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Can polyacrylamide and polyaluminum chloride be used at the same time?
In fact, in ordinary sewage treatment, some sewage cannot be achieved by using a single flocculant. It must be used in combination. The use of inorganic flocculant PAC and polyacrylamide composite flocculant will achieve better results. The effect, but pay attention to the order when adding the medicine. If the order is not correct, the effect will not be achieved.
The order of adding polyacrylamide and other flocculants:
When using composite flocculants, you must pay attention to the order of addition and the time interval of dosing! The combined use of PAC and PAM is to let PAC complete the neutralization of charge/colloid destabilization to form flocs, and further increase the volume of flocs to facilitate full precipitation. Because the reaction time of polyaluminum chloride PAC is very short, it needs to be mixed strongly after adding. PAM has a long action time. The mixing should be strong first and then weak-first strong is to mix well and then weak to avoid flocs! Polyacrylamide is a flocculant, and polyaluminum chloride is a coagulant. Under normal circumstances, the coagulant is added first and then polyacrylamide, but for the sake of simplicity, it is recommended that you determine the order of addition through experimental results! Dosing point, dosing amount, dosing time and mixing strength need to be determined by experiment. Remember that you must not use the two drugs together, otherwise it will affect the effect and increase the cost of use.
Judgment of the failure of polyacrylamide flocculant:
Many sewage treatment plants are often encountered, especially in the south. Due to the climate, the polyacrylamide of some sewage plants has been stacked for a long time or the packaging mouth is not tightly tightened to absorb moisture. For the agglomeration of polyacrylamide flocculants, many People have doubts whether it has expired and whether it can be used again. In fact, as long as you can dissolve it and the aqueous solution has viscosity, it will not fail. However, the agglomerated polyacrylamide is difficult to dissolve. In fact, it also means a waste of resources. In fact, the shelf life of different types of polyacrylamide is very different. This is related to its structure. Relatively speaking, the shelf life of anionic polyacrylamide is longer. Generally, we stipulate that the shelf life of cationic polyacrylamide is 1 year. Exceeding this period shall be deemed to have exceeded the shelf life. There is a risk of failure,
The failure of polyacrylamide can be judged from two aspects, one is the viscosity, and the other is the deterioration of the flocculation effect.