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Silicone defoamer-FushunHow to use polyferric sulfate and matters needing attention:
Due to the different nature of the raw water, it should be debugged on site or tested in a beaker according to different conditions to obtain the best use conditions and the best dosage to achieve a good treatment effect:
Before use, put polyferric sulfate into the alum solution tank at a certain concentration (10-30%), pour tap water and stir to make it fully hydrolyzed, and let it stand until it is reddish-brown liquid, then dilute with water to the required concentration and add coagulation. The water plant can also be equipped with 2-5% for direct dosing, and industrial wastewater treatment can be directly equipped with 5-10% for dosing.
The dosage is determined according to the nature of the raw water through production debugging or beaker experiment depending on the appropriate amount of alum formation. The water plant can use other dosages as a reference. Under the same conditions, the dosage of this product and solid polyaluminum chloride is roughly the same. It is equivalent, 1/3-1/4 of the amount of solid aluminum sulfate. If the original liquid product is used, it can be calculated based on the concentration of the corresponding agent. Roughly based on the weight ratio of 1:3.
When in use, the above-mentioned prepared liquid is pumped into the metering tank, and the liquid is coagulated with the raw water through metering.
Under normal circumstances, it is used on the day of preparation on the same day. Tap water is required for preparation. A little sediment is normal.
Pay attention to the hydraulic conditions and the formation of alum in the three stages of the coagulation process.
Coagulation stage: It is the process in which the liquid is injected into the coagulation tank and the raw water is rapidly coagulated to form fine alum flowers in a very short time. At this time, the water body becomes more turbid. It requires that the water flow can produce intense turbulence. In the beaker experiment, it is advisable to stir quickly (250-300 rpm) for 10-30S, generally not more than 2min.
Flocculation stage: It is the process of the growth and thickening of the alum. It requires a proper degree of turbulence and sufficient residence time (10-15min). In the later stage, a large number of alums can be observed to gather and sink slowly to form a clear surface layer. In the beaker experiment, first stir at 150 rpm for about 6 minutes, and then stir at 60 rpm for about 4 minutes until it is in a suspended state.
⑶ Settlement stage: It is the floc settling process carried out in the settling tank, requiring slow water flow