关键词: 粉煤灰陶粒, 填料, 废水, 生物膜, 曝气

Abstract: The fly ash ceramisite was prepared with fly ash as the raw material and clay,dewatered sludge and desulfurized gypsum as auxiliary materials. Based on the strength testing,the optimal weight ratio of fly ash:dewatered sludge:clay:desulfurized gypsum is 85:10.5:0.5:4. Compared with commercial ceramic ceramisite and clay ceramisite,fly ash ceramisite has higher surface roughness,porosity,specific surface area and lower density,based on the test of porosity,hydrochloric acid soluble rate,specific surface area and SEM. The effect of fly ash ceramisite on wastewater treatment was compared with ceramic ceramisite and clay ceramisite,with the biological aerated filter (BAF) as the filler material. The result shows that:the removal rate of COD by fly ash ceramisite can reach 80%,the removal rate of ammonia even reaches 90%,and the removal rate of total phosphorus is above 80%. The effect of fly ash ceramisite on wastewater treatment is better than that of commercial ceramic ceramisite and clay ceramisite.

Key words: fly ash ceramisite, filler, wastewater, biofilm, aeration