Bacteria removal from wastewater in sedimentation process in the primary settling tank [21, 24]
| Type/Genius | Reduction [%] | Source |
|---|---|---|
| Coliforms | 10 | Bitton [2011] |
| Faecal coliforms | 35 | Bitton [2011] |
| Escherichia coli | 15 | Olańczuk-Neyman and Quant [2015] |
| Mycobacterium tuberculosis | 50 | Olańczuk-Neyman and Quant [2015] |
| Salmonella spp. | 15 | Olańczuk-Neyman and Quant [2015] |
| Shigella spp. | 15 | Olańczuk-Neyman and Quant [2015] |
| Clostridium perfingens | 60 | Bitton [2011] |
Number of microorganisms in 1 g of wet mass of raw sewage sludge [18]
| Organism | Type/Genus | Number in 1 g wet mass of sediment |
|---|---|---|
| Bacteria | E. coli | 106 |
| Salmonella | 102 – 103 | |
| Viruses | Enteroviruses | 102 – 104 |
| Protozoa | Giardia | 102 – 103 |
| Helminths | Ascaris | 102 – 103 |
| Toxocara | 10 – 102 | |
| Taenia | 5 |
Selected methods used in disinfection of wastewater and sewage sludge
| Methods used in disinfection | Disinfection of wastewater | Disinfection of sewage sludge |
|---|---|---|
| Chlorination | + | + |
| Ozonation | + | + |
| Performic acid (PFA) | + | - |
| Peracetic acid (PAA) | + | + |
| Pasteurization | + | + |
| UV radiation | + | + |
| Membrane methods | + | - |
| Ultrasounds | + | + |