Anthracite filter media is a core material for water treatment, widely applied in drinking water, industrial wastewater, and circulating water processes. Its high porosity, large specific surface area, and good chemical stability enable effective interception of suspended solids and colloids, but filtration performance is affected by multiple key factors.
Raw material quality is the foundation. High-quality anthracite, with carbon content ≥80%, has fewer impurities and strong mechanical strength, avoiding dissolution, pulverization, and secondary pollution. Sufficient wear resistance prevents breakage during filtration and backwashing, reducing media loss.
Particle size gradation and uniformity are crucial. Oversized particles cause impurity penetration, while undersized ones lead to clogging and high flow resistance. Poor uniformity wastes deep filter capacity, as fine and coarse particles stratify unfavorably after backwashing.
Filter bed thickness and loading uniformity matter too. Insufficient thickness causes impurity penetration, while excessive thickness increases energy consumption. Uneven loading leads to water short-circuiting, reducing filtration effectiveness.
Proper operating parameters and backwashing are essential. Excessive filtration rate results in incomplete interception, while overly low rates reduce efficiency. Standard backwashing (12–16 L/(m²·s), 5–8 minutes, 24–72-hour cycle) restores capacity; improper intensity or time causes clogging or media loss.
Water temperature, pH, and media matching also influence performance. Neutral/weak alkaline conditions and stable temperature are optimal. Matching with quartz sand and magnetite enhances overall efficiency, while poor matching causes layer mixing.
In summary, selecting high-quality anthracite, optimizing particle size and bed design, standardizing operation and backwashing, and ensuring proper media matching are key to maximizing filtration efficiency and reducing operating costs.
