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Wastewater Color Treatment Cases

Wastewater Color Treatment Cases

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Wastewater Color Treatment Cases

Case 2 – Printing Ink Wastewater

Technical flow process:

  • BWD-06 Water Decoloring Agent + PAC Coagulant + PH adjusted to 7.0-7.5 + PAM Flocculant

Functions for the chemicals:

Chemical Name

Functions

Dilution Rate

Order No.

BWD-06 Water Decoloring Agent

Decolorizing, generating small flocs

1:50 with clear water

1st

PAC (Polyaluminium chloride)

Coagulation improving, generating big flocs

5% Al2O3 (17gram PAC in 83gram clear water)

2nd

PAM (Polyacrylamide)

Flocculating, to speed up the sedimentation

1:1000 with clear water

Last

Acid

For PH adjustment when the effluent alkaline

5% HCL solution

3rd

Alkali

For PH adjustment

5% NaOH solution

3rd

Text Method:

  • StepsBWD-06 Water Decoloring Agent + PAC Coagulant + PH adjusted to 7.0-7.5 + PAM Flocculant
  • Prepare the solution for each chemical, and the laboratory apparatus and 1-14 pH test strips.
  • Dose 200-1000ppm BWD-06 (calculated as raw material), the exact dosage based on the different test, stir it for minutes till the small flocs generating
  • Dose 500-1000ppm PAC (calculated as solid), the exact dosage based on the different test, stir it for minutes till the big flocs generating.
  • If the dosage of BWD-06 is big, no need to use PAC.
  • Test effluent pH, if not in 7-7.5, adjust with Acid or Alkali solution, sometimes, pH around 8-9 is better performance.
  • The effluent after pH adjusted, has flocs generated, dose 1ppm PAM (calculated as solid), stir slowly, till the flocs becoming big, and then stay for minutes for sedimentation.