Jiangsu Hengfeng Fine Chemical Co., Ltd.

A large slaughterhouse wastewater treatment plant in Paraná, Brazil, was experiencing poor sludge dewatering due to the high concentrations of proteins, fats, and organic matter in its biological sludge. The existing polymer resulted in high sludge moisture, long filtration cycles, and increasing disposal costs. After on-site evaluation and laboratory testing, Hengfeng recommended Cationic Polyacrylamide C9802 together with process optimization, significantly improving sludge dewatering efficiency and reducing operating costs. Site Overview Industry: Slaughterhouse & Meat Processing Location: Paraná, Brazil Treatment Capacity: Approximately 2,000 m³/day Sludge Production: 50–60 tons/day (wet sludge) Wastewater Characteristics · COD: 5,200–6,000 mg/L · BOD₅: 2,500–3,000 mg/L · Oil & Grease: 600–850 mg/L · High protein and biological sludge with strong water retention Initial Challenges Before optimization, the plant experienced: · Sludge cake moisture of 81–83% · Filter press cycles over 3.2 hours · Polymer dosage of 5.2–5.8 kg/t DS · Sticky sludge cakes and frequent filter cloth blockage · High sludge transportation and disposal costs Hengfeng Solution Hengfeng recommended Cationic Polyacrylamide C9802, featuring high molecular weight, optimized charge density, and excellent adsorption and bridging performance for biological sludge. To maximize performance, Hengfeng also optimized: · Polymer concentration increased to 0.15% · Aging time extended to 60 minutes · Polymer dosage reduced to 4.0–4.5 kg/t DS · Polymer injection point relocated closer to the filter press · Mixing intensity reduced to preserve floc strength Performance Results After continuous operation, the plant achieved remarkable improvements: Parameter Before After Sludge Cake Moisture 81–83% 72–74% Polymer Dosage 5.2–5.8 kg/t DS 4.0–4.5 kg/t DS Filter Press Cycle 3.2 h 2.2 h Filter Cloth Cleaning Frequent Reduced by 40% Polymer Consumption — Reduced by 18% The optimization lowered sludge disposal costs while improving filter press efficiency and ensuring stable long-term operation. Project Outcome By combining Hengfeng C9802 with process optimization, the slaughterhouse successfully achieved lower sludge moisture, shorter filtration cycles, reduced chemical consumption, and more reliable dewatering performance. Hengfeng Commitment At Jiangsu Hengfeng Fine Chemical Co., Ltd., we provide more than high-quality polyacrylamide products—we deliver complete wastewater treatment solutions through product selection, laboratory testing, on-site technical support, and process optimization. With Hengfeng C9802, slaughterhouse wastewater treatment plants can achieve higher dewatering efficiency, lower operating costs, and stable long-term performance.

The Application of Polyacrylamide in High-Salinity Wastewater Treatment‌   In high-salinity wastewater treatment, polyacrylamide (PAM) is primarily used as a ‌flocculant‌ during the pretreatment and sludge dewatering stages — not for directly removing salinity. The high-salt environment can significantly affect its performance, so both product selection and operational procedures require special attention.   Here are the key application points of PAM in High-salinity wastewater treatment: I. Core Function: Assisting Solid-Liquid Separation, Not Desalination The core function of PAM is to use adsorption bridging and charge neutralization to aggregate fine suspended particles, colloids, and biological sludge into larger flocs, which can then rapidly settle or be mechanically dewatered. Within the high-salinity wastewater treatment chain, PAM is mainly used in two stages: Pretreatment Stage‌: Before the wastewater enters membrane systems or evaporators, PAM is added to remove large particulate impurities and some organic matter, protecting downstream core equipment from clogging or fouling. Sludge Dewatering Stage‌: After biological or other treatment processes, a large amount of saline sludge is generated. Adding cationic PAM for sludge conditioning enables rapid mud-water separation and produces a denser sludge cake for easier disposal.   II. Product Selection: Nonionic is the Top Choice, Cationic Depends on Conditions Selecting the right type of PAM for high-salinity wastewater is critical — choosing the wrong type can render it completely ineffective.   Nonionic PAM: Strongest Salt Resistance, the Preferred Choice for Complex Water Quality.‌ High-salinity wastewater often contains large amounts of calcium and magnesium ions, as well as complex charged pollutants. Nonionic PAM has no charge on its molecular chains and primarily relies on its long polymer chains to entangle and capture surrounding suspended particles. This physical bridging action is unaffected by the shielding effect of high salt concentrations, making it highly adaptable and delivering stable settling performance in high-salinity, acidic, or complex water conditions found in industries such as metallurgy and chemical processing.   Cationic PAM: Specifically for Sludge Dewatering; Requires Overcoming Salt-Induced Charge Interference.‌ For dewatering organic sludge from biological treatment of high-salinity wastewater, cationic products are typically required. However, high salt concentrations can compress the polymer chains and interfere with the charge neutralization reaction between the PAM and sludge particles. Therefore, in such scenarios, specific cationic types with higher ionic degree and moderate molecular weight are often needed to counteract salt interference and achieve effective dewatering.   Anionic PAM: Narrower Applicability; Relies on Experimental Confirmation.‌ Anionic PAM carries a negative charge and is mainly used to treat positively charged suspended solids. However, in high-salt environments, its long chains are prone to curling due to the presence of salt ions, shortening the effective chain length and significantly reducing its bridging capability. Unless laboratory tests clearly demonstrate good performance, anionic PAM is generally not recommended for direct use in high-salinity wastewater.   III. Operation and Key Considerations Always Conduct Jar Tests‌: High-salinity wastewater quality varies greatly, and there is no one-size-fits-all product. It is essential to conduct beaker experiments using actual water samples in the laboratory to identify the most suitable PAM type, molecular weight, and dosage. This is a critical step to ensure effectiveness and avoid waste. Dissolution and Preparation‌: It is recommended to dissolve PAM using clean tap water or deionized water, preparing a dilute solution of 0.1%-0.2%. When dissolving, slowly and evenly add the powder under low-speed stirring (60-200 rpm) to prevent the formation of clumps or "fish-eyes," which can clog pumps and significantly reduce performance. Prepare Fresh and Use Promptly‌: PAM solutions have limited stability. Anionic and nonionic PAM solutions can generally be stored for up to one week, while cationic PAM solutions are recommended to be used within 24 hours. The more dilute the solution, the shorter the storage time. Monitor Water Quality Fluctuations‌: If the salinity, temperature, or pH of the high-salinity wastewater fluctuates significantly, the previously optimized dosing regimen may quickly become ineffective and must be adjusted in a timely manner.   In summary, PAM acts as a "cleanup agent" in high-salinity wastewater treatment. The core principle can be boiled down to one sentence: ‌Choose nonionic for pretreatment, cationic for sludge dewatering, and let laboratory jar tests have the final say in all selections.‌

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