Dr. Sanjeev Gupta Grasim Industries Limited- Chemical Division International Conference on Sustainable Clean Ganga Mission 2015.

Hybrid bio-chemical approach for treatment of Industrial

Wastewater

Dr. Sanjeev GuptaGrasim Industries Limited- Chemical

Division

International Conference on Sustainable Clean Ganga Mission 2015

Suspended solid Dissolved solids

◦ Soluble organics◦ Inorganic salts

Inorganic/Organic colloids

Colour COD BOD Microorganisms Toxic Metals Oil & Grease…..

MAJOR CONCERNS WITH WASTWATER

Most of the industries in India are expanding their production capacity to cope-up the increasing demand of products with the same or marginally higher water permit.

The industries are facing the task of handling the increased organic load and pollutants concentration in the effluent which is treated in the existing biological process.

Different combinations of biological processes as well as pre or post chemical treatment are followed to meet the stringent discharge norms or reuse of the treated water.

Background

v1(Organic material) + v2O2 + v3NH3 +v4PO4

3-

Microorganisms

v5(new cell) + v6CO2 + v7H2O

5

Chemical Treatment

Pre-treatment Capacity augmentation to bioprocesses Removal of recalcitrant toxic compounds Consistent quality of wastewater to

biological process Stable and better operation of bio

processesPost Treatment 100% assurance to meet the required

discharge norms Removal of non-biodegradable compounds

from treated wastewater Suitable for recycling/ reuse

Seed sludge Secondary sludge from pulp and paper mill ETP Cow dung

Wastewater Combination

Materials

Substrate COD (mg/l) AOX (mg/l)

CD 200 15

EOP 190 5

WBL 330 -

Starch 100 -

Total 820 20

Industry:Pulp and Paper

8

Waste activated sludge

Flocculants

EffluentInfluent

Diffused aeration

Secondary clarifier

Air

Recycled sludge

Aeration basinPrimary clarifier

Primary sludge

Bar screen

s

Nutrients

Reactor Volume (l) Process HRT (h)

I 6.0 ASP 8.0

II A 9.5 LSB 12.0

IIB 6.0 ASP 8.0

IIIA 3.0 MBBR 4.0

IIIB 6.0 ASP 8.0

*Parameter

RI RIIA RIIB RIIIA RIIIB

ASP LSB ASP MBBR ASP

pH (outlet) 7.8±0.3 8.0±0.2 7.9±0.2 8.3±0.2 7.8±0.1DO (mg/l) 2.3±0.7 4.5±0.8 2.0±1.1 4.9±0.7 2.5±1.3HRT (h) 8.1±0.2 13.1±0.2 8.3±0.1 4.1±0.1 8.1±0.1

MLSS (g/l) 4.45±0.50 0.234 4.52±0.50 - 4.48±0.52

Organic (%) 84.1±0.8 - 79.3±1.0 - 79.7±0.6SVI (ml/g) 9±1 - 28±3 - 33±4CODout (mg/l) 257±26 337±39 232±14 373±31 240±31

CODs reduction (%) 66.3±3.0 53.0±3.1 69.2±1.5 49.4±3.4 68.6±3.5

Colour reduction 40.5±1.6 27.0±5.4 43.1±8.0 11.8 36.3±5.8

AOX reduction (%) 41.6±4.6 33.8±1.0 47.1 36.7±3.3 37.1±6.5

Inlet PH: 7.0; COD: 754±28; Colour: 1676±134; AOX:16.1±0.6

RI

RII RIII

Chemical Treatment with

Coagulant and Flocculant

Selection of Coagulant/ Flocculant Dissolve charge (Cationic/ anionic thrash)

Zeta Potential

Colloidal nature

Floc size

Mechanism of liquid solid separation

√ Direct filtration

√ Sedimentation

√ Diffuse air flotation

√ Centrifuge

√ Hybrid

Issues and contaminants Color

Turbidity

Resins

Suspended solids

Recalcitrant organic compounds

Non biodegradable COD & TOC

Microbial contamination }M

ostly Anionic in N

ature

Charge Type Example

Cationic Amine Polyethyleneamine

hydrochlorideQuaternary Polydiallyldimethylammonium

Nonionic Polyalcohol Polyvinylalcohol

Amide Polyacrylamide

Anionic Carboxylic Polymethacrylic acid

Sulfonic Polyvinylsulfonate

Inorganic Coagulants

Organic Coagulants

Poly Aluminum Chloride (PAC)

Poly Aluminum Chloro Hydroxide (ACH)

Alum

Flocculants

The flocculants are generally high molecular weight polymer compounds; may broadly be divided into three categories

Cationic

Copolymers of N,N-Dimethylaminoethyl Acrylate Methyl

Chloride Quaternary or N,N-Dimethylaminoethyl

Methacrylate Methyl Chloride Quaternary and acrylamide

Anionic

Copolymers of acrylamide and acrylic acid

Nonionic

Polymers of acrylamide

Colloidal material

Coagulated material

Flocculated material Settling

Flash Mixing

Mild Mixing

Sample LignoPAC (mg/l)

Anionic Flocculant

(mg/l)

COD (mg/l)

Colour (PCU)

Control - - 234 1050

Set-1 200 0.5 129 200

Control - - 260 1140

Set-2 250 0.5 89 180

Volume of sample treated: 5.0 l

Volume of sample treated: 5.0 l

SampleSludge

generation (mg/l)

Organic content

(%)

TDS (mg/l)

Calorific value

(kcal/kg)

Control - - 1720

Set-1 201 40.3 1480 2873

Control - 1810

Set-2 285 40.6 1505 2510

Sample LignoPAC (mg/l)

Al added(mg)

Sludge (g)

Al (mg)

Wastewater Sludge

Set-1 200 98 1.005 ND 84.2

Set-2 250 123 1.425 ND 107.3

Volume of sample treated: 5.0 l

22

Waste activated sludge

Flocculants

EffluentInfluent

Diffused aeration

Secondary clarifier

Air

Recycled sludge

Aeration basinPrimary clarifier

Primary sludge

Bar scree

ns

Nutrients

Plant scale Treatment

MBBR

DAF

Thanks Dr. Sanjeev GuptaAssistant General ManagerApplication support and product

DevelopmentGrasim Industries Limited- Chemical

[email protected]+91 8154007555