How to solve the problem of unstable floc morphology of polyaluminium chloride?

As a highly efficient water treatment coagulant, polyaluminium chloride (PAC) can effectively remove suspended solids, colloidal substances and some dissolved organic matter in water by hydrolysis to form multi-nuclear hydroxyl complexes. However, in practical applications, the virtual body is sometimes unstable. This article will explore the causes of this problem and propose corresponding solutions. Let's learn more about it with the polyaluminium chloride manufacturer.

Reasons for the unstable morphology of polyaluminum chloride flocs:

PAC quality and dosing method:

The unstable quality or improper addition method of PAC, such as excessive or insufficient dosage, unreasonable addition point position, etc., may affect the release and distribution of aluminum ions during the coagulation process, thereby affecting the formation and stability of flocs.

Complex water quality conditions:

The complex and variable water quality conditions such as organic matter, inorganic salts, pH value, and temperature in water have a significant impact on the coagulation effect and floc stability of PAC. For example, high organic content will consume the coagulation active ingredients in polyaluminum chloride, reducing its coagulation efficiency; Inappropriate pH values can interfere with the hydrolysis and coagulation reactions of PAC, leading to loose floc structures.

Improper control of mixing and flocculation conditions:

Improper control of the mixing intensity, time, and method during the mixing stage, as well as the water flow state and residence time during the flocculation stage, may lead to unstable floc structure and easy breakage.

External interference:

External factors such as water flow shear force, bubble disturbance, temperature changes, etc. may also have adverse effects on the stability of flocs, leading to floc breakage or dispersion.

Solution to address the unstable morphology of polyaluminum chloride flocs:

Optimize PAC selection and dosing strategy:

Select PAC products with stable quality and strong adaptability based on water quality characteristics and treatment requirements. Through experimental methods such as small-scale and pilot tests, determine the optimal dosage, point position, and method of addition to ensure that polyaluminum chloridecan be fully hydrolyzed and effectively react with particles in water, forming stable and easily settling flocs.

Adjust water quality conditions:

By adding acid-base regulators, oxidants, inorganic salts, etc., the water quality conditions are adjusted to a suitable range to improve the coagulation performance and floc stability of PAC. For water sources with high organic content, pre-treatment measures can be taken to reduce the organic content and alleviate the interference on PAC coagulation effect.

Fine control of mixing and flocculation processes:

Adopting advanced mixing equipment and processes to ensure thorough mixing of polyaluminum chloride with particles in water. At the same time, by precisely controlling the water flow velocity, flow state, residence time, and stirring intensity during the flocculation stage, the formation of flocs is promoted and stability is enhanced. When necessary, multi-stage mixing and flocculation processes can be used to improve coagulation efficiency and floc stability.

Coping with seasonal changes:

In low temperature environments such as winter, the coagulation effect of polyaluminum chloride may be affected. At this point, heating or insulation measures can be taken to increase the water temperature to promote the hydrolysis and coagulation reactions of PAC and improve the stability of flocs.

Strengthen equipment maintenance and management:

Regularly maintain and inspect water treatment equipment to ensure its normal operation. At the same time, strengthen the management of PAC storage and use processes to prevent PAC from getting damp, deteriorating, or being contaminated by other factors.

PAC, as an efficient water treatment coagulant, please do not panic if you encounter unstable floc morphology. By optimizing PAC selection and dosing strategies, adjusting water quality conditions, finely controlling mixing and flocculation processes, responding to seasonal changes, and strengthening equipment maintenance and management, this technical challenge can be effectively solved. In the future, with the continuous advancement and innovation of water treatment technology, the application effect of PAC will be further improved.