This document provides information about Thanbee Print World Ltd., including its address, year of establishment, facilities, production capacity, manpower, and effluent treatment plant (ETP). Some key details include: - It was established in 2008 and has a production capacity of 250,000 pieces per day. - It has various printing facilities and a manpower of 2,450 employees. - The ETP was established in 2016 and has a biological treatment process with a capacity of 500 cubic meters per day and a manpower of 8 people.

1. Company Profile-
Thanbee Print World Ltd.
A Concern of DBL Group
Address
Sardagonj, Kashimpur, Gazipur
Phone
Tele: +880-2-7790075-77,
Fax: +880-2-7790063
Effluent Treatment Plant (ETP)
of

2. Factory Location
Sardagonj, Kashimpur, Gazipur,
Bangladesh
Year of Establishment
2008
Printing Facilities
• Auto Circular Machine – 16
Pcs.
• Digital Auto Oval Machine -
02 Pcs.
• Auto Oval machine- 1, IQ oval
Machine-2 pcs
• CNC & High-density Printing
Machine – 3 set.
• Manual Print Machine - 10
Pcs.
• Pad Printing Machine-3 pcs
• Printing Table -3500 feet.
Business Activity
100% Export Oriented Printing
Project
Capability of Printing Items
Rubber, Pigment, Discharge,
Puff, Plastic-sol, Foil, Crack,
Gel, High-Density, Reflective,
Barn out, Dark in the glow,
Metallic, Flock, etc.
Total Manpower
2450 Persons
Production Capacity
250,000 Pcs. Per day.
( Avg. Printing)
THANBEE PRINT WORLD LTD.
Company Overview

3. Thanbee Print World Ltd. Was established in the year of 2008 to full fill the
demand of Placement print support of DBL Group. To full fill the increasing
demand of Garment Printing it has started it’s new journey with its
Expansion Unit in 2017.
TPWL-1 TPWL-Expansion
Company History

4. ETP (Effluent Treatment Plant)
ETP: Effluent Treatment Plant or ETP is wastewater treatment method is
particularly designed to purify industrial waste water for its reuse and it’s
aim is to release safe water to environment from the harmful effect
caused by the effluent.
Wastewater Treatment Plant: A treatment plant that reduces, alters, or
eliminates pollutants in wastewater discharges prior to the release of the
water into water receiving bodies. Wastewater treatment plants may be
privately owned and operated by the enterprise creating the wastewater,
or they may be owned and operated by a private or public third party. A
wastewater treatment plant may also be called an effluent treatment
plant (ETP).
The objectives of wastewater treatment are:
• i. Ensure discharge of good water quality to the natural environment.
• ii. Remove pollutants most efficiently and at the lowest cost.
• iii. Avoid and/or minimize other environmental impacts -odor creation,
gas emission and solid disposal.
• iv. Produce treated water for reuse and recycling.

5. Wastewater: Water no longer considered usable for a given operational purpose that
is directly or indirectly discharged from the supplier.
High pollutant printing sources
concentrations
• Pastes, urea, starches, gums, binders,
acids, thickeners,
• alkalis, reducing agents, film forming
substances (styrene butadiene co-
polymers), poly acrylates, mineral oils,
alkylaryl ethoxylates (APEO),
isopropanol, melamine derivatives etc.
• Highly coloured, high BOD, Oily
appearance, heavy metals,
• High SS and slightly alkaline. Very small
volume.
Printing wastewater snaps.

6. Profile of TPWL –ETP
Year of Establishment February, 2016
Type of ETP Biological
Capacity 500 𝒎𝟑
/day
Total Manpower 08

7. Flow Chart of TPWL-ETP Operation
Screening
Distribution Unit
Storage &
Equalization
Neutralization
Unit
Sludge return Clarifier
Biological
Oxidation Tank
Inlet flow Collection tank
Outlet

8. Printing wastewater generates areas
Wet Processing: Manufacturing processes that use water as a
carrier that contacts the product being manufactured. For
example-printing. Non-contact, closed-loop boiler or cooling
water are not considered wet processing.
TPWL-01 screen wash room: 05 & PPPL-also 01
TPWL-Expansion screen wash room: 10

9. Drainage pits or Settling tank
Raw Wastewater (Untreated Wastewater): Wastewater that
has not yet been treated prior to direct or indirect discharge,
or recycling efforts. This wastewater therefore does not meet
the quality standards for beneficial use Snaps of pits: Total pit-17

10. Collection Samp Pit
• Here raw wastewater collected
for proper flow mixing to before
flow meter.

11. Inlet wastewater flow meter
• Electromagnetic type inlet water
flow meter one is for tpwl-01 &
other is used for tpwl-02
(expansion) to track single drop
of influent water properly.
• Flow meter brand –EMS origin
from Taiwan. Pipe dia 4”
• Flow meter ensures a single
drop of water countable.

12. Screening Unit
• The first unit in wastewater treatment plants operations.
Screening is required to remove lint, fiber and other
extraneous solids that could block pumps, equipment and
damage internal machinery. It will improve plant throughput
by reducing BOD and total suspended solids(25-50%), reduce
particle sizes for treatment and reduce contamination to
water courses. Typically, any suspended solid greater than 2-6
mm in size must be removed by screening.
• Removes small rags, lint, fiber, plastic materials. Examples are
static wedge wire, tangential and rotary drum screens.
• Basic types includes horizontal reciprocating screens,
tangential flow screens or drum screens. These are made of
stainless steel.
• Screenings will be disposed with solid waste.
Control measures:
 Regular cleaning
 Prompt removal & proper disposal of screenings.
 Maintenance of good lubrication of mechanisms.
 Good house keepings, especially the screens clean & with
corrosion resistant coatings.

13. Storage/ Equalization tank
The main objectives of equalization tanks are:
• To minimize flow surges into the treatment plant and avoid peak
flow conditions.
• To neutralize high pH with low pH streams and balance the flows.
• To maintain operation of the biological treatment plant when the
production plants are not operating
• To minimize the impact of toxic chemicals entering the biological
treatment plant.
• It also avoids nasty smell and it is a kind of pre-oxygenation,
preparing waste water for bacteria to the next stage.
Capacity
• Maintain retention hour about 15.6 hours. (tank volume /flow
rate). Coarse (disc/tube) type diffuser used by this tank.
Testing Parameters:
• pH, TDS, DO, TSS, BOD, COD, Temperature, TN, TP.

14. Neutralization Tank
The purpose of this tank is to blend the acid that is
being fed for pH adjustment of the waste water by
completely mixing the tank contents.
 The raw effluent from storage tank will have
alkaline pH & neutralized by auto dosing 98%
H₂SO₄.
A pH of 7 indicates a neutral state, neither acid nor
alkaline; above 7 is considered alkaline and below 7
is acidic. A good range for the stream is a pH within
a range of 6 -9 & the operator must see that these
standards are met.
This tank is also used for lifting unit.

15. Distribution Tank
• Herein neutralized effluent mix-
up with return activated sludge
(RAS) for the objective of
uniform pollution load by
aeration & is supplied to the bio-
logical oxidation Tank.

16. Biological Oxidation/Aeration Tank
Purpose of Aeration
• The purpose of aeration is two fold:
1) to dissolve oxygen into the wastewater in the
aeration tank and
2) to intermix the mixed liquor suspended solids in
the aeration tank with the incoming wastewater.
Key monitoring point’s
• pH value in different location.
• SV, MLSS & MLVSS there ratio as well.
• Sludge age & Hydraulic retention time.
• Odor & floc size.
• DO level at different location.
• Microscopic investigation.
• BOD:N:P ratio 100:5:1
• F/M ratio
• Total-N, Total-P, NH3.
• Function of this tank is given below:
Raw influent + Activated Sludge + Oxygen + Nutrient → Micro-organism + SO2 + CO2 + NOx

17. Biological Oxidation/Aeration Tank
• The activated sludge is a bacterial mass formed by several types of
microorganisms which grows attached to organic and inorganic particles.
• To survive bacteria we have to maintain an environment like temperature (29 to
32°C), pH (7.5 to 8.0), DO (1.5-2.5ppm) & adequate retention hour.
• Flocculation of the bacterial cells (flock-forming bacteria) which leads to the
formation small aggregates which include also inorganic particles.
• Flocculation is made possible by the production of the bacteria of a viscous extra
cellular matter which works as a binding agent (this is called micro-structure). The
micro-structure tends to be round-shaped.
• Fine type (9”disc) of diffuser used by this tank to survive bacteria by aeration.
• Urea/DAP dosing will be done for growth of bacteria; this growth of bacteria will
help to increase the biomass in aeration tank.
• The aeration tank is for a food to microorganisms (F/M) ratio of 0.15 and mixed
liquor suspended solids (MLSS) concentration of 4000 mg/l.
• We have to provide 41 hours retention time to remove organic dissolved substance
(ODS). Natural bacteria is survived by C, S, H, O, N, P where 1st four comes from
printing; N made by urea & P comes from DAP.

18. Sedimentation Feeding Tank
• After Bio-degradation, the
sediment sludge is feeding in
this tank.
• Here de-coloring agent is dosing
for removing the residue color of
the biologically treated effluent.

19. Sedimentation/ Clarifier Tank
• It has the goal to clarify the water at the outlet of the oxidation tank, allowing the
sedimentation of the activated sludge on the bottom of the tank and its successive
recycling. The mixture of water and sludge coming from the oxidation tank, is put
into the middle of the sedimentation tank by a special pipe. In the sedimentation
tank, due to the low accessional speed, the biological sludge flocs separate from
the water and settle on the bottom, while the clarified water, free of substances in
suspension, goes out from the top of the sedimentation tank by overflow.
• Activated sludge is separated by laminar plate & taken in the centered bottom hole
by scraping blades. Laminar plate used by lamella clarifier (LC) at 60◦ angles.
• Treated water is going to post aeration tank crossing V-notch weir & then be
discharged. Solid portion goes to distribution tank submersible pump with
gravitational force.
• Key Monitoring points:
1. Sludge blanket depth level 2-3 ft for thickening, 3ft for buffer zone & 8ft for
clarification typically. Monitor the thickness of the sludge blanket to avoid wash-out
of solids from the clarifier
2. The return-sludge: flow rate should be adjusted to maintain the sludge blanket
as low as possible.
3. Floating solids on clarifier surface are an indication of a problem called “rising
sludge.” which occurs when the DO concentration in the secondary clarifier drops
resulting in an anoxic, or oxygen deficient, condition.
4. V-notch weir: A weir is a level control structure (often v-notched) in a final
clarifier used to provide a uniform effluent flow. Clarifier weirs should be inspected
daily for:
A. Level weirs- even flow uniformly across the weirs
B. Algae or debris plugging v-notches
C. Condition of the weirs

20. Post Aeration Tank
• The clarified effluents collected by
this tank to increase the DO &
finally discharge as treated effluent.
• Testing Parameters: pH, TDS,
TSS, DO, BOD, COD, T-N, T-P,
Temperature & Color.
• We also test other parameters as per
requirements of Buyer concern
according to different standards

21. Outlet Flow meter & discharge tank
From post aeration tank effluent is tracked
regularly & keep recorded by a electromagnetic
flow meter of EMS brand .
After tracking treated effluent discharge to municipal
drainage line. It is used as effluent sample collection
point for DoE or different buyers.

22. Sludge Management
Definition & Classification:
• Sludge: Sludge is the solid residue
generated by settlement of insoluble
organic and inorganic material in an
ETP. This sludge contains heavy metals,
inorganic salts, surfactants, chlorinated
organics, dyes and other potential toxic
pollutants and is thus classified as
hazardous waste applied for-
1.Physio-chemical effluent treatment.
2.Biological effluent treatment.
3.Chemical-biological effluent treatment.
Purpose:
• To avoid endangering human health or
harming the environment.
• To ensure that all regulatory and legislative
controls are met, and due regard is taken of
non -statutory Codes of Practice and
industry guidance.
• To establish long term, secure and
sustainable disposal routes and outlets;
• To ensure cost effective and efficient
treatment and reuse/disposal techniques;
• To ensure completely security of
environment & living beings depend on
environment from the badly effect of
hazardous sludge.

23. Sludge Recycle Tank
• The sludge re-circulation is a very important
to plant operation. It works 24 hours a day
and is needed to extract sludge settled on the
decanter floor to put it in again in the
aeration tank.
• Usually this operation is made by means of
submersible pumps at low speed (to avoid
breaking the sludge floc) with a specific
dosing of impeller that avoids the
obstruction.
• It is important to monitor the solids levels in
these recycled streams to avoid the buildup
of excessive levels of inert solids in the
secondary treatment system.

24. Sludge Thickener tank
• The excess sludge is thickened here.
To reduce the quantity of water
contained in sludge in order to permit
the settlement, a static tank with
vertical flow called thickener is used,
it permits to increase the dry substance
from 1% till max. 3%. The water
decanted returns inside the biological
plant. The thickened sludge extracted
by means of a screw press in order to
improve the dry content till 25%.
• Objectives:
Reducing volume
Gain 5-10% solid content.

25. Screw Press Sludge dehydrator
• Herein dewatering of the wet sludge is
carried out & excess water is carried to the
collection sump tank.
Objectives:
•Reducing sludge volume
•Reducing operational cost.
•Gain 35% solid content
Methods:
• Methods: Screw press.
Capacity: 10kgs/hour.
•Achieve 20-30% solid content.

26. Sludge drying bed
• The wet sludge is dried in Sludge
drying bed by sun light.
• Objectives:
Reduction of volume
Easy to transport and operate
Healthy product
Achieving dry content up to 60-
90% is possible

27. Sludge store room
• Sludge Storing criteria:
1. Here the dry sludge is stored for 3-6
months.
2. Storage location best practices-
 In shade/under cover.
 Without contact to water or
agricultural land.
 Protected from rain and flooding.
 Without access for non-authorized
people and animals.
3. Proper labeling of the storage
container.

28. Sludge Dumping area
• After six months storing the dry
sludge is dumped here with
proper documentation.