1. Global Significance of Substrates for Nitrate Removal in
Denitrifying Bioreactors Revealed by Meta-analysis
Yuchuan
Fan
(Postdoc)
Aug, 31 2022
Department of Soil, Water, and Ecosystem Sciences,
University of Florida

2. D O C U M E N T T I T L E |
S E C T I O N T I T L
Outline
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item
Media
Soil
Soil
Denitrifying bioreactor
NO3
-
Sand layer
Nitrate
-laden
N2
 Introduction
 Performance
 Mechanism
 Cost analysis

3. NO3
N2
N2
N2 N2
N2
NO3
NO3
NO3
NO3
D O C U M E N T T I T L E |
S E C T I O N T I T L
Denitrifying
bioreactor
(DNBR)
Question: Which filling material is better?

4. D O C U M E N T T I T L E |
S E C T I O N T I T L
Materials &
Methods
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

6. D O C U M E N T T I T L E |
S E C T I O N T I T L
Bioreactor
types
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

7. D O C U M E N T T I T L E |
S E C T I O N T I T L
Media
taxonomy
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

8. D O C U M E N T T I T L E |
S E C T I O N T I T L
Indicators
Where VT are influent water (m3), Nin and Nout are the inflow and
outflow nitrate concentrations (mg N L-1), VBR is the total volume
of the DNBR (m3), and t represents operation time (day).
NRR =
𝑉𝑇 𝑁𝑖𝑛 − 𝑁𝑜𝑢𝑡
VBR × 𝑡
NRE =
𝑁𝑖𝑛 − 𝑁𝑜𝑢𝑡
𝑁𝑖𝑛
(g N m-3 d-1)
(%)

9. D O C U M E N T T I T L E |
S E C T I O N T I T L
Performance
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

10. D O C U M E N T T I T L E |
S E C T I O N T I T L
Performance
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

11. D O C U M E N T T I T L E |
S E C T I O N T I T L
Performance
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

12. D O C U M E N T T I T L E |
S E C T I O N T I T L
Mechanism
Covered in this section:
Section Item | Section Item | Section
Item Section Item | Section
Item

13. D O C U M E N T T I T L E |
S E C T I O N T I T L
Cost
analysis
SubEcoi
=
NRRi
Pricei
(g N m-3 d-1)
($ m-3)
(g N $-1 d-1)

14. D O C U M E N T T I T L E |
S E C T I O N T I T L
Conclusions
 Our meta-analysis conducted a comparative assessment among
the substrate and indicated that nitrate removal (NRE & NRR)
in descending order were: NNC>MM>NC>IM.
 Our cost-effective index (SubEco) showed that woodchip and
corn cob was more economical than other NCs or NNCs.
 From a holistic review, we suggest MM as the optimum
material for nitrate removal due to the low cost and great
potential to make up media’s deficiencies.
Take home message:

15. D O C U M E N T T I T L E |
S E C T I O N T I T L
Questions
y.fan@ufl.edu
https://denitrifying-bioreactor.webnode.page