Explore our high-performance water treatment chemical catalog. Fully optimized for high settling velocities, low sludge density, and maximum turbidity reduction.
A comprehensive review of the physical-chemical dynamics of Aluminum Sulfate [Al2(SO4)3] in industrial, municipal, and process water clarifying cycles.
Aluminum Sulfate introduces trivalent aluminum ions (Al3+) into solution, which aggressively destabilize negatively charged colloidal suspensions (clay, organic matter, color pigments) to initialize rapid micro-floc formation.
Upon dissolution, alum hydrolyzes to form polymeric aluminum hydroxides. Our technical configurations optimize the operational pH window (typically 5.5 to 7.5) to avoid soluble aluminum carryover and optimize coagulation speed.
At dosages exceeding solubility limits, Al(OH)3 precipitates rapidly as a gelatinous amorphous mass, capturing surrounding particulates in a sweep-floc mechanism that accelerates settling and leaves transparent supernatant.
In municipal and industrial wastewater applications, choosing the right aluminum sulfate flocculant grade is paramount. Industrial raw water often presents complex chemical matrices containing high chemical oxygen demand (COD), humic substances, and variable alkalinity levels. Our manufacturing processes produce high-grade iron-free and low-iron aluminum sulfate variants (both solid and liquid forms) to target these specific challenges. Utilizing high-purity raw bauxite and advanced pressure synthesis lines, we ensure an Al2O3 content exceeding 15.8% (for solids) and 8% (for liquids) with negligible heavy metal concentrations.
| Specification Parameter | Iron-Free Solid Alum | Low-Iron Solid Alum | Liquid Formulation (10%-15% PAC/Alum equivalent) |
|---|---|---|---|
| Al2O3 (Alumina Content) | ≥ 15.80% | ≥ 15.60% | ≥ 8.00% | Iron (Fe) Content | ≤ 0.005% | ≤ 0.50% | ≤ 0.02% |
| Water Insoluble Matter | ≤ 0.10% | ≤ 0.15% | ≤ 0.20% |
| pH Value (1% aqueous soln) | ≥ 3.0 | ≥ 3.0 | 2.0 - 3.5 |
| Heavy Metals (as Pb) | ≤ 0.001% | ≤ 0.002% | ≤ 0.0005% |
| Product Form | Flakes, Powder, Granular | Flakes, Granular | Colorless to Pale Yellow Liquid |
Founded in 1998, Wuxi BS Water Treatment Chemicals Co., Ltd. has established itself as an international pioneer in the synthesis and supply of advanced inorganic coagulants and organic polymeric flocculants. Strategically headquartered near Shanghai port in China, our digitalized synthesis facilities boast an annual production capacity exceeding 500,000 metric tons.
With a state-of-the-art laboratory facility and dedicated technical field support engineers, we deliver comprehensive water clarification solutions. Our product suite—spanning Polyaluminium Chloride (PAC), Polyacrylamide (PAM), Poly(diallyldimethylammonium chloride) (PDADMAC), and customizable Aluminum Sulfate blends—is trusted by municipal drinking water systems, heavy chemical processing units, pulp and paper manufacturers, and oilfields in over 60 countries.
Wuxi BS provides tailored molecular weight, ionic charge density, and custom active-ingredient concentrations to match local wastewater treatment requirements.
Our lab technicians offer comprehensive "water quality analyses," jar testing, and custom chemical formulation sizing to optimize dosing overhead.
With an annual sales footprint over 500,000 metric tons and advanced automated continuous reactors, we meet bulk seasonal spikes without supply disruptions.
Integrated raw materials storage, multi-port dispatch capabilities, and automated bag-fill lines guarantee predictable lead times across global routes.
We work alongside Chinese academic institutions to synthesize advanced low-basicity liquid coagulants and eco-friendly polymeric blends.
Since exporting globally in 2007, our logistical logistics cover bulk vessel loading, dry powder containers, Flexitank, and IBC totes configurations.
All compounds comply with REACH, ISO 9001, ISO 14001, and NSF/ANSI Standard 60, facilitating integration into regulated industrial systems.
Our formulations are engineered to provide maximum colloidal removal across diverse process-critical industrial applications.
Flocculants are critical for primary clarification, chemical phosphorus precipitation, and municipal sludge dewatering, yielding high cake solids during belt press processing.
Enhancing oil-water separation in produced water streams, emulsion breaking, and tertiary oil recovery polymers designed to perform under extreme shear and salinity conditions.
Protects downstream Reverse Osmosis (RO) systems from colloid fouling. Minimizes SDI (Silt Density Index) parameters, protecting high-cost membrane assets.
Acts as an acid sizing retention aid, pitch control agent, and drainage promoter on modern high-speed papermaking lines, significantly reducing process fresh-water consumption.
Highly refined low-iron and iron-free aluminum sulfate and high purity PAC-01 that meet international potable water standards for color, arsenic, and heavy metals elimination.
Accelerates tailing slurry sedimentation and coal wash water circuits, helping operations recycle process water internally while meeting strict zero-liquid-discharge (ZLD) regulations.
Enterprise procurement professionals purchasing Aluminum Sulfate Flocculants in bulk face a complex matrix of regulatory compliance, logistical hurdles, and efficiency targets. The transition toward green chemistries and strict discharge permits means that the chemical makeup of incoming coagulants is scrutinized more than ever before.
China continues to lead global synthesis of aluminum derivatives due to localized availability of prime raw materials like high-grade bauxite and pure hydrochloric/sulfuric acids. By integrating production lines directly within chemical industrial parks, Wuxi BS coordinates supply with minimal reliance on domestic overland shipments. This geographical consolidation minimizes supply chain shocks, cushioning our customers against global geopolitical turbulence and logistical delays.
Compliance is critical in water treatment. Global companies must meet localized standards such as US NSF/ANSI Standard 60 (drinking water treatment chemicals), EU REACH regulations, and regional EPA directives. Our manufacturing process includes rigorous batch ICP-MS trace metals testing to guarantee that trace impurities like arsenic, lead, cadmium, and chromium remain well below global regulatory thresholds. This documentation is provided alongside custom certificates of analysis (COA) for every shipment.
For nearly three decades, we have continuously scaled our synthesis lines, international logistics, and analytical laboratories.
The manufacturing factory was established, initiating domestic production of basic inorganic coagulants for East China municipalities.
Re-organized and renamed as Wuxi Bisheng Water Treatment Agent Co., Ltd. (Wuxi BS), adding high-molecular-weight polymers to the portfolio.
Officially entered global trade networks, establishing direct supply lines to international water treatment distribution networks.
Annual export sales exceeded $10,000,000 USD, serving large industrial operations across Europe, Asia, and North America.
Dedicated international export department established, backed by real-time logistics tracking and field-level technical support.
Demonstrable compliance with global standards, audited and verified by independent testing and quality assurance bodies.
Detailed chemical answers to key questions about Aluminum Sulfate, dosing mechanics, shelf-life, and procurement logistics.
Aluminum Sulfate functions best within a pH range of 5.5 to 7.5. At this range, insoluble aluminum hydroxide complexes [Al(OH)3] form rapidly, leading to excellent charge neutralization and sweeping precipitation. Operation below pH 5.0 risks leaving high residual soluble aluminum ions in the treated water.
Solid Aluminum Sulfate (flakes/granules) contains approximately 15% to 17% Al2O3 active ingredients, is easy to store long-term, but requires dedicated dissolution equipment. Liquid alum (about 8% Al2O3) is pre-dissolved, ready-to-use, reduces labor costs, and simplifies automated dosing systems, but is more expensive to ship due to water weight.
Yes. Wuxi BS manufactures high-purity, low-iron, and iron-free variants of alum that meet the chemical quality requirements of NSF/ANSI Standard 60. We monitor trace heavy metals (As, Cd, Pb, Cr, Hg) via batch ICP-MS analysis before releasing shipments.
Solid aluminum sulfate has an almost indefinite shelf life when stored in its original sealed 25kg or 1000kg packaging in a cool, dry warehouse. Liquid formulations are stable for approximately 1-2 years, provided they are stored in acid-resistant, temperature-controlled fiberglass or HDPE containers to prevent crystallization at lower temperatures.
We supply dry powder and flakes in 25kg multi-wall paper bags, 50kg bags, or 1,000kg/1,200kg industrial super sacks. Liquid shipments are delivered in ISO tanks, 1,000-liter IBC containers, or 200-liter PE drums, depending on customer site configurations.
Absolutely. Using a dual-chemical system is standard practice. Aluminum sulfate is first dosed as a primary coagulant to neutralize colloidal charges and form micro-flocs. A high-molecular-weight anionic polyacrylamide (APAM) is subsequently dosed downstream to bridge the micro-flocs into large, fast-settling macro-flocs, which dramatically improves clarification rates.
Cold water (especially below 4°C) significantly slows down the hydrolysis rate of aluminum ions, resulting in poor floc formation and slower settling. Under cold-water conditions, we recommend utilizing Polyaluminium Chloride (PAC) or adjusting the pH slightly upward to assist the hydrolysis process.
Alum is a simple aluminum salt that requires sufficient water alkalinity to hydrolyze properly. PAC (Polyaluminium Chloride) is a pre-hydrolyzed polymeric aluminum compound with higher charge density, wider pH tolerance, and superior performance in cold water, though raw alum is more cost-effective in standard municipal systems.
Explore our secondary high-performance organic and inorganic coagulant catalog, including high-charge organic polymers and composite ferric chlorides.
Keep up with technical updates, digitalized feeding installations, and industry innovations at Wuxi BS.
Sep 09, 2025
Wuxi BS Water Treatment Chemicals Co., Ltd. (Wuxi BS) continues to expand its global reach. We are establishing strategic bulk distribution centers to reduce lead times for aluminum sulfate and polymeric coagulants in key markets worldwide...
Read Full Article →
Aug 21, 2025
Officially launching digital intelligent dry chemical feeders to ensure precise dosing of solid aluminum sulfate flocculant and PAM under fluctuating water quality parameters.
Aug 21, 2025
Wuxi BS engineers participated in the conference, presenting new papers on low-sludge-volume composite aluminum salts and eco-friendly circular wastewater treatment technologies.
Get in touch with our applications engineers to calculate your chemical dosing rates, request laboratory test samples, or secure volume-based factory pricing.
Tel: +86 13584221461
Email: [email protected]
BS Water