zero liquid discharge for the industrial...

Zero Liquid discharge for the Industrial sector

byAmit Udgirkar

Sr. ManagerEnvironmental Engineering

Praj Industries Ltd

Major Concerns. . .

Where is the space for process plant???

Reduce Foot Print

Recycle & Reuse of Treated Wastewater

somewhere???

Can I use treated wastewater

somewhere???

Major Concerns. . .

Major Concerns. . .

Zero Liquid Discharge (ZLD)

Can I avoid liquid discharge???

Major Concerns. . .

Energy Recovery & Maximization of Energy Efficiency

Can I generate/save energy???

WaterWater& &

WastewaterWastewaterSolutionSolution

Solution. . .

Integrated Design Approach

Selection of Appropriate Technologies

Solution under one roof

Zero Discharge usage in Industry

How to Achieve ZLD. . .

Recovery of solvents by using distillation Process

Effluent after Solvent recovery

STEP 1


Removal of Organic Matter by Using Anaerobic Digestion

Raw Effluent from Industry

STEP 2


Removal of Balance Organic Matter by Using Aerobic Digestion

AnaerobicallyTreated Effluent

STEP 3


Clarification by using, tube settler/Clariflocculator

Treated Effluent from ETP

STEP 4


Further Reduction in TSS by using Filters

Effluent after Clarification

STEP 5


Reduction in Turbidity and SDI by using Ultra Filtration

Effluent after Filters

STEP 6


Recovery of low TDS Permeate by using RO

Effluent after UF

STEP 7


Concentration of RO Rejects by using battery of evaporators

High TDS Rejects from RO

STEP 8


Separation of salts from Mother Liquor using centrifuge / dryer

High TDS Rejects from RO

STEP 9

• High Recovery through RO to reduce load on Evaporation

system

• Highly Corrosive Effluent

• Material Compatibility at Higher Temperature

• High Capital Investment

• Operating Cost for the treatment

• Turnkey Responsibility

Key Challenges in ZLD. . .

How to Address the Challenges

High Recovery through RO

- Use of Proper & robust Pre-treatment- Right Selection of Membranes and RO Configuration- Use of Proper & robust Pre-treatment- Right Selection of Membranes and RO Configuration

Material Compatibility at Higher Temperature

- Operate Evaporation System at low temperature- Operate Evaporation System at low temperature

- Use various combination of Evaporators- Use various combination of Evaporators

High Capital Investment

Operating Cost for the treatment

- Use innovative approach like TVR or MVR- Use innovative approach like TVR or MVR

Solutions…..

Conventional Falling Film Evaporator

Forced Circulation Evaporator

Forced Falling Film Evaporator

Fluidized Bed Patented Evaporator

Falling Film …

STEAMSTEAM

COND.

FEED

VAPORS

Falling Film - Features

Better Heat Transfer Coefficient.

Low Power consumption .

Can be started up quickly and changed tocleaning mode .

Useful in heat sensitive chemical solutions

Falling Film - Limitations

Not suitable at higher suspended solid concentration and higher viscosity.

Distribution system is critical and can lead to tube fouling in absence of adequate wetting rate.

Frequent C.I.P. Required .

Force Circulation

FEED

CONC. PRODUCT

CONDENSATE

STEAMVAPORS

Force Circulation - Features

Capable of handling Suspended slurry, Saturated solution & viscous liquids.

Can be operated with min temperature differences between the heating media and the boiling liquid.

No frequent Scale inside the tubes.

Can be installed vertically as well as horizontally.

Force Falling Film

SHOWER NOZZLEDISTRIBUTOR

LIQUOR Tube WallFILM

Condensed Steam

Or Vapor On Outside

Wall Of Tube

LIQUOR

VAPOR

LIQUOR IN

FALLING FILM UPPER MAIN LIQUOR BOX

Force Falling Film – Features

All advantages of conventional falling filmEvaporation.

Comparatively less problem of tube wetting rate dueto Spraying Nozzles.

Less prone to fouling as compared with ConventionalFalling Film Evaporator.

• Flubex – As an alternative to Forced Circulation or in Combination

Flubex- Concept

Recirculating fluidized bed heat exchanger

Evaporation by Flashingin Vapor LiquidSeparator.

Fluidizing medium inTube.

• Flubex – As an alternative to Forced Circulation or in Combination

• Flubex – Advantages

• Continuous self-cleaning action avoid scaling.

• No Frequent C.I.P.

• Less generation & disposal problem of C.I.P. Effluent.

• No standby unit required.

• Lesser floor space.

• Flubex – Installation

• MEE – Installation

• Distillation followed by Forced Circulation Evaporator based on MVR Technology - Installation


• MEE for Textile Effluent at Veerapandi, TN


Cilion Inc. USA

Swan Hill Ethanol Co ltd, Australia

Biowanze S.A., Belgium

Thai Sugar Ethanol Co ltd, Thailand

Profex Bio Products Ltd, Bulgeria

Bannari Amman, TN

EID Parry, TN

Shaw Wallace Gelatines Ltd, Jabalpur India

Cadburys India Ltd

Orchid Pharma

Gujrat Ambuja, India

Unicorn Organics Ltd, India

Benzochem, India

Other Technologies

Ammonia Stripping

Solution Under One Roof

More than 500 references in 50 countries

Sustainable solution for Sustainable Environment

[email protected]

[email protected]

Web: www.praj.net

zero liquid discharge for the industrial...

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