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| Study of Elodea nuttallii-immobilized nitrogen cycling bacteria restoration in an inflow river channel of water source, Taihu Lake |
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Abstract Nitrogen cycling bacteria, including ammonifying bacteria, nitrobacteria, nitrosobacteria and denitrifying bacteria were screened and immobilized to the porous carries from nature water of Jinshu Bay, Taihu Lake. The restoration effect of Elodea nuttallii-Immobilized Nitrogen Cycling Bacteria (INCB) assemblage technology applied in one of the inflow river channels of Jinshu bay water source, Taihu Lake was studied in autumn and winter. Lab ecological restoration simulation and in situ enclosure experiment demonstrated that Elodea nuttallii-INCB assemblage technology has better water quality improvement ability than either use INCB or Elodea nuttallii separately. We applied this technology in the inflow river channel water restoration and TN concentration reduced 5.9%~61.2%, NO3- concentration reduced 6.1%~68.0% and COD concentration reduced 4.2%~78.5% during the experiment process. The result also showed nitrogen bacteria quantities increased significantly after releasing INCB, and the MPN values of denitrifying bacteria in the enclosure was 3~4 order of magnitudes higher than the comparison water. There is significant difference between them (P<0.01). In situ enclosure experiment lasted for five months showed Elodea nuttallii-INCB assemblage technique can efficiently decrease inflow river nutrient loading and is helpful in water source eutrophication control in autumn and winter.
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Received: 04 July 2011
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