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Anionic Polyacrylamide Powder (APAM) for Water Treatment
Property:
Anionic polyacrylamide possesses four core characteristics. It can be efficiently applied in multiple scenarios such as wastewater treatment. The negatively charged carboxyl groups (hydrolysis degree of 10~35%) within the anionic polyacrylamide molecule specifically adsorb positively charged colloids and metal hydroxides. This facilitates the formation of coarse flocs from inorganic precipitates like Al(OH)₃ and Fe(OH)₃. Its ultra-high molecular weight (12~25 million) enables a single polymer chain to simultaneously bridge multiple particles, generating compact flocs measuring 2~5 mm. These flocs exhibit a settling velocity 3~8 times faster than when using aluminum salts alone. Anionic polyacrylamide exhibits low dissolution viscosity (approximately 30~80 cP at 0.1% concentration) and dissolves completely within 30 minutes in cold water. This property is highly compatible with pumps, pipelines, and metering systems. Clogging and gelation issues are virtually nonexistent. Anionic polyacrylamide exhibits a broad effective pH range (6~14). It maintains stable negative charge in alkaline wastewater without losing efficacy due to charge reversal.
Specification:
| Products | Product Name | Degree of Hydrolysis | Molecular Weight | Application |
|---|---|---|---|---|
| Anionic PAM Powder | IROFLOC345 | Medium Low | Medium High | Wastewater Treatment |
| Anionic PAM Powder | IROFLOC456 | Medium | Medium | |
| Anionic PAM Powder | IROFLOC556 | Medium | High | |
| Anionic PAM Powder | IROFLOC656 | High | High | |
| Anionic PAM Powder | IROFLOC634 | High | Medium | |
| Anionic PAM Powder | IROFLOC756 | High | Medium | Enhanced Oil Recovery
(EOR) |
| Anionic PAM Powder | IROFLOC767 | Very High | Medium | |
| Anionic PAM Powder | IROFLOC689 | Super High | High | |
| Anionic PAM Powder | IROFLOC589 | Super High | High | |
| Anionic PAM Powder | IROFLOC523 | Medium | Low | Drilling Fluid in Oilfield |
| Anionic PAM Powder | IROFLOC689 | High | Super High | |
| Anionic PAM Powder | IROFLOC756 | High | High | |
| Anionic PAM Powder | IROFLOC556 | Medium | High | Oil field fracturing
fluid drag reducer |
| Anionic PAM Powder | IROFLOC756 | High | High | |
| Anionic PAM Powder | IROFLOC767 | High | Very High | |
| Anionic PAM Powder | IROFLOC689 | Medium High | Super High | |
| Anionic PAM Powder | IROFLOC589 | High | Super High | |
| Anionic PAM Powder | IROFLOC345 | High | Super High | Oil field profile control
and Water plugging |
| Anionic PAM Powder | IROFLOC556 | High | Super High | |
| Anionic PAM Powder | IROFLOC589 | High | Super High | |
| Anionic PAM Powder | IROFLOC345 | Low | Medium High | Mining |
| Anionic PAM Powder | IROFLOC556 | Medium | Medium | |
| Anionic PAM Powder | IROFLOC65L | High | High | |
| Anionic PAM Powder | IROFLOC161 | Low | Medium | Paper Making |
Uses:
1. Industrial Wastewater: Enhanced Flocculation and Sedimentation Performance
Anionic polyacrylamide is suitable for high-turbidity, high-color wastewater from steel, electroplating, mineral processing, coal washing, and textile dyeing industries.
Procedure: First add inorganic coagulant (PAC 30~100 mg/L or ferrous sulfate 50~200 mg/L). After 30 seconds, add anionic polyacrylamide 0.5~2 mg/L (based on pure solids).
Effect: Suspended solids (SS) can be reduced from 1000 mg/L to less than 20 mg/L, color removal rate reaches 60~90%, and sludge volume decreases by 30~50%.
2. Optimization of Advanced Phosphorus Removal Process for Municipal Wastewater
Adding anionic polyacrylamide at 0.3~1mg/L at the end of high-efficiency sedimentation tanks (magnetic coagulation, sand-loaded) can reduce TP below 0.2 mg/L, meeting DB Class IA or even quasi-Class IV standards.
3. Emergency Treatment Strategy for High-Turbidity Raw Water
When raw water NTU reaches 1000~5000, using anionic polyacrylamide 0.2~0.5 mg/L and PAC 10~20 mg/L reduces NTU to < 10 within 30 minutes, instantly boosting plant capacity by over 40%.
4. Sludge Dewatering Performance Improvement
For municipal residual sludge with 99.2% moisture content, pre-treating with anionic polyacrylamide at 3~5 kg/t DS followed by rapid mixing for 30 seconds and slow mixing for 90 seconds reduces specific resistance from 1*1013 m/kg to 3*1012 m/kg. This boosts dewatering machine capacity by 25% and further lowers cake moisture content by 2~3 percentage points.
Usage:
1. Dissolution
Concentration: 0.05%~0.1% (higher concentrations waste the solution tank; lower concentrations promote degradation).
Water Quality: Deionized water or tap water with hardness < 100 mg/L (CaCO3). High hardness forms calcium carboxylate gel, reducing activity by 30%.
Equipment: Stainless steel/PE tank + variable-frequency screw feeder, agitation line speed 1~1.5 m/s. Do not use centrifugal pumps for circulation (causes molecular chain shearing).
Temperature: Room temperature sufficient; heating to 25~30°C at < 15°C reduces dissolution time by 20%, but strictly avoid > 60°C.
2. Dosing Point
Pipeline Mixing: Inject 0.3~0.5m upstream of the static mixer to ensure 1~2s hydraulic residence time, avoiding long-distance pipeline shear.
Two-Point Dosage: For highly turbid water (SS > 2000 mg/L), use 60% pre-dosage and 40% post-dosage to further increase sedimentation velocity by 10~15%.
3. Dose Determination
Laboratory: In a 1 L beaker, first adjust pH to 6~8. Add 50 mg/L PAC and stir vigorously for 1 min. Then add APAM in a gradient of 0.5, 1, 2, and 4 mg/L, stirring slowly for 2 min. Allow to settle for 10 min, then measure turbidity in the supernatant. Select the corresponding value for the lowest residual turbidity.
Field Application: Use 0.8 times the optimal pilot test value as the initial dosage. After continuous operation for 2 hours, fine-tune the dosage by ±10% based on feedback from the online SS monitor.
Package and Storage:
25Kg/bag(Powder), 25Kg/bag(Colloid), inner bag is PVC film, outer weaved plastic bags. Keep dry.
Synonyms:
Anionic polyacrylamide emulsion; Anionic polyacrylamide flocculant; China anionic polyacrylamide; Polyacrylamide 75; Polyacrylamide 50