Abstract
Contribution of image processing in monitoring the influence of nutrients on the growth of duckweed (Lemna minor). The growth of duckweed (Lemna minor) is an important component in the treatment process in wastewater floating macrophyte ponds. An excess or shortage of this biomass may be responsible for the dysfunction of such ponds. Modeling these duckweed ponds through mass balances based on Petersen's matrix may be helpful in facilitating the optimal management of such facilities. This study sought to assess the efficiency of digital image processing in the growth monitoring of Lemna minor under different concentrations of nitrogen and phosphorus. The experiments were carried out in a growth chamber (phytotron) using an experimental pilot involving initial fresh Lemna minor biomass (1 g), nitrogen and phosphorus concentrations varying between 5 and 64 mg N-NH4+·l-1, and 1 and 24 mg P-PO43-·-1, respectively. Digital image processing was achieved in addition to gravimetric methods (fresh weight and/or dry weight). Our results showed that the image processing method allowed a continuous and non-destructive monitoring of duckweed biomass. The growth of Lemna minor progressively decreased when nitrogen and phosphorus concentrations were greater than 16 mg N-NH4+·l-1 and 6 mg P-PO43-·-1. The maximum growth rates μmax were of the order of 0.07 d-1. The kinetic constants KS and KI were respectively 3.83 mg·l-1 and 204 mg·l-1 for nitrogen, and 1.26 mg·l-1 and 13.3 mg·l-1 for phosphorus. Such results are interesting as they could contribute to the optimal management of Lemna minor and the modeling of biological reactors.
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Claims 7
Claim · model-written summary
Digital image processing enabled continuous, nondestructive monitoring of duckweed biomass.
- Taxon
- Lemna minor
Lemna minort0 - Outcome
- continuous and non-destructive monitoring of duckweed biomasse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“image processing method allowed a continuous and non-destructive monitoring of duckweed biomass.”
t0“growth monitoring of Lemna minor”
Claim · model-written summary
Growth decreased above the reported nitrogen and phosphorus concentration thresholds.
- Taxon
- Lemna minorLemna minore0
- Treatment
- nitrogen and phosphorus concentrationse0
- Outcome
- growthe0
- Direction
- decreasede0
- Value
- 16 mg N-NH4+·l-1 and 6 mg P-PO43-·-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of Lemna minor progressively decreased when nitrogen and phosphorus concentrations were greater than 16 mg N-NH4+·l-1 and 6 mg P-PO43-·-1.”
Claim · model-written summary
Maximum growth rate was approximately 0.07 per day.
- Taxon
- Lemna minorLemna minort0
- Outcome
- maximum growth rates μmaxe0
- Direction
- maximume0
- Value
- 0.07 d-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum growth rates μmax were of the order of 0.07 d-1.”
t0“growth monitoring of Lemna minor”
Claim · model-written summary
Nitrogen KS was 3.83 mg per liter.
- Taxon
- Lemna minorLemna minort0
- Outcome
- KSe0
- Value
- 3.83 mg·l-1e0
- Qualifier
- nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The kinetic constants KS and KI were respectively 3.83 mg·l-1 and 204 mg·l-1 for nitrogen”
t0“growth monitoring of Lemna minor”
Claim · model-written summary
Nitrogen KI was 204 mg per liter.
- Taxon
- Lemna minorLemna minort0
- Outcome
- KIe0
- Value
- 204 mg·l-1e0
- Qualifier
- nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The kinetic constants KS and KI were respectively 3.83 mg·l-1 and 204 mg·l-1 for nitrogen”
t0“growth monitoring of Lemna minor”
Claim · model-written summary
Phosphorus KS was 1.26 mg per liter.
- Taxon
- Lemna minorLemna minort0
- Outcome
- KSe1
- Value
- 1.26 mg·l-1e0
- Qualifier
- phosphoruse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1.26 mg·l-1 and 13.3 mg·l-1 for phosphorus.”
t0“growth monitoring of Lemna minor”
e1“The kinetic constants KS and KI were respectively”
Claim · model-written summary
Phosphorus KI was 13.3 mg per liter.
- Taxon
- Lemna minorLemna minort0
- Outcome
- KIe1
- Value
- 13.3 mg·l-1e0
- Qualifier
- phosphoruse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1.26 mg·l-1 and 13.3 mg·l-1 for phosphorus.”
t0“growth monitoring of Lemna minor”
e1“The kinetic constants KS and KI were respectively”
The same questions in other papers
nitrogen · growth · Lemna minorPositive and negative results
1 in the opposite direction
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.