Coking plants play a vital role in the deep processing of coal, producing essential products such as coke, coke oven gas, tar, and crude benzene. However, the production process inevitably generates large volumes of wastewater with highly complex compositions. This type of wastewater contains suspended solids, oil droplets, tar particles, phenols, cyanides, ammonia nitrogen, sulfides, and other contaminants. It is characterized by deep color, pungent odor, high COD and BOD, strong toxicity, and poor biodegradability. As one of the most difficult types of industrial wastewater to treat, untreated coking wastewater can cause long-term environmental damage to nearby water bodies, soil, and ecosystems, while also exposing enterprises to stricter environmental compliance risks.

Against this backdrop, polyacrylamide (PAM) has become an indispensable chemical in the treatment of coking wastewater. PAM is a high-molecular-weight polymer with active functional groups on its molecular chain, which can interact with pollutants in water. Through adsorption, bridging, and charge neutralization, PAM aggregates tiny suspended solids and colloids into larger, denser flocs that settle quickly, leading to effective water clarification. Compared with traditional inorganic coagulants, PAM requires lower dosages, provides stronger effects, and performs stably under complex water conditions, making it a key auxiliary agent in coking wastewater treatment processes.

At different treatment stages, PAM delivers significant benefits. During the pretreatment stage, it helps to quickly remove suspended solids and oil droplets, lowering turbidity and reducing the organic load for subsequent biological processes. In biological treatment systems, PAM improves sludge flocculation and sedimentation, ensuring stable microbial activity and smooth operation of the system. At the advanced treatment stage, PAM further reduces COD, BOD, and color, enhancing effluent clarity and stability to meet strict discharge standards. For sludge dewatering, cationic PAM is particularly effective, improving water separation efficiency, producing denser sludge cakes with lower moisture content, and significantly reducing transportation and disposal costs.

Different types of PAM are suitable for various scenarios in coking wastewater treatment. Anionic PAM is highly effective in removing suspended solids and improving clarity, cationic PAM is ideal for treating negatively charged organic pollutants and high-moisture sludge, while nonionic PAM offers better stability under fluctuating pH conditions and complex water qualities. By selecting the right ionic type, molecular weight, and dosage strategy, and combining PAM with inorganic coagulants such as PAC or iron salts, enterprises can achieve optimized wastewater treatment performance.

With increasingly stringent environmental regulations, traditional physicochemical and biological treatment methods alone are no longer sufficient to ensure stable compliance. The adoption of efficient treatment chemicals like PAM has become an important step in helping coking enterprises upgrade their wastewater treatment systems. Beyond improving efficiency and effluent quality, PAM also reduces overall operating costs and enhances environmental compliance, supporting both economic and sustainable development goals.

As a specialized manufacturer in the water treatment field, Jiangsu Hengfeng Fine Chemical has long been dedicated to the research, production, and application of polyacrylamide. The company offers a full range of cationic, anionic, and nonionic PAM products, which have been successfully applied in multiple coking plant projects. With stable quality, fast solubility, and excellent flocculation performance, Hengfeng’s PAM not only simplifies the challenges of coking wastewater treatment but also delivers outstanding results in sludge reduction, operational cost savings, and environmental compliance.

It can be said that PAM is no longer just a treatment additive in the coking industry, but rather a strategic tool that supports enterprises in their green transformation. Looking ahead, as the industry places greater emphasis on clean production and resource recycling, Jiangsu Hengfeng Fine Chemical will continue to provide efficient, eco-friendly products and technical solutions, empowering the coking industry to achieve cleaner, safer, and more sustainable development.