.edu.my/4262/1/AJ%202016%20%2829%29.pdf |
| Summary: | The study probed into reducing faecal indicators and pathogenic bacteria, heavy metals and β-lactam antibiotics, from four types of secondary effluents by bioaugmentation process, which was conducted with Bacillus subtilis strain at 45 'C. As a result, faecal indicators and pathogenic bacteria were reduced due to the effect of thermal treatment process (45 'C), while the removal of heavy metals and β-lactam antibiotics was performed through the functions of bioaccumulation and biodegradation processes of B. subtilis. Faecal coliform met the guidelines outlined by WHO and U. S. EPA standards after 4 and 16 days, respectively. Salmonella spp. and Staphylococcus aureus were reduced to below the detection limits without renewed growth in the final effluents determined by using a culture-based method. Furthermore, 13.5% and 56.1% of cephalexin had been removed, respectively, from secondary effluents containing 1 g of cephalexin L�1 (secondary effluent 3), as well as 1 g of cephalexin L�1 and 10 mg of Ni2 L�1 (secondary effluent 4) after 16 days. The treatment process, eventually, successfully removed 96.6% and 66.3% of Ni2 ions from the secondary effluents containing 10 mg of Ni2 L�1 (secondary effluent 2) and E4, respectively. The bioaugmentation process improved the quality of secondary effluents. |
|---|