▎ 摘　　要

NOVELTY - Modified composite material comprises 5-40 wt.% flocculent sludge crosslinking agent, 20-65 wt.% in-situ flora regulator, and 5-35 wt.% activity promoter of autotrophic bacteria. USE - The modified composite material is useful in sewage biological treatment e.g. denitrification (all claimed). ADVANTAGE - The method uses modified composite material for fast agglomeration of sewage treatment related functional microorganism, which improves processing load of the biological tank, and suspension sludge precipitation performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for increasing the efficiency of sewage biological treatment using formic acid aqueous solution and/or acetic acid aqueous solution as solvent.