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The coagulation/flocculation is a major process in the wastewater treatment. A study was conducted to compare the efficiency of two polymeric PAC coagulants (PAC, PAX 61) and two monomeric coagulants, Al2(SO4)3 andAlCl3,in pulp and paper wastewater treatment. PAC and PAX 61 showed the advantage over the traditionally used Al2(SO4)3 and AlCl3 in the removal of basic wastewater pollutants. The use of...
Results of sedimentation tests conducted on pulp and paper wastewater were compared with the results of macroscopic photographic analysis of silica aggregate suspensions. The peak effectiveness of the phase separation was achieved with the use of cationic polymer Z63 which – when used together with polyaluminium chloride (PAC) – reduced the volume of sludge by up to 38% compared to PAC alone. Used...
The study analyzed sizes of aggregates produced in the coagulation process of silica with the use of an inorganic coagulant Al₂(SO₄)₃ and three organic polymers: cationic (Z63), anionic (P2540) and non-ionic (N300). Sizes of the formed flocs were measured with the macroscopic photographic method. The greatest size of the flocs (R=0.77 mm) at a fall rate of V=6.45 mm s⁻¹ was achieved upon the use of...
Coagulation/flocculation of a suspension of silica SiO2 was carried out with the use of macromlecular organic polymers which supported the action of two inorganic coagulants – PACl and Al₂(SO₄)₃. The results indicate the exceptional effectiveness of cationic and anionic flocculants in coagulation with Al₂(SO₄)₃ and an anionic polymer P 2540 in combination with PACl. They also show the correlation...
A study was carried out into sedimentation of sludge obtained in the process of coagulation-flocculation of pulp and paper wastewater with the use of PAC and organic polymers. An attempt was made to evaluate the effect of various organic polyelectrolytes on phase separation effectiveness. It was found that the application of cationic polymers at a dose of 1 mg dm⁻³ and 1.5 mg dm⁻³ (Z 63 and Z 92,...
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