Abstract:

A novel bamboo fibre biofilm carrier was prepared. The carrier with a specific surface area of 5 393 m² ·m^-3 had a good hydrophilicity and could be soaked completely in 30 min. Biofilm formation on bamboo fibre carrier was investigated in treating low concentration domestic sewage. The results showed that the biofilm formed rapidly, abundant viscous yellowish-brown biofilm was observed on the surface of the carrier after 7 days, and the biofilm formation was completed in 12 days with a biofilm thickness of 3-5 mm. Biophase observation demonstrated the number of metazoan with sessile ciliates predominant was stable, and biofilm became mature. The biofilm on the carrier was good in tolerating hydraulic shearing impact and recovery. Further more, the removal efficiency of chemical oxygen demand and ammonia nitrogen by the biofilm were both more than 80%.

Key words: bamboo fibre, biofilm carrier, biofilm formation