Inter loop - one of the world's largest hosiery manufacturers with Hosiery being its core business - has an annual Company turnover exceeding $250 million. Besides Hosiery Interloop is a reputed manufacturer of quality yarn.It is a complete vertically integrated organization with in-house spinning, yarn dyeing, knitting and finishing facilities. Inter loop houses over 4,000 knitting machines, 46,704 ring-spinning spindles and has more than 13,000 employees. The Company offers a wide range of socks with various quality levels and price points in line with all types of customers including brands, retailers, specialty stores etc. besides quality yarns for Denim, Hosiery & weaving industry. Their manufacturing facilities are in Pakistan (Faisalabad and Lahore) and Bangladesh. With a Global focus on customer service, we have product design/development, marketing & distribution network in Pakistan, Bangladesh, North America and Europe. Wastewater treatment plant of interloop is designed on the basis of activated sludge process and this was designed by ENTA in 2012. It consists of 5 different parts 1. Screening 2. Equalization tank (which also acts as primary sedimentation tank) 3. Biological treatment 4. Secondary Sedimentation 5. Sludge Dewatering

1. WW TREATMENT PLANT
(Activated Sludge Process)

2. INTRODUCTION
 Visit to INTERLOOP

4. OBJECTIVES OF VISIT
Processes and WW Generation
WW Treatment plant
Environment, Health & Safety

5. WW TREATMENT PLANT
 ACTIVATED SLUDGE PROCESS

6. PLANT DESCRIPTION
 Plant Description
Year of
establishment
• 2012
Designated By
• ENTA (Turkey)
Plant Capacity
• 120 m^3/hr

7. STEPS IN ASP
SCREENING
EQUILIZATION TANK
BIOLOGICAL TREATMENT
SECONDARY SEDIMENTATION
SLUDGE DEWATERING

8. SCREENING
 Purpose
 remove large objects from wastewater

11. EQUILIZATION TANK
• For homogeneous mixing
• To increase the air volume
in equalization tank in
wastewater treatment
Purpose

12.  Homogeneous mixture through actions of
coarse bubble diffusers
 Necessary to force compressed air in the
sewage held in the tank

13.  Equalization tank also acts as PRIMARY SEDIMENTATION TANK

14.  Reduce the velocity of
the wastewater flow
 Allowing heavier
organic solids (called
raw sludge) to settle

15. •60% of suspended
solids
•35% of BOD removal
Efficiency

16. BIOLOGICAL TREATMENT IN
ASP
In ASP
treatment
using
Aeration
Biological floc

17. Primarily designed for removal of
• Dissolved organic matter
• Suspended organic matter
Optimized Environmental conditions
• To encourage growth of microorganisms

18. Parameters in
biological treatment
Acid dosing Nutrient dosing Chemical dosing

19.  Aeration Tank/ Reaction Tank
 Diffusers

20. MLSS (mixed liquor
suspended solids)

21. ACID DOSING

22.  HYDROCHLORIC ACID
 To maintain pH
 To save the microorganisms

23. NUTRIENT DOSING
Nutrient dosing

24.  Carbon
 To build their cell structures
 To generate energy
 Nitrogen
 organic N is converted to NH4-N by the bacteria
 Phosphorous

25. C:N:P
Ratio
Balanced relationship
between C, N and P
Range between 100:10:1
and 100:5:1

26. CHEMICAL DOSING
 Phosphorus removal
 Prevention of sludge bulking/foaming
 Biological treatment enhancement

27. SECONDARY SEDIMENTATION
 Allow the microorganisms and other solids to settle

29. Solids Settle Scraped to Sump & Removed by
Pumping

30. Drive Mechanism Also Drives Skimmer Arm to Remove Floating Scum

31. The Water Flows to the Effluent Weir
Around the Circumference of the
Clarifier

32. SLUDGE DEWATERING
Separation of a liquid and solid phase
Increase the solid content in the sludge
Thickener tank is used for sludge thickening

33. SLUDGE
BEDS
 Sludge is pumped into
sludge drying beds
 Filtrate water coming
out of sludge drying
bed is transferred to the
equalization tank

34. ACTIVATED SLUDGE SYSTEM

35. CONCLUSION
After Treatment EFFLUENT
CHARACTERISTICS
• pH 6-9
• BOD ≤ 30𝑚𝑔/𝐿
• TSS ≤ 30 𝑚𝑔/𝐿