Basic Definition of Ceramsite Filter Media
Briefly introduce the basic definition of ceramsite filter media.
Basic Definition of Ceramsite Filter Media
Ceramsite filter media is a spherical or irregularly shaped porous material made primarily from clay, shale, and fly ash through granulation and high-temperature calcination. It features a honeycomb-like microporous structure, a rough surface, and possesses certain mechanical strength and chemical stability, making it widely used in water treatment and filtration.
Basic Concepts
Ceramicsite filter media is a type of artificial lightweight aggregate, named for its porous structure, light weight, and large specific surface area. The main raw materials include clay, shale, fly ash, and coal gangue, which are processed through batching, pelletizing, and high-temperature calcination (1100-1300℃). The product is round or elliptical, with a particle size typically ranging from 0.5-25 mm.
Structural Characteristics
The typical characteristic of ceramsite filter media is its uniform microporous structure, both internally and externally:
Rough surface: Increases the ability to retain suspended solids
High internal porosity: Porosity reaches 30%-45%, large specific surface area, which is conducive to microbial attachment
Spherical particles: High packing porosity, low water flow resistance
Lightweight: Density is typically 0.8-1.2 g/cm³ (apparent density)
Performance Indicators
Specifications | Typical Range | Description |
Particle Size | 0.5-25mm | Selected according to application |
Apparent Density | 0.8-1.2 g/cm³ | Lighter than water or slightly heavier than water |
Bulk Density | 0.5-0.9 g/cm³ | |
Porosity | 30%-45% | Internal micropores |
Specific Surface Area | 1-5 m²/g | |
Abrasion Rate | <2% | High-strength ceramsite |
Breakage Rate | <3% | |
Acid Solubility | <2% | Chemical Stability |
Main Applications
The core applications of ceramsite filter media are based on its porous structure and surface properties:
Water Treatment Filtration: Used in rapid sand filters in waterworks and wastewater treatment plants to intercept suspended solids in water.
Biofilter Carrier: Used as packing material in biologically aerated filters (BAFs), providing an attachment surface for microorganisms.
Constructed Wetlands: Used as a substrate material to adsorb pollutants and support plant growth.
Reverse Osmosis Pretreatment: Used as pre-filtration in RO systems.
Groundwater Iron and Manganese Removal: Used as contact oxidation filter media.
Summary
Ceramicsite filter media is a type of porous granular material made from clay, shale, and other raw materials through high-temperature calcination. Its core characteristics are lightweight, porous, large specific surface area, and rough surface. These properties give it unique advantages in water treatment filtration and biofilter carriers, enabling it to achieve the dual functions of interception and biodegradation. It is an important supplement and upgraded alternative to traditional filter media such as quartz sand.