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Effect of Black Wattle ( Acacia mearnsii) Extract on Blue-Green Algal Bloom Control and Plankton Structure Optimization: A Field Mesocosm Experiment

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A field mesocosm experiment was conducted at the Three Gorges Reservoir to investigate the utility of black wattle extract in controlling blue algal blooms. The mesocosm experiment was divided into two parts: (1) a short-term test to evaluate how black wattle extract inhibits algal blooms in an emergency and (2) a long-term test to evaluate how black wattle extract maintains water quality and prevents algal blooms over a 1-year period. In the short-term test, the results showed that 3 to 4 mg L−1 black wattle extract could reduce algal biomass in 1 week, whereas serious algal blooms occurred in the untreated control mesocosm. More importantly, the long-term test suggested that black wattle extract played a significant role in plankton structure optimization at lower concentrations of 1 to 2 mg L−1. In this test, phytoplankton diversity increased, with the dominant species shifting from cyanobacteria to diatoms and other algae. Meanwhile, as water quality improved through the presence of plant extract treatment, the numbers of smaller zooplankton decreased and larger species increased. Therefore, this investigation founded a novel nature plant agent that not only has good effects on algal bloom control, but also restores the aquatic ecosystem.

Keywords: algal bloom; algal inhibition; aquatic ecosystem; black wattle extract; cyanobacteria

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143012X13418552642083

Affiliations: 1: Architecture & Environment College, Sichuan University, #24 South First Ring Road, Section No.1, 610065 Chengdu, P.R. China; telephone/facsimile: +86 0288540-3087; 2: Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, P.R. China 3: Division of Development and Planning, Guangxi University, Nanning, P.R. China

Publication date: December 1, 2012

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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