Simultaneous removal of harmful algal blooms and microcystins using microorganism- and chitosan-modified local soil

Article English OPEN
Li, H ; Pan, G (2015)

Cyanobacterial harmful algal blooms (cyano-HAB) and microcystins (MCs) can cause potential threat to public health. Here, a method for simultaneous removal of cyano-HAB and MCs was developed using chitosan modified local soil (MLS) flocculation plus microorganism modified soil capping. The experiment was conducted in simulated columns containing algal water collected from Lake Taihu (China). More than 90% algal cells and intracellular MCs were flocculated and removed from water using chitosan-MLS and the sunk flocs were treated by different capping materials including Pseudomonas sp. An18 modified local soil. During 40 days’ incubation, dissolved MC-LR and MC-RR showed 10-fold increase in the flocculation only system. The increase of MC-LR and MC-RR in water was reduced by 30% and 70% in soil capping treatments, however, the total content of MCs in the sediment-water column remained similar with that in the control and flocculation only systems. In contrast, both dissolved MCs and total MCs were reduced by 90% in Pseudomonas sp. An18 modified soil capping treatment. The high performance of toxin decomposition was due to the combined effects of flocculation and MCs-degrading bacteria that embedded in the capping material, which prevents dilution of bacteria biomass, concentrates the algal cells, confines the released toxins, and enhances toxin biodegradation.
  • References (42)
    42 references, page 1 of 5

    (1) Paerl, H. W.; Otten, T. G. Blooms Bite the Hand That Feeds Them. Science 2013, 342 (6157), 433-434.

    (2) Otten, T. G.; Xu, H.; Qin, B.; Zhu, G.; Paerl, H. W. Spatiotemporal Patterns and Ecophysiology of Toxigenic Microcystis Blooms in Lake Taihu, China: Implications for Water Quality Management. Environ. Sci. Technol. 2012, 46 (6), 3480-3488.

    (3) Magalhães, V. F.; Marinho, M. M.; Domingos, P.; Oliveira, A. C.; Costa, S. M.; Azevedo, L. O.; Azevedo, S. M. F. O. Microcystins (cyanobacteria hepatotoxins) bioaccumulation in fish and crustaceans from Sepetiba Bay (Brasil, RJ). Toxicon 2003, 42 (3), 289-295.

    (4) Chen, W.; Song, L.; Peng, L.; Wan, N.; Zhang, X.; Gan, N. Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions. Water. Res. 2008, 42 (3), 763-773.

    (5) Song, L.; Chen, W.; Peng, L.; Wan, N.; Gan, N.; Zhang, X. Distribution and bioaccumulation of microcystins in water columns: A systematic investigation into the environmental fate and the risks associated with microcystins in Meiliang Bay, Lake Taihu. Water. Res. 2007, 41(13), 2853-2864.

    (6) Paerl, H.; Otten, T. Harmful Cyanobacterial Blooms: Causes, Consequences, and Controls. Microb. Ecol. 2013, 65 (4), 995-1010.

    (7) Poste, A. E.; Hecky, R. E.; Guildford, S. J. Evaluating Microcystin Exposure Risk through Fish Consumption. Environ. Sci. Technol. 2011, 45,(13), 5806-5811.

    (8) Barrington, D. J.; Reichwaldt, E. S.; Ghadouani, A. The use of hydrogen peroxide to remove cyanobacteria and microcystins from waste stabilization ponds and hypereutrophic systems. Ecol. Eng. 2013, 50, 86-94.

    (9) Tang, Y.; Zhang, H.; Liu, X.; Cai, D.; Feng, H.; Miao, C.; Wang, X.; Wu, Z.; Yu, Z. Flocculation of harmful algal blooms by modified attapulgite and its safety evaluation. Water. Res. 2011, 45 (9), 2855-2862.

    (10) Ghernaout, B.; Ghernaout, D.; Saiba, A. Algae and cyanotoxins removal by coagulation/flocculation: A review. Desalin. Water. Treat.2010, 20,(1-3), 133-143.

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    132
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    Institutional Repository - IRUS-UK 0 132
Share - Bookmark