Articles
Difference Between Basic Aluminium Chloride and Poly Aluminium Chloride
by Ming Chuanpac managerIn the realm of water treatment, the distinction between various
coagulants is crucial for achieving optimal results. Two prominent players in
this field are Polyaluminium
Chloride (PAC) and basic aluminium chloride (BAC). Despite serving
similar purposes, these coagulants exhibit distinct characteristics in terms of
appearance, raw materials, applications, and efficiency. This article aims to
unravel the differences between Polyaluminium
Chloride and basic aluminium chloride, shedding light on their unique
properties and applications.
Physical Characteristics
Basic Aluminium Chloride
(BAC): BAC is recognized by its distinctive black powder form, often
abbreviated as BAC. The deep color is a result of its specific composition and
processing.
Polyaluminium Chloride (PAC):
In contrast, PAC presents itself in a yellow or yellowish-brown powder or
particle form. This color variation is a key distinguishing feature between the
two coagulants.
Raw Materials and Production
Basic Aluminium Chloride
(BAC): BAC is processed from aluminum ash, contributing to its unique
characteristics. The raw material, aluminum ash, undergoes specific treatments
to yield the black powder form.
Polyaluminium Chloride (PAC):
PAC, on the other hand, is produced through the combination of calcium powder
and hydrochloric acid. This different raw material composition not only
influences the appearance but also affects the pricing of the coagulant.
Application Fields
Basic Aluminium Chloride
(BAC): BAC finds its primary application in industrial sewage treatment.
Its effectiveness in this domain makes it a preferred choice for addressing
wastewater challenges in industrial settings.
Polyaluminium Chloride (PAC):
PAC, having evolved from basic aluminium chloride, boasts a more extensive
scope of application. It is utilized in industrial sewage, domestic sewage, and
even drinking water treatment. The versatility of PAC makes it a valuable asset
in diverse water treatment scenarios.
pH Levels
In general, poly aluminium
chloride is slightly more acidic, while alkali aluminium chloride tends to
be more alkaline. The pH levels further vary based on the grade of the
coagulant used.
The pH of industrial-grade PAC is around 5, while basic aluminium chloride exhibits a pH
range of approximately 5.5-6. For drinking water-grade PAC, the pH is
approximately 4.
Efficiency and Environmental Impact
Polyaluminium chloride
exhibits a wider pH range for effective use compared to traditional aluminium
salts. It proves efficient in both low and room temperature water, ensuring
superior turbidity removal even in challenging conditions.
PAC also enhances solid-liquid separation efficiency, sedimentation
filtration, and sludge dewatering performance. This not only contributes to
improved water quality but also reduces the residence time of sedimentation
tanks.
Basic aluminium chloride,
while highly active and adaptable, may require the addition of alkaline
additives for optimal performance. However, this may raise environmental
concerns, making PAC a more environmentally friendly choice.
Dosage and Decolorization Ability
PAC requires a lower
dosage compared to basic aluminium chloride under similar treatment conditions.
The efficient flocculation of PAC translates to lower residual turbidity and
effective water treatment at a reduced dose.
Basic aluminium chloride,
with its high activity and rapid floc formation, stands out in the treatment of
papermaking and printing wastewater. It demonstrates superior decolorization
abilities compared to other inorganic water purifiers.
Conclusion
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About Ming Chuanpac 
manager
2 connections, 0 recommendations, 10 honor points.Joined APSense since, February 20th, 2024, From Zibo City, China.
Created on Mar 1st 2024 05:57. Viewed 66 times.
