biosorption studies of acid green 3 dye
TRANSCRIPT
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Biosorption Studies of Acid Green 3 Dye
Martine Torres Department of BioResource Research Oregon State University
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Physical Water
Scarcity Approaching Physical Water
Scarcity Economic Water
Scarcity Little/ No Water
Scarcity Not Estimated
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Background
• Textile industry uses 80-200 m3 of water per ton of product
• Producing 1,650 m3 of wastewater per day
• In 2008, global textile production was more than 66 million tons of fabric, consuming 6-9 trillion liters of water
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Adverse Effects From Dye Effluent
• Negatively affect photosynthetic activity of aquatic life
• Textile dyes discolor water, making it aesthetically unappealing
• Health effects include allergic dermatitis, skin irritations and cancer
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Input/Raw Materials →→ →→ Processing Steps → →→→→→ Output
Textile Fibers →→→→→→ Yarn Manufacturing →→→→→→ Yarn
(Spinning Mill)
↓
↓
Yarn→→→→→→→Fabric Manufacturing→→→→→Grey Fabrics
(Weaving/Knitting Industry)
↓
↓
Grey Fabrics→→→→→→Wet Processing →→→→→Finished Fabrics
(Dyeing, Printing & Finishing Industry)
↓
↓
Finished Fabrics→→→→ →Garment Manufacturing→→→→→ Garments
(Garment Industry)
Source: http://textilelearner.blogspot.com/2012/02/what-is-textile-basic-textiles-uses-of.html#ixzz1w17tFwQr
Flow Chart of Textile Processing:
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Economic Water
Scarcity Little/ No Water
Scarcity Not Estimated
Physical Water
Scarcity Approaching Physical Water
Scarcity
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Bangladesh
•Garment industry contributes 80% of foreign exchange earnings
•Industrial pollution accounts for 60% in Dhaka watershed
•Groundwater supply drinking water for 80% of Dhaka population
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India
•Textile industry employs 38 million people, largest source of industrial employment
•Water scarcity is so severe in Tirupur, industries are forced to buy water
•Discharged effluents are detectable in the food chain in Sanganer
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Textile Industry Is Not Sustainable
Groundwater sources are going to be depleted
Water costs will increase
Textile production costs will increase
Growing need for new technology
Recycle wastewater Reduce pollution
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Current Technology
Torres 2012
•Current technologies to treat textile effluent include, reverse osmosis, oxidation, and activated carbon
• These methods suffer from high energy demand, high cost, slow dye removal process and hazardous by products
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Dead Biomass
• Not affected by toxic waste, does not require continuous nutrient supply
• Can be recycled and accumulates contaminants better than living cells
• Examples include banana peels, coconut husks, charcoal and algae
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•Red macro-algae, Palmaria mollis
•Brown macro-algae, Fucus vesiculosus
•Biochar, Red Alder char
Focus of Our Study
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Palmaria mollis
Fucus vesiculosus
Algae
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Biochar
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Red Alder Char
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Acid Green 3 (AG3) as Model Dye
• Acid dyes are commonly used in the textile industry
• Most difficult type of dye to treat
• Anionic triphenylmethane dye main offenders of pollution
• Animal carcinogen and promotes tumor growth in fish
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Binding Group
Structural Formula
Hydroxyl -OH
Carboxyl -C=O
I
OH
Sulfonate O
II
-S=O
II
O
Amine -NH2
Alginic Acid
Major Binding Groups for Biosorption
Agar
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Collection and Pretreatment of Algae
• P. mollis and F. vesiculosus were collected at the Hatfield Marine Science Center
• Algae was treated with distilled water and 0.1M HCl
• Algae was dried in an oven and ground to less than 2mm size using a knife mill
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• Biosorption: The property of biomass to bind
and concentrate selected ions or other
molecules from aqueous solutions
Vocabulary
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Hypothesis
• Algae and biochar can be used as an effective adsorbent for AG3 dye
Torres 2012
Objectives • Determine the
optimum pH, temperature and salinity conditions for maximum dye adsorption
• Conduct batch experiments to determine dye adsorption potential
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Palmaria mollis
• Initial batch experiments conducted were to determine optimum pH for adsorption
– pH influences functional groups on algae and the dye solution chemistry
• Palmaria mollis will adsorb AG3 dye better in an acidic environment (pH2-3)
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Methods: P. mollis
Experiment 1: Determine Optimum pH Condition
pH: 2-7
30°C
1g/L dye in 150mL dye solution
0.5g P. mollis
Duration: 27 hours
*Only graphed pH 2, 3, 6 and 7
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Results: Palmaria mollis
Effect of pH on Dye Adsorption Rate by P.
mollis
0
10
20
30
40
50
60
0 15 30 45 60 90 150 210 330 450 570 1440 1500 1560 1620
Time (min)
Dye
Ad
sorb
ed
by
Alg
ae (
%)
pH2 pH3
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Effect of pH on Dye Adsorption Rate by P. mollis
0
2
4
6
8
10
0 15 30 45 60 90 150 210 330 450 570 1440 1500 1560 1620
Time (min)
Dy
e A
dso
rbe
d b
y A
lgae
(%
)
pH6 pH7
Results: Palmaria mollis
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Discussion
• P. mollis effectively adsorbs AG3 dye at pH2 (52.8%) and pH3 (42%) compared to pH 4-7 (>10%)
• Adsorption rate decreases with increasing pH
• As pH increases, the number of negatively charged sites on algae increases
• P-value comparing adsorption rate of pH2 and pH3 was (0.14), so subsequent experiments use pH3
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Fucus vesiculosus
• Switched focus to brown macro-algae
• Two experiments were conducted:
– Determine optimum salinity condition
– Determine optimum temperature condition
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Methods: F. vesiculosis
Experiment 1: Determine Optimum Salinity Condition
Dye Conc.: 2.5g/L 5g/L 10g/L
Salt Distilled Media: water water
Salt Distilled water water
Salt Distilled water water
pH: 3
30°C
20g P. mollis
Duration: 8 hours
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Results: Salinity Experiment (10g/L)
Effect of Salinity on Dye Adsorption Rate by F.
0%
10%
20%
30%
40%
50%
60%
70%
0 30 60 90 120 240 480
Time (min)
Dye
Ad
sorb
ed
by
ALg
ae
(%
)
Dye Adsorbed (Dist. Water) Dye Adsorbed (Salt Water) P-value: 0.0125
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100% 68.3% 62.5% 60.1% 58.5% 40.1% 39.8%
Percent Dye Remaining for 10g/L in Salt Water With a Dilution Factor of 100
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Results: Salinity Experiment (5g/L)
Effect of Salinity on Dye Adsoprtion Rate by F.
0%
10%
20%
30%
40%
50%
60%
70%
0 30 60 90 120 240 480Time (min)
Dye A
dso
rbed
by A
lgae
(%)
Dye Adsorbed (Dist. Water) Dye Adsorbed (Salt Water) P-value: 0.0168
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Results: Salinity Experiment (2.5g/L)
Effect of Salinity on Dye Adsorption Rate by F.
0%
10%
20%
30%
40%
50%
60%
70%
0 30 60 90 120 240 480
Time (min)
Dy
e A
dso
rbe
d b
y A
lga
e (
%)
Dye Adsorbed (Dist. Water) Dye Adsorbed (Salt Water)
Torres 2012
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Methods: F. vesiculosis
Experiment 2: Determine Optimum Temperature Condition Temperature: 30°C 35°C 40°C
2.5g/L 10g/L Salt water
2.5g/L 10g/L Salt water
Dye Conc.: 2.5g/L 10g/L Type of Media: Salt water
pH: 3
20g P. mollis
Duration: 8 hours
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Results: Temperature Experiment
Effect of Temperature on Final Dye Concentration
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
30 35 40
Temperature (°C)
Fin
al D
ye
Con
cen
trat
ion
(g/L
)
2.5g/L Initial Dye Concentration 10g/L Initial Dye Concentration
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Discussion
• Temperature (30-40°C) does not significantly affect dye uptake by the algae
• Dye uptake appears to be associated with salinity of the solution
• Total amount of dye adsorbed by algae was independent of initial dye conc. (56-57% for distilled water, 44-60% for salt water)
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Biochar • Studies indicate that chars
formed at low temperatures (300-400°C) have lower surface area than chars at high temperatures (500-700°C)
• Red Alder at 600°C will adsorb AG3 dye better than Red Alder at 300°C
• Determine optimum pH for adsorption
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Collection and Pretreatment of Biochar
• Donated from Mr. John Miedema in Philomath, Oregon
• One batch of high and low temperature Red Alder Char was washed with distilled water and 0.1M HCl
• Treated Char was then dried in an oven before use
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Untreated Char 600°C Treated Char 600°C -pH: 3, 5, 7
-Media: 2.5g/L Dye in Salt Water
-Samples taken at
4 hrs and 24 hrs
-pH: 3, 5, 7
-Media: 2.5g/L Dye in Salt Water
-Samples taken at
4 hrs and 24 hrs
Untreated Char 300°C Treated Char 300°C -pH: 3, 5, 7
-Media: 2.5g/L Dye in Salt Water
-Samples taken at
4 hrs and 24 hrs
-pH: 3, 5, 7
-Media: 2.5g/L Dye in Salt Water
-Samples taken at
4 hrs and 24 hrs
Methods
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Results
High Temp Char Untreated
0
5
10
15
20
25
30
35
0 240
Time (min)
AG
3 D
ye U
pta
ke (
%)
pH7 pH5 pH3
240 1440
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Results High Temp Char Treated with
0
2
4
6
8
10
12
0 240
Time (min)
AG
3 D
ye U
ptake (
%)
pH7 pH5 pH3
240 1440
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Discussion
• High temperature Red Alder char adsorbs more AG3 dye than low temperature
• No significant pH difference for Red Alder char to adsorb AG3 dye
• Treated char adsorbed less dye (11%) than untreated char (32%)
• Red Alder char adsorbed less AG3 dye than P. mollis and F. vesiculosus
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Future Work
Effluent water (high volume)
Clean wash water (lower volume)
Operating
Operating
Regeneration
Regeneration
Clean effluent water (No dyes)
Wash water (Dyes
concentrated)
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Acknowledgements
• Oregon State University Subsurface Biosphere Initiative (SBI)
• United States Department of Agriculture (USDA) • Gail Hanson and John Meidema for providing the
biomass used in the experiments • Dr. Murthy for supporting my research • Dr. Kleber and Dr. Stubblefield • Wanda and Dr. Field • My friends and roommate