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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 reaction time 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 H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0. Error bars represent standard deviations.
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ijerph-13-00917-f005: Effect of reaction time 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 H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0. Error bars represent standard deviations.

Mentions: The removal of the five tested estrogens in cow manure by Fenton oxidation was very fast during the first 6 h of the reaction (Table 6 and Figure 5). Over the 6 h period, 73.15%, 98.43%, 96.48%, 93.79%, and 68.61% of E3, BPA, DES, E2, and EE2 in cow manure was degraded. Extending the reaction time from 6 to 24 h led to lower residual concentrations and a higher removal efficiency of the test estrogens in cow manure. The removal efficiencies were 84.9%, 99.5%, 99.1%, 97.8%, and 84.5% for E3, BPA, DES, E2, and EE2, respectively, for a reaction time of 24 h. However, when the reaction time was prolonged from 24 to 72 h, the residual concentrations and removal efficiencies of the estrogens did not change significantly (Table 6 and Figure 5). As a consequence, 24 h is the optimum reaction time for the removal of test estrogens in cow manure by the Fenton oxidation technique.


Using Fenton Oxidation to Simultaneously Remove Different Estrogens from Cow Manure
Effect of reaction time 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 H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0. Error bars represent standard deviations.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-13-00917-f005: Effect of reaction time 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 H2O2 dosage was 2.56 mmol/g; the solid to water mass ratio was 2 g/mL; the initial pH value was 3.0. Error bars represent standard deviations.
Mentions: The removal of the five tested estrogens in cow manure by Fenton oxidation was very fast during the first 6 h of the reaction (Table 6 and Figure 5). Over the 6 h period, 73.15%, 98.43%, 96.48%, 93.79%, and 68.61% of E3, BPA, DES, E2, and EE2 in cow manure was degraded. Extending the reaction time from 6 to 24 h led to lower residual concentrations and a higher removal efficiency of the test estrogens in cow manure. The removal efficiencies were 84.9%, 99.5%, 99.1%, 97.8%, and 84.5% for E3, BPA, DES, E2, and EE2, respectively, for a reaction time of 24 h. However, when the reaction time was prolonged from 24 to 72 h, the residual concentrations and removal efficiencies of the estrogens did not change significantly (Table 6 and Figure 5). As a consequence, 24 h is the optimum reaction time for the removal of test estrogens in cow manure by the Fenton oxidation technique.

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.