Table 1 Expert assessment for ballast water treatment technologies
Criteria | Alternatives | Expert assessment | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
Efficacy on microorganisms | Heat | C | D | B | B | C | C | D | C | C |
Ultraviolet | G | F | G | G | G | G | F | F | F | |
Ozone | G | G | E | G | G | F | F | G | F | |
Ultrasound | E | E | F | E | F | D | E | E | E | |
Biocide | F | G | G | F | F | G | E | F | G | |
Efficacy on organics | Heat | B | A | A | C | C | B | C | C | B |
Ultraviolet | F | E | G | F | G | F | F | G | F | |
Ozone | F | G | E | D | F | E | F | G | E | |
Ultrasound | E | E | D | E | D | E | D | E | C | |
Biocide | B | B | A | B | B | B | C | B | A | |
Adaptability to harsh environment | Heat | C | B | D | C | B | C | C | B | C |
Ultraviolet | F | E | G | F | F | E | F | E | F | |
Ozone | F | E | E | F | G | D | E | F | G | |
Ultrasound | E | E | F | D | E | D | E | D | D | |
Biocide | D | D | F | E | D | E | D | C | D | |
Capital cost | Heat | F | D | E | E | F | E | F | E | E |
Ultraviolet | D | E | D | E | D | B | D | D | C | |
Ozone | C | D | C | D | C | C | C | B | C | |
Ultrasound | B | C | B | C | D | C | D | B | D | |
Biocide | G | F | F | E | G | F | E | F | E | |
O&M cost | Heat | F | G | F | E | E | G | E | F | G |
Ultraviolet | D | E | E | D | D | E | D | E | E | |
Ozone | C | C | C | D | C | E | C | D | C | |
Ultrasound | C | B | C | C | D | D | B | C | D | |
Biocide | D | E | D | F | F | E | D | E | F | |
Human risk | Heat | G | F | G | E | F | F | E | E | F |
Ultraviolet | C | C | D | C | D | C | D | C | B | |
Ozone | C | D | B | D | E | D | E | C | D | |
Ultrasound | B | D | D | C | D | D | E | D | C | |
Biocide | B | B | C | C | D | C | C | D | B | |
Ecological risk | Heat | C | D | B | C | D | E | C | E | D |
Ultraviolet | D | F | D | E | F | G | F | D | D | |
Ozone | F | E | D | E | E | F | F | D | E | |
Ultrasound | E | D | E | D | E | D | E | D | D | |
Biocide | C | B | E | D | C | C | D | C | C | |
Waste production | Heat | E | D | D | D | C | D | E | D | C |
Ultraviolet | F | G | F | E | F | G | G | F | E | |
Ozone | D | E | D | D | E | E | E | F | F | |
Ultrasound | D | C | C | C | D | D | E | D | E | |
Biocide | C | B | C | B | D | C | E | D | B | |