2.4 VENTAJA COMPETITIVA
2.4.3 Factores de Éxito Competitivo en las Mipymes
In order to calculate the total mass of DCD in the LII stream over 24 hours then the volume of water flowing down the stream in 24 hours first needs to be calculated.
Given a flow rate of 3.2 m3 s-1 (Clough et al. 2007), the volume (v) of water that flows down the LII
stream in 24 hours is:
v = (flow rate (m3 s-1) x1000) x time (s)
v = (3.2 m3 s-1 x 1000) x (60 s x 60 min x 24 hrs)
v= 3200 L s-1 x 86400 s day-1
v = 276,480,000 L day-1
Given a concentration of 1 mg DCD L-1 the mass of DCD (m DCD) in the LII per day will be:
m DCD = DCD concentration (mg L-1) x water volume (L day-1)
m DCD = 1 mg L-1 x 276,480,000 L day-1
m DCD = 276, 480,000 mg day-1
To convert this to kilograms:
m DCD = DCD mg day-1 x 1x10-6
m DCD = 276.5 kg day-1 (1 dp)
Therefore, at a constant concentration of 1 mg L-1 276.5 kg of DCD will pass down the LII stream in 24
hours.
To calculate how much DCD will be degraded in the LII stream in 24 hours then the DCD degradation rate in the ‘aerated+sediment+plant’ treatment (which is the most representative treatment of the LII) needs to be scaled up to encompass the entire stream.
Given that DCD degradation is dependent on sediment surface area and that the LII stream is 12 km long, an average of 13.5 m wide and 1.2 m deep with vertical sides (assumed), then the total sediment surface area (sa LII) in the stream is:
sa LII = 12,000 m x (13.5 m + (2(1.2 m)) sa LII = 190,800 m2
Each mesocosm had a diameter of 8 cm therefore the area surface of sediment contained in each (sa mesocosm) is:
sa mesocosm = πr2
sa mesocosm = π(0.04 m)2
sa mesocosm = 0.005 m2 (3 dp)
Given that the degradation of DCD followed a first-order exponential degradation curve and that the daily degradation constant (k) in the ‘aerated+sediment+plant’ was -0.005 and the initial mass of DCD in the mesocosm water was 3.77 mg, then the amount of DCD degradation that can occur daily in the LII (d DCD) is:
d DCD = (sa LII / sa mesocosm) x ((1 – e-0.005) x mg DCD)
d DCD = (190,800 m2 / 0.005 m2) x ((1 – e-0.005) x 3.77 mg)
d DCD = 713,731 mg day-1
d DCD = 713.7 g day-1 (1 dp)
Therefore of the 276.5 kg of DCD in the LII stream per day 713.7 g of DCD can be expected to be degraded. As a percentage of the total mass of DCD in the stream daily the amount of DCD degraded daily (d %) is:
d % = (d DCD / m DCD) x 100 d % = (0.7137 kg / 276.5 kg) x 100
d % = 0.26 %
Therefore of the total daily amount of DCD in the LII stream 0.26% of it can be expected to be degraded in 24 hours.
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