In waste gas treatment, especially in the treatment of industrial waste gas containing VOCs (such as printing, painting, and chemical industry), diatomaceous earth powder can effectively adsorb harmful substances. The porous structure of diatomite powder has a large number of adsorption sites, which can capture VOC molecules through van der Waals forces and electrostatic attraction. After modifying the surface of diatomaceous earth powder (such as loading activated carbon, titanium dioxide, etc.), its adsorption capacity for VOCs can be further improved. Taking the painting workshop of an automobile manufacturing plant as an example, the waste gas contains a large amount of benzene, toluene, and xylene. After passing the waste gas through a filter bed filled with modified diatomaceous earth powder, the removal rate of benzene, toluene, and xylene can reach more than 90%, and the concentration of VOCs in the treated waste gas is lower than the national emission standard (≤80 mg/m³). Compared with traditional activated carbon adsorption, diatomaceous earth powder has the advantages of low cost, long service life (adsorption saturation time is 2-3 times that of activated carbon), and easy regeneration (can be regenerated by heating at 300-400°C, and the adsorption capacity can be restored to more than 85% after regeneration).​

In the treatment of odorous waste gas (such as waste treatment plants, sewage treatment plants, and livestock farms), diatomaceous earth powder can also play a good role in deodorization. Odorous substances mainly include ammonia, hydrogen sulfide, and mercaptans. The porous structure of diatomite powder can adsorb these odorous molecules, and the alkaline or acidic functional groups on its surface (after modification) can react with odorous substances to decompose them into harmless substances. A waste treatment plant in a coastal city used a deodorization system based on diatomaceous earth powder. After installation, the odor concentration around the plant was reduced from 5000 OU/m³ to less than 200 OU/m³, which was far lower than the national standard (≤400 OU/m³), and the complaints from nearby residents were reduced by 90%. At the same time, the diatomaceous earth powder used in the deodorization system can be reused after regeneration, reducing the amount of solid waste generated.​

In wastewater treatment, high adsorption diatomaceous earth powder can be used to treat industrial wastewater containing organic pollutants (such as printing and dyeing wastewater, chemical wastewater). Printing and dyeing wastewater contains a large number of dyes and auxiliaries, which have high chroma and COD, and are difficult to degrade. Adding 2-5% diatomaceous earth powder to the wastewater can adsorb the dyes and organic matter in the water. Tests show that the chroma removal rate of printing and dyeing wastewater can reach more than 95%, and the COD removal rate can reach 60-80%. Compared with traditional coagulants (such as aluminum sulfate), diatomaceous earth powder has no secondary pollution (no aluminum ion residue), and the sludge generated after treatment is easy to dehydrate and can be used as a building material additive after harmless treatment. A printing and dyeing factory in Zhejiang used diatomaceous earth powder to treat its wastewater. After treatment, the wastewater can be recycled for production (after further advanced treatment), reducing the factory’s water consumption by 30% and saving a lot of water costs.​

Our high adsorption diatomaceous earth powder for environmental protection has a variety of product forms, including powder, granular, and extruded. The powder form (100-800 mesh) is suitable for wastewater treatment and waste gas adsorption towers; the granular form (1-5 mm) is suitable for fixed-bed adsorption systems in waste gas treatment; the extruded form (5-10 mm) is suitable for large-scale waste gas treatment projects with high air volume. The main technical indicators of our products are: specific surface area ≥200 m²/g, pore volume ≥0.8 cm³/g, adsorption capacity for methylene blue ≥15 mL/0.1g, and moisture content ≤3%. We can also provide modified diatomaceous earth powder products according to customers’ specific treatment objects, such as activated carbon-loaded diatomite powder (for VOCs adsorption), titanium dioxide-loaded diatomite powder (for photocatalytic degradation of organic pollutants), and alkaline diatomite powder (for hydrogen sulfide adsorption).​

In the production process, we adopt advanced activation technology to enhance the adsorption capacity of diatomaceous earth powder. The activation process includes acid activation (using dilute sulfuric acid to etch the surface of diatomite particles, increasing the number of pores) and thermal activation (calcining at high temperature to remove organic impurities in the pores and expand the pore size). The activated diatomaceous earth powder has a specific surface area increased by 30-50% compared with the original ore, and the adsorption capacity is significantly improved. Each batch of products will undergo adsorption capacity testing (using methylene blue solution as the adsorbate) and pore structure testing (using a specific surface area analyzer), ensuring that the product performance meets the requirements.​