company news about Calculation of Decolorizing Agent Dosage Amount

How to calculate the dosage amount of decolorizing agent?

1. Dosage Calculation of Reagent (PPM)

The formula for calculating the reagent dosage in parts per million (PPM) is:

Dosage (PPM) = [(Number of drops / 20) × Dilution concentration / Volume of test wastewater] × 10⁶

★ PPM represents one part per million. A dosage of 1 PPM means 1 gram of reagent is added to 1 ton of wastewater.
★ 1 mL of diluted solution is equivalent to 20 drops.

2. Experimental Procedure

Take 200 mL of test wastewater (chroma: 200, COD: 110) using a beaker.

Adjust the pH value to 8.

Add 10 drops of decolorizing agent solution using a dropper (1 mL = 20 drops) and stir.

Add 12 drops of PAC (Polyaluminum Chloride) and stir.

Add 2 drops of PAM (Polyacrylamide) and stir.

Let the solution stand for 1 minute.

Results:

Chroma: 4 (measured using the dilution multiple method)

COD: 85

The results meet the national emission standards.

3. Reagent Preparation Dosage

Decolorizing agent: 2% solution (diluted 50 times)

PAC: 2% solution

PAM: 1‰ aqueous solution

Calculations:

Decolorizing agent dosage = [(10/20) × 2% / 200] × 10⁶ = 50 PPM

PAC dosage = [(12/20) × 2% / 200] × 10⁶ = 60 PPM

PAM dosage = [(2/20) × 1‰ / 200] × 10⁶ = 0.5 PPM

Interpretation:

Decolorizing agent: 50 PPM = 50 grams of stock solution per ton of wastewater.

PAC: 60 PPM = 60 grams of stock solution per ton of wastewater.

PAM: 0.5 PPM = 0.5 grams of stock solution per ton of wastewater.