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Silicone defoamer-Xingtai Zhangjiakou preferred enterpriseUse and precautions of polyferric sulfate:
Due to the different nature of raw water, site debugging or beaker test should be conducted 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 dissolving tank at a certain concentration (10-30%), pour tap water and stir to make it fully hydrolyzed, let it stand until it turns reddish brown, and 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 product was originally 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 and dosing.
Under normal circumstances, use 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 coagulation.
Coagulation stage: the liquid is injected into the coagulation tank and quickly coagulated with the raw water to form fine alum flowers in a very short time, and the water body is more turbid at this time. 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 growth of alum flowers, which requires proper turbulence and sufficient residence time (10-15min). In the later stage, a large amount of alum flowers can be observed to 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 Settling stage: It is the floc settling in the settling tank, which requires water flow.