Nitrogen Removal of Polyvinyl Alcohol(PVA) Gel Embedded With Nitrifying/Denitrifying Bacteria Coupled With Plant

To explore effect of polyvinyl alcohol(PVA) gel embedded with nitrifying/denitrifying bacteria in remedying ecology of eutroficated waterbody, a 21-day N-removal experiment was conducted using the gel coupled with two species of plants (Oenanthe clecumbensand Ipomoea aquatica). Results show that the concentration of TN, NH₄⁺-N, NO₃^--N, NO₂^--N and TP in the group added with bacteria was significantly lower than that in the group without bacteria, respectively（P<0.05）. Correlation analysis shows that nitrogen removal efficiency in the experimental groups was significantly and positively related to the addition of nitrifying bacteria and denitrifying bacteria embedded in PVA Gel(P<0.05). The mean growth rate of Oenanthe clecumbensand Ipomoea aquatica was 38.5 and 19.6 mg·g^-1·d^-1, respectively, in the experimental group added with the gel（R_GR）and 29.9 and 9.5 mg·g^-1·d^-1, respectively. in the group without the gel.