Application of our

products in Waste-water

treatment plant24th April’19

Syed Salman Mohiuddin (Blower & Vacuum

Division)

Today’s Content• Recitation of verses from Holy Quran

• CEO’s message & presentation

• Introduction to our company

• ETP Application

• Product Portfolio

• Q & A session

• Visit to our premises

• Group Photograph

• Prayers & Lunch

Introduction to Rastgar

Rastgar & Co. is a known name nationwide

apropos sales, marketing, technical & after-market

services of wide range of industrial air

compressors & allied pneumatic equipment. The

company leverages significant brand equity of

Compair through other products; radial

compressor, industrial blower, vacuum pump etc.

Introduction to Rastgar

ETP

Effluent treatment plant (ETP) is designed to

treat the industrial sewage and waste-water

to make it appropriate enough to release it

back to the environment safely by killing the

pathogens & clear the harmful chemicals,

toxins & extract the reusable water

(treatable) & other important substances

from the effluents.

ETP

According to central & provincial

Environmental & Protection agencies active

nationwide, there are more or less 1,500

process industries in all producing waste-

water that must be treated before disposing

off. While, 150-200 have effluent treatment

plants installed at their premises, with few of

them filtering it further for re-use in their

process.

Effluent (Textile)

Generally textile mills consume large volume

of water for various processes such as

sizing, de-sizing, & scouring, bleaching,

mercerization, dyeing, printing, finishing &

ultimately washing. In fact, in a practical

estimate, it has been found that 45%

material in preparatory processing, 33% in

dyeing and 22% are re-processed in

finishing.

Effluent (Textile)

Effluent (Tannery)

Leather tanning in Pakistan creates heavy

metals (chromium, cadmium etc.), various

organic chemicals & acids. The sample of

tannery effluent contains Cu 0.30 mg/l,

Cadmium 0.15 mg/l, Zn 7 mg/l, Ni 1.14 mg/l

& Pb 1.8mg/l.

ETP Steps

Preliminary Treatment

Preliminary devices are designed to remove or cut up the

larger suspended and floating solids, to remove the

heavy inorganic solids, and to remove excessive

amounts of oils or greases.

Following devices are commonly used:

1. Screens -- rack, bar or fine

2. Comminuting devices -- grinders, cutters, shredders

3. Grit chambers

4. Pre-aeration tanks

ETP Steps

Primary Treatment

Purpose of primary treatment is to reduce the velocity of

the wastewater sufficiently to permit solids to settle and

floatable material to surface.

Primary devices may consist of settling tanks, clarifiers

or sedimentation tanks.

ETP Steps

DAF (Dissolved air floatation)

DAF system is preferably used for primary treatment to

remove the contaminant load in textile & tannery

industries.

The removal is achieved by dissolving air in the water or

wastewater under pressure and then releasing the air at

atmospheric pressure in a flotation tank or basin. The

released air forms tiny bubbles which adhere to the

suspended matter causing the suspended matter to float

to the surface of the water where it may then be removed

by a skimming device.

ETP Steps

Advantages of DAF (Dissolved air floatation)

• Efficient at removing particles and turbidity resulting in

more economical filter designs.

• Allow for short detention times (5-10 min) in

flocculation tanks.

• Can use higher hydraulic loading rates than most

settling processes.

• More efficient at removing floc particles than most

settling processes.

• More efficient than sedimentation in removing low-

density floc formed from coagulation of TOC.

ETP Steps

Advantages of DAF (Dissolved air floatation)

• Allows for lower coagulant dosages resulting in

smaller chemical storage and less sludge.

• Smaller footprints with stacked flotation over filtration

arrangement.

• Improved algae removal and cold water performance.

• Less sensitive to flow variations.

• Process flexibility through air loading

ETP Steps

Empty aeration tank

ETP Steps

Filled aeration tank

Compact Treatment Plant

Construction

CTP unit is composed of a circular outer shell and

concentric inner tank. The outer tank acts as an aeration

tank, while the inner one acts as Settlement Tank.

A baffle wall in the annulus space of each CTP unit is

provided to ensure that the influent completes the full

circle before being admitted into the inner settlement

tank via specially designed pipe work.

ETP Steps

Compact Treatment Plant

ETP Steps

ETP

To have a recognized brand name.

To have the right technology as blowers, pumps. (Market

was still related to traditional technologies)

To have the right price but not yet much affected by

many competitors

AND, OF COURSE

To have a good sales team able to offer a product

package (not just blowers but also diffusers, dosing

pumps, analyzer, probe)

AND - A Complete maintenance & After Sales package

To be in the waste water treatment, up to 15

years ago, meant..

Rastgar - Celar

Water-treatment services

• Reverse Osmosis Systems

- Brackish water RO

- Sea water RO

- Double pass RO

- CIP

• Sewage Treatment Plant

- Submerged aeration fixed film (SAFF)

- Fluidized Media Bio Reactor (FMBR)

- Membrane Bio Reactor (MBR)

- Grey Water Treatment

- Extended Aeration System

• Filtration System

- Micro / Ultra filtration system

Water-treatment services

• Ultraviolet System

• Components

- Vessels

- Pumps

- Filters

- Valves

- Instrumentation & Control etc

Water-treatment services

Reverse Osmosis

Sewage TreatmentSewage treatment, or domestic wastewater treatment, is

the process of removing contaminants from wastewater

and household sewage, both runoff (effluents) and

domestic. It includes physical, chemical, and biological

processes to remove contaminants. The objective of the

treatment plant is to produce a waste stream (or treated

effluent) and a solid waste or sludge suitable for

discharge or reuse back into the environment. This

material is often inadvertently contaminated with many

toxic organic and inorganic compounds.

Sewage Treatment

Media Filters are used to reduce the level of suspended

solids like clay, organic matter, algae and other

microorganisms in water. These filters are highly

effective in removing sediments that are 5-15 microns in

size or even larger.

Media Filtration Systems:

• Carbon Filter

• Green Sand Filter

• Multi Media Filter

• Pyrolox Filter

Filtration System

Filtration System

Mechanicals

Application in WWTP

1. Lobe blowers for air bubbles degritting systems

2. Lobe blowers + screw compressor for air bubble

oxidation systems

3. Blowers for sand filters backwash systems

4. Centrifugal pumps on sludge

Blowers

Side-channel blowers

Side-channel blower

accessories

Side-channel blower

accessories

Roots lobe blowers

Roots lobe blowers

Axial & Centrifugal fan

• They are designed to meet either standard

applications or special working conditions.

Our fans can be built both in fabricated

steel or special alloys, according to

customers specifications. The working

range is from 50 to 1,000,000 m3 of flow,

with working pressure between 0.5mbar &

500mbar. The wing profile of impellers

grant higher efficiency.

Axial & Centrifugal fan

Diffusers

• Membrane Disc & Tubular Diffusers

Designed to meet either standard

applications or special working conditions.

- Oxygen range: 25-40%

- Diameter: 250, 320, 350 mm

- Length: 300, 600, 1,000 mm

Diffusers

Activated sludge treatment

versus air/O2 demand

Qa (flow rate): We can offer a package able to follow the

air need (variable Qa). Means an integrated Electrical

panel with VSD??

> Plug and play configuration.

e (compressor efficiency). Can we use a high efficiency

technology instead of blower technology.

> Low pressure screw.

Service & After market

We offer the most comprehensive sales &

service network in the industry.

We have in place a highly competent & well-

trained service team capable of meeting our

customer’s service requirements from A to

Z.

Our state-of-the-art workshop & service

center are equipped with latest technology

to ensure quality & timely services.

Water Treatment Seminar

On: 18th June’19

Venue: Ramada Plaza

Speaker: Mr. Lawrence Al Halabi (International

Sales & Services Mngr, CELAR)

Speaker: Mr. Ramiz Nino (Authorized

representative of Becker & IVACO in ME)

ETP

Thank You!

• SALES • SOLUTIONS• SPARES• SERVICE