Polyacrylamide and polyaluminum chloride should not be used simultaneously; they can only be used in combination, with one being added before the other. Polyacrylamide can be used alone for treating domestic wastewater, but industrial wastewater is more challenging to treat than domestic wastewater, with more complex treatment processes, leading to severe water pollution. Therefore, when treating industrial wastewater, it is often necessary to use polyaluminum chloride in conjunction with polyacrylamide to achieve good treatment results while also being cost-effective.
With the rapid development of industry, the types and quantities of wastewater have surged exponentially. In fact, when treating wastewater on a daily basis, some types of wastewater cannot be effectively treated with a single polyacrylamide. It is necessary to use a combination of two types. The use of aluminum chloride hexahydrate (PAC) in conjunction with polyacrylamide for wastewater treatment yields superior results. However, it is crucial to pay attention to the sequence of addition; improper sequence will also render the treatment ineffective.
When using aluminum chloride polymer, it is crucial to pay attention to the sequence of addition and the interval between doses! The combined use of aluminum chloride polymer with PAM involves allowing the aluminum chloride polymer to first neutralize the charge and destabilize the colloidal particles, forming fine flocs, and then further increasing the floc size to promote complete precipitation. Due to the short reaction time of aluminum chloride polymer (PAC), vigorous mixing is required after addition. The polyacrylamide has a longer action time, so the mixing should be done first strong then weak—the strong mixing is for even distribution and the weak mixing is to prevent destruction of the flocs! Polyacrylamide is a flocculant, and aluminum chloride polymer is a coagulant. Generally, aluminum chloride polymer is added before polyacrylamide, but for safety, it is recommended to determine the order of addition through experimental results! The dosing point, dosage, dosing time, and mixing strength should be determined by experimentation. Remember, never mix the two chemicals together, as it may affect the effectiveness and increase the cost of use!
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