Poly Aluminium Chloride 31% (PAC 31% Yellow Powder) Water Treatment Bag 25kg

Poly Aluminium Chloride (PAC 31%) Yellow Powder – Inorganic Flocculant & Coagulant for Industrial Water & Wastewater Treatment (25Kg Bag)

Poly Aluminium Chloride 31% (commonly known as PAC 31%, chemical formula [Al₂(OH)ₙCl₆₋ₙ]ₘ) is a heavy-duty, high-efficiency macromolecular inorganic coagulant engineered for industrial effluent clarification and municipal raw water purification. Directly imported and distributed by THP Chemical from leading manufacturers in China (polyaluminium chloride china), this industrial-grade pac 31 yellow powder features a certified alumina content of Al₂O₃ ≥ 31.0% Min and a broad basicity of 60% – 90%. Manufactured in compliance with the national technical standard GB/T22627-2014, it demonstrates rapid micro-flocs aggregation, rapid sedimentation velocity, and minimal post-treatment pH depression. Packaged in moisture-proof 25kg bags, it is the premier chemical choice for environmental engineering contractors and processing facilities looking to buy pac 31 bulk with full COA and MSDS compliance.

Technical Specifications – Poly Aluminium Chloride PAC 31% Yellow Powder (Standard Specifications)

Key Technological Properties & Coagulation Mechanism

• High Active Alumina Potency (Al₂O₃ ≥ 31.0%): Compared to conventional low-grade coagulants, PAC 31% provides concentrated polynuclear cationic aluminum species. Upon dispersion in water, it instantly compresses the electrical double layer of negatively charged colloidal particles, collapsing the Zeta potential and initiating rapid charge neutralization.
• Optimized High Basicity (60% – 90%): The high degree of pre-hydrolysis means that a substantial fraction of aluminum is already bound in stable polynuclear complexes (such as Al13). Consequently, the chemical consumes less natural alkalinity from raw water during flocs formation, reducing the need for post-coagulation caustic soda (NaOH) neutralization by up to 70%.
• Fast Flocculation & High Sedimentation Velocity: Polymeric chain bridging connects colloidal micro-flocs into large, dense agglomerates. The resulting flocs sink 2 to 3 times faster than those generated by conventional alum, dramatically increasing the hydraulic loading capacity of clarifiers and DAF units.
• Low Insoluble Content (< 1.5%): Low insoluble solids ensure rapid dissolution without generating heavy sediment in preparation tanks, protecting metering pumps, suction strainers, and dosing valves from mechanical abrasion.
• Reduced Sludge Cake Volume: Because the required dosage is 30% to 50% lower than that of aluminium sulphate, the total dry mass and volume of sludge generated are substantially lower, significantly lowering sludge dewatering and disposal costs.

Industrial Applications across Water & Wastewater Treatment

Operating efficiently over a wide water pH range (pH 5.0 to 9.0), pac water treatment chemical is widely deployed across critical sectors:

• Industrial Wastewater Treatment: Primary chemical coagulation for wastewater generated from textile dyeing, paper mills, electroplating, leather tanning, and seafood processing. Effectively removes total suspended solids (TSS), insoluble heavy metals, colloidal COD, and residual color.
• Pulp & Paper Mill Effluent: Facilitates fine fiber and cellulose recovery from white water circuits, accelerates closed-loop water recirculation, and clarifies discharged mill effluent.
• Municipal & Raw Surface Water Treatment: Core primary coagulant for municipal water plants drawing from rivers and reservoirs with high seasonal turbidity, removing colloidal clays and organic silt before sand bed filtration.
• Aquaculture Pond Preparation: Clarifies surface water reservoirs, rapidly settling suspended sediment and colloidal clays to provide crystal-clear water prior to stocking intensive shrimp or fish ponds.
• Mining & Mineral Processing: Solid-liquid separation in coal washing tailings, aggregate washing circuits, and metal ore processing wash waters.

Standard Dosing Rates, Preparation & Warehouse Storage

• Working Solution Preparation:
  • Dissolve dry PAC powder in clean water to create a 5% – 10% (wt) aqueous stock solution prior to dosing (e.g., dissolve 5 – 10 kg of powder in 100 Litres of water).
  • Agitate mechanically for 10 to 15 minutes to achieve complete dissolution before metering into the flash-mixing chamber.
• Practical Application Dosing Rates:
  • Raw Surface / Municipal Water Treatment: Apply 1 – 10 g/m³ (ppm) depending on raw water turbidity (can be increased to 10 – 20 g/m³ during seasonal flood peaks).
  • Industrial Wastewater Treatment: Apply 20 – 100 g/m³ (ppm), or 100 – 300 g/m³ for heavily contaminated effluents such as textile dye wash or printing inks.
  • Technical Recommendation: Always conduct laboratory Jar-tests to optimize the exact chemical coagulation setpoint and combine with 0.5 – 1.0 ppm of Anionic Polyacrylamide (PAM) to maximize floc size and settling velocity.
• Warehouse Storage Protocol: Store bags sealed on pallets in a dry, well-ventilated warehouse away from direct rain, high heat, and intense sunlight. Tightly twist and tie the inner plastic liner after opening to protect the powder from atmospheric moisture absorption.

Commercial Supply Policy at THP Chemical

Tan Hung Phu Chemical Co., Ltd. (THP Chemical) is a direct importer and authorized distributor of Poly Aluminium Chloride PAC 31% (China) supplying environmental contractors and manufacturing plants nationwide:

• 100% genuine factory direct imports, strictly compliant with the GB/T22627-2014 testing standard with Al₂O₃ ≥ 31.0% Min.
• Standard industrial packaging: 25kg double-layer bags with moisture-proof inner liners and fresh production dates (24 months shelf life).
• Comprehensive compliance documentation: Batch-specific Certificate of Analysis (COA), complete Material Safety Data Sheet (MSDS), and legal VAT invoices provided with each dispatch.
• Substantial ready inventory maintained at our Ho Chi Minh City central warehouse, supporting prompt palletized truckload or containerized delivery nationwide.

Frequently Asked Questions (FAQ)

1. Why is PAC 31% yellow powder preferred over traditional aluminium sulphate?

PAC 31% contains pre-formed polynuclear complexes with 60% – 90% basicity, allowing flocs to form and settle 2 to 3 times faster than conventional alum. It consumes significantly less natural alkalinity, minimizes pH drop, works across a broader pH spectrum, and cuts overall sludge volume by 30% to 50%.

2. Does the yellow color of the powder cause discoloration in the treated effluent?

No. The yellow appearance is natural for technical-grade PAC containing a minor iron content (Fe < 5.0%), which acts as a secondary weighting coagulant. When dosed correctly, all aluminum and iron hydrolyze and settle completely with the sludge cake, leaving the clarified water clear and colorless.

3. Is it necessary to add polymer flocculants alongside PAC 31%?

For low to moderate turbidity water, PAC 31% alone is often sufficient. However, for heavily loaded wastewater (such as textile dyeing or electroplating), co-dosing an Anionic Polyacrylamide (PAM at 0.5 – 1.0 ppm) after PAC rapidly bridges micro-flocs into heavy macro-flocs, dramatically speeding up clarification in clarifiers or DAF systems.

4. Does THP Chemical provide Jar-test samples and bulk commercial quotations?

Yes. THP Chemical provides complimentary Jar-test samples for industrial laboratory evaluation, along with competitive wholesale quotations based on monthly or annual tonnage commitments, complete with batch-specific COAs and full MSDS documentation.