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:

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.