April, 2017

Commercial Offer for Sewage Treatment

Plant of 25 KLD

Client Name: M/s Uflex Ltd

Noida,U.P.

Submitted by
Enhance Ecotech Solution
Pvt.Ltd
C-39 ,Vishwakarma Colony ,
Prahladpur Badarpur, New Delhi -
110044
E-mail:enhanceecotech@gmail.com
INDEX
 Highlights of proposed design
 Principle of waste treatment
 Stage wise process description
 Process flow diagram
 Design basis
 Technical specification
 Scope of supply
 List of exclusions
 Annexure I: General Commercial terms & conditions
 Annexure II: Equipment and Price Schedule (including stand-by pump)

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Enhance Ecotech Solution(P) Ltd(EESPL) a well known name in the field of Water &
Waste Water treatment. EESPL along with its technology collaborator for system have
enough expertise and strength to execute this project successfully.

The following is the detailed description of the proposed Sewage Treatment Plant and the
units in it.

1. HIGHLIGHTS OF PROPOSED DESIGN

The highlights of proposed technology and plant design are summarized as follows:

 Compact design.
 Proven technology.
 Optimum power requirement to achieve the required level of treatment.
 Minimized use of chemicals in the treatment plant.
 Consistently producing superior quality of treated sewage.
 Ease of operation and maintenance.
 Cost effective.

2. PRINCIPLE OF WASTE WATER TREATMENT

The general principle in wastewater treatment is to remove pollutants from the water by
getting them either to settle or to float, and then removing this material. Some pollutants
are easily removable. Others must be converted to a settle able form before they can be
removed. Treatment facilities are designed in stages. Each stage either removes particles
from the wastewater or changes dissolved and suspended material to a form that can be
removed. A modern wastewater treatment plant may include these stages:
 Influent
 Primary treatment
 Secondary treatment
 Tertiary treatment
 Disinfection and Sewage discharge

2.1 Influent

Influent is the raw material that has been collected and conveyed to the plant for
treatment. It includes all the water and debris that entered the collection system.

2.2 Primary Treatment

To prevent damage to pumps and clogging of pipes, raw wastewater passes through
mechanically raked bar screens to remove large debris, such as rags, plastics, sticks,
and cans. Screened sewage is passed through oil & grease chamber. The principal
of a rectangular separator is based on gravity settling of oil drops under reduced
velocity of phases & the floated oil can easily be collected & clear sewage is
transferred to equalization tank & trapped oil is sent for storage in drums. The lighter
organic solids remain suspended in the water and flow into large tanks,
called collection tank.

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 2.3 Secondary Treatment

The primary sewage is then transferred to the biological or secondary stage

(Attached growth process). Here, the wastewater is mixed with a controlled
population of bacteria and an ample supply of oxygen. The microorganisms digest
the fine suspended and soluble organic materials, thereby removing them from the
wastewater. The sewage is then transferred to secondary clarifiers, where the
biological solids or sludge are settled by gravity.

2.4 Tertiary Treatment

Tertiary, or advanced, wastewater treatment is the term applied to additional

treatment that is needed to remove suspended and dissolved substances remaining
after conventional secondary treatment. This may be accomplished using a variety of
physical, chemical, or biological treatment processes to remove the targeted
pollutants. Advanced treatment may be used to remove such things as color, metals,
organic chemicals, and nutrients such as phosphorus and nitrogen.

2.5 Disinfection

Before the final sewage is released into the receiving waters, it may be disinfected to
reduce the disease-causing microorganisms that remain in it. The most effective
processes use chlorine dosing disinfection.

3. STAGE WISE PROCESS DESCRIPTION

The detailed process of treatment scheme process is as under:

 Pre-treatment & pumping station

 Screen & separation chamber
 Equalization tank.
 Secondary treatment
 Moving Bed Bio Reactor (MBBR)
 Tube Settler
 Tertiary Treatment
 Sand filtration system
 Activated Carbon Filter
 Final Disinfection
 Chlorination System
 Sludge Treatment/ Handling
 Sludge Drying Bed

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3.1 Screening

Man-hole is provided at separate unit & raw sewage is collected there. The sewage
is passed through the screen, which is provided at inlet. To prevent damage to
pumps and clogging of pipes, raw wastewater passes through mechanically raked
bar screens to remove large debris, such as rags, plastics, sticks, and cans.

3.2 Equalization/Neutralization Tank

This tank shall collect the waste water from the oil & grease tanks at various intervals
to homogenize it completely

3.3 Primary Settling Tank

Tube settler settling media helps reduce the amount of suspended solids in carrier
fluids thus improving sewage quality significantly, which in turn improves the
efficiency of existing plants. Moreover, with Tube settler new clarification tanks can
be designed smaller and yet maintain the same performance level, at far less cost.
The use of Tube settler leads to the formation of large settling areas and small sink
paths. The Tube settler is easy to install in any shape of clarifier; its hexagonal
chevron shape settling with or without coagulation or flocculation is the most ideal for
effective settling with or without coagulation or flocculation.

High settling surface area (11 to 13m 2/m 3) leads to a very small clarifier size and the
detention time requirement is also very low when compared to conventional clarifiers.

3.4 Moving Bed Bio Reactor (MBBR)

The proprietary (Attached Growth Airlift Reactor)

technology is a result of more than a decade of intensive
multidisciplinary research and development. Integrating
Fixed Film and Suspended Growth technologies, it is
considered as the “next-generation” in biological
wastewater treatment methods. The MBBR technology
combines a unique fully open and fully protected biomass
carrier with a highly efficient aeration and mixing design.
This results in superior effective surface area for biomass growth and optimal oxygen
transfer efficiency.

The biomass carriers utilize superior hydrodynamic

design with highly open external surface that allows for
passage of water, oxygen and nutrients to the biofilm
located on the carriers’ interior.

The carriers have an effective surface area of 450m2/m3 and are made of High
Density Poly Ethylene (HDPE) that allows for extended carriers life expectancy.

The unique AGAR® Aeration design is using either fine or coarse bubble diffusers to
create a double role motion in the solution. The double role motion, create constant
collisions between the carriers and keeps a thin and viable bio-film on the carriers.
Thus, the AGAR® process is highly effective and maintenance free process. Due to
the unique aeration design, in most cases, no additional air is required for the rolling

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motion and air supplied to fulfill the biomass demands is sufficient for both biological
activity and mixing.

The AGAR family of solutions may be applicable to any type of biological process
upgrade, from existing oxidation ponds, through Attached Growth, to Activated
Sludge.

Biological reactor

The MBBR process utilizes attached growth solely and with no need of sludge
recirculation. The reactor with an operative volume of 11.00 m 3 will be divided into
two aerobic process stages for intensive BOD removal. Each stage will be filled with
biomass carriers which are mixed by airlift hydraulics using the process air supplied
through coarse bubble diffusers arranged on the basin floor.

A perforated plate screen will be installed at the outlet of each stage, in order to
maintain the carriers inside the reactor, whereas mixed liquor may flow unobstructed.
The screens are continuously cleaned by the mixing flow of water, air bubbles and
biomass carriers.

Design criterion

The design of criteria for MBBR is as follows for a stream:

 Total flow 25m3\day

 Total no of stream 1
3
 Design Flow for each stream 1.25 m /hr
 No. of stage(MBBR Reactor) 2
 Organic loading rate for MBBR 1-5kg BOD/m3 of reactor volume
 Effective specific surface area of Carrier 450 m2/m3

(I) BACTERIA: Bacteria are single celled prokaryotic organisms. Their usual mode of
reproduction is by binary fission. Generally a bacterial cell contains 80% water and 20% dry
material, out of which 90% is organic & 10% is inorganic.

(II) BIO CHEMICAL OXYGEN DEMAND:- (BOD) It is the demand of dissolved oxygen by
bacteria and other microbes in the bio- chemical oxidation of Organic matter.

(III) MIXED LIQUOR SUSPENDED SOLIDS:- ( MLSS) The suspended solids concentration is
the Aeration tank is referred as Mixes Liquor SS. It is an index of the mass of active micro
organisms in the Aerobic bio reactor tank. As illustrated before MLSS in aeration tank
indicates the presence of both active and dead bacterial cells. The level of MLSS that has to
be maintained depends upon the desirability of treated water quality.

(lV) FOOD TO MICROBES RATIO (F/M):- It is the ratio between amount of Organic material
available to microbial population. In other words it is the ratio between BOD in Kgs /MLSS in
Kgs.

(V) NUTRIENTS:- To continue reproduction & stabilization of organic matter, an organism

must have
(a) A source of energy.
(b) Carbon for the synthesis of new cellular material.
(c) Inorganic elements such as nitrogen, phosphorus, sulphur, potassium, calcium and
magnesium.

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 For deriving energy bacteria use light and other chemical reaction as a source. Carbon is
derived from organic matter and atmospheric CO2. Inorganic elements though are available
in Sewage, they are to be maintained in balanced proportion if found necessary. Hence
addition of urea and Di - ammonium phosphate is necessary to arrange for Nitrogen and
phosphorous availability. A generally recommended Nutrient ratio of BOD: N:P in 100:5:1.

Aerobic Bio Reactor Tank Function:- The main function of an Aerobic bio reactor tank in a
typical MBBR process can be listed as below:-
To maintain the dissolved oxygen concentration in the sewage by suitable aeration
mechanism.

* To maintain sufficient MLSS to take care of organic loads coming in sewage.

PROCESS DESCRIPTION: - The Organic waste introduced into the reactor where an aerobic
culture is maintained in suspension, and attached growth is maintained on fixed film
undergoes conversion. The aerobic environment in the reactor is maintained by diffused
aeration which also serves to maintain the mixed liquor in a completely mixed regime. After a
specified period of time the mixture of new cells and old cells is passed into the tube settler
tank where the cells are separated from the Sewage. A portion of the settled cells is recycled
(RAS) to maintain the desired concentration of organisms (MLSS) the reactor
Environmental Requirements to maintain a favorable condition in the bio reactor tank for the
bacteria to flourish are Temperature, Dissolved Oxygen and pH.

Temperature:- Optimal growth of micro organism occur within a fairly narrow range of
usually the temperature of Sewage shouldn’t be more than field temperature.

pH:- Most bacteria & other useful micro organism perishes if the pH is either above 9.5 or
below 4.0. Generally the optimum pH for bacterial growth his between 6.5 & 7.5.

3.5 SECONDARY SETTLING TANK

Tube settler settling media helps reduce the amount of suspended solids in carrier
fluids thus improving sewage quality significantly, which in turn improves the
efficiency of existing plants. Moreover, with Tube settler new clarification tanks can
be designed smaller and yet maintain the same performance level, at far less cost.
The use of Tube settler leads to the formation of large settling areas and small sink
paths. The Tube settler is easy to install in any shape of clarifier; its hexagonal
chevron shape settling with or without coagulation or flocculation is the most ideal for
effective settling with or without coagulation or flocculation.

High settling surface area(11 to 13m2/m3) leads to a very small clarifier size and the
detention time requirement is also very low when compared to conventional clarifiers.

3.6 CLEAR WATER TANK

In this tank clear water is subjected to tertiary treatment for further polishing of
sewage. It collects clear water from the secondary tube settler from where it is come
through gravity. After that it is passing through sand filter and activated carbon filter.

3.7 FILTRATION /ADSORPTION

The clear sewage from the above tank is passed through a series of Filtration, sand
and Carbon filter Column which serves the purpose of coarse and fine filtration /
removal to the residual and undesired suspended impurities.
Mechanical Dewatering of the sludge is contemplated after the thickening stage.
Poly électrolyte shall be dosed in order to get the dewatered sludge cake with a dry

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 solid concentration of 20% from the thickened sludge with dry solids concentration of
4%. 1 No (1 W) sludge dewatering equipment (filter press) designed to dewater the
day’s sludge in 16 hours of operation per day shall be provided. The Belt filter press
shall be mounted on an elevated platform so that the discharge of cake shall be
directly through conveyer system collected in a truck / trolley kept below dewatering
unit.

Flow diagram of sewage treatment plant

Raw sewage Screen Chamber

O & G Trap

Collection tank

MBBR-1&2 Reactor
Air Blower
S.R.L(MLSS)

Filter Press Tube settler

Filter Feed tank

PSF

ACF Treated water Tank

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4. DESIGN BASIS

4.1 Treatment Capacity

The Sewage treatment plant and recycling system is designed to treat 25 KLD of raw
sewage. The treated sewage shall be discharged into the drain at downstream side so
as to reduce the pollution load in the drain.

4.2 Characteristics of Incoming Sewage

The sewage characteristics considered for the design purpose of the plant as
mentioned in following table.

Parameter Unit Raw Comment

wastewater
3
Design flow m /d 25
3
Design flow m /h 1.25 After equalization

Design °C 16 / 35 Min. / Max.

Temperature
COD mg/l 500-600

BOD5 @ 20OC mg/l 300-350

TSS mg/l 300-400

NH4-N mg/l 36 Assumed by EES

TKN mg/l 50 Assumed by EES

Oil and Grease mg/l <10 Required by EES to be less

than 10 mg/l to be insured by
client
pH 5.5 - 9.0

4.3 Treated Sewage Quality:

The plant is designed to produce the following quality of treated sewage, averaged
over 18 hrs in the fully stabilized Plant running continuously.

Design criteria & Specifications of equipments

Parameters Inlet After ACF

BOD520 300-350 mg/L < 30 mg/L

COD 600-800 mg/L < 250 mg/L
TSS 300 mg/L < 100 mg/L
Oil & Grease 20-30 mg/L <10 mg/l
Ph 4-9 7.0-8.0

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 *The above quality treated sewage will be suitable for recycling and reuse purpose and can used
for the not potable purposes i.e. Washing, Flushing, and Irrigation etc. This will reduce the water
requirement of the society from municipality connection.

4.4 Proposed Process

The main treatment Units are as follows:

 Fine Screen (10mm) for removal of

suspended and floating debris equal or
greater
 Oil & Grease Tank
 Equalization Tank to cater peak & lean
flow
 Biological Treatment- Moving Bed Bio
Reactor(Two Stage)
 Secondary Clarification
 Tertiary Treatment and Disinfection unit
 Sludge Treatment
Overview of Packaged Mobile STP Unit

SCOPE OF SUPPLY OF EQUIPMENTS

S No. Item Specification MOC Make Quantity

1 Bar Screen SS-304 , with Manual SS-304 EES 01

scrapping 500x400 mm
2 Sewage Transfer Cap- 1.25m3/hr@10- SS Kirloskor/wilo 2 Nos.
Pump 12M
3 Air Diffusers 63mm x610mm EPDM Rehaue/ppaqu 1 lot
a/w2/p
4 Filter feed Pump 1.25m3/hr@30m head CI Kirloskor/wilo 1No.
/KSB
5 Pressure Sand 2 cum/hr MSEP EES 1No.
Filter
6 Activated 2 cum/hr MSEP EES 1No.
Carbon Filter
7 Sludge 1.25m3/hr@12m head, CI Kirloskar 2No.
Recirculation solid handling 8mm
Pump
8 MBBR media 19mmx22mm PVC/PP MM aqua 1 lot

9 Tube settler 750mm PVC MMaqua 1 lot

media
10 Air piping Class “C” MS Jindal 1lot

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11 Pipe & fitting Jindal MS Prince 1lot

12. Filter Press Suitable for 25KLD PP EES 1Lot.

13 Chlorine dosing 0-6LPH PP E-Dose 2No

system
14 Air Blower 35m3/hr@4000mmwg CI Everest/Airvac 1No.

15. Control Panel Suitable for 25 KLD MS with L&T 1No.

power component
coating
16. Compact Sewage Suitable for 25 KLD 6mm MS EESPL 1Set
Treatment Plant plate &
(MBBR ,Tube 2mmFRP
settler) lining
17. Filter Feed Tank Suitable for 25KLD 6mm MS EESPL 1Set
plate &
2mmFRP
lining

5. Exclusions

 Electricity and fresh water

 Pipes into the equalization tank and at the outlet of the plant
 Civil works and land preparation
 Equalization tank (with a volume of 30% of the daily flow)
 All civil jobs like Tanks, foundation and sheds etc.
 Electricity for erection, testing and commissioning will be provide on free of cost.
 Final discharge of treated sewage.
 Power supply within STP Plant.
 Any other item not mentioned above.

ANNEXURE – I
GENERAL COMMERCIAL TERMS & CONDITIONS
CUSTOMER NAME M/s Uflex Ltd

OUR PROPOSAL NO. PE306_25 KLD STP

DATE 12th April 2017

DELIVERY Ex-Works
Within 25 – 30 Days from the date of approval of
DESPATCH
GA drawings and receipt of advance.
VALIDITY 30 Days
 40% of the ordered value as an advance.
 40% of the ordered value before supplying all
TERMS OF PAYMENT
Mechanical Items at site.
 20% of the ordered value after Erection &

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 commissioning of the STP

EXCISE DUTY Nil

TAXES Extra

OTHER TAXES & DUTIES Extra as applicable

FREIGHT Extra
Twelve (12) months from the date of mechanical
GUARANTEE / WARRANTY commissioning of the equipment, whichever is
earlier

ANNEXURE – II
EQUIPMENT AND PRICE SCHEDULE

S. No. Description Total Price (Rs.)

Supply, installation, Testing and commissioning of

Complete Mechanical and Electrical Items with stand by
1 pumps as mentioned in the List Mechanical equipments of 13,80,000/-
the STP-25KLD.(Under our Scope of Supply)

Varun Singh
+91-9711411440

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