How to use ferrous sulfate heptahydrate for water purification？

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Water Purification Applications (Wastewater Treatment)

Used to remove phosphates, color, and heavy metals from water. The dosage should be calculated based on water quality indicators.

1.Preparation:

Dissolve ferrous sulfate heptahydrate into a 5%-10% aqueous solution (higher concentrations will result in precipitation).

2. Dosage Method:

For single use: Add directly to the wastewater tank, stir evenly, and allow to react for 30 minutes. Then, add lime to adjust the pH to 7-8 to form flocculent precipitates.

For combined use with polyaluminum chloride (PAC): Add ferrous sulfate first, then PAC. This will improve precipitation efficiency and reduce sludge production.

3. Note:

The iron content in treated water must meet discharge standards (≤0.3 mg/L). Excessive iron content will cause the water to turn yellow.

Wear gloves and a mask during operation to avoid direct skin contact (the aqueous).