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Which polyacrylamide is better for sludge treatment?

Which polyacrylamide is better for sludge treatment? Our company should be your better choice. Let me analyze. The sludge water of the water plant is mainly composed of sedimentation tank sludge water and filter backwash water. The sludge water is concentrated by gravity settlement. The concentrated sludge contains solids. The rate is generally ≥ 4%. Because of its high water content, it has brought a lot of inconvenience to the storage, transportation and further treatment of sludge. Therefore, sludge dewatering has become an important part of sludge treatment and disposal in water plants. Before the sludge is dehydrated, the sludge needs to be conditioned to reduce the organic components in the sludge, reduce the affinity of the sludge and water, and change the form of water in the sludge, thereby improving the dewatering performance of the sludge and increasing the dehydration efficiency. . Therefore, before the sludge enters the dehydrator, a high-efficiency non-toxic economic flocculant must be added to improve the dewatering properties of the sludge, so that the suspended solids of the sludge can form coarse particles, and the particles after flocculation are not easy to break, and the solid-liquid separation effect is better. Among them, the most widely used is organic polymer flocculant polyacrylamide. According to the charge of polyacrylamide, it can be divided into three categories: cationic, anionic and nonionic. The commonly used polyacrylamides for sludge dewatering are cationic polyacrylamide and anionic polyacrylamide.


Is it more suitable to use cationic polyacrylamide or anionic polyacrylamide in the sludge treatment of water plants? Through experiments, the cationic polyacrylamide and the anionic polyacrylamide were compared in three aspects: settling effect, settling velocity and mud cake water content, and the following conclusions were drawn:

Settlement effect:

Anion and cation polyacrylamide can change the structure of sludge floc due to its function of adsorption and bridging, and can improve the dewatering and sedimentation performance of sludge. The dehydration and sedimentation performance is closely related to anion and cation and relative molecular weight. At a certain dosage, the impact resistance of cationic PAM formed flocs is better than that of anionic PAM, and the impact resistance of anionic PAM formed flocs increases with the increase of PAM molecular weight; this is mainly in water treatment The sludge particles generated in the process are small and negatively charged, and the particles repel each other, which makes the activated sludge aggregates difficult to be compressed and naturally settled. The addition of anionic PAM is also negatively charged, which may cause the particles to repel each other.

Different polyacrylamide sedimentation effects:

Settling speed:

From the perspective of settling speed, the settling rate of PAM with anion of 10 million is significantly lower than that of 15 million PAM with anion and 7 million PAM with cation. In the first three minutes, the anion with 15 million PAM and cation with 7 million PAM The sedimentation speeds of the two are similar, and as the sedimentation time increases, the sedimentation speed of 7 million PAM cations is gradually faster than that of 15 million PAM anions.

Determination of the sedimentation speed of different polyacrylamide:

Mud cake tax:

After measuring the quality of flocs formed by different PAMs, the moisture content of the three PAM mud cakes was not much different. This is because PAM has the function of “adsorption bridging”, which can quickly form sludge particles into flocs, and it also has a dehydration effect, which can transform hydrophilic colloids into hydrophobic colloids, making it insoluble in water. And finally dehydrated. When the appropriate amount of polyacrylamide is added, the sludge can be completely flocculated and dehydrated, so the moisture content of the mud cake is not much different.

In summary, which polyacrylamide is better for sludge treatment? In sludge water treatment, sludge conditioning is more suitable for cationic polyacrylamide. Our company specializes in the production and distribution of such products. If anionic polyacrylamide is used, high molecular weight anionic polyacrylamide is required. I hope my suggestion can help you helpful.

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