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Application of polyaluminum chloride in wastewater treatment plants

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Industry News

2021-11-22

Currently, people are accustomed to purchasing solid aluminum chloride; therefore, understanding how to dissolve it beforehand is essential knowledge for using polyaluminum chloride. Polyaluminum chloride needs to be dissolved at room temperature. When using it on-site, place the polyaluminum chloride into a dissolution tank, directly add tap water, and stir thoroughly until fully dissolved, leaving behind a polyaluminum chloride solution. In most cases, the weight ratio of polyaluminum chloride to water is 1:4, 1:5, or 1:5. When using the solution, it should be diluted according to the concentration of the polyaluminum chloride solution being employed.

We should analyze this issue in detail based on the actual situation. Today, I’d like to introduce how to use polyaluminum chloride.

Currently, people are accustomed to purchasing solid aluminum chloride; therefore, understanding the basics of dissolving polyaluminum chloride before use is essential. Polyaluminum chloride needs to be dissolved at room temperature. When using it on-site, place the polyaluminum chloride into a dissolution tank, directly add tap water, and stir thoroughly until fully dissolved, leaving behind a polyaluminum chloride solution. In most cases, the weight ratio of polyaluminum chloride to water is 1:4, 1:5, or 1:5. When using the solution, it should be diluted according to the concentration of the polyaluminum chloride solution being employed.

When using polyaluminum chloride in actual wastewater, it is necessary to conduct small-scale experiments to determine the appropriate dosage and concentration of polyaluminum chloride. Then, prepare a polyaluminum chloride solution of the corresponding concentration and pump it into the dosing tank via a dosing pump. Finally, use a mixing device to thoroughly blend the polyaluminum chloride solution with the wastewater.

Since this property cannot be preserved for long periods, the prepared polyaluminum chloride solution must be used on the same day it is prepared; therefore, it needs to be freshly prepared each day. Because tap water is used, the polyaluminum chloride solution will usually have a small amount of sediment over time, but this does not affect the effectiveness of the polyaluminum chloride.

How should polyaluminum chloride be used? In most cases, adjustments still need to be made based on site conditions. There is no fixed method. Only by using aluminum chloride appropriately can the desired effect be achieved.

The proper use of polyaluminum chloride directly affects its effectiveness. The accurate application of polyaluminum chloride typically depends on how it is used and the dosage applied. However, in practical applications, due to varying site conditions, the method of using polyaluminum chloride may also differ. What issues should be taken into account in actual applications?

In fact, commonly used polyaluminum chloride is used in melting equipment. The dissolved polyaluminum chloride is added to wastewater via reaction-addition equipment. Typically, during the reaction process, corresponding reaction tanks, subsequent sedimentation equipment, or dewatering equipment are set up. Only through the functions of these devices can the polymerization of aluminum chloride achieve better application results.

There are many types of dissolution equipment used in practice, but generally, tap water is directly used for dissolving, and corresponding stirring equipment is employed to ensure thorough dissolution of polyvinyl chloride aluminum. Preparing a solution of polyvinyl chloride aluminum and adding it into the wastewater essentially constitutes a dosing device. This dosing device pumps the aqueous solution of polyvinyl chloride aluminum into the sewage stream, and the reaction apparatus typically consists of a flow-through system. By adding the polyvinyl chloride aluminum solution into the flowing sewage, thorough mixing and reaction can be achieved even under slow-flow conditions. Subsequently, the reacted liquid passes through appropriate sedimentation or pressure filtration equipment to achieve the desired water purification effect.

When using polyaluminum chloride, one should take into account its inherent characteristics and select the appropriate aluminum chloride product based on the wastewater treatment conditions. Then, apply it according to the actual situation to achieve the desired results.

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