What is the difference between 28% and 30% polyaluminum chloride
Release time: 2025-07-30
The difference between 28% and 30% of polyaluminum chloride (PAC) is mainly reflected in the following aspects:
I. Core difference comparison
Active ingredients and purity
30% content: aluminum oxide (Al₂O₃) content is more than 30%, less impurities, low heavy metal content (in line with GB15892-2020 drinking water standard).
28% content: Al₂O₃ content is about 28%, heavy metals and insoluble matter content is high, suitable for industrial scenarios.
Appearance and solubility
30%: usually golden yellow powder (spray drying process), fast dissolution speed, violent reaction.
28%: mostly dark yellow or reddish brown (roll/plate process), slightly weak solubility.
Usage and application scenarios
30%: The only one can be used for drinking water treatment (national compulsory standard), with remarkable effect on fluoride and heavy metal removal, suitable for high requirements of water quality (such as waterworks, swimming pools).
28%: mainly used in industrial wastewater (printing and dyeing, paper making, metallurgy, etc.), for scenes with low requirements on heavy metals.
Treatment effect and dosage
30%: fast flocculation speed, large and dense alum flowers, more than 20% improvement in sedimentation efficiency; under the same water quality, the dosage is reduced by about 10-30% compared with 28%.
28%: Higher dosage is required to achieve similar effect, especially weak adaptability to high turbidity wastewater.
Price and economy
30%: the average price is about 2300 yuan/ton (including tax), the cost is high but the comprehensive cost performance is excellent (less consumption, high efficiency).
28%: the average price is 2100 yuan/ton, suitable for industrial projects with limited budget.
Second, selection suggestions
Prioritize 30%:
Drinking water purification, food processing wastewater, sensitive water bodies (such as radioactive substances) and strictly regulated scenarios.
Option 28%:
Ordinary industrial wastewater (e.g., coal washing, leather), low budget projects, need to be combined with heavy metal testing.
III. Notes
Process effect: The 30% purity of spray drying is better than that of plate and frame type. The process should be specified when choosing.
Pseudo-identification: through PH value (1% aqueous solution PH=3.5-5.0) and ultraviolet spectrum detection, avoid low-quality products.
The difference between the two is significant. 30% is better than 28% in terms of purity, safety and efficiency, but the cost is about 20% higher. 30% must be selected for drinking water, and industrial scenarios can be selected on demand.
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