Medium Cationic Polyacrylamide

Medium Cationic Polyacrylamide (CPAM) is a high-molecular-weight linear copolymer of acrylamide and cationic functional monomers, engineered with a medium charge density (20% to 40% molar substitution). It functions as an organic polymer flocculant to destabilize and aggregate negatively charged colloidal suspensions, fine organic particulates, and biological sludges. Supplied as a free-flowing granular powder, it dissolves in water to extend active macromolecular chains that neutralize surface charges and bridge adjacent particles into shear-resistant flocs.

Wetting & Inversion: Rapid particle dispersion in makeup water prevents partial hydration or gel block formation, ensuring 100% active chain uncoiling.

Kinetic Destabilization: Flash mixing initiates instantaneous charge neutralization, collapsing colloidal repulsion within 2 seconds.

Bridging & Sizing: Extended polymer chains bind micro-agglomerates into visible, resilient macro-flocs (3 mm to 5 mm diameter).

CST & Dewatering Yield: Significantly reduces Capillary Suction Time (CST) and increases final dewatered sludge cake dryness by 3% to 6% over low-cationic counterparts.

Municipal Activated Sludge: Secondary biological excess sludge from extended aeration and conventional activated sludge (CAS) systems.

Digested Biosolids: Anaerobically and aerobically digested municipal sludges requiring moderate charge density conditioning.

Papermaking Effluent: Dissolved Air Flotation (DAF) clarifier feed and fiber recovery circuits utilizing recycled pulp furnish.

Food Processing Wastewater: Effluent streams from slaughterhouses, dairies, breweries, and edible oil processing with high organic loads and fats.

Chemical & Pharmaceutical Residues: Industrial wastewater treatment waste streams containing mixed organic compounds and metal hydroxide co-precipitates.

Zeta Potential Measurement: Determine the surface charge of suspended solids to confirm if the matrix falls within the moderate negative range.

Equipment Matching:

• Decanter Centrifuges: Require higher molecular weight and balanced charge to resist high rotational shear forces.
• Belt Filter Presses: Require high floc elasticity and rapid free drainage across gravity zones.
• Screw Presses: Require bulky, flexible flocs that allow continuous filtrate release under progressive internal pressure.
• Bench-Scale Screening: Run jar tests across 20%, 30%, and 40% charge variants at constant molecular weight to define the minimal effective dosage.

Makeup Concentration: Prepare working solutions at 0.1% to 0.5% weight/volume. Dust dry powder slowly into the vortex of clean water (20°C to 25°C). Avoid high-shear impellers.

Hydration Time: Allow 45 to 60 minutes of gentle agitation for complete chain uncoiling prior to dosing.

Jar Testing Protocol:
1.Measure 500 mL of representative sludge into a standard beaker.
2.Add exact volumes of 0.1% working solution via pipette.
3.Flash mix at 200 rpm for 30 seconds.
4.Flocculate at 40 rpm for 60 seconds.
5.Evaluate settling velocity, supernatant clarity, and floc structure.

Manufactured via aqueous solution polymerization, followed by precision gel drying, mechanical crushing, and classification.

Polymerization Synthesis: Temperature-regulated batch reactors control radical initiation to achieve target molecular weight distribution.

Milling & Screening: Pulverized product passes through multi-deck vibratory screens to isolate specific particle size distributions (20–60 mesh), eliminating oversize agglomerates and fines.

Quality Assurance: Every production batch undergoes strict laboratory testing for active polymer content, residual monomer concentration via HPLC, bulk density, dissolution rate, and Brookfield viscosity before release.

Standard Bags: 25 kg multi-layer kraft paper bags featuring an inner polyethylene moisture-barrier liner, palletized and stretch-wrapped (40 bags / 1,000 kg per wooden pallet).

Bulk Bags (FIBC): 750 kg to 1,000 kg heavy-duty polypropylene jumbo bags equipped with bottom discharge spouts.

Storage Environment: Store in original unopened packaging within a cool, dry, ventilated warehouse (5°C to 35°C). Prevent moisture exposure. Spilled powder creates extreme slipping hazards when wet.

Shelf Life: 24 months from the date of manufacture under recommended storage conditions.