| 【Objective】The effect of ecological ditch of different three-dimensional plant combinations on nitrogen
and phosphorus removal under different influent flow was studied to provide reference for the construction of the field
ecological ditch.【Method】The removal efficiency of nitrogen and phosphorus in water by different plant combinations-C1
(Thalia dealbata-Pistia stratiotes-Echinodorus major) and C2 (T. dealbata - Eichhornia crassipes-Hydrilla verticillata)
and different influent flow treatments was studied by using an indoor ecological ditch simulation device.【Result】The
removal efficiency of nitrogen and phosphorus in water by different plant combinations and different influent flow treatments
was different. The results showed that the low influent flow rate (60 L/h) was beneficial to plant growth and had a good effect
on nitrogen and phosphorus absorption in water. At this flow rate, the total nitrogen removal rates of C1 and C2 were 36.74%
and 34.91%, the ammonia nitrogen removal rate was over 97%, and the total phosphorus removal rate was over 95% after
26 days of test operation. The concentrations of total phosphorus and ammonia nitrogen reached the Class Ⅱ and Ⅰ water
quality standards of national surface water environmental quality standards, respectively.【Conclusion】Under differentinfluent flows, the biomass growth of C2 was higher than that of C1, but the absorption of nitrogen and phosphorus by C1 was
higher than that of C2 and the removal effect was better. |
