Application of Polyacrylamide (PAM) in Chemical Plant Wastewater Treatment
Polyacrylamide (PAM) plays a multidimensional role in chemical plant wastewater treatment, covering pollutant removal, sludge treatment, and water quality optimization. Below are specific application scenarios and technical characteristics:
I. Pollutant Removal and Water Purification
1）Suspended Solids and Colloid Treatment
PAM rapidly aggregates suspended particles and colloids in wastewater through charge neutralization and adsorption bridging, forming large flocs that accelerate sedimentation. For example, chemical wastewater containing heavy metals or organic pollutants shows significantly improved suspended solids removal efficiency after treatment with anionic PAM
2）Organic Matter and Heavy Metal Removal
PAM selectively adsorbs and precipitates complex organic pollutants (e.g., dyes, oils) and heavy metal ions. For instance, amphoteric PAM achieves high flocculation efficiency in refinery wastewater, simultaneously removing oil contaminants and suspended solids
3）pH Adaptability
Non-ionic PAM is suitable for acidic wastewater treatment (e.g., pickling wastewater) via physical entanglement, while cationic PAM performs better in neutral/alkaline conditions, particularly for oily wastewater
II. Optimization of Sludge Treatment Processes
1）Gravity Dewatering and Pressure Filtration Enhancement
Cationic PAM neutralizes the negative surface charges of sludge particles, strengthening floc structure and improving filtration efficiency. After introducing cationic PAM, a chemical plant reduced sludge moisture content from 98% to <75%, lowering disposal costs
2）Specialized Sludge Treatment
For sludge containing refractory organics (e.g., petrochemical sludge), amphoteric PAM overcomes limitations of single-ion-type products through synergistic effects, enhancing dewatering performance and enabling resource recovery
III. Type Selection and Process Compatibility
|
PAM Type
|
Application Scenarios
|
Technical Advantages
|
| Anionic (APAM) |
High-suspended solids wastewater (e.g., metallurgical) |
High molecular weight, strong bridging |
| Cationic (CPAM) |
Oily sludge dewatering (e.g., petrochemical) |
Efficient charge neutralization, dense flocs |
| Non-ionic (NPAM) |
Strongly acidic or high-salinity wastewater (e.g., pickling) |
High electrolyte resistance |
| Amphoteric |
Complex-pollutant wastewater (e.g., multipurpose chemical) |
Combines anionic/cationic properties |
IV. Cost Efficiency
Only 7–30 grams of PAM is required per ton of wastewater, with low transportation/storage costs, outperforming traditional coagulants.
Hengfeng has polyacrylamide for the treatment of Chemical plant wastewater. Hengfeng provide service including inquiry, lab test and pilot test. We provide not only products but also service. We will choose the suitable polyacrylamide according to the cement product and construction requirement to achieve the best using effect and experience.
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