model of a heavy metal adsorption system using the s-layer ... · presented at the 2011 comsol...

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Presented at the 2011 COMSOL Conference in Boston Model of a Heavy Metal Adsorption System Using the S-Layer of Bacillus sphaericus

Juan Pablo Orjuela

Urban and Regional Sustainability Group Universidad de los Andes

Bogota - Colombia

Heavy metals and water

Bacillus sphaericus

Tunjuelito meets Bacillus sphaericus

Let’s model this!

• Single porosity model

• Langmuir’s Isotherm

Use of COMSOL Multiphysics

• 2D • Mass transfer module • Chemical Species Transport / chpm

Global parameters

• Experimental: – Langmuir – Time for saturation – Density – Porosity – Initial concentrations

• Literature: – Dm – E – Km

Geometry

Species transport in porous media

Results

Results II

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0

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0 500 1000 1500 2000 2500 3000 3500 4000

Ou

tflo

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hro

miu

m c

on

cen

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(m

g/l)

Time (s)

Lab results

Model

0

5

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0 500 1000 1500 2000 2500 3000

Ou

tflo

w c

hro

miu

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(m

g/l)

Time (s)

Lab results

Model

0

5

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0 200 400 600 800 1000 1200 1400 1600

Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

0

5

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30

0 200 400 600 800 1000

Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

Results II

-5

0

5

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20

25

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35

0 1000 2000 3000 4000

Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

0

5

10

15

20

25

30

35

0 1000 2000 3000

Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

0

5

10

15

20

25

30

35

0 500 1000 1500 2000

Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

0

5

10

15

20

25

30

0 500 1000Ou

tflo

w c

hro

miu

m c

on

cen

trat

ion

(m

g/l)

Time (s)

Lab results

Model

Conclusions

• The model shows some really good preliminary results

• 1-D analysis is a good option

• Particle size has a greater effect than inflow speed

• Relationship between surface area and diffusivity coefficient ?

• Scale-up?

Acknowledgements

• Civil and Environmental Engineering Department • Urban and Regional Sustainability Group • Chemical Engineering Department • Biology Department • Nathalia Flórez • Andrea García • Andrés Gonzalez

THANK YOU! Juan Pablo Orjuela jua-orju@uniandes.edu.co

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