Hengfeng Fine Chemical’s Cationic PAM Empowers Printing and Dyeing Wastewater Treatment
Recently, customized cationic polyacrylamide (CPAM) products developed by Jiangsu Hengfeng Fine Chemical Co., Ltd. have been successfully applied in the wastewater treatment systems of multiple printing and dyeing enterprises. Targeting the industry pain points of printing and dyeing wastewater, such as high chroma, fluctuating water quality and difficult sludge dewatering, the products deliver efficient decolorization, solid-liquid separation and sludge reduction, offering reliable polymer flocculation solutions for the low-carbon green transformation of the textile printing and dyeing sector.
The textile printing and dyeing industry is a major water consumer. A large volume of wastewater is generated during desizing, dyeing, printing and finishing processes. The wastewater contains reactive dyes, sizing agents, surfactants, fiber suspended solids and other negatively charged colloidal pollutants. It features high chroma, fluctuating COD, poor biodegradability and variable water quality subject to production orders, making it a long-standing challenge for industrial wastewater treatment. Conventional reagent solutions often suffer from loose flocs, slow sedimentation, unstable decolorization, high sludge moisture content, excessive chemical dosage and high operating costs, bringing pressure on enterprises to maintain compliant environmental discharge.
With years of experience in R&D and on-site application of polyacrylamide, Hengfeng Fine Chemical has developed dedicated cationic PAM grades (including model C9802) tailored to the characteristics of printing and dyeing wastewater. By precisely adjusting cationic degree, molecular weight and molecular structure, the products rely on the dual effects of charge neutralization and adsorption bridging to rapidly neutralize negatively charged dye colloids and suspended particles in water. The pollutants agglomerate into dense, fast-settling large flocs, suitable for air flotation, sedimentation, advanced treatment of biochemical effluent and sludge dewatering. When used together with inorganic flocculants such as PAC, they can greatly improve decolorization performance, reduce effluent turbidity and COD, optimize sludge dewatering property, lower sludge moisture content and cut the volume of sludge for off-site disposal.
During on-site trials at multiple domestic printing and dyeing plants, Hengfeng’s technical team conducted lab jar tests and product selection based on water samples in advance, and customized dosing schemes according to customers’ production water quality and treatment processes (air flotation tanks, sedimentation tanks, plate-and-frame filter presses, belt filter presses). After commissioning, the supernatant in sedimentation tanks became noticeably clearer with stable chroma removal. The sludge flocs are compact and filter rapidly, producing dry filter cakes after pressure filtration. The chemical dosage is controllable, effectively reducing overall water treatment reagent costs and sludge disposal expenses for enterprises. It helps facilities cope steadily with online environmental monitoring and intermittent water quality shocks, achieving long-term stable compliant discharge.
“Printing and dyeing wastewater is complex in composition, and no single PAM grade fits all working conditions. We stick to the principle of one solution for one water sample,” said the technical director of Hengfeng Fine Chemical. The company provides free water sample testing, jar test selection, on-site technical guidance, and optimization of chemical dissolution and dosing processes. Both powder and emulsion cationic PAM are available to match the equipment conditions of different wastewater treatment stations.
As a professional domestic manufacturer focusing on polyacrylamide R&D, production and application, Jiangsu Hengfeng Fine Chemical has large-scale PAM production capacity. Its product portfolio covers cationic, anionic and nonionic polyacrylamide, widely used in wastewater treatment for printing and dyeing, municipal sewage, mining, coal washing, paper-making and other industries, with products sold to markets worldwide. Going forward, Hengfeng Fine Chemical will continue to deepen its presence in the segmented printing and dyeing wastewater treatment track, and iterate special flocculation formulations for difficult-to-treat printing and dyeing wastewater and high-salinity tail water. With stable and high-performance polymer flocculants plus localized technical services, the company will support the textile printing and dyeing industry in advancing wastewater recycling and cleaner production, and fuel the green and high-quality development of the industry.
