Are cationic and anionic polyacrylamides effective in flocculation of pulp and paper mill wastewater?

The flocculation performances of nine cationic and anionic polyacrylamides with different molecular weights and different charge densities in the treatment of pulp and paper mill wastewater have been studied.

Which cationic polyacrlyamide has the highest flocculation efficiency?

Cationic polyacrlyamide Organopol 5415 with very high molecular weight and low charge density is found to give the highest flocculation efficiency in the treatment of the paper mill wastewater.

Can polyacrylamide flocculant improve water purification capacity?

Using organic polyacrylamide flocculant instead of inorganic flocculant, even don’t modify the sedimentation tank, it can increase water purification capacity by more than 20%. In sewage treatment, the use of PAM flocculant can increase the utilization rate of water recycling and can also be used for sludge dewatering.

Can polyacrylamide be used alone in coagulation–flocculation process?

Based on the cost evaluation, the use of the polyacrylamides is economically feasible to treat the pulp and paper mill wastewaters. This result suggests that single-polymer system can be used alone in the coagulation–flocculation process due to the efficiency of the polyacrylamide.

Can polyacrylamide be used to treat pulp and paper mill wastewater?

SVI values of less than 70 ml g −1 are found for all polyacrylamide at their respective optimum dosage. Based on the cost evaluation, the use of the polyacrylamides is economically feasible to treat the pulp and paper mill wastewaters.

Which coagulant & flocculant system is used in pulp and paper mill wastewater?

The coagulant–flocculant system For a combination of inorganic coagulant and polymeric flocculant applied to the treatment of pulp and paper mill wastewater, alum and PACl were used together with the best polyacrylamide, Organopol 5415.