HAOXiao-di,YANYing-ying,WUDao-qi,et al.History, Status and Future of Carrier Biofilm Technologies[J].China Water & Wastewater,2024,40(10):9-14.
History, Status and Future of Carrier Biofilm Technologies
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第10期
Page:
9-14
Column:
Date of publication:
2024-05-17
- Keywords:
- carrier biofilm; carrier micronization; carrier density; carrier material; single sludge systems; granular sludge
- Abstract:
- Driven by upgrading of wastewater treatment plants (WWTPs), the onsite upgrading technologies are very necessary because of limited spaces. Therefore, granular biofilm (aerobic granular sludge，AGS) have been developed with advantages. However, granular biofilm technologies have strict requirements on process design, and it is difficult to form particles and maintain them. Conversely, another form of biofilm, the carrier biofilm, seems to be simple in process design, easy to form membrane, and it is stable in biofilm fragmentation/detachment. Throughout the whole development process of carrier biofilm, if the oldest form of wastewater treatment would keep pace with the times and play the role of AGS, it will have new vitality. Carrier biofilm should be developed in the direction of micronization. But it is necessary to select and/or synthesize bio-stable materials with a densities slightly higher than that of water. Carrier micronization could help the growth of biofilm, and flocculent sludge can be eliminated by precipitation without further participation, forming a single sludge process with biofilm. It is easy for the biofilm to be suspended or circulated dynamically after the medium is micronized, which can form batch (SBR) or continuous simultaneous nitrogen and phosphorus removal process. In this way, carrier biofilm is actually equivalent to granular sludge, and it is even more convenient for the treatment than granular sludge in terms of biofilm formation and maintenance.
Last Update:
2024-05-17