The Difference between Polyaluminum Chloride and Polyacrylamide

To find out which polyaluminum chloride and polyacrylamide are flocculants, first I have to figure out the difference between coagulant and flocculant. Coagulation refers to a process in which a chemical is injected into a water to hydrolyze a colloidal bilayer in a colloid, which causes destabilization and emulsion breaking to form flocs. Flocculation is the adsorption of the small flocs and colloidal particles. The net is trapped and precipitated. The main appearance is the phenomenon of flocculation into large chunks. The flocculant does not have agglomeration. Coagulation = coagulation + flocculation.

Polyacrylamide is a new type of inorganic salt iron-based polymer water treatment agent, which has an electron neutralization effect on solutes, colloids and suspended matter in wastewater. In particular, the form of the polymer makes it dissolve in the waste water and grows the growth line. The two ends can adsorb and bridge these substances in the water. These long lines of polyacrylamide will cross each other to form a small net to the water. The particles are subjected to a roll sweep to coagulate the precipitate. From this point of view, polyacrylamide is a typical high-molecular flocculant. The flocculant and the coagulant are both one of the coagulants. Therefore, the polyacrylamide is both a flocculant and a coagulant.
After being added to the wastewater, the polyaluminum chloride can utilize the high molecular weight three-dimensional network structure to bond small flocs formed by coagulation in the wastewater to form large flocculated sails, so that the polymer chain Intertwining and cross-linking forms a net trap, thereby increasing the structure of the floc, thereby accelerating the separation of solids and liquids, and forming a precipitate later. However, polyaluminum chloride does not have agglomeration, so it has only flocculation and can only act as a flocculant. In the wastewater treatment, polyacrylamide + polyaluminum chloride is often used in combination. The combination of the coagulation and flocculation uses the agent, which not only reduces the waste disposal cost, but also greatly increases the flocculation speed and effect of the pollutant.

The packaging of polyaluminium chloride is generally woven bag or kraft paper bag, which is moisture-proof, leak-proof and relatively tough. The main specifications are polyacrylamide 5 kg / bag or 25 kg / bag.
Since polyaluminum chloride has a unique water absorption, it is necessary to pay attention to its moisture-proof measures. The usually purchased polyaluminum chloride is preferably placed in a dry, clean environment.
If you can't use a package at a time, you can open it and repack it. Otherwise, after a period of time, the remaining polyaluminum chloride powder may aggregate, affecting the use effect. The order of production applications is not necessary.
Polyaluminium chloride has a certain shelf life and must be used before the shelf life.
The rate of dissolution of the polyaluminum chloride is closely related to the air temperature. When the temperature is high, the polyaluminum chloride can be dissolved at a relatively fast rate and can be half an hour. However, the dissolved polyaluminum chloride solution is rarely stored and is usually used within 24 hours. Otherwise, the viscous solution may break down into an aqueous liquid. In winter, the dissolution rate is slower than that of the polyaluminum chloride solution.