Removal of saxitoxins from drinking water by granular activated carbon, ozone and hydrogen peroxide--implications for compliance with the Australian drinking water guidelines.
In a laboratory-scale trial, we studied the removal of saxitoxins from water by ozone, granular activated carbon (GAC) and H(2)O(2), and considered the implications of residual toxicity for compliance with the Australian drinking water standards. Cell-free extracts of Anabaena circinalis were added to raw, untreated drinking water obtained from a water supply reservoir to provide a toxicity of 30 microg (STX equivalents)l(-1). Ozone alone, or in combination with H(2)O(2), failed to destroy the highly toxic STX and GTX-2/3, and only partially destroyed dc-STX, and the low-toxicity C-toxins and GTX-5. In all cases, the toxicity of the water was reduced by less than 10%. GAC removed all of the STX, dc-STX and GTXs, but only partially removed the C-toxins. However, the residual toxicity was reduced to the suggested Australian drinking water guideline concentration of 3 microg (STX equivalents)l(-1) without O(3) pre-treatment. Modelling the spontaneous chemical degradation of residual C-toxins following treatment shows that residual toxicity could increase to 10 microgl(-1) after 11 d due to formation of dc-GTXs and would then gradually decay. In all, residual toxicity would exceed the Australian drinking water guideline concentration for a total of 50 d.
Orr
Philip T
PT
CSIRO Land and Water, Brisbane Laboratory, 120 Meiers Rd, Indooroopilly Qld 4068, Australia. philip.orr@bigfoot.com
Jones
Gary J
GJ
Hamilton
Geoffrey R
GR
D017033:Anabaena; D001315:Australia; D002244:Carbon / Q000737:chemistry; D019983:Guideline Adherence; D006861:Hydrogen Peroxide / Q000737:chemistry*; D016877:Oxidants / Q000737:chemistry*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D011786:Quality Control; D012530:Saxitoxin / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods* / Q000592:standards
D016877:Oxidants; D010083:Oxidants, Photochemical; D012530:Saxitoxin; D010126:Ozone; D002244:Carbon; D006861:Hydrogen Peroxide