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NEUTRALIZATION CALCULATION pH neutralization calculation

Calculation of required chemical injection amount when adding acid to alkaline wastewater to neutralize to pH7

Relationship table of hydrochloric acid concentration and specific gravity

concentration (%) 2 6 10 16 20 26 30 36 40
specific gravity 1.01 1.03 1.05 1.08 1.10 1.13 1.15 1.18 1.20

Relationship table between sulfuric acid concentration and specific gravity

concentration (%) 1 5 10 15 20 25 30 35 40 45 50
specific gravity 1.01 1.03 1.07 1.10 1.14 1.18 1.22 1.26 1.30 1.35 1.40
concentration (%) 55 60 65 70 75 80 85 90 95 98
specific gravity 1.45 1.50 1.55 1.61 1.67 1.73 1.78 1.81 1.83 1.84 　　

Input

Raw water flow（m3/h）
Raw water pH
Margin ※1
Chemical name
Chemical concentration（%）
specific gravity

Result

Medication amount（L/h）
Medication amount（mL/min）

The result of this calculation is just a reference value and does not guarantee the pros and cons of neutralization. It is best to investigate and determine the actual dosage by neutralization titration with sample water.

*1 Margin
In the actual neutralization reaction, it is rarely neutralized according to theory because of the formation of salts between the neutralizing chemicals and the components contained in the water. Therefore, the calculation result multiplied by the margin is used as a guideline for the dosage. (Margin: about 3 to 10 times)

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