How to Correctly Select the Inorganic Flocculants?

February 22, 2024

About the selection of inorganic Flocculants, most of them should be selected according to the water quality of the symptoms, in fact, it is very simple, as long as we remember a few points can be.
1. Industrial sewage, wastewater, municipal wastewater are generally selected industrial grade Polyaluminum Chloride, the content is divided into 26-28%, usually wastewater treatment are used 26% content, municipal wastewater is recommended to use 28% content, the amount of sludge produced will be relatively small.
2. Choose 28%-30% Polyaluminum Chloride for water reuse.
3. Drinking water, tap water, industrial water, raw water of power plant, industrial circulating water, etc. are chosen to use 30% content, 30% content of Polyaluminum Chloride is the implementation of the national drinking water level standard.

The reason why it is used in industrial water, raw water of power plant and industrial circulating water is that it produces less sludge and has higher processing efficiency.

Polymeric Aluminium Chloride

4. For domestic sewage or sewage with high phosphorus content but good biochemical properties, choose aluminum sulfate, the advantage of Aluminum Sulfate is that the cost is lower compared with other flocculant products, and the phosphorus removal rate is higher. Disadvantage The disadvantage is that the flocculation and precipitation effect is almost the same as the effect of polymerized aluminum gasification, so the premise of choosing aluminum sulfate is that the requirement of biochemistry is high, otherwise the flocs will be very difficult to settle.

5. Machining or cutting fluid wastewater in some cases will contain a small amount of oil floating on the surface of the waste oil, diesel oil, etc., this wastewater selection of Aluminum Sulfate, Aluminium Sulfate can remove the water surface oil and grease, to play the role of emulsion breaking. to emulsion breaking effect. Aluminum Sulfate can also be used as ink wastewater flocculation oil decolorization. (Note: only as the removal of surface floating oil and grease, suspended in the water or mixed with the water or emulsion of oil and grease with aluminum sulfate can not be removed)

6. Raw water of power plant, papermaking sewage, industrial sewage, etc. can choose polymeric ferric sulfate.

Aluminium Sulfate

7. Fenton reagent, printing and dyeing, leather, electroplating and other sewage containing heavy metals, chromaticity, COD higher choice of ferrous sulfate. The advantage of ferrous sulfate is low cost, the disadvantage is that the sludge produced The disadvantage is that it produces sludge.

8. Alkaline aluminum chloride is usually used as flocculation and precipitation in industrial sewage such as ink, leather, printing and dyeing, etc. The treatment cost is low, the disadvantage is that the salinity is high, and the dosage will become large in low temperature environment, which is suitable for indoor water treatment process in the southern region or more constant temperature.
9. Swimming pools, well water, reservoir water and other water treatment options for spray-dried polymerized aluminum chloride, spray dry polymerized aluminum chloride salinity is lower, usually for lower turbidity water.
10. Pure white polymeric aluminum chloride can be used as paper sizing agent, cosmetic additives, food preservatives, etc., relatively few applications in the water treatment industry, generally used in water treatment as reverse osmosis or pure water, mineral water and other water treatment.

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