Fariha Urooj Ph.D. Scholar, Wastewater Treatment Lab, Directorate of Research and Development, Punjab University. Topic A Novel Approach for Bleaching Cotton A Novel Approach for Bleaching Cotton Substrate including Surgical Cotton Substrate including Surgical Cotton
Fariha Urooj . Ph.D. Scholar, Wastewater Treatment Lab, Directorate of Research and Development, Punjab University. Topic A Novel Approach for Bleaching Cotton Substrate including Surgical Cotton. AOP Based Cotton Bleaching. Fariha Arooj And Irfan Ahmad - PowerPoint PPT Presentation
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Fariha Urooj
Ph.D. Scholar, Wastewater Treatment Lab, Directorate of Research and Development,
Punjab University.
Topic
A Novel Approach for Bleaching Cotton Substrate A Novel Approach for Bleaching Cotton Substrate including Surgical Cotton including Surgical Cotton
This is a State of the Art Lab with Leading Edge Technology Solution Primarily purpose is simple:
To Solve the Problems Faced by the Industry !
Up-Flow Anaerobic Sludge Blanket Reactor
Recent PhD Project
A New Washing-Off Method for Reactive Dyeing of Cotton
In Collaboration with Thies-Germany
Other Activities in Wastewater Treatment Research Lab:
Trainings Consultancy Research Waste Treatment / Analysis Water Analysis Etc.
Achievements
Name Date of Approval
Approved by Patent No
Method and device for dyeing a textile substrate
12.11.2008 International Patent Office
WO 2008138282
European Patent office
EP1990456
IPO (Germany) DE102007022265
IPO (Japan) JP 2008280666
IPO (Korea) KR 20080099824
IPO (China) CN 101302722
Industrial Plant by M/S Thies Germany
Sr. No. Author Year Title of Paper Name of Publishing Journal
1 F.R.Shah, Ahmad, N. K.R. Masood and D.M. Zahid
2008 The influence of cadmium and chromium on the biomass production of shisham (Dalbergia Sissoo Roxb.) Seedings.
Pakistan Journal of Botany
2 Akhtar, M. Ahmad, N. and Booij, M.J.,
2008 The impact of climate change on the water resources of Hindukush-Karakorum-Himalaya region under different glacier coverage scenarios.
Journal of Hydrology
3 Akhtar, M. Ahmad, N. and Booij, M.J
2008 Use of regional climate model simulations as input for hydrological models for the Hindukush-Karakorum-Himalaya region.
Hydrology and Earth System
Science Discussion
4 Qazi, M.A., Ahmad, N. Akram, M.
2008 Economical and environmental implication of solid waste compost application to agricultural fields in Punjab, Pakistan:I Rice-Wheat Cropping System.
Waste Management
5 Qazi, M.A., Ahmad, N. Akram, M.
2008 Economical and environmental implication of solid waste compost application to agricultural fields in Punjab, Pakistan:II, Cotton-Wheat Cropping System.
Waste Management
Publications
Sr. No.
Author Year Title of PaperName of
Publishing Journal
6 Yasar, A. Ahmad, N. Latif, H. and Khan, A.A.A.
2007 Pathogen Re-growth in UASB effluent Disinfected by UV, O3, H2O2, and
Advanced Oxidation Processes.
Ozone-Science & Engineering
7 Yasar, A., Ahmad, N. Chaudhry, M.N. and Khan, A.A.A.
2007 Sludge granulation and efficiency of phase separator in UASB reactor treating combined industrial effluent
Journal of Environmental Sciences-
China
8 Yasar, A., Ahmad, N. Chaudhry, M.N. Rehman, M.S.U., and Khan, A.A.A.
2007 Ozone for color and COD removal of raw and anaerobically biotreated combined industrial wastewater.
Polish Journal of Environment
al Studies
9 Yasar, A., Ahmad, N. Khan, A.A.A., and Yousaf, A.
2007 Decolorization of CL-BR Blue dye by AOPs using bleach Wastewater as Source of H2O2
Journal of Environmental Sciences-
China
10 Qazi, M.A. Ahmad, N. and Akram, M.
2007 Integrated Nutrient Management for Wheat by Municipal solid waste manure in Rice-wheat an cotton-wheat cropping systems.
Polish Journal of Environment
al Studies
Advanced oxidation can be defined as a process in which the oxidative capacity of a parent compound is
modified to make oxidation- reduction reactions more rapid and complete
by generating hydroxyl radicals.
What is AOP?
Oxidizing ReagentOxidation Potential
(eV)
Fluorine 3.06
Hydroxyl radical 2.80
Nascent oxygen 2.42
Ozone 2.07
Hydrogen Peroxide 1.77
Perhydroxyl radical 1.70
Hypochlorous acid 1.49
Chlorine gas 1.36
Major types of AOPsMajor types of AOPs
H2O2
UV Process
Fenton Process
Ozonation
UV/ H2O2
O3 /H2O2
O3 /UV
O3 /H2O2 /UV
Photocatalysis
AOP Based Cotton Bleaching
Green solution….
Conventional Bleaching
Consumption of high energy
Longer treatment time
Extensive use of chemicals like surfactants, stabilizers, peroxide killers etc.
Highly alkaline effluent requires neutralization.
High environmental loads resulting from waste water
Storage problems
Treatment and disposal cost
processing at low temperature
No by products & reduces effluent load
Less acid is required for neutralization
Shorter treatment times
No use of chemicals
Less energy consumption
Higher oxidation potential
Benefits of AOP Bleaching
Objectives
To develop an AOP based cost-effective and efficient technology for the bleaching of cotton fabrics.
To optimize the process by studying various parameters such as pH, time, temperature etc.
To evaluate the impact of AOPs on the quality of bleached fabrics.
To make a comparison between the conventional and AOP based bleaching of cotton.
Quality of Bleached Fabric
The quality of fabric is assessed by: Whiteness Absorbency Dye uptake Bursting Strength Degree of Polymerization Extent of Chemical Modification in
terms of Copper number
Materials and Methods
100% cotton, single jersey, knitted fabric having 180 gsm (grams per squared meter) was used.
The bleached samples were measured for whiteness index using spectrophotometer SF 500 by data color.
The color difference (∆E) values of the dyed samples were determined using the 1976 CIE L*, a* and b* (CIELAB) equation.
The fluidity of cotton fabric was measured according to AATCC test method 82-1996.
The fehling test was used to assess the chemical damage to cellulose
Characteristics of bleached fabrics
Types of bleaching
WI, CIE
Absorbency (sec)
Copper no
Bursting strength
DP COD ppm
TDS
ppm
Conventional bleaching
63 2-3 0.12 594 2474 4640 2730
AOP Bleaching 62 2-3 0.19 590 2199 120 340
Results and Discussion
Conventional Vs AOP bleaching
0
500
1000
1500
2000
2500
3000
3500
4000
4500
conventional bleach bath
Cha
ract
eris
tics
of b
leac
h ba
th
COD
EC
TDS
Turbidity
Conventional Bleach Bath AOP Bleach Bath
Dyeing behaviour of AOP bleached fabrics
00.20.40.60.8
11.21.41.6
1 2 3 4 5 6
Number of dyed fabrics
∆E C
IE L
AB U
NITS
Conclusion
The present report reveals that the grey cotton fabric can be bleached using AOPs to achieve the desired degree of whiteness with minimum damage to cellulose in a short time period.
The AOP bleaching has several advantages including elimination of scouring processes, savings in energy and chemicals, and no effluent loading.
Future Study
We intend to extend these processes to bleach surgical cotton for future research.