How does water treatment polyaluminium chloride maintain high performance in low-temperature source water treatment?
Publish Time: 2025-10-02
In water treatment projects, fluctuations in source water temperature, especially low temperatures in winter, often pose a significant challenge to coagulation. Low temperatures reduce the Brownian motion intensity of colloidal particles in water, slowing the hydrolysis reaction rate of the reagent, resulting in slow floc formation, loose structures, and poor settling performance, severely impacting the efficiency of subsequent sedimentation and filtration processes. However, as a highly efficient inorganic polymer flocculant, water treatment polyaluminium chloride, thanks to its unique chemical structure and excellent physical and chemical properties, maintains excellent treatment performance even in low-temperature source water, becoming a key factor in the stable operation of water plants in cold regions.1. Molecular Structure Advantages: Shortening the Reaction Path and Improving Reaction SpeedThe core advantage of water treatment polyaluminium chloride lies in its high content of polynuclear hydroxyl complexes. These pre-polymerized active ingredients, upon addition to water, bypass the slow hydrolysis process required by traditional aluminum salts and directly exert their charge neutralization effect, rapidly compressing the double layer of colloidal particles in water and destabilizing their aggregation. This "pre-hydrolysis" feature significantly shortens reaction time. Even at low temperatures, when the thermal motion of water molecules is weakened and the hydrolysis reaction kinetics are insufficient, PAC can still rapidly initiate the coagulation process, avoiding reagent waste and treatment delays caused by slow reactions.2. High Purity and Low Impurities: Ensuring Stability at Low TemperaturesHigh-quality water treatment polyaluminium chloride products feature high purity and low heavy metal content, which is particularly important for low-temperature treatment. Impurity ions are more likely to react with reagents at low temperatures, forming insoluble precipitates or interfering with the flocculation process. High-purity PAC, however, has fewer impurities, a clear reaction pathway, and stable efficacy, making it less susceptible to fluctuations in water quality. Furthermore, its non-toxic and harmless properties ensure the safety of treated effluent, meeting drinking water hygiene standards. It is particularly suitable for use in cold weather, where water quality requirements are more stringent.3. Excellent Flocculation: Forms Dense Flocs, Improving Settling EfficiencyUnder low-temperature conditions, the flocs formed by traditional flocculants are often small, loose, and low-density, resulting in slow settling, reduced sedimentation tank efficiency, and even turbid effluent. Water treatment polyaluminium chloride, with its high charge density and long-chain structure, not only effectively neutralizes colloidal charges but also connects multiple destabilized particles into large, dense flocs through adsorption and bridging. These flocs, with their compact structure and high specific gravity, maintain excellent settling performance in sedimentation tanks operating at low temperatures and low flow rates, significantly reducing effluent turbidity and improving treatment efficiency.4. Excellent Solubility and Adaptability: Ensuring Rapid Dispersion of the AgentWater treatment polyaluminium chloride has excellent solubility, dissolving quickly and evenly even in low-temperature water, eliminating "fish eyes" and undissolved particles and ensuring thorough mixing of the agent with the source water within a short period of time. This characteristic is particularly critical for low-temperature water treatment, where the increased viscosity of water makes mixing more challenging. PAC's rapid dissolution ensures optimal coagulation conditions, improving the overall system's responsiveness and stability.5. Wide Applicability Supports Complex Water TreatmentPAC is suitable not only for low-temperature water but also for source water of various temperature ranges. Its wide pH adaptability allows it to perform effectively across diverse water quality conditions. For complex water sources characterized by low-temperature high turbidity, low-temperature low turbidity, or high organic matter content, PAC can be flexibly adapted to meet diverse challenges by adjusting dosage and combining it with coagulants to ensure effluent quality meets standards.6. Proven Reliability in Multiple IndustriesWater treatment: Polyaluminium chloride is widely used not only in municipal water supply and wastewater treatment, but also in industries such as papermaking, textile printing and dyeing, mining, and oil extraction, demonstrating excellent flocculation performance. PAC's low-temperature efficiency has been proven in numerous engineering cases, particularly in industrial circulating water treatment during winter in northern China, making it a crucial agent for ensuring stable system operation.In low-temperature source water treatment, water treatment polyaluminium chloride effectively overcomes the coagulation challenges associated with low temperatures thanks to its pre-polymerized structure, high reaction speed, excellent flocculation properties, and good solubility. Its high purity, low impurity content, and non-toxicity further ensure the safety and stability of the treatment process. With the continuous advancement of water treatment technology, water treatment polyaluminium chloride, as a highly adaptable and reliable high-efficiency flocculant, will continue to play a key role in addressing extreme climates and complex water quality challenges, providing solid support for the safe use of water resources.
