How do cationic polyacrylamide type flocculants compare with reverse demulsifiers?

Three cationic polyacrylamide type flocculants were paired with reverse demulsifiers to assess the synergistic separation performance. Their main differences are the active component content, molecular weight, and charge density. The same OPW with the oil content of 665 mg/L was used for evaluation.

How cationic flocculant is used to treat oily wastewater?

Cationic flocculant is adopted to treat oily wastewater due to its high-efficient flocculation speed and the effectiveness of oil removal. An effective flocculant enables to compress the electric double layer of the oil droplet and decrease the strength of interface film .

Can polyacrylamide & poly Aluminium chloride be used in wastewater treatment?

Field applications indicate that polyacrylamide (PAM) and poly aluminium chloride (PAC) are capable of dealing with diverse types of wastewater [4, , , , ]. The flocs formed by applying PAC are small, loose, and unstable. Yet flocs generated by cationic PAM are tight and more stable .

Can polyacrylamide be used to treat oily wastewater?

Furthermore, partially hydrolyzed polyacrylamide was applied to treat oily wastewater . A modified polysilicate aluminum ferric sulfate (PSAFS) was compounded by introducing magnesium sulfate, zinc sulfate, and manganese sulfate .

Is polyamine a good reverse demulsifier for o/w emulsion?

Polyamine is a highly efficient reverse demulsifier in demulsifying O/W emulsion. The combined PA and CPAM-2 could remove up to 90 % oil and 85 % suspended solids. PA-PAC exhibits comparable performance as PA and both outperform than PAC-QAS. Demulsification plays a more significant role than the flocculation in treating OPW.

Does PA remove oil & suspended solids from OPW?

PA has been proved to be an effective reverse demulsifier in removing oil and suspended solids from the OPW, because it is highly surface-active and can absorb at the oil-water interface, displacing the natural surfactants and weakening the interface film strength to promote the collision and coalescence of small oil droplets.