1、 Raw materials:
Walnut shell filter material is a water treatment filter material made from high-quality walnut shells, which are crushed, polished, steamed, washed, and treated with drugs, and then screened and processed twice. Walnut shell filter material has the advantages of high hardness, wear resistance, good compression resistance, pressure resistance of 23.4kgf, stable chemical properties, no dissolution in acid and alkali, strong adsorption and interception ability, adsorption rate of 27-50%, good hydrophilicity, and oil immersion resistance.
2、 Main technical indicators:

3、 Features:
Walnut shell filter material, due to its inherent hardness, ideal specific gravity, porosity, and versatility, and special physical and chemical treatment (removing pigments, fats, oils, and electrochemical ions), has strong oil removal performance, solid particle removal, and easy backwashing in water treatment. Walnut shell filter material has been widely used in oilfield oily wastewater treatment, industrial wastewater treatment, and civil water treatment. It is a new generation of filter material that replaces quartz sand filter material, improves water quality, and significantly reduces water treatment costs. According to tests conducted by Beijing Forestry University, Shandong Academy of Sciences Testing Center, and Jiangsu Environmental Protection Research Institute, walnut shell particles with a compressive strength of 1.25-1.60mm have an average compressive limit of 0.2295KN (23.40kgf). The average compressive limit of walnut shell particles with a particle size of 0.80-1.00mm is 0.165KN (16.84kgf). The chemical properties are stable, free of toxic substances, and the solubility in acid, alkali, and water is very small. The loss rate of walnut shells in hydrochloric acid solution is 4.99%, and the loss rate in sodium hydroxide solution is 3.8%, which will not cause water quality deterioration.