Use of chlorine dioxide for biofilm control in sedimentation basins and impacts on treatment processes.
Published: 2004
Language: eng
Number of pages: 195
Description: Application of chlorine dioxide was investigated to control biofouling in sedimentation basins and to determine impacts on downstream drinking water processes, (settling and ozonation). Bench scale tests were conducted to simulate each treatment process. Suspended and attached heterotrophic plate counts and acridine orange direct counts were used to quantify biofilm formation; no significant difference (99% confidence level), was observed between disinfected reactors (1.0 mg/L) and the control reactor. However, a 1.0 mg/L chlorine dioxide dose produced 86% less adsorbable organic halides than water treated using chlorine at the same dose. Ferrous was observed to reduce 100% of chlorite to chloride at a ferrous to chlorite ratio of 3.3 to 1.0 by mass, at pH 7. Both chlorine dioxide and chlorine at 1.0 mg/L were observed to lower bromate formation and ozone demand when compared to a control; the extent of bromate inhibition depended on the applied ozone dose.
Notes: Adviser:  R. Andrews.

Thesis (M.A.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2274.

MICR copy on microfiche (3 microfiches).