Simultaneous Removal of Oxytetracycline and Sulfamethazine Antibacterials from Animal Waste by Chemical Oxidation Processes

Abstract

Simultaneous degradation of oxytetracycline (OTC) and sulfamethazine (SMZ) antibacterials in synthetically contaminated cow manure (20 mg of antibacterials/kg of manure) in the presence and absence of bedding was investigated by the application of ozone, Fenton, and persulfate oxidation processes. Almost the complete removal of antibacterials was attained with all oxidation processes, which were combined with a pretreatment of manure with magnesium (Mg(2+)) salt desorption. Among the investigated oxidation processes, thermally activated persulfate oxidation with 25 mM Na(2)S(2)O(8) at 50 degrees C was also applied to the animal feeding operations wastewater, and the pseudo-first-order degradation rate constants of OTC and SMZ were found as 3.22 and 1.25 (1/h), respectively. Thermally activated persulfate treatment resulted in the reduction of 82% inhibition of OTC and SMZ to 7%, indicating the production of almost nontoxic degradation products in the wastewater.

Simultaneous Removal of Estrogens and Antibiotics from Livestock Manure Using Fenton Oxidation Technique

“…At higher concentrations of ferrous iron, HO· radicals were scavenged by reacting with excess Fe 2+ , as shown in Equation (6) [35]. Similar results were reported by Li and Zhang [27] and Uslu et al [22].…”

“…Based on the above result, some target compounds remained in the slurry under the optimal Fenton oxidation conditions, but it was unclear whether the residue was in manure or filtrate. However, a study conducted by Uslu et al [22] reported that only 1.7% of the oxytetracycline (OTC) and 2.2% of the sulfamethazine (SMZ) remained in the filtrate, even at optimal conditions. This finding indicated that lower target compounds in the filtrate were residual, in that, after the reaction, there was a low filtrate volume due to the high water-absorbing property of manure [36], and this may not have had a significant negative impact on the environment.…”

“…As an environmentally-friendly technology, some laboratory studies have shown that the Fenton process could remove estrogens and antibiotics in manure [21][22][23][24]. Sun et al [21] reported that 97.8% of estradiol (E2) was removed in cow manure.…”

“…Sun et al [21] reported that 97.8% of estradiol (E2) was removed in cow manure. Uslu and Balcioglu [22] found that the Fenton process in animal waste could remove up to 98.3% of oxytetracycline and 97.8% of sulfamethazine. Another study by Ben et al [24] demonstrated that antibiotics such as sulfamethoxazole and sulfadimethoxine (SDM) could be reduced by up to 92% and 99% by Fenton's reagent, respectively.…”

Sonochemical degradation of azithromycin in aqueous solution

“…Uslu and Balcioglu reported almost total removal of antibiotics i.e. oxytetracycline and sulfamethazine, but the main concern with the ozonation process is the possibility of converting toxic compounds into undegradable compounds (11). The ultrasonic method is a sample of advanced oxidation processes (AOPs) that decomposes and degrades organic pollutants.…”