Clay Granule Filter Media

Clay granule filter media are made from clay, shale, or fly ash through high-temperature firing, resulting in spherical or porous irregular particles. As a water treatment filter media, it primarily removes suspended solids, colloids, and some dissolved pollutants from water through physical filtration, adsorption, and biofilm action.

Core Characteristics

Physical Structure: The internal microporous structure provides a large specific surface area, facilitating adsorption and microbial attachment; moderate density facilitates backwashing; the rough surface facilitates the retention of impurities; mechanical strength is measured by a low crushing and wear rate.

Chemical and Biological Characteristics: High chemical stability, resistant to acid and alkali corrosion; hydrophilic and porous surface, conducive to biofilm growth.

Hydraulic Characteristics: The multi-stage pore structure enhances pollutant retention capacity, and the high porosity results in slower head loss increase, extending the filtration cycle.

Typical Applications

Water Treatment: Used as a filter bed support layer or biological/deep treatment filter media to remove organic matter, ammonia nitrogen, etc.

Wastewater Treatment: Used as the core filter media in aerated biological filters (BAF) to simultaneously filter suspended solids and degrade pollutants; also used in constructed wetlands and deep treatment filters.

Other Applications: Used in water body ecological restoration, industrial circulating water filtration, soilless cultivation, and building materials, etc.

Selection Guide

Clarify Process Objectives: For primarily physical filtration, focus on particle size distribution and strength; for primarily biological treatment, prioritize varieties with high specific surface area and high porosity; modified ceramic granules can be considered for special adsorption needs.

Determine Physical Parameters: Select coarse particle size (high flow rate) or fine particle size (high precision) as needed, and control the uniformity coefficient; select appropriate bulk density and strength based on backwashing conditions.

Evaluate Chemical and Biological Performance: Verify chemical stability through hydrochloric acid solubility; evaluate biological film formation performance by referring to specific surface area, porosity data, and engineering case studies.

Comprehensive Verification: For critical projects, it is recommended to verify the treatment effect and operating parameters through pilot or medium-scale tests.

Summary

The key to selecting expanded clay aggregate filter media lies in matching its "porous adsorption properties" and "biocompatibility" with the specific requirements of the water treatment process. For physical filtration, focus on strength and particle size distribution; for biological treatment, focus on specific surface area and pore structure. For new or renovation projects, it is recommended to conduct necessary small-scale or pilot-scale filter column tests to verify the treatment effect, head loss characteristics, and backwashing parameters under specific water quality conditions, providing reliable data for engineering scale-up. We are a Chinese industrial ceramics manufacturer. For more information, please contact us via email at annayu@169chem.net or WhatsApp at +8618909016373.