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.
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