This document describes the effluent treatment plant (ETP) of Delta Knit Composite Ltd. The ETP uses a biological treatment process to treat 120 m3/hr of industrial wastewater. The treatment process includes screening, equalization, pH correction, aeration, sedimentation, sludge thickening, and recycling of sludge. The ETP is able to reduce pollutants in the wastewater and produce treated effluent that can be safely discharged and dried sludge.

1. DEPARTMENT OF TEXTILE ENGINERING
ETP : Effluent Treatment Plant For Textile

2. COURSE TITLE
“ENVIRONMENTAL POLLUTION AND ITS CONTROL”
PRESENTATION ON
“ETP OF DELTA KNIT COMPOSITE LTD.”

3. PREPARED BY
Name
ID
Mazadul Hasan Sheshir
2010000400008

4. PRESENTER
Mazadul Hasan Sheshir
2010000400008

5. WHAT IS ETP?
ETP OR EFFLUENT TREATMENT PLANT IS USED TO TREAT THE
INDUSTRIAL WASTE WATER.
INFLUENT: UNTREATED INDUSTRIAL WASTE WATER.
EFFLUENT: TREATED INDUSTRIAL WASTE WATER.
SLUDGE: SOLID PART SEPARATED FROM WASTE WATER BY ETP.
TREATMENT
INFLUENT
ETP
SLUDGE
EFFLUENT

6. ABOUT THE ETP OF DELTA KNIT COMPOSITE LTD.
 BIOLOGICAL ETP: TREATMENT OF
WASTE WATER BY BACTERIA.
TREATMENT CAPACITY: 120 m3/hr
STORAGE CAPACITY: 6000 m3

8. FLOW CHART OF ETP OF DELTA KNIT COMPOSIT LTD.
INFLUENT
SCREENING
EQUALIZATION
PH CORRECTION
DISPERSE UNIT
AERATION
RECYCLE
TANK
SEDIMENTATION PACK
SEDIMENTATION TANK
EFFLUENT
FISH POND
SLUDGE THICKENING UNIT
SLUDGE
SLUDGE DISCHARGE
EFFLUENT DISCHARGE

9. SCREENING
(DRUM SCREENER IS USED IN THIS ETP)
 SCREENING IS THE
FILTRATION PROCESS FOR THE
SEPARATION OF COARSE
PARTICLES FROM INFLUENT.
 STAINLESS STEEL NET IS USED
FOR SCREENING.
 HARD PLASTIC BRUSHES ARE
USED TO CLEAN THE NET, WHICH
ARE DRIVEN MECHANICALLY.
DRUM SCREENER

10. SCHEMTIC DIAGRAM OF DRUM SCREENER

11. EQUALIZATION
EQUALIZATION IS THE PROCESS TO
MAKE THE WASTE WATER-HOMOGENOUS &
-COOL
EQUALIZATION TANK IS ALSO
CALLED HOMOGENOUS TANK.
RETENTION TIME 8 HOURSE
THIS TANKA IS MADE OF RCC.

12. SCHEMTIC DIAGRAM OF EQUALIZATION TANK
SPRAY OF WATER
COMING FROM DYEING
UNIT
INFLUENT FROM
SCREENING
EQUALIZATION TANK
AIR FOR DIFFUSION
COOL
&
HOMOGENOUS
INFLUENT TO
PH CORRECTION
TANK

13. PH CORRECTION
 IN THIS TANK PH OF THE INFLUENT IS
CORRECTED TO MEET THE STANDARD.
 ACID OR ALKALI IS ADDED TO THE
EFFLUENT BY DOZZING TO INCREASE OR
DECREASE THE PH OF INFLUENT
RESPECTIVELY.
 MULTI-METER TYPE PH METER IS USED.

14. SCHEMTIC DIAGRAM OF PH CORRECTION
ACID OR ALKALI
INFLUENT OF
DESIRED PH TO
DISPERSE UNIT
INFLUENT FROM
EQUALIZATION TANK
PH CORRECTION

15. DISPERSE UNIT
 FUNCTION OF DISPERSE
TANK IS TO MIX THE SLUDGE
COMING FROM RECYCLE
TANK WITH WASTE WATER.
 IT HELPS TO PROPER
AERATION.

16. SCHEMTIC DIAGRAM OF DISPERSE UNIT
SLUDGE FROM
RECYCLE TANK
INFLUENT FROM
PH CORRECTION
TANK
DISPERSE UNIT
( MIXING OF SLUDGE & WASTE)
MIXED INFLUENT &
SLUDGE TO
AERATION

17. AERATION
 FUNCTION OF AERATION IS
OXIDATION BY BLOWING AIR.
 AEROBIC BACTERIA IS USED
TO STABILIZE AND REMOVE
ORGANIC MATERIAL PRESENTS
IN WASTE.
 ABOUT 200 KG AEROBIC
BACTERIA IS GIVEN TO THE
PLAN FOR 5 YEARS.

18. SCHEMTIC DIAGRAM OF AERATION
AEROBIC BACTERIA
MIXTURE OF
WASTE
WATER &
SLUDGE
AERATION TANK
DISCHARGE TO
SEDIMENTATION
TANK
O2
AIR
REACTION IN AERATION TANK:
BACTERIA
ORGANIC MATTER + O2
CO2+ HO2 + HEAT
NUTRIENT

19. SEDIMENTATION PACK
IN THIS TANK SLUDGE IS
SETTLED DOWN PARTIALLY
SEDIMENTATION PACK
PROVIDES THE ADVANTAGE
OF FAST SLUDGE
SEPARATION

20. SEDIMENTATION TANK
 IN THIS TANK SLUDGE IS
SETTLED DOWN FINALLY.
 EFFLUENT IS DISCHARGED
FROM PLANT THROUGH A FISH
POND.
 SLUDGE IS PASSED TO THE
THICKENING UNIT.

21. SCHEMTIC DIAGRAM OF SEDIMENTATION TANK
WASTE WATER
FROM
SEDIMENTATION
PACK
SEDIMENTATION
TANK
SLUDGE TO
THICKENING UNIT
EFFLUENT
FISH POND
EFFLUENT
DISCHARGE
FISH POND INDICATES THE HIGHER DEGREE OF TREATMENT IN THIS ETP

22. EFFLUENT DISCHARGE

23. SLUDGE THICKENING UNIT
IN THIS UNIT SLUDGE IS DRIED
AND DISCHARGED.
A PARTIAL AMOUNT OF SLUDGE
IS RETURNED BACK TO THE
AERATION TANK FROM THICKENING
UNIT THROUGH RECYCLE TANK
CALLED RETURN SLUDGE TANK
AND DISPERSE TANK.

24. SCHEMTIC DIAGRAM OF SLUDGE THICKENING
UNIT
SLUDGE FROM
SEDIMENTATION
UNIT
SLUDGE DISCHARGE
SLUDGFE
THICKENING UNIT
SLUDGE TO
RECYCLE TANK

25. DRIED SLUDGE

26. RETURN SLUDGE TANK
FUNCTION OF RETURN TANK OR
RECYCLE TANK IS TO MIX WATER
WITH SLUDGE
THIS MIXTURE IS THEN PASSED TO
AERATION TANK THROUGH
DISPERSE TANK.

27. ADVANTAGE OF RECYCLE SLUDGE TO AERATION TANK
 SLUDGE AGAIN OXIDIZED TO MINIMIZE THE POLLUTION FROM
SLUDGE.
 ALIVE BACTERIA OF SLUDGE IS AGAIN USED IN AERATION TO UTILIZE
THIS BACTERIA.
SLUDGE FROM
THICKENING UNIT
SLUDGE TO AERATION TANK
THROUGH DISPERSE UNIT
SLUDGE RECYCLE
TANK
MIXING OF SLUDGE
& WATER

28. THANKS TO ALL