The Science Behind ACH: Understanding the Properties of Aluminum Chlorohydrate
To truly appreciate the effectiveness of Aluminum Chlorohydrate (ACH) as a water treatment chemical, it's essential to understand the science behind its exceptional performance. NINGBO INNO PHARMCHEM CO.,LTD. aims to demystify the properties that make ACH a preferred choice for many purification processes.
At its core, ACH is an inorganic polymer composed of complex basic aluminum chloride salts. Unlike simpler aluminum salts like alum (aluminum sulfate) or aluminum chloride, ACH exists as a highly polymerized structure. This polymerization results in the formation of polynuclear aluminum species with a higher degree of charge neutralization. The general formula often cited is AlnCl(3n-m)(OH)m, where 'n' and 'm' are variables indicating the complex polymeric nature. This structure is key to its advanced coagulation capabilities.
A crucial property is ACH's high basicity. Basicity, in this context, refers to the ratio of hydroxyl groups to aluminum atoms, indicating the extent to which the aluminum chloride has been neutralized. ACH typically exhibits basicity levels of 80-85% or even higher, significantly exceeding that of conventional PAC (around 50%) and alum (which has no basicity). This high basicity contributes directly to the enhanced positive charge density of the aluminum species. A higher positive charge is more effective at attracting and neutralizing negatively charged colloidal particles and dissolved organic matter in water.
This heightened charge density is the primary reason ACH can be used at lower dosages compared to other coagulants. Less chemical is needed to achieve the same level of contaminant removal, which translates into cost savings and reduced chemical sludge. The strong, dense flocs formed by ACH also contribute to faster settling and better dewatering characteristics of the sludge, further optimizing the treatment process.
Furthermore, the highly polymerized nature of ACH contributes to its stability and its minimal impact on the pH of the treated water. As it neutralizes impurities, it consumes fewer alkalinity reserves in the water compared to less polymerized coagulants. This property is particularly beneficial in treating waters with naturally low alkalinity or in processes where maintaining a stable pH is critical.
The combination of high aluminum concentration, superior polymerization, and elevated basicity makes Aluminum Chlorohydrate a technologically advanced coagulant. These inherent properties allow ACH to efficiently tackle a wide range of water quality challenges, from turbidity and color removal to the elimination of fine suspended solids and dissolved organic matter.
NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to providing clients with chemicals that leverage cutting-edge scientific principles for optimal results. Understanding the fundamental properties of Aluminum Chlorohydrate empowers users to harness its full potential in achieving superior water treatment outcomes.
Perspectives & Insights
Future Origin 2025
“A higher positive charge is more effective at attracting and neutralizing negatively charged colloidal particles and dissolved organic matter in water.”
Core Analyst 01
“This heightened charge density is the primary reason ACH can be used at lower dosages compared to other coagulants.”
Silicon Seeker One
“Less chemical is needed to achieve the same level of contaminant removal, which translates into cost savings and reduced chemical sludge.”