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Using Fenton Oxidation to Simultaneously Remove Different Estrogens from Cow Manure

View Article: PubMed Central - PubMed

ABSTRACT

The presence of estrogens in livestock excrement has raised concerns about their potential negative influence on animals and the overall food cycle. This is the first investigation to simultaneously remove estrogens, including estriol (E3), bisphenol A (BPA), diethylstilbestrol (DES), estradiol (E2), and ethinyl estradiol (EE2), from cow manure using a Fenton oxidation technique. Based on the residual concentrations and removal efficiency of estrogens, the Fenton oxidation reaction conditions were optimized as follows: a H2O2 dosage of 2.56 mmol/g, a Fe(II) to H2O2 molar ratio of 0.125 M/M, a solid to water mass ratio of 2 g/mL, an initial pH of 3, and a reaction time of 24 h. Under these conditions, the simultaneous removal efficiencies of E3, BPA, DES, E2, and EE2, with initial concentrations in cow manure of 97.40, 96.54, 100.22, 95.01, and 72.49 mg/kg, were 84.9%, 99.5%, 99.1%, 97.8%, and 84.5%, respectively. We clarified the possible Fenton oxidation reaction mechanisms that governed the degradation of estrogens. We concluded that Fenton oxidation technique could be effective for efficient removal of estrogens in livestock excrement. Results are of great importance for cow manure reuse in agricultural management, and can be used to reduce the threat of environmental estrogens to human health and ecological safety.

No MeSH data available.


Effect of the Fe(II) to H2O2 molar ratio on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0; the reaction time was 24 h. Error bars represent standard deviations.
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ijerph-13-00917-f002: Effect of the Fe(II) to H2O2 molar ratio on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0; the reaction time was 24 h. Error bars represent standard deviations.

Mentions: A larger Fe(II) to H2O2 molar ratio improved the removal of the five tested estrogens in cow manure by the Fenton oxidation technique, as shown in Table 3 and Figure 2. The residual concentrations of estrogens clearly decreased and their removal efficiency was enhanced when the Fe(II) to H2O2 molar ratio increased from 0 to 0.125 M/M in the test system. The rate of removal of target compounds increased when the molar ratio increased from 0.04 to 0.125 M/M. When the Fe(II) to H2O2 molar ratio increased from 0.04 to 0.125 M/M, the removal efficiencies of E3, BPA, DES, E2, and EE2 increased from 50.0%, 98.1%, 96.4%, 96.0%, and 60.0% to 82.1%, 99.3%, 99.5%, 98.6%, and 84.9%, respectively. The removal ratios of BPA, DES, and E2 were always higher than 96% at the test Fe(II) to H2O2 molar ratio of 0.04–0.125 M/M, and were much higher than the removal ratios for E3 and EE2.


Using Fenton Oxidation to Simultaneously Remove Different Estrogens from Cow Manure
Effect of the Fe(II) to H2O2 molar ratio on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0; the reaction time was 24 h. Error bars represent standard deviations.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036750&req=5

ijerph-13-00917-f002: Effect of the Fe(II) to H2O2 molar ratio on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0; the reaction time was 24 h. Error bars represent standard deviations.
Mentions: A larger Fe(II) to H2O2 molar ratio improved the removal of the five tested estrogens in cow manure by the Fenton oxidation technique, as shown in Table 3 and Figure 2. The residual concentrations of estrogens clearly decreased and their removal efficiency was enhanced when the Fe(II) to H2O2 molar ratio increased from 0 to 0.125 M/M in the test system. The rate of removal of target compounds increased when the molar ratio increased from 0.04 to 0.125 M/M. When the Fe(II) to H2O2 molar ratio increased from 0.04 to 0.125 M/M, the removal efficiencies of E3, BPA, DES, E2, and EE2 increased from 50.0%, 98.1%, 96.4%, 96.0%, and 60.0% to 82.1%, 99.3%, 99.5%, 98.6%, and 84.9%, respectively. The removal ratios of BPA, DES, and E2 were always higher than 96% at the test Fe(II) to H2O2 molar ratio of 0.04–0.125 M/M, and were much higher than the removal ratios for E3 and EE2.

View Article: PubMed Central - PubMed

ABSTRACT

The presence of estrogens in livestock excrement has raised concerns about their potential negative influence on animals and the overall food cycle. This is the first investigation to simultaneously remove estrogens, including estriol (E3), bisphenol A (BPA), diethylstilbestrol (DES), estradiol (E2), and ethinyl estradiol (EE2), from cow manure using a Fenton oxidation technique. Based on the residual concentrations and removal efficiency of estrogens, the Fenton oxidation reaction conditions were optimized as follows: a H2O2 dosage of 2.56 mmol/g, a Fe(II) to H2O2 molar ratio of 0.125 M/M, a solid to water mass ratio of 2 g/mL, an initial pH of 3, and a reaction time of 24 h. Under these conditions, the simultaneous removal efficiencies of E3, BPA, DES, E2, and EE2, with initial concentrations in cow manure of 97.40, 96.54, 100.22, 95.01, and 72.49 mg/kg, were 84.9%, 99.5%, 99.1%, 97.8%, and 84.5%, respectively. We clarified the possible Fenton oxidation reaction mechanisms that governed the degradation of estrogens. We concluded that Fenton oxidation technique could be effective for efficient removal of estrogens in livestock excrement. Results are of great importance for cow manure reuse in agricultural management, and can be used to reduce the threat of environmental estrogens to human health and ecological safety.

No MeSH data available.