Poly Aluminium Chloride PAC (also known as Polyaluminium Chloride),
Polyacrylamide (PAM) and related products such as Polyferric Sulphate are all water purification flocculants. However, while polyaluminium chloride and polyacrylamide share similarities, they also differ. For instance, in certain water treatment applications,
PAC and
PAM serve distinct roles. Furthermore, the combined use of polyacrylamide and polyaluminium chloride in sewage treatment yields enhanced efficacy and performance. Differences between Polyaluminium Chloride and Polyacrylamide: 1. Chemical Properties: Based on chemical composition, polyacrylamide is an organic polymer; polyaluminium chloride is an inorganic polymer. 2. Appearance Differences: Regardless of whether polyacrylamide is anionic, cationic, or non-ionic, and irrespective of its solid or liquid form, it appears as a white dry powder or emulsion. Polyaluminium chloride, however, exhibits brown, light brown, or yellow hues depending on its aluminium content, with higher aluminium concentrations yielding lighter colours. As illustrated below: 3. Distinction in Mechanism of Action: As a water treatment chemical, polyaluminium chloride primarily employs electrostatic neutralisation to coagulate fine particulate matter in wastewater, compressing the diffusion layer to destabilise colloids. Polyacrylamide, conversely, leverages its adsorption bridging properties to form larger, more compact flocs, facilitating their sedimentation or flotation. 4. Differences in Addition Sequence: While both polyaluminium chloride and polyacrylamide are frequently employed within the same wastewater treatment process, they are added at distinct stages and must not be mixed during application. When wastewater turbidity is low or suspended solids/impurities are below 50μm in diameter, polyaluminium chloride should be added first, followed by polyacrylamide flocculant after approximately 30 seconds. Conversely, polyacrylamide should be added first, followed by polyaluminium chloride. 5. Shelf Life Differences: Under dry, ventilated, and sealed conditions, polyacrylamide powder has a shelf life of 2 years, while the emulsion has a shelf life of 6 months. Polyaluminium chloride has a shelf life of 1 year.
Polyacrylamide and Polyaluminium Chloride Mixture: Both polyacrylamide and
polyaluminium chloride are commonly used chemicals in wastewater treatment, with their combination being regarded within the industry as a ‘golden pairing’. However, when mixing polyacrylamide and polyaluminium chloride, care must be taken to observe the correct proportioning ratio during use. 1. Conduct laboratory analysis first. If the solid-liquid interface potential of suspended solids is negative (typically negative), a combined treatment using polyaluminium chloride and polyacrylamide may be employed. 2. Determine the dosage of polyaluminium chloride: Conduct dosage trials in the laboratory to establish the dosage curve and turbidity removal efficiency when PAC is used alone. 3. If the optimal dosage for PAC alone is denoted as A, the practical dosage should be set at 1/4 to 1/3 of A. 4. Laboratory determination of the polyaluminium chloride to polyacrylamide addition ratio: At one-third of the polyaluminium chloride dosage (A), determine the optimal polyacrylamide quantity required to bridge the flocculation effect of the polyaluminium chloride. 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：sales1@xhwtm.com Contact:Sunny
