flocculant
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What is the effect of using polyferric and polyaluminum compounds together?
For some wastewater types, a combination of the two methods yields better results. There are now companies that have developed polyaluminum ferric sulfate coagulants, which can be found by searching online.
Polymer coagulants based on aluminum and iron work well in the printing and dyeing industry, offering good results in Korean-style applications. However, their effectiveness in waters contaminated primarily with SS is uncertain; in industries such as glass processing and ceramic manufacturing, such coagulants are not as effective as plain aluminum polymers.
The price of polyaluminum is higher than that of polyiron; using them together can achieve good results at a lower cost
OP, it doesn’t make much sense to mix them directly. Of course, it doesn’t mean that the components are completely independent; there is still some interaction, but its practical significance is minimal. In terms of treatment efficiency, there is little difference when dealing with ordinary wastewater or tap water at the same molar concentration; however, for certain types of wastewater, such as those for which polyferric salts are effective, mixing them with other substances results in poor performance, and the same holds true when PAC is used.
Hehe, actually it’s not necessary; it depends on what industry you’re in and what the problem is. Iron is also expensive; there’s no special requirement for PAC to be used together with polyacrylamide, and the results in practice are quite good
If there are no special requirements, PAC and polyacrylamide will suffice
Is it better for mixing? What is the optimal ratio?
It is possible to use a mixture of flocculants in some cases, but no one can guarantee whether it will work well or not. This is something discussed here, but in practical applications, several parallel experiments should be conducted under suitable conditions, so that it becomes clear whether the method works effectively or not. The following are my personal opinions for your reference. When using flocculants, it’s possible that none of the available chemicals meet the desired requirements; in such cases, it’s necessary to find some industrial raw materials or even industrial waste and use them to prepare the flocculant oneself. The substance to be used should be determined based on the quality of the water; the goal, of course, is to have a chemical reaction that results in the formation of precipitates.
You can use polyacrylamide.