Dosage Ratio of Polyacrylamide and Polyaluminum Chloride for Water Treatment

In water treatment, polyaluminum chloride and polyacrylamide are frequently used. What is the appropriate ratio for polyacrylamide to polyaluminum chloride dosage? (Hereinafter polyacrylamide is abbreviated as PAM, and polyaluminum chloride as PAC) This depends on the specific water quality conditions. Sometimes, excessively high concentrations necessitate higher PAM usage. Therefore, the safest approach is to conduct a small-scale pilot test first. As both are wastewater treatment chemicals, we typically select two types: PAC and PAM. PAC appears as yellow solid granules, while PAM is a white powdery substance. One acts as a flocculant, the other aids sedimentation. When used in combination, they achieve excellent purification results in wastewater treatment. However, determining the optimal dosing ratio requires time-consuming experimentation and calculation. We typically conduct these tests in beakers. PAM prices differ significantly from PAC prices. PAM tends to be more expensive, while PAC is considerably cheaper. PAC stands for polyaluminum chloride, while PAM is polyacrylamide. The former acts as a flocculant, and the latter as a coagulant aid. They are typically used in combination, with PAC added first followed by PAM. Sometimes acid or alkali may be required to adjust the pH. Both are primarily employed in coagulation sedimentation tanks—the physical-chemical treatment stage—and are commonly used in industrial wastewater treatment. For treatment processes following a biological-then-physical sequence, the dosage is approximately 0.1% PAC (national standard, 10% active content) and 1-3 ppm PAM. This translates to adding about 10 tons of PAC and 10-30 kg of PAM per 10,000 tons of water. For processes following a physical-then-biological sequence, these dosages should be doubled. Actual dosages vary based on water quality and require on-site fine-tuning. Polyacrylamide (PAM) in water treatment can serve as both a flocculant and a coagulant aid to enhance coagulation efficiency. Due to its cost and properties, it exhibits mild toxicity, necessitating strict dosage control when used in drinking water applications. It is typically employed under specific conditions (e.g., treating raw water with high turbidity and color). When polyaluminum chloride and polyacrylamide are used together, their addition sequence should be determined based on water quality characteristics, and dosage must be established through testing. In wastewater treatment, PAC is directly applied for chemical coagulation, effectively reducing color, turbidity, suspended solids (SS), and a proportion of chemical oxygen demand (COD) and biological oxygen demand (BOD). It also removes some nitrogen (N) and phosphorus (P) through adsorption and precipitation. Both chemicals perform distinct functions without significantly interfering with each other. The main products of flocculant manufacturer Xinhuan Water Treatment are: White polyaluminium chloride (food grade), drinking grade polyaluminium chloride, industrial grade polyaluminium chloride, anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polymerized iron and aluminium chloride, and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：86 19139972558 Email：Sunny@xhwtm.com Contact:Sunny