Abstract: A surface modification method，chemical oxidation-surface covering with iron ion，was used to modify the polyurethane (PU) foam plastics bio-carrier. And surface properties of the bio-carrier，speed of biofilm formation，quantity of biological film and performance of treating wastewater were investigated before and after modification. The results showed that the ratio of the hydrophobic C—C，C—H bond on the surface of the modified bio-carrier was reduced by 15.81%，and the ratio of the hydrophilic C—O bond on the surface of the modified bio-carrier has increased by 16.17%. The dynamic contact angle of water against the bio-carrier surface was decreased by 10.46°. The surface roughness and hydrophilicity of the bio-carrier were enhanced. Comparing modified bio-carrier with the original bio-carrier，the quantity of biofilm increased by 60%，and the average growth rate of biological film increased by 50%. But the TTC-DHA of modified bio-carrier hardly increased. At the stage of biofilm formation，the performance of COD and ammonia removal of the modified bio-carrier was better than the original bio-carrier. After completion of biofilm formation，the removal efficiency of COD was almost the same，but the removal efficiency of ammonia increased by 10%.

Key words: polyurethane bio-carrier, modification, biofilm, wastewater treatment

摘要： 采用化学氧化-铁离子覆盖改性方法对普通聚氨酯泡沫塑料填料进行改性，研究改性前后填料的表面特性、挂膜速度、生物膜量以及废水处理等性能。结果表明，改性填料表面的疏水性基团C—C、C—H比例下降了15.81%，亲水性基团C—O比例增加了16.17%，填料表面与蒸馏水的动态接触角减少了10.46°，其表面粗糙度以及亲水性提高。与未改性填料相比，改性填料生物膜量提高60%，生物膜平均每天生长量提高50%，但其生物膜脱氢酶活性并未明显提高。挂膜初期改性填料的COD和氨氮去除效果明显占优，挂膜完成后，改性填料对氨氮去除率比未改性填料高10%。

关键词: 聚氨酯填料, 改性, 生物膜, 废水处理