Solutions

Application of Cationic Polymers in Municipal Sludge Dewatering - Thailand     A municipal wastewater treatment plant in Bangkok, Thailand, had been facing challenges in sludge dewatering. The plant's existing flocculants resulted in poor cake dryness and unstable dewatering performance, especially when the influent water quality fluctuated during the rainy season. This not only increased operating costs, but also brought difficulties to sludge treatment and disposal. Solution:   Hengfeng Chemical provided cationic polyacrylamide, which has a high charge density and optimized molecular weight, tailored to the characteristics of Thai municipal sludge. Our technical support team conducted a comprehensive on-site evaluation, including beaker tests and pilot tests, to optimize dosing parameters and ensure seamless integration with the plant's existing filter press system.   Results: Sludge dewatering efficiency increased by more than 35% Significantly improved sludge cake dryness, reducing transportation and landfill costs Reduce chemical consumption and improve cost-effectiveness Maintain stable performance under different wastewater qualities Make dewatering equipment run more smoothly, reduce blockage and maintenance requirements   The customer is very satisfied with the efficiency improvement and cost savings, and has adopted Hengfeng's cationic polyacrylamide as its long-term sludge treatment solution. This case shows that Hengfeng Chemical can provide targeted solutions for complex municipal challenges in Southeast Asia and other regions.

Polyacylamide Application of Polyacrylamide in Municipal Wastewater Treatment – Brazil One of the municipl wastewater treatment plant in São Paulo faced challenges with suspended solids, high turbidity, and inefficient sludge dewatering. Their previous flocculant required a high dosage and resulted in inconsistent treatment results, increasing operating costs. Solution:Hengfeng Chemical supplied a customized anionic polyacrylamide with a medium molecular weight and appropriate charge density for the local water conditions. Our technical team guided the on-site trial and optimized the dosage based on jar tests and flow rates. Results: Improved solid-liquid separation efficiency by over 30% Reduced sludge volume, cutting disposal costs Lower chemical consumption compared to the previous product Stable treatment performance, even during rainy season The client was highly satisfied with the results and continues to use Hengfeng PAM in their daily operations. This case highlights the adaptability and effectiveness of our polyacrylamide products in diverse municipal applications worldwide.

Cross - link emulsion can improve the treatment efficiency of municipal wastewater through several mechanisms, mainly by enhancing coagulation - flocculation, improving adsorption capacity, and optimizing membrane separation. The details are as follows: Enhancing coagulation - flocculation: Bridging effect: The cross - linked polymer chains in the cross - link emulsion can adsorb onto the surface of fine suspended particles in the wastewater. They act as bridges, connecting different particles together. This causes the fine particles to aggregate into larger flocs, which are easier to separate from the water. As a result, the sedimentation or filtration processes can more effectively remove these flocs, reducing the turbidity and suspended solids content in the wastewater. Charge neutralization: Many cross - link emulsions carry certain charges. They can interact with the charged particles in the wastewater, neutralizing their charges. This reduces the electrostatic repulsion between the particles, allowing them to come closer together and aggregate more easily. This charge - neutralizing effect helps to improve the coagulation process and promotes the formation of larger and denser flocs. Improving adsorption capacity: Large specific surface area: The cross - linked structure of the emulsion provides a large specific surface area. This allows more sites for the adsorption of pollutants. For example, organic pollutants, heavy metal ions, and other substances in the wastewater can be adsorbed onto the surface of the cross - link emulsion particles. The larger the specific surface area, the more pollutants can be adsorbed, thereby reducing the concentration of pollutants in the wastewater. Selective adsorption: Depending on the chemical composition and structure of the cross - link emulsion, it can have a certain degree of selectivity for different pollutants. Some cross - link emulsions can be designed to have specific functional groups that have a strong affinity for certain types of pollutants. This enables them to preferentially adsorb those pollutants, improving the efficiency of removing specific contaminants from the wastewater. Optimizing membrane separation: Antifouling properties: When used in membrane separation processes, cross - link emulsions can be coated on the membrane surface. This coating can reduce the adhesion of pollutants to the membrane. The cross - linked polymer chains form a protective layer that prevents the deposition of organic matter, bacteria, and other foulants on the membrane surface. As a result, the membrane's permeability and separation efficiency are maintained for a longer period, reducing the frequency of membrane cleaning and replacement. Improved membrane performance: The cross - link emulsion can also improve the hydrophilicity of the membrane. This makes it easier for water molecules to pass through the membrane, increasing the water flux. At the same time, it can enhance the mechanical strength of the membrane, making it more resistant to the pressure and shear forces in the filtration process. This helps to maintain the integrity and stability of the membrane, ensuring the high - efficiency operation of the membrane separation process.

At Jiangsu Hengfeng Fine Chemical Co., Ltd., we specialize in producing high-quality polyacrylamide (PAM),  can be applied in the mining,processing and tailing disposal process of mines such as coal, gold, silver, copper, iron, lead and zinc, aluminium, uranium, nickel, phosphorus, potassium, manganese and other minerals.Its main purpose is to improve the efficiency of the solid-liquid separation and recovery rate.Copper MiningThe pulp or tailings from the flotation cell need enter into thickening tank for further settlement. Flocculant can be fed for the promoting of subsidence and obtaining of overflow. The gained overflow can serve as circulating water.The remaining concentrated tailings will be pumped into the centrifugal for centrifuge dewatering,in which anionic polyarylamide as centrifugal additives is utilized. Anionic polyacrylamide flocculant is used to improve the efficiency of sedimentation and filtration. The concentrate of copper gained from cleaned mine or filter cake is 25% to 35%. It will be recovered through high temperature metallurgy.Coal WashingFlotation process is usually adopted to gain cleaned coal with high combustion value.Since the difference in proportion between coal particle and impurity in water,coal mine will float on the surface of the water while the impurity will percipitate at the bottom of the container.Cleaned coal is obtained after further process.In the above process,impurity can be removed and water can be recycled.Polyacrylamide can function as a flocculant to improve the seperation efficience of water and impurity.Nickel MiningIn the "wet" process,feeding PAM can get a quick water-mud separation effect when separate nickel from nickel mine.Lead and Zinc MiningMinerals can be oxidized to zinc oxide by calcination.Next,feed sulfuric acid to dissovle the oxide and filter.All the cleaned mines can be dissolved in acid with PH around 5 or 2.5.In lead and zinc filtering process, the use of anionic polyacrylamide flocculant can effectively promote the rapid subsidence of mineral and the clarification of the filtrate and improve the production efficiency of the process, reduce the loss of minerals.Gold and Silver MiningAfter the mine is grinded, anionic polyacrylamide flocculant can be fed to the thickener to subside the Solid content(%),and then the bottom substance can be filtered through several filters.Add polyacrylamide to the thickener before the filtration.