Nonionic polyacrylamide MAGNAFLOC-351 SSK is a high-molecular-weight, water-soluble polymer widely used in solid–liquid separation processes across industrial wastewater treatment, mineral processing, municipal sludge management, and chemical processing. As part of the MAGNAFLOC product line (formerly from Ciba and then BASF/Solvay), MAGNAFLOC-351 SSK is designed to provide excellent flocculation efficiency in applications where water chemistry is complex, where cationic or anionic polymers perform poorly, or where the suspended solids exhibit low surface charge.
Because it is nonionic, MAGNAFLOC-351 SSK offers unique advantages:
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High performance in high-salinity or high-hardness waters
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Stability in systems with varying pH
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Excellent floc formation with organic solids, colloidal fines, and neutral-charged particles
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Compatibility with coagulants such as alum, PACl, ferric chloride, and polyamines
Its outstanding bridging capability makes it a versatile flocculant in both primary clarification and sludge dewatering.
1. Municipal Wastewater and Sludge Treatment
Nonionic polyacrylamide MAGNAFLOC-351 SSK plays an important role in municipal wastewater treatment, particularly in systems where solids do not respond efficiently to anionic or cationic polymers. Municipal sludges often contain a mixture of organic solids, biological flocs, and minor inorganic particles. MAGNAFLOC-351 SSK is used for:
• Sludge Thickening
In gravity thickeners and DAF units, it increases solids concentration by forming compact and stable flocs that settle more rapidly.
• Sludge Dewatering
It enhances performance on:
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Belt filter presses
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Centrifuges
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Chamber filter presses
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Screw presses
The nonionic polymer produces uniform flocs that release water easily, improving cake solids and reducing polymer consumption.
• Secondary Effluent Clarification
MAGNAFLOC-351 SSK improves turbidity removal in secondary clarifiers, especially when biological flocs are fragile or when plants experience shock loads.
Its neutral charge minimizes interference with varying wastewater chemistry, making it suitable for plants experiencing fluctuating influent quality.
2. Industrial Wastewater Treatment Applications
Many industries generate wastewater streams containing low-charge or neutral organic solids, dyes, oils, and colloidal impurities. MAGNAFLOC-351 SSK is used in:
• Textile & Dye Wastewater
Nonionic PAM is effective for:
Its nonionic structure performs reliably in water with high dye concentration and pH fluctuations.
• Petrochemical and Refining Wastewater
Used for:
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Clarifying oily wastewater
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Removing polymeric contaminants
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Improving DAF flotation efficiency
Nonionic PAM remains effective even in the presence of hydrocarbons and surfactants.
• Pulp & Paper Industry
Applications include:
Since the polymer does not interfere with papermaking additives, it is suitable for sensitive process water loops.
• Metal Finishing & Electroplating
Here, MAGNAFLOC-351 SSK is used to settle:
It performs well in acidic or alkaline wastewaters with high ionic strength.
3. Mining & Mineral Processing
One of the most significant application areas for MAGNAFLOC-351 SSK is in mining and mineral beneficiation. Many mineral suspensions have low or mixed surface charges, making nonionic flocculants ideal.
• Tailings Thickening
It is used to accelerate settling of:
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Clay fines
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Silica
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Alumina
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Iron oxide residues
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Mixed mineral slurries
MAGNAFLOC-351 SSK increases underflow density, reduces water content in tailings, and enhances water recovery.
• Concentrate Dewatering
In vacuum filters, pressure filters, and decanters, the polymer improves drainage and reduces moisture content of the recovered concentrate.
• Clarification of Process Water
Its neutral charge makes it effective in high-salinity or high-hardness waters used in mine processing circuits.
• Sedimentation Basins and Thickeners
MAGNAFLOC-351 SSK accelerates settling and stabilizes sludge bed formation, improving the loading capacity of thickeners.
4. Chemical Processing & Environmental Engineering
Nonionic flocculants like MAGNAFLOC-351 SSK are highly valued in chemical industries where water chemistry or solids composition changes frequently.
• Catalyst Recovery
Many catalysts have neutral or weak charge surfaces, and nonionic PAM helps aggregate fine catalyst particles for recovery and reuse.
• Fermentation & Bioprocessing Waste
The polymer enhances clarification of broth and removal of biomass in fermentation-based production sectors.
• Landfill Leachate Treatment
It is often used along with iron or aluminum coagulants to treat leachates rich in humic substances.
5. Advantages of MAGNAFLOC-351 SSK Across Industries
MAGNAFLOC-351 SSK provides a series of operational and economic benefits:
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Works under wide pH ranges, from acidic to alkaline conditions
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Stable in high-salinity and high-hardness waters
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Forms dense, strong flocs suitable for high-shear equipment
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Compatible with all major inorganic coagulants
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Reduces turbidity and TSS efficiently
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Improves water recycling in industrial processes
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Delivers high performance with low polymer dosage
Its versatility makes it a preferred choice in applications where water composition or solid properties are unpredictable.
Summary
MAGNAFLOC-351 SSK is a high-performance nonionic polyacrylamide used in municipal wastewater treatment, industrial effluent clarification, mining and mineral processing, and chemical manufacturing. Its neutral charge allows it to perform effectively in systems with variable water chemistry, neutral solids, high salinity, or high mineral content. With strong floc formation, excellent water release characteristics, and compatibility with all major coagulants, MAGNAFLOC-351 SSK is widely recognized as a reliable solution for solid–liquid separation across multiple industries.
