Effects of effluent organic matter (EfOM) on the removal of emerging contaminants by ozonation
Journal
Chemosphere
Journal Volume
151
Pages
332-338
Date Issued
2016
Author(s)
Abstract
Removal of emerging contaminants in wastewater treatment is essential to ensure the ecological health of the receiving water bodies. Ozonation is a promising technology to achieve this purpose but important wastewater characteristics affecting the optimal removal efficiency need to be elucidated. Secondary effluents contain effluent organic matter (EfOM), which can react directly with ozone as well as react as the initiator, promoter and inhibitor in the hydroxyl radical (OH) chain reactions resulting from ozone decomposition. These different reaction modes of EfOM, coupled with alkalinity and pH value, collectively determine the ozone and .OH exposures and the degradation of pharmaceutical compounds by ozonation. In this study, we determined the rate constants of EfOM collected from two municipal wastewater treatment plants in terms of direct ozone reaction, initiation, promotion and inhibition at various pH values (pH 6.0-7.5) and temperatures (10-30 °C). The rate constants of direct reaction and initiation generally increased with the increasing pH value while the rate constants of promotion and inhibition did not vary significantly. All rate constants increased with the increasing temperature. The removal of ibuprofen, acetylsulfamethoxazole and metoprolol in diluted secondary effluent by ozonation can be fairly-well modeled by using the determined rate constants of EfOM. © 2016 Elsevier Ltd.
Subjects
Effluent organic matter; Emerging contaminants; Hydroxyl radical; Ozonation
Other Subjects
Alkalinity; Biogeochemistry; Organic compounds; Ozone; Ozone water treatment; Ozonization; pH; Rate constants; Wastewater treatment; Effluent organic matter; Emerging contaminant; Hydroxyl radicals; Increasing temperatures; Municipal wastewater treatment plants; Pharmaceutical compounds; Receiving water bodies; Wastewater characteristics; Effluents; ibuprofen; metoprolol; n4 acetylsulfamethoxazole; organic matter; ozone; humic substance; hydroxyl radical; waste water; water pollutant; decomposition; effluent; hydroxyl radical; inhibition; inhibitor; inorganic matter; ozone; wastewater; water treatment; analytic method; Article; degradation; effluent; ozonation; pH; rate constant; temperature; waste water management; analysis; chemistry; humic substance; procedures; Taiwan; waste water; water management; water pollutant; Humic Substances; Hydroxyl Radical; Ozone; Taiwan; Waste Water; Water Pollutants, Chemical; Water Purification
Type
journal article