期刊
DESALINATION
卷 349, 期 -, 页码 136-144出版社
ELSEVIER
DOI: 10.1016/j.desal.2014.06.030
关键词
Granular active carbon (GAC); Membrane bioreactor (MBR); Nanofiltration (NF); Reverse osmosis (RO); Old landfill leachate
资金
- National Natural Science Foundation of China [21236008, 21176226]
- Zhejiang Provincial Bureau of Science and Technology [2008C13014-2]
Anoxic/aerobic granular active carbon assisted membrane bioreactors (A/O-GAC-MBR) integrated with nanofiltration (NF)-reverse osmosis (RO) were used for leachate treatment of the Taizhou Municipal Landfill plant In order to investigate the effect of GAC on the performance of MBR, a hybrid MBR with GAC dosed and a conventional MBR were operated in parallel. Two pilot scale MBRs showed excellent and stable removal efficiency with average above 80% for chemical oxygen demand (COD) and ammonia-nitrogen (NH3-N). It was noticed that the amount of high-valence metal ions were removed more than low-valence ones. By comparison, the addition of GAC not only improved the removal of hazardous organic pollutants and heavy metals, but also enhanced bioflocculation and particle size of flocs, which greatly alleviated membrane fouling. NF and RO membranes were then used for advanced treatment of MBR effluents. NF membrane exhibited excellent color removal rate of 93.75% compared to 41.82% of A/O-MBR With the advantage of NF pretreatment, RO membrane held a steadier and higher flux as well as salt rejection than other cases reported. The final permeate from RO was proved to exceed related qualification for reutilization and can easily be recycled in industry. (C) 2014 Elsevier B.V. All rights reserved.
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