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Influencing factors of coagulation technology

Source: Xingwo Environmental Engineering Updated: 2017-05-19

In practical applications, there are many factors that can affect the coagulation technology, the more common ones are as follows:

Water temperature
The temperature of the water body is an important factor affecting the coagulation effect. In many places, the temperature in winter is often below zero. Affected by the climate, the water temperature in these areas is also very low. In this case, no matter how many high-quality coagulants are added, the coagulation will also work. The reason is that the temperature is not high, which results in a long time to generate alum flowers and affect the progress of floc formation. Because the hydrolysis reaction of the coagulant is endothermic, the temperature is too low to inhibit its reaction. In addition, too low temperature will increase the viscosity of the water body and reduce the intensity of the Brownian motion of the particles. High, unable to exert the ideal working efficiency of flocculant.

2. Contact with the medium
If the flocculation process is to be made faster and the effect is more complete when the coagulation process is carried out, it is necessary to keep a certain layer of sludge in the water, which is what we call the contact medium. The contact medium can be well adsorbed on the floc surface, making the effect of coagulation better.

3. Type of coagulant
Coagulants include inorganic coagulants, organic coagulants and microbial coagulants. Therefore, adding different coagulants in water will also get different coagulation effects. Generally speaking, inorganic coagulants are more widely used in water treatment at this stage, and the effect is better.

4. Optimal dosage of coagulant
In the actual operation of water treatment projects, the dosage of coagulant is not as much as possible, but there is an optimal dosage, which can give play to the best performance of the coagulant and achieve the working efficiency of the coagulation process highest. Therefore, before the water purification process is officially put into operation, the optimal amount of coagulant should be found first.

5.stirring speed
When using a coagulant, after putting the coagulant into water, it should be fully stirred with a stirring blade to ensure that the coagulant is fully dissolved in water. In addition, the speed of stirring can also affect the performance of the coagulant, because it can directly determine the uniform distribution of the coagulant in water and the chance of collision between particles. If the stirring is too slow, the distribution of the coagulant will be uneven and it will be difficult to achieve optimal coagulation. If the stirring is too fast, the formed flocs may be broken and the process of coagulation may be hindered.

6.pH
Water contains a large amount of organic matter, which is easily affected by the pH of the water body. When the pH is too low, the organic matter is more likely to flocculate; when the pH value is too high, it will be unfavorable for flocculation of this kind of substance; the pH value will also affect the particles in the water The charged state of the ion, especially the concentration of hydrogen ions; pH also affects the redox potential of the ions, and these potentials play an important role in the flocculation of the particles.