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Article

Eucalyptus Leaf Solution to Replace Metals in the Removal of Cyanobacteria in Wastewater from the Paper Mill Industry

1
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People’s Republic of China, Nanjing 210042, China
2
Chinese Academy of Forestry, Beijing 100864, China
3
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Hongyu Ren and Fanying Kong
Water 2021, 13(8), 1014; https://doi.org/10.3390/w13081014
Received: 2 March 2021 / Revised: 1 April 2021 / Accepted: 3 April 2021 / Published: 8 April 2021
(This article belongs to the Special Issue Applications of Algae for Wastewater Treatment)
The frequent occurrence of cyanobacterial blooms, caused by the eutrophication of water bodies, has triggered several ecological issues. Metal-controlled cyanobacteria are resulting in a series of secondary environmental problems and thus limiting environmental sustainability. Whether there is a more environmentally friendly way to replace metals in the removal of cyanobacteria is still unclear. To explore whether common heavy metals inhibit algal growth and whether Eucalyptus leaves (EL) can replace heavy metal ions in controlling algae outbreaks, here, we add Fe3+, Al3+, 3 mol/L of zinc (Zn3), 10 mol/L zinc (Zn10), and EL to a medium containing Cyanobacteria. We determine the medium’s color (456 nm), UV (254 nm), chlorophyll a, turbidity, temperature, pH, total dissolved solids, conductivity, and blue-green algae (BGA) at days 1, 4, 7, 11, 14, 19, and 21. We find that Fe3+, Al3+, Zn3, Zn10, and EL can inhibit chlorophyll synthesis, thereby impeding algae biomass growth due to metal ions’ disruption of the chlorophyll structure. The toxicity of Zn2+ may be higher than that of Fe3+ and Al3+ since it can completely destroy the structure of chlorophyll a. The damage of Zn (10) to chlorophyll a is stronger than that of Zn (3), indicating that high concentrations of metals have a stronger inhibitory effect on algae. The toxicity of EL to algae is lower than that of other metals, but it can significantly inhibit the growth of algae. We suggest the use of Eucalyptus leaves to inhibit algal growth in eutrophic water bodies. Our results provide a scientific basis for an environmentally friendly approach to controlling cyanobacteria outbreaks. View Full-Text
Keywords: metals; eucalyptus leaf; chlorophyll a; blue-green algae metals; eucalyptus leaf; chlorophyll a; blue-green algae
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MDPI and ACS Style

Hu, Z.; Jin, S.; Ying, R.; Yang, X.; Sun, B. Eucalyptus Leaf Solution to Replace Metals in the Removal of Cyanobacteria in Wastewater from the Paper Mill Industry. Water 2021, 13, 1014. https://doi.org/10.3390/w13081014

AMA Style

Hu Z, Jin S, Ying R, Yang X, Sun B. Eucalyptus Leaf Solution to Replace Metals in the Removal of Cyanobacteria in Wastewater from the Paper Mill Industry. Water. 2021; 13(8):1014. https://doi.org/10.3390/w13081014

Chicago/Turabian Style

Hu, Zhewei; Jin, Shu; Ying, Rongrong; Yang, Xiaohui; Sun, Baoping. 2021. "Eucalyptus Leaf Solution to Replace Metals in the Removal of Cyanobacteria in Wastewater from the Paper Mill Industry" Water 13, no. 8: 1014. https://doi.org/10.3390/w13081014

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