Dynamic filtration--influence of different precipitation agents on the filtration performance using an inside-out filtration module

作者：Loderer Christian^*; Gahleitner Bernhard; Woerle Anna; Fuchs Werner

来源：Desalination and Water Treatment, 2015, 53(4): 940-950.

DOI：10.1080/19443994.2013.846235

• Precipitant agents
• Inside-out module configuration
• Different cross-flow velocities
• Dynamic filtration
• Long-term performance

Recently, a new type of wastewater treatment system became the focus of scientific research: the dynamic membrane bioreactor. It is a modification of the membrane bioreactor (MBR), with the main difference that a mesh filter is used instead of the membrane for sludge separation. The effluent is not of the same excellent quality as with MBRs due to the much larger size of the mesh openings. Nevertheless, the new system has all the other advantages of MBRs, including substitution of the settling tank as well as elevated sludge concentration resulting in decreased basin volumes. However, so far little experience on performance under practical conditions is available. In this study, for the first time, results concerning the impact of different precipitation agents on filtration performance are reported. Correlation between precipitation agents, the mesh size and the operational conditions was investigated. For this purpose, dead end and cross-flow filtration tests were carried out using real wastewater samples. According to the experience, flocculation strongly interferes with the dynamic filtration process. In contrast to initial expectations, lower filtrate quality compared with the untreated reference was observed. Despite on the observed impact of flocculation on the filtration performance, dependent on the type of flocculating agent, the dynamic filtration system can be efficiently used for phosphorus removal applications.

• 出版日期2015-1-23