Application of Hydrogen Peroxide to the Control of Eutrophic Lake Systems in Laboratory Assays

Toxins

Letizia Bauzá¹  Anabella Aguilera³  Ricardo Echenique²  Darío Andrinolo¹ 

[1] Cátedra de Toxicología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 48 y 115, La Plata 1900, Argentina; E-Mails:;División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n°, La Plata 1900, Argentina; E-Mail:;INBIOTEC-CONICET y CIB-FIBA, Vieytes 3103, Mar del Plata 7600, Argentina; E-Mail:

关键词: cyanobacteria;    coliforms;    chemical oxygen demand;    hydrogen peroxide;    lake management;    Planktothrix agardhii;   

DOI  :  10.3390/toxins6092657

来源: mdpi

【 摘 要 】

We exposed water samples from a recreational lake dominated by the cyanobacterium Planktothrix agardhii to different concentrations of hydrogen peroxide (H₂O₂). An addition of 0.33 mg·L⁻¹ of H₂O₂ was the lowest effective dose for the decay of chlorophyll-a concentration to half of the original in 14 h with light and 17 h in experiments without light. With 3.33 mg·L⁻¹ of H₂O₂, the values of the chemical oxygen demand (COD) decreased to half at 36 and 126 h in experiments performed with and without light, respectively. With increasing H₂O₂, there is a decrease in the total and faecal coliform, and this effect was made more pronounced by light. Total and faecal coliform were inhibited completely 48 h after addition of 3.33 mg·L⁻¹ H₂O₂. Although the densities of cyanobacterial cells exposed to H₂O₂ did not decrease, transmission electron microscope observation of the trichomes showed several stages of degeneration, and the cells were collapsed after 48 h of 3.33 mg·L⁻¹ of H₂O₂ addition in the presence of light. Our results demonstrate that H₂O₂ could be potentially used in hypertrophic systems because it not only collapses cyanobacterial cells and coliform bacteria but may also reduce chlorophyll-a content and chemical oxygen demand.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.