Effluent Treatment Plant (ETP) & Its Operation

Techno Color Corporation is producing S.O.Dyes. Most of the dyes are spray-dried with our recently commissioned Spray Dried Plant. The waste water generated from the production process is mainly the washings of the Spray Dried Plant and the reactors, which gets collected in 25 M3 capacities RCC underground Collection Tank from this tank, the waste water is pumped to 3 X 5 M3 capacities R.C.C stirred tanks, three such tanks are available in series. The waste water is checked for pH. (There are 2 X 10 M3 capacity HDPE underground tanks in reserve. In most cases, it is neutral and if not, it is corrected either with HCl or Caustic Lye depending on the pH value to get the resultant pH within 6.5 – 8.5. It is then treated with diluted Ferrous Sulphate solution and the pH is compensated to form small flocks. It is then treated with Polyelectrolyte solution to precipitate the coagulated mass. The resultant coagulated mass is then filtered in Nutsche filter. The clear liquid is allowed to flow either in underground 10 M3 HDPE tank or underground 25 M3 R.C.C tank. The contents are checked for COD. The treated waste water is aerated further by diffuse aeration system, if required.

The treated waste water, Okay in all respect, is pumped to G.I.D.C. Drainage system through clarifier containing Activated Carbon Bed.

Details of Effluent Treatment Plant:

1) Collection Tank

No of Unit 1
Length 7550 mm
Breadth 1200 mm
Depth 1750 mm
Total Volume 25,000 Ltrs
Flow From Process Plant
Flow To Equalization-cum-Treatment Tank by Pump
Material of Construction R.C.C

2 (A). Newly Installed Equalization-Cum-Treatment/Neutralization Tank

No. of Unit 3 × 5000 Ltrs Capacity of each Tank
Diameter 1750 mm
Length 2500 mm
Flow From Underground Effluent Collection Tank by Pump
Flow To Filter N-utsch by Gravity
Material of Construction R.C.C

2 (B). Equalization-Cum-Treatment/Neutralization Tank

No of Unit 2
Length 2000 mm
Height 3450 mm
Total Volume 1000 Ltrs of Each Tank
Flow From Process plant or Underground effluent collection tank by pump
Flow to Filter Nutsche by Gravity

3) Filter Nutsche

No of Unit 1 (+1 as standby)
Diameter 2200 mm
Height 660 mm
Total Surface Area 380 cm²
Total Volume 2500 Ltrs
Flow From Equalization tank by Pump
Flow To Area Tank by Gravity
Material of Construction Mild Steel Rubber Lined

4) Sludge Storage Tank

No of Unit 1
Length 1270 mm
Breadth 1270 mm
Depth 700 mm
Total Volume 1,000 Ltrs
Material of Construction Mild Steel

5) Aeration Tank

No of Unit 1
Length 7550 mm
Breadth 1200 mm
Depth 1750 mm
Total Volume 25,000 Ltrs

6) Settling Tank

No of Unit 1
Total Volume 2,000 Ltrs

7) Activated Carbon Column

No of Unit 1
Diameter 275 mm
Length 1800 mm
Packing Packed with Activated Carbon
Total Volume 25,000 Ltrs