Table 1 Physicochemical characteristics of the wastewater treatment in fifteen different assessment stations in the central of Tunisia
Sample | Colour | Odour | Presence of particules | pH (Mean value) | TSS (Mean value) | BOD (mg/L) (Mean value) | COD (mg/L) (Mean value) | Cl (mg/L) (Mean value) |
|---|---|---|---|---|---|---|---|---|
Kasserine | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Highly | None | 7.0 ± 1.0 | 617 | 610 | 959 | 437 |
   Exist point | Colourless | Offensive | None | 8.0 ± 1.0 | 75 | 70 | 120 | 295 |
Sbeitla | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Odourless | None | 7.0 ± 1.0 | 455 | 473 | 941 | 334 |
   Exist point | Colourless | Odourless | None | 8.0 ± 1.0 | 27 | 27 | 86 | 289 |
Sidi-bouzid | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Creamy | Not offensive | Suspended | 7.0 ± 1.0 | 520 | 610 | 1130 | - |
   Exist point | Pink | Not offensive | Suspended | 8.0 ± 1.0 | 76 | 87 | 127 | - |
Mahdia | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 480 | 386 | 1185 | 2760 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 39 | 39 | 127 | 2690 |
El-Jem | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Creamy | Not offensive | Suspended | 7.0 ± 1.0 | 336 | 364 | 1010 | 622 |
   Exist point | Pink | Not offensive | Suspended | 8.0 ± 1.0 | 67 | 83 | 141 | 506 |
Ksou-essaf | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 733 | 411 | 1420 | 719 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 28 | 25 | 97 | 648 |
Kairouan | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Odourless | None | 7.0 ± 1.0 | 440 | 557 | 1408 | 497 |
   Exist point | Colourless | Odourless | None | 8.0 ± 1.0 | 25 | 26 | 84 | 426 |
Jammel | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 240 | 270 | 795 | 604 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 25 | 30 | 106 | 639 |
Ouardanine | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 386 | 472 | 1131 | 622 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 28 | 31 | 80 | 426 |
El-frina | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 405 | 345 | 1150 | 1163 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 25 | 30 | 97 | 1246 |
Dkhila | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 348 | 335 | 1040 | 1597 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 26 | 23 | 71 | 1216 |
Sahline | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 322 | 369 | 1268 | 587 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 13 | 21 | 70 | 489 |
Msaken | Â | Â | Â | Â | Â | Â | Â | Â |
   Enteance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 604 | 488 | 1085 | 542 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 24 | 22 | 59 | 486 |
Sousse-Nord | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 338 | 336 | 825 | 1030 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 33 | 15 | 78 | 728 |
Sousse-Sud | Â | Â | Â | Â | Â | Â | Â | Â |
   Enterance point | Colourless | Not offensive | None | 7.0 ± 1.0 | 409 | 406 | 800 | 710 |
   Exist point | Colourless | Not offensive | None | 8.0 ± 1.0 | 43 | 48 | 117 | 639 |