BY P.MD.RAFIMTECH (SVU)

COLOUR REMOVAL BY ADVANCED

METHODS

COLOUR REMOVAL

• Requirement to minimise environmental release of colour.

• Source of release of colour - incomplete exhaustion of dyes onto textile fibre

• Need to reduce the amount of residual dye in textile effluent - a major concern in recent years.

• An alternative approach to addressing the problem of colour - effluent treatment methods to remove colour.

• These methods - the cost of the overall process and some present the complicated - the possible toxicity of degradation products to be removed.

COLOUR REMOVAL

PHYSICAL METHODS• Different physical methods are also widely

used, such as membrane – filtration processes (nanofiltration, reverse osmosis, electrodialysis) and

• adsorption techniques.

COLOUR REMOVAL

CHEMICAL METHODS• Coagulation or flocculation combined with flotation and

filtration, precipitation-flocculation with Fe(II)/Ca(OH)2, electroflotation, electrokinetic coagulation, conventional oxidation methods, irradiation or electrochemical processes.

• Chemical techniques - expensive, and although the dyes are removed, accumulation of concentrated sludge - disposal problem.

• Recently, other emerging technique - advanced oxidation processes.

• Although these methods are efficient for the treatment of waters contaminated with pollutants, they are very costly and commercially unattractive.

COLOUR REMOVAL

BIOLOGICAL METHODS:• Biological treatment- most economical - when compared -

physical and chemical processes.

• Biodegradation methods- fungal decolourization, microbial degradation, adsorption by (living or dead) microbial biomass.

• Bioremediation systems - applied to the treatment of industrial effluents because many microorganisms such as bacteria, yeasts, algaes and fungi are able to accumulate and degrade different pollutants .

BIOREMEDIATION

MICROBIALREMEDIATIO

NPHYCOREMEDI

ATION

PHYTOREMEDIATION

AQUATIC PLANTS

TERRESTRIAL PLANTS

MYCOREMEDIATIONTYPES OF BIOREMEDIATION

COLOUR REMOVAL

PHYTO REMEDIATION:With particular importance to the textile

effluents which contain synthetic dyes.These compounds can be bioremediated using

plants which have been found to take up the dyes.

Most of the remediation techniques are much expensive & affect the ecological system negatively.

COLOUR REMOVAL

Plants - used to remediate such environmental contaminants - toxic & hazardous to the ecosystem.

Plants must be chosen - its unique uptake capacity to accumulate a particular dye,degrade it - either to utilise it in its metabolism or to release it as non toxic material.

response of the plants towards the textile dyes through phyto accumulation, phytosorption & phytodegradation.

PHYTOREMEDIATION METHOD

Phytoaccumulation:

Accumulation of the

contaminants by plants

Phytodegradation:

Degrading the toxic

contaminants by the

enzymes

Phytoremediation:

An ecofriendly solution for

environmental pollution using plants

Phytosorption:

Adsorption of contaminants

by dried plant

biomass

COLOUR REMOVAL

Plant surface morphology- important role in the phytoremediation process.

Accumulation & sorption of the dyes by the plant occur based on the porosity of the plants surface.

The dye molecules when accumulated or adsorbed by the plant biomass, enter the pores on the plant surface & block them.

COLOUR REMOVALPHOTO DEGRADATION:Textile industries produce large volume of

coloured dye effluents which are toxic & non biodegradable.

Photodegradation was carried out using TIO2 as photocatalyst.

The degradation of dye was carried out using different sources of energy, like solar radiation & microwave radiation.

COLOUR REMOVAL

Degradation of a photodegradable molecule - the absorption of photons, particularly those wavelengths found in sunlight, such as infrared radiation, visible light, and ultraviolet light.

Photodegradation - photodissociation, the breakup of molecules into smaller pieces by photons.

THAN Q