GNISTÄNGSTUNNELN

TUNNEL WASH WATER TREATMENT

Treatment feasibility study of tunnel wash water and design of a treatment system capable of treating all tunnel wash water in Gothenburg.

Utilizing Swedish Hydro Solutions chitosan and BioMedia treatment, suspended sediment was reduced from 13 000 mg/l to <1 mg/l after treatment. The removal efficiency for heavy metals was 96-99 % and for organic contaminants 93-99,9 %

RESULTS

SUSPENDED PARTICLES, mg/l

  • GUIDELINE VALUE, GOTHENBURG (25 mg/l)
  • UNTREATED WATER (13 000 mg/l)
  • AFTER TREATMENT (CHITOSAN) (24 mg/l)
  • AFTER TREATMENT (CHITOSAN + BIOMEDIA) ( <1 mg/l )

MERCURY

  • GUIDELINE VALUE, GOTHENBURG (0.05 µg/l)
  • MERCURY IN UNTREATED WATER (0,11 µg/l)
  • AFTER TREATMENT (CHITOSAN) (0,0041 µg/l)
  • AFTER TREATMENT (CHITOSAN + BIOMEDIA) (<0,002 µg/l)

BENZO(A)PYRENE

  • GUIDELINE VALUE, GOTHENBURG (0,05 µg/l)
  • BENZO(A)PYRENE IN UNTREATED WATER (2,2 µg/l)
  • AFTER TREATMENT (CHITOSAN) (< 0,01 µg/l)
  • AFTER TREATMENT (CHITOSAN + BIOMEDIA) (<0,01 µg/l)

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