Treatment of Textile Industrial Wastewater

TREATMENT OF TEXTILE INDUSTRIAL WASTEWATER FROM WATER JET LOOM MACHINE

Khanittha Charoenlarp Rajamangala University of Technology KrungthepThailand.

Introduction

The textile industry is a very diverse and broad manufacturing sector.

Yarn production. Fabric production. Finishing. Fabrication.

Yarn production

carding spinning

Fabric production

Weaving

Knitting

Finishing

Bleaching Dyeing

Printing Finishing

Fabrication

Introduction

Weaving is one of the primary methods of textile production.

It involves interlinking a set of vertical threads with a set of horizontal threads.

Weaving loom

Conventional loom

rapier loomAir jet loom Water jet loom

Water jet loom

Water jet loom

Advantage Wide variety of

fiber and yarn types.

Widely used for apparel fabrics.

Decreasing of noise.

Decreasing of damage yarn.

Disadvantage High amount of

wastewater. Wastewater

contaminate with oil and sizing agent.

Introduction

This sizing agent Polyvinyl alcohol Acrylic Lubricant substances

The oily wastes Objectionable odors Undesirable

appearance Toxic Limits oxygen

transfer

W astewater T reatment inTextile Industry

Biological treatment Dissolved air floatation Coagulation-flocculation Membrane process

Coagulation Flocculation Chemical coagulants cause formation of

a sludge phase that can be separated by density difference.

Major coagulants: Al2(SO4)3.14H2O (Alum) FeCl3.6H2O Fe2SO4

Destabilization

Electro-coagulation Defined:

Similar to Chemical

Coagulation

Destabilize Charged Particles

Physical Removal (Settling)

Electro-coagulation can remove a wide range of pollutants at the same time:

suspended solids dyes emulsion organic matters heavy metals

Objective

I nvestigating the efficiency of the me thod for treatment of wastewater fro

m water jet loom machine by compar ison between chemical coagulation a

nd electrocoagulation.

Method

Analysis of wastewater from jet loom machine

Chemical coagulation experiment Electrocoagulation experimental

1. Analysis of wastewater from jet loom machine

• The weaving wastewater from jet loom machine in Chonburee Province, Thailand was used in this study.

• The properties of wastewater to be analyzed were turbidity, suspended solid (SS), total solid (TS), oil content and chemical oxygen demand (COD).

Measurements

pH

conductrometer

turbidimeter

Measurements

Dissolved solid and suspended solid

2. Chemical coagulation experiment

The influence factors of the chemical coagulation condition Type and amount of coagulant Type and amount of coagulant aids pH Stirring rate

Chemical coagulation Parameter

Condition Value

10% aq of coagulant (mL)

1.0,2.0,3.0,4.0,5.0 and 6.0

0.1% aq of coagulant aids (mL)

1.0,2.0 and 3.0

pH 4,5,6,7,8, and 9

Rapid stirring rate (rpm)

100, 120 and 150

Slow stirring rate (rpm) 30,60,90,120,150 and 180

3. Electrocoagulati

onExperimental

Electrocoagulation parameter

Condition Value

Electrode material

Al and Fe

Electric potential (V)

20,25,30 and 35

Contact time (min)

30,60,90,120,150 and 180

Results

Properties of wastewater from water jet loom machine.

Parameter mean SD Standard Value

pH (25oC) 7.5 0.2 5.5-9

Turbidity (NTU) 188.7 4.1 -

COD (mg/L) 1601.1

317.5

120

SS (mg/L) 157.0 12.0 <50

TS (mg/L) 2969.0

98.6 <3000

Oil content (mg/L) 571.8 64.8 5.0

The influence factors of chemical coagulation

F-test at 0.05 level of significance.

Type and amount of coagulant, type and amount of coagulant aids, pH of solution and stirring rate were affected significantly with the efficiency of turbidity removal.

Effect of type and amount of coagulants

() 10% w/w aq Aluminum sulfate ( ) 10% w/w aq Ferrous sulfate () 10% w/w aq Ferric chloride

88%

Effect of pH

Effect of type and amount of coagulant aids

() 10%w/w aq aluminium sulfate + 0.01%w/w aq anionic polymer () 10%w/w aq aluminium sulfate + 0.01%w/w aq cationic polymer

Effect of stirring rate

Effect of stirring rate

The influence factors of electrocoagulation

F-test at 0.05 level of significance.

Electrode materials, Electric potential, and contact time were affected significantly with the efficiency of the turbidity removal.

Effect of electrode materials

() Aluminium electrode () iron electrode

The effect of electric potential and contact time

() 20V ()25V ()30V (x)35V

Conclusions

The significant influence on the treatment efficiency of chemical coagulation.

The type and amount of coagulant The type and amount of coagulant aids Initial of pH Stirring rate

Conclusions

The significant influence on the treatment efficiency of electrocoagulation.

Electrode material Electric potential Contact time

Optimum condition of chemical coagulation method

10% w/w of aluminum sulphate 80 mL and 0.01% w/w of cationic polymer 32 mL per 4 L of wastewater.

The mixture solution was rapidly stirred with 120 rpm for 1 min and then slowly stirred with 20 rpm for 20 min.

The removal efficiency of turbidity, COD and oil content were 89%, 85% and 71%, respectively.

Optimum condition of electrocoagulation method

Aluminum electrode with 35 volts and 150 min of contact time.

The removal efficiency of turbidity, COD and oil content were 99%, 97% and 87% respectively.

Acknowledgement

The authors would like to thank Rajamangala university of Technology Krungthep for the financial support and also grateful to Assist.Prof. Dr. Waraporn Tanakulrangsarn and Assist.Prof. Puangmanee Tantiwong for theirs valuable comments and suggestions.

Thank you for your attention