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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 H2O2 dosage on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the Fe(II) to H2O2 molar ratio was 0.10 M/M; 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-f001: Effect of H2O2 dosage on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the Fe(II) to H2O2 molar ratio was 0.10 M/M; 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: The H2O2 dosage significantly influenced the removal of tested estrogens by Fenton oxidation in cow manure. As shown in Table 2 and Figure 1, the residual concentrations of estrogens in cow manure after Fenton oxidation for 24 h dramatically decreased when the H2O2 dosage increased from 0 to 2.56 mmol/g, and then increased with H2O2 dosage from 2.56 to 3.59 mmol/g. As a consequence, the removal efficiencies of estrogens were first enlarged and then reduced when the H2O2 dosage increased from 0 to 2.56 mmol/g and then to 3.59 mmol/g. The lowest concentrations of E3, BPA, DES, E2, and EE2 were observed at H2O2 dosage of 2.56 mmol/g, and were 15.92, 0.29, 0.48, 2.14 and 12.11 mg/kg with corresponding removal efficiencies of 83.4%, 99.3%, 99.5%, 97.3%, and 82.9%, respectively. At the test H2O2 dosage of 1.11 to 3.59 mmol/g, the respective removal efficiencies of E3, BPA, DES, E2, and EE2 were always higher than 46.0%, 98.37%, 96.14%, 89.15%, and 41.28%, respectively. However, the removal efficiencies of BPA, DES, and E2 by Fenton oxidation with a H2O2 dosage of 1.11–3.59 mmol/g were much higher than those of E3 and EE2.


Using Fenton Oxidation to Simultaneously Remove Different Estrogens from Cow Manure
Effect of H2O2 dosage on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the Fe(II) to H2O2 molar ratio was 0.10 M/M; 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

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

ijerph-13-00917-f001: Effect of H2O2 dosage on the removal efficiency of estrogens from cow manure by the Fenton oxidation process. Note: the Fe(II) to H2O2 molar ratio was 0.10 M/M; 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: The H2O2 dosage significantly influenced the removal of tested estrogens by Fenton oxidation in cow manure. As shown in Table 2 and Figure 1, the residual concentrations of estrogens in cow manure after Fenton oxidation for 24 h dramatically decreased when the H2O2 dosage increased from 0 to 2.56 mmol/g, and then increased with H2O2 dosage from 2.56 to 3.59 mmol/g. As a consequence, the removal efficiencies of estrogens were first enlarged and then reduced when the H2O2 dosage increased from 0 to 2.56 mmol/g and then to 3.59 mmol/g. The lowest concentrations of E3, BPA, DES, E2, and EE2 were observed at H2O2 dosage of 2.56 mmol/g, and were 15.92, 0.29, 0.48, 2.14 and 12.11 mg/kg with corresponding removal efficiencies of 83.4%, 99.3%, 99.5%, 97.3%, and 82.9%, respectively. At the test H2O2 dosage of 1.11 to 3.59 mmol/g, the respective removal efficiencies of E3, BPA, DES, E2, and EE2 were always higher than 46.0%, 98.37%, 96.14%, 89.15%, and 41.28%, respectively. However, the removal efficiencies of BPA, DES, and E2 by Fenton oxidation with a H2O2 dosage of 1.11–3.59 mmol/g were much higher than those of 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.