CIESC Journal ›› 2016, Vol. 67 ›› Issue (5): 2048-2055.doi: 10.11949/j.issn.0438-1157.20151445

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Kinetic modelling of total phosphorus removal in landscape type and vegetable type horizontal subsurface-flow constructed wetlands

YIN Zhiping, WU Yifeng, LÜ Xiwu   

  1. School of Energy & Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2015-09-14 Revised:2015-11-10 Online:2016-05-05 Published:2015-11-23
  • Supported by:

    supported by the National Science and Technology Support Program (2013BAJ10B13).

Abstract:

The studies on total phosphorus (TP) removal in landscape type and vegetable type horizontal subsurface flow wetlands were conducted. The raw water was domestic sewage which has been treated by biochemical treatment processes. The TP removal efficiency of different wetland units were compared and analysed. To optimize the design of wetlands, the first order reaction kinetics model and the Monod model were used to simulate the TP removal results and their accuracy were compared. Meanwhile, the relationship between water temperature, hydraulic loading rate (q) and the reaction coefficients were discussed. The results showed that in landscape type wetlands, the order of TP removal capacity was canna unit >thalia dealbata unit >iris tectorum unit, while it was water spinach unit >zizania unit >tomato unit in vegetable type wetland units, which was attributed to the biomass difference of different plants. The comparative evaluation between the first order kinetics model (ME: 0.53—0.72) and the Monod model (ME: 0.76—0.86) showed that the Monod model had higher accuracy in predicting the TP removal results. Decreased values of areal removal efficiency of TP were observed at lower water temperature. The Kmax of canna (θ=1.006), thalia dealbata (θ=1.008) and water spinach units (θ=1.006) were insensitive to the change of water temperature. The water temperature had a great influence on TP removal efficiency of iris tectorum (θ=1.015) and zizania (θ=1.014) units. The increased values of Kmax20 were observed at higher q values. The power equations (R2: 0.657; 0.805) can well reflected the relationship between Kmax20 and q. The constructed Monod model, which had considered the influence of water temperature and q on Kmax, gave a certain accuracy in predicting TP removal of experimental wetlands.

Key words: landscape type, vegetable type horizontal subsurface flow wetlands, total phosphorus, kinetic model, constructed Monod model, optimal design

CLC Number: 

  • X171

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