›› 2018, Vol. 30 ›› Issue (1): 150-158.DOI: 10.3969/j.issn.1004-1524.2018.01.20

• Environmental Science • Previous Articles     Next Articles

Glucose enrichment to control Microcystis (cyanobacteria) bloom under high nutrient level

WANG Xiaodong, LIU Xingguo, LU Shimin, CHE Xuan, ZHU Hao, LIU Chong, ZHU Lin   

  1. Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Fishery Machinery and Instrument Research Institute, Chinese Academy of Fisheries Sciences, Shanghai 200092, China
  • Received:2017-05-26 Online:2018-01-20 Published:2018-02-09

Abstract: In order to control cyanobacterial Microcystis bloom, an experiment with glucose enrichment was carried out under high nutrient level with 5 L glass bottles in greenhouse. There was a control of no glucose enrichment (Control) and a treatment with glucose enrichment (+Glu), each with 3 replicates. The initial water for the experiment was severely Microcystis bloomed, in which the chlorophyll-a (Chl-a) concentration was 422.78 μg·L-1. The glucose enrichment was according to the total nitrogen concentration, and with the dissolved organic carbon to total nitrogen ratio (DOC∶TN) ≈ 20∶1. During the experiment, every bottle was aerated with an air stone. The results showed that, the Chl-a, dissolved oxygen and pH values both at 09∶00 A.M. and 14∶00 P.M. in the treatment were all significantly lower than those in the control (P<0.05), and the DOC, total suspended solids (TSS) and organic suspended solids (OSS) concentrations in the treatment were all significantly higher than the control (P<0.05). And there was no significant difference in the total nitrogen (TN), total phosphorus (TP), dissolved total nitrogen (DTN), dissolved total phosphorus (DTP) and soluble reactive phosphorus (SRP) contents between the control and the treatment (P>0.05). Then the discovery for the phytoplankton under microscope showed, with the elongation of the experiment, the Microcystis colonies became smaller with fewer cells both in the control and the treatment, and the Microcystis colonies in the treatment became much smaller, even with morphology in two cells or unicell. The results indicated that, glucose enrichment can control Microcystis bloom, and the mechanism was that organic carbon improved the growth of heterotrophic microorganism, which competed nutrients with Microcystis.

Key words: cyanobacteria, Microcystis, glucose, algal bloom control, biofloc

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