[Impacts of AOC by O3/TiO2 catalytic oxidation in drinking water].
This paper presents catalytic oxidation with titanium dioxide nano-particles loaded on several selected carriers, which are ceramic, silica gel and zeolite, to remove nitrobenzene from drinking water in ozonation. In this study assimilable organic carbon (AOC) is our interest and assumed as a parameter responsible for low molecule organic carbon such as ketone, aldehyde, alcohols and carboxyl acids in drinking water. Catalytic oxidation is more effective than ozonation alone in the degradation of larger fractions of organics to lower fractions. AOC was increased from 300 microg/L to 674.1 microg x L(-1), 847.2 microg x L(-1) and 882.1 microg x L(-1) by the catalysis ozonation of cerami/TiO2, silica gel/TiO2, cerami/TiO2 respectively, and the proportion of AOC in TOC can be increased from 4.68% to 30.5%, 33.21% and 46.04%, respectively. The catalytic oxidation enhanced the biologradability of organics in the water greatly. With the ozone dosage increase, AOC began to reduce slightly because the low molecular size organic carbon was mineralized. In the processes, AOC-NOX consisting of carboxyl acid mostly increased rapidly, resulting in increase of the proportion of AOC-NOX in AOC over 90% and the majority of AOC turned from AOC-P17 to AOC-NOX.
Liang
Tao
T
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Ma
Jun
J
Wang
Sheng-jun
SJ
Yang
Yi-xin
YX
Zhang
Jing
J
D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D002384:Catalysis; D053758:Nanoparticles / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis*
D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D010126:Ozone; D002244:Carbon; D014025:Titanium