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

Fariha AroojFariha AroojAnd And Irfan AhmadIrfan AhmadPhD Project, Punjab University, Lahore, PAKISTANPhD Project, Punjab University, Lahore, PAKISTAN

AOP Based Cotton Bleaching

Who are we?

Introduction

AOP Research Group

•

•

Under the Supervision of:

AOP Research Group

Working on:

Domestic wastewater

Textile Wastewater

Tannery Wastewater

Pulp and paper Wastewater

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.

THANKING YOU