SUVA as control parameter for the effective ozonation of organic pollutants in secondary effluent

Abstract

Recent research projects have shown a good suitability of the ozonation process to transform trace concentrations of most pharmaceuticals in wastewater treatment plant (WWTP) effluents. The concentrations of carbamazepine and 17 alpha-ethinylestradiol, for instance, were reduced below their detection limits by use of ozone dosages resulting in a specific ozone consumption of 0.5 mg O3/mg DOC0. At the same time a good disinfection performance was achieved. The given hygienic requirements of the EU bathing water directive (e.g. 2,000 N/100 mL faecal coliforms) are fulfilled without the formation of bromate (<10 microg/L). As technical control parameter of the ozonation process usually the residual ozone in the liquid phase or in the off-gas are used. However, at very low specific ozone consumptions, ozone reacts instantaneously with dissolved compounds and cannot be detected. Hence, alternative parameters should be used for effective operation control. The present paper evaluates the relation between UVA decrease and the removal of different compounds (endocrine disrupting compounds, pharmaceuticals, iodinated X-ray contrast media), microbial parameters and bromate formation. The results can be used as a guideline for the control of the oxidation performance at large scale ozonation units.

Ozonation for source treatment of pharmaceuticals in hospital wastewater – Ozone lifetime and required ozone dose

“…Furthermore, the removal of each compound from different effluent samples of the same source treated with the same ozone dose differed considerably. This is in accordance with previous findings [6,7,10,26]. In order to determine the ozone dose that is required to achieve 90 % removal of each pharmaceutical, the data in Figure 2 were fitted with Equation 5.…”

“…The integration of ozone as an additional treatment step in the existing WWTP has become a widely accepted polishing technology for removing pharmaceuticals and other micro-pollutants in wastewater effluents [5][6][7][8][9][10]. Furthermore, treatment with ozone was found to be more cost effective than UV or UV/H 2 O 2 in the removal of estrogens in effluent from biologically treated wastewater [7,11] and it is more easily applied than activated carbon.…”

Development of surrogate correlation models to predict trace organic contaminant oxidation and microbial inactivation during ozonation

“…Buffle et al (2006) proposed the use of DUV to determine ozone exposure in wastewater applications after observing a first-order kinetic relationship between the two parameters. Based on this concept, Bahr et al (2007), Wert et al (2009b), and Nanaboina and Korshin (2010) developed preliminary correlations between DUV 254 and several indicator compounds and microbes. Bahr et al (2007) presented the linear regression parameters in relation to second-order ozone and OH rate constants.…”

“…Based on this concept, Bahr et al (2007), Wert et al (2009b), and Nanaboina and Korshin (2010) developed preliminary correlations between DUV 254 and several indicator compounds and microbes. Bahr et al (2007) presented the linear regression parameters in relation to second-order ozone and OH rate constants. Wert et al (2009b) indicated that ozone-susceptible target compounds (i.e., k O3 > 10 3 M À1 s…”

Organic removal assessment at full-scale treatment facilities using advanced organic characterization tools

“…SUVA as an important parameter has been used to determine the conjugation and aromaticity of DOM by many researchers. [7][8][9] The SUVA value indicates to some extent the quality of the water and the treatability of DOM by coagulation. 27 SUVA values beyond 3 L mg À1 m À1 indicate the presence of hydrophobic, humic-like and high M w organic matter, which can be easily removed by advanced coagulation.…”