waste water treatment - electrooxidation
Post on 08-Oct-2014
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Electrochemical Technology
For water and wastewater treatment
Water & Wastewater treatment technology focused venture.
Engaged in:
• Research and Development of Electrochemical process based water and wastewater solutions.
• Development of Chemical free disinfection, sanitation and cleaning process for industries, hospitals, hotels and domestic applications.
• Development of Chemical free laundry and cleaning application.
Sector focus:
• Chemical, Pharmaceutical, Food processing and Dairy
• Medical and Hospitality industry
• Low cost water disinfection and sanitation in slums & rural areas
About XH2O Solutions
About Presentation
• Bottlenecks of conventional water treatment technologies
• De-bottlenecking water treatment with Electrochemical AOP
• Introduction to Electrochemical AOP reactor
• Reactions inside the Electrochemical reactor
• Case studies
• Comparison of Electrochemical AOP with other AOP process
• Complementary – not competing
Bottlenecks of conventional water treatment process
• Conventional methods include – Biological process, Membrane filtration, Carbon adsorption, Alum dosing etc.
• Conventional processes are unable to meet the complexity of present day chemical / organic treatment.
• Unable to remove color, bio-refractory organics, solvents, SS to required extent.
• Requires huge space and infrastructure.
• Long holding / retention times
• Sensitive to shock loads
• Capacity bottleneck – cannot be changed as and when needed
• Secondary issues like solid waste and concentrate generation
De-bottlenecking wastewater treatment using Electrochemical AOP
1. Electrochemical AOP system unselectively destroys organics in wastewater
2. Process generates no solid waste
3. Effective for destruction of bio-refractory organics
4. Effective for destruction of color
5. Improves the efficiency of Aerobic process, enhances methane generation in An-aerobic process.
Salient features:
a. Requires very less space
b. Can fit the existing process easily
c. Easily scalable
d. Distributed treatment possible
Efficient generation of mixed oxidant
ElectroOxidation reactor - Working principle
CETP wastewater
0
500
1000
1500
2000
2500
3000
0 1 2 3
Hour
CO
D (p
pm)
Ammonical Nitrogen and COD
RAW
EC EO –5hr
EO –9hr
EO – 12hr EO –15hr
NH3 removal
-1000
0
1000
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7000
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9000
0 5 10 15 20
Time
Amm
onic
al N
(ppm
)
COD
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10000
12000
14000
16000
0 5 10 15 20
Time
CO
D (p
pm)
Direct Dye wastewater
COD reduction
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1,000
1,500
2,000
2,500
3,000
3,500
4,000
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
Time (hours)
CO
D p
pm
Pesticide wastewater
Raw120 min
90 min
60 min
30 min
150 min
COD reduction
0200400600800
10001200140016001800
0 50 100 150 200
Time (min)
CO
D (p
pm)
Pesticide wastewater -2: High COD
Initial COD – 30,000 ppm
Final COD – 2200 ppm
Glycerol in 25% NaCl solution
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4500
Initial Final
TOC
(ppm
) pH Variation
0
2
4
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12
0 5 10 15
time (hr)
pH v
alue
Comparison of Electrooxidation with other Advanced Oxidation process
• Electrooxidaiton operates at neutral pH – as compared to other AOP process requiring acidic pH.
• Radicals in Electrooxidation needs no additional activators – as compared to Iron in fenton, peroxide in Ozonation.
• Electrooxidation activates inorganics like chloride, sulfate in wastewater to : generate secondary radicals – Other AOP are unable to generate such secondary oxidants.
• Most of the radical generation is in-situ, needing hardly any additional chemical storage.
• Operates at normal Voltages – unlike hundreds of voltage of Ozone generation.
Complementary to conventional process
A – Bio refractory organics
B – BOD
C – CO2
Combined Electrooxidation and Biological
treatment1. Making use of best of both worlds
2. Opens new avenues for Electrooxidation process
3. A unique solution to handle shock loads in biological system
concepts@xh2osolutions.com
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