Role of biologic components in a novel floating-bed combining <italic>Ipomoea aquatic</italic>, <italic>Corbicula fluminea</italic> and biofilm carrier media

doi:10.1007/s11783-013-0587-z

Front Envir Sci Eng

2014, Vol. 8

Issue (2) : 215-225 https://doi.org/10.1007/s11783-013-0587-z

RESEARCH ARTICLE

Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media

Hailiang SONG^1,2, Xianning LI^1,2(

), Wei LI¹, Xiwu LU^1,2

1. School of Energy and Environment, Southeast University, Nanjing 210096, China; 2. Engineering Research Center for Water Environmental Protection of Taihu Lake, Southeast University Wuxi Branch, Wuxi 214135, China

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Abstract

A novel floating-bed incorporated with water spinach (Ipomoea aquatica), Asiatic clam (Corbicula fluminea), and carrier media supported biofilm was developed for eutrophic water purification. The contributions of each biologic component to the removals of total nitrogen (TN), total phosphorus (TP) and Chl.a were examined. The nutrient removals due to the direct uptake by either water spinach or Asiatic clam were less than 10%, suggesting a negligible role of biologic assimilation and leaving the biofilm as the indispensable biologic component in the floating-bed. Chl.a was reduced mainly by Asiatic clams via filter-feeding. Meanwhile, the digestion and excretion of Asiatic clams benefited the proliferation of nitrifying and denitrifying bacteria, resulting in the improvement of TN removal. In summary, the synergetic effects of water spinach, Asiatic clams and biofilms would promote the eutrophic water treatment performance of floating-bed in comparison with the conventional floating-bed with vegetation as the single biologic component.

Keywords floating-bed Corbicula fluminea biofilm carrier eutrophication

Corresponding Author(s): LI Xianning,Email:lxn@seu.edu.cn

Issue Date: 01 April 2014

Cite this article:

Hailiang SONG,Xianning LI,Wei LI, et al. Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media[J]. Front Envir Sci Eng, 2014, 8(2): 215-225.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0587-z
https://academic.hep.com.cn/fese/EN/Y2014/V8/I2/215

Fig.1 Schematic diagram of the ecological floating bed (VBA-FB) that involves vegetation, bivalve shellfish and artificial medium all in together

Fig.2 Configuration of the assembly carrier

Fig.3 Time course of TN concentrations in effluent from different mesocosms and removal efficiencies of floating-bed VBA-FB, VA-FB and BA-FB for TN

Tab.1 Changes in the biomass of water spinach and Asiatic clams contained in the floating-bed of VBA-FB

Fig.4 Mean concentrations of in effluent from different mesocosms and the corresponding removal efficiencies of floating-bed VBA-FB, VA-FB and BA-FB

Fig.5 Mean concentrations of NO3-N (a) and TOC(b) in effluent from different mesocosms and the corresponding removal efficiencies of floating-bed VBA-FB, VA-FB and BA-FB

Fig.6 Time course of TP concentrations in effluent from different mesocosms and the removal efficiencies of floating-bed VBA-FB, VA-FB and BA-FB for TP

Fig.7 Mean concentrations of Chl.a in effluent from different mesocosms and the removal efficiencies of floating-bed VBA-FB, VA-FB and BA-FB for Chl.a

Tab.2 The microbial biomass and dehydrogenase activity of the biofilm attached on the artificial medium in floating-bed of VBA-FB, VA-FB and BA-FB

Tab.3 The density of nitrifying and denitrifying bacteria attached growth on the artificial medium in floating-bed of VBA-FB, VA-FB and BA-FB

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