ABSTRACT Flocculation studies between dual polymers on pulp and paper mill wastewater are reported in this paper. The effects of different molecular weights of polyDADMAC and different dosages of Polyacrylamide (PAM) were studied. The molecular weights of polyDADMAC used were 8.8×104, 10.5×104 and 15.7×104 g/mol. The flocculation performance was analyzed in jar tests with PolyDADMAC and Polyacrylamide dosages ranging from 0.4-2.0 mg/L﹣1 and 0.4-8.0 mg/L﹣1 respectively. A higher molecular weight and a 6.0 mg/L﹣1 dosagepolyDADMAC gave the highest level of flocculation based on turbidity and TSS removal. In addition, increasing the molecular weight of PolyDADMAC increased ζ potential values approaching zero. This indicated that polyDADMAC acts as a destabilizer. Based on TSS, the addition of PAM will improve the size of microflocs created by polyDADMAC. It demonstrates that PAM acts as a bridger between microflocs.
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M. Razali, Z. Ahmad and A. Ariffin, "Treatment of Pulp and Paper Mill Wastewater with Various Molecular Weight of PolyDADMAC Induced Flocculation with Polyacrylamide in the Hybrid System," Advances in Chemical Engineering and Science, Vol. 2 No. 4, 2012, pp. 490-503. doi: 10.4236/aces.2012.24060.
 H. Tanaka and H. Ichiura, “A Novel and Simple Method for Determining the Cationic Demand of Suspensions Using Chromophoric Labeled Cationic Polymers,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 159, No. 1, 1999, pp. 103-107.
 M. Aguilar, J. Sáez, M. Lloréns, A. Soler and J. F. Ortu?o “Microscopic Observation of Particle Reduction in Slaughterhouse Wastewater by Coagulation-Flocculation Using Ferric Sulphate as Coagulant and Different Coagulant Aids,” Water Research, Vol. 37, No. 9, 2003, pp. 2233-2241. doi:10.1016/S0043-1354(02)00525-0
 A. L. Ahmad, S. Ismail and S. Bhatia, “Optimization of Coagulation-Flocculation Process for Palm Oil Mill Effluent Using Response Surface Methodology,” Environmental Science & Technology, Vol. 39, No. 8, 2005, pp. 2828-2834. doi:10.1021/es0498080
 L.-J. Wang, et al., “A Water-Soluble Cationic Flocculant Synthesized by Dispersion Polymerization in Aqueous Salts Solution,” Separation and Purification Technology, Vol. 67, No. 3, 2009, pp. 331-335.
 Q. Chang, X. K. Hao and L. L. Duan, “Synthesis of Crosslinked Starch-Graft-Polyacrylamide-co-Sodium Xanthate and Its Performances in Wastewater Treatment,” Journal of Hazardous Materials, Vol. 159, No. 2-3, 2008, pp. 548-553. doi:10.1016/j.jhazmat.2008.02.053
 X. Yu and P. Somasundaran, “Enhanced Flocculation with Double Flocculants,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 81, 1993, pp. 17-23. doi:10.1016/0927-7757(93)80231-3
 A. L. Ahmad, et al., “Improvement of Alum and PACl Coagulation by Polyacrylamides (PAMs) for the Treatment of Pulp and Paper Mill Wastewater,” Chemical Engineering Journal, Vol. 137, No. 3, 2008, pp. 510-517.
 M. R. Wu and T. G. M. Van de Ven, “Flocculation and Reflocculation: Interplay between the Adsorption Behavior of the Components of a Dual Flocculant,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 341, No. 1-3, 2009, pp. 40-45.
 M. Lemanowicz, A. Gierczycki and M. H. Al-Rashed, “Dual-Polymer Flocculation with Unmodified and Ultrasonically Conditioned Flocculant,” Chemical Engineering and Processing: Process Intensification, Vol. 50, No. 1, 2010, pp. 128-138.
 S. Chitikela and S. K. Dentel, “Dual-Chemical Conditioning and Dewatering of Anaerobically Digested Biosolids: Laboratory Evaluations,” Water Environment Research, Vol. 70, No. 5, 1998, pp. 1062-1069.
 D. Tao, J. G. Groppo and B. K. Parekh, “Enhanced Ultrafine Coal Dewatering Using Flocculation Filtration Processes,” Minerals Engineering, Vol. 13, No. 2, 2000, pp. 163-171. doi:10.1016/S0892-6875(99)00162-4
 E. Sabah, H. Yuzer and M. S. Celik, “Characterization and Dewatering of Fine Coal Tailings by Dual-Flocculant Systems,” International Journal of Mineral Processing, Vol. 74, No. 1-4, 2004, pp. 303-315.
 S. Mathur, P. Singh and B. Moudgil, “Advances in Selective Flocculation Technology for Solid-Solid Separations,” International Journal of Mineral Processing, Vol. 58, No. 1-4, 2000, pp. 201-222.
 A. Swerin, L. ?dberg and L. W?gberg, “An Extended Model for the Estimation of Flocculation Efficiency Factors in Multicomponent Flocculant Systems,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 113, No. 1-2, 1996, pp. 25-38.
 B.-U. Cho, et al., “A Bridging Model for the Effects of a Dual Component Flocculation System on the Strength of Fiber Contacts in Flocs of Pulp Fibers: Implications for Control of Paper Uniformity,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 287, No. 1-3, 2006, pp. 117-125.
 K. Britt, “Retention of Additives during Sheet Formation,” Tappi, Vol. 56, No. 3, 1973, pp. 83-86.
 A. Swerin, G. Glad-Nordmark and L. Odberg, “Adsorption and Flocculation in Suspensions by Two Cationic Polymers: Simultaneous and Sequential Addition,” Journal of Pulp and Paper Science, Vol. 23, No. 8, 1997, pp. J389-J393.
 A. C. Rodrigues, et al., “Treatment of Paper Pulp and Paper Mill Wastewater by Coagulation-Flocculation Followed by Heterogeneous Photocatalysis,” Journal of Photochemistry and Photobiology A: Chemistry, Vol. 194, No. 1, 2008, pp. 1-10. doi:10.1016/j.jphotochem.2007.07.007
 S. Wong, et al., “Treatment of Pulp and Paper Mill Wastewater by Polyacrylamide (PAM) in Polymer Induced Flocculation,” Journal of Hazardous Materials, Vol. 135, No. 1-3, 2006, pp. 378-388.
 M. A. A. Razali, et al., “Treatment of Pulp and Paper Mill Wastewater with Various Molecular Weight of PolyDADMAC Induced Flocculation,” Chemical Engineering Journal, Vol. 166, No. 2, 2011, pp. 529-535.
 A. McFarlane, et al., “The Influence of Flocculant Adsorption Kinetics on the Dewaterability of Kaolinite and Smectite Clay Mineral Dispersions,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 317, No. 1-3, 2008, pp. 39-48.
 R. Subramanian, S. Zhu and R. Pelton, “Synthesis and Flocculation Performance of Graft and Random Copolymer Microgels of Acrylamide and Diallyldimethylammonium Chloride,” Colloid & Polymer Science, Vol. 277, No. 10, 1999, pp. 939-946. doi:10.1007/s003960050473
 R. Shatat, et al., “The Effect of Molecular Weight and Charge Density on Floc Size Distribution of Palm Oil Effluent Flocculated with Cationic Polyelectrolytes,” Journal of Basic and Applied Sciences, Vol. 4, No. 2, 2008, pp. 95-103.
 X. H. Zhang, et al., “Flocculation of Reed Pulp Suspensions by Quaternary Chitosan Nanoparticle SiO2 Retention Aid Systems,” Journal of Applied Polymer Science, Vol. 117, No. 2, 2010, pp. 742-749. doi:10.1002/app.30230
 B. J. Lee, “Experimental and Modeling Studies for Optimizing Flocculant-Aided Sediment Retention Ponds,” Clemson University, Clemson, 2008.
 J. Packman, K. Comings and D. Booth, “Using Turbidity to Determine Total Suspended Solids in Urbanizing Streams in the Puget Lowlands,” Confronting Uncertainty: Managing Change in Water Resources and the Environment, Canadian Water Resources Association Annual Meeting, Vancouver, 27-29 October 1999, pp. 158-165.
 D. Pavanelli and A. Bigi, “Indirect Methods to Estimate Suspended Sediment Concentration: Reliability and Relationship of Turbidity and Settleable Solids,” Biosystems Engineering, Vol. 90, No. 1, 2005, pp. 75-83.
 C.-Y. Yin, “Emerging Usage of Plant-Based Coagulants for Water and Wastewater Treatment,” Process Biochemistry, Vol. 45, No. 9, 2010, pp. 1437-1444.
 N. Denkov, et al., “Mechanism of Formation of Two-Dimensional Crystals from Latex Particles on Substrates,” Langmuir, Vol. 8, No. 12, 1992, pp. 3183-3190.
 C. Tripp and M. Hair, “Controlled Flocculation-Deflocculation Behavior of Adsorbed Block Copolymers in Colloidal Dispersions by Modifying Segment/Surface Interactions: The Use of Small Displacer Molecules to Selectively Cleave Interparticle Bonds,” Langmuir, Vol. 10, No. 11, 1994, pp. 4031-4038. doi:10.1021/la00023a022
 C. Tavares, et al., “Ultrafiltration/Complexation Process for Metal Removal from Pulp and Paper Industry Wastewater,” Desalination, Vol. 144, No. 1-3, 2002, pp. 261-265. doi:10.1016/S0011-9164(02)00325-9
 L. C. Li and Y. Tian, “Encyclopedia of Pharmaceutical Technology,” In: Zeta Potential, 2nd Edition, Marcel Dekker, Inc., New York, 2002, p. 3020.
 Y. Zhou and G. V. Franks, “Flocculation Mechanism Induced by Cationic Polymers Investigated by Light Scattering,” Langmuir, Vol. 22, No. 16, 2006, pp. 6775-6786.