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Drinking water grade polyaluminum chloride core standards, application advantages and selection guide
2025-02-21
# foreword
As drinking water safety standards improve, polyaluminum chloride for drinking water (referred to as PAC) has become the preferred choice for water treatment in both municipal and industrial settings due to its high efficiency and low toxicity. It ensures water quality meets national standards such as GB5749-2022. This article will delve into its core indicators, application scenarios, and purchasing points to provide professional guidance for the industry.
1. Definition and core standards of drinking water grade polyaluminum chloride
1. The difference from industrial grade
Drinking water level PAC needs to strictly control the content of heavy metals (arsenic, lead, cadmium, etc.), for example, arsenic content is less than 0.00001ppm, far lower than the industrial standard. At the same time, its production process needs to remove residual impurities to ensure no risk of secondary pollution.
2. National standard requirements
Purity: Alumina (Al₂O₃) content is greater than or equal to 29% (solid).
Salt base degree: drinking water level is usually controlled at about 45%, which meets the requirements of low turbidity water treatment.
Limit of harmful substances: lead should be less than 0.00001%, and heavy metals such as mercury and chromium should be below trace level.
2. Core application advantages of drinking water level PAC
1. Efficient flocculation and sedimentation
By releasing high charge cations to rapidly adsorb suspended matter and form large flocs, it is especially suitable for purification of high turbidity water sources, and the sedimentation speed is more than 30% faster than that of traditional agents.
2. Remove color and odor
It has strong adsorption capacity for organic pollutants and dissolved substances, which can significantly improve the taste and transparency of water quality.
3. Broad adaptability
The pH value is widely applicable (3.5-5.0) and can be used in different water source conditions, such as acidic or neutral water bodies.
4. Safety and environmental protection
The aluminum residue is strictly in line with drinking water standards to avoid long-term health risks.
Three, five key indicators for choosing drinking water level PAC.
1. Alumina content
High content (≥29%) is suitable for high turbidity water, but low turbidity water needs to adjust the content to avoid excessive flocculation.
2. Salt base degree
45%-50% is the ideal range for drinking water. Too high can easily lead to turbidity of water quality, which needs to be dynamically selected according to the turbidity of raw water.
3. Heavy metal test report
Third-party testing certificates should be provided, focusing on arsenic, lead, cadmium and other indicators.
4. Water-insoluble content
≤0.1% (liquid) or ≤0.4% (solid), which affects the dissolution efficiency of the agent and the risk of equipment blockage.
5. pH Adaptability
Raw water pH needs to be adjusted to 3.5-5.0 to achieve the best flocculation effect.
Iv. Industry application scenarios and cases
Waterworks: treat surface water or groundwater to reduce turbidity to ≤ 1NTU.
Rural drinking water project: to solve the problem of water source pollution, low cost and simple operation.
Emergency water purification: rapid purification of water sources after natural disasters to ensure drinking water safety.
5. Future trend: security and intelligent upgrading
1. Green production process
Spray drying method replaces the traditional process, reduces impurity residue and improves purity.
2. Intelligent dosing system
The dosage is dynamically adjusted by the water quality sensor to reduce the waste of chemicals.
How to choose compliant products?
It is recommended to choose manufacturers that have passed GB/15892-2020 and GB/T22627-2014 certification, and ask for complete test reports. Pay attention to after-sales service, such as free water sample testing and on-site debugging support, to optimize the use effect.