▎ 摘　　要

NOVELTY - Biological filter material includes premixing core material and autoclaved concrete premix. The pre-mixing core material is composed of 30-50 pts. wt. calcium-based bentonite, 40-60 pts. wt. lanthanum chloride, oxidized, 1-5 pts. wt. oxidized graphene, 3-8 pts. wt. wood cellulose, 5-12 pts. wt. starch xanthate, 5-12 pts. wt. polyvinyl alcohol, 0.5- 1 pts. wt. borax. The autoclaved concrete premix is composed of 40-60 pts. wt. cement, 20-32 pts. wt. fly ash, 15 -25 pts. wt. lime, 3-6 pts. wt. gypsum powder, and 0.5-1 pts. wt. pore-forming agent. USE - The biological filter material is useful for slowly releasing heavy metal/lock phosphorus, and in the treatment of wastewater discharged from the biochemical treatment of sewage plants (claimed), and used as the supporting material of the slow-release core material. ADVANTAGE - The biological filter material: improves the slow-release effect; and has a strong removal ability for other heavy metal ions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing biological filter material.