Polyaluminum chloride is a water-soluble inorganic polymer coagulant. Due to the bridging effect of hydroxide ions and the polymerization of polyanions, it is an inorganic polymer water treatment agent with larger molecular weight and higher charge. The dosage of polyaluminum chloride agent is 3-40 g/ton for liquid products and 1-15 g/ton for solid products, which is determined by the user according to the mixing test and production test.
The polyaluminum chloride liquid product can be added directly or diluted with water. The polyaluminum chloride solid product should be added after being dissolved in water. The amount of water added can be determined according to the dosage of the agent and the quality of the water to be treated. The dilution ratio is: 2%-20% for solid products, 5%-50% for liquid products. Percentage by weight).
According to the different conditions of raw water, you can do a small test to find the best dosage before using polyaluminum. In order to facilitate the calculation, the small test solution is configured according to the mass-volume ratio (M/V), generally 1% is better. If a 1% solution is prepared: weigh PAC1g, put it into a washed 100ml graduated cylinder, add water to dilute to 100 marks after it is dissolved, and shake it well. If it is used in production, first mix and dissolve the solid with clean water, then add water to dilute to the required concentration. The liquid can be directly diluted according to the required concentration.
During use, if the concentration is too low, the solution below 1% is easy to hydrolyze, which will reduce the use effect; if the concentration is too high, it is difficult to grasp, and it is easy to cause waste. Dosing needs to be added according to the best dosing amount obtained, and pay attention to observation and adjustment during operation. If there are few alum blooms in the sedimentation tank, the residual turbidity is large, and the water lines are not clear, the dosage is too small; if the alum blooms in the sedimentation tank are large and upturned, and the residual turbidity is high, the dosage is too large and should be adjusted appropriately .
It should be noted that water treatment chemicals of different manufacturers or different brands cannot be mixed, and must not be mixed with other chemicals; the original solution and diluent are slightly corrosive, but lower than other various inorganic coagulants; the product is effectively stored Period: half a year for liquid and one year for solid. The solid product can still be used after being damp. The use methods of polyaluminum ferric chloride, polyferric sulfate and polyaluminum are similar, and the specific use amount is determined by the quality of the water to be treated.
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