期刊
WATER RESEARCH
卷 36, 期 7, 页码 1758-1766出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(01)00376-1
关键词
nitrate; autotrophic denitrification; membrane separation; membrane bioreactor
In this paper, a new method for removal of nitrate from groundwater, in which elemental sulfur-based denitrification (autotrophic denitrification) and membrane separation are combined, is proposed. By using a membrane, autotrophic denitrifiers, whose growth rate is considerably low, can be kept at a high concentration. The performance of the proposed process was examined through a long-term experiment in the laboratory using synthetic feed water. A rotating membrane disk module equipped with UF membrane (750.000Da) was used in this study. Complete removal of nitrate (25mg N/L) was achieved under the conditions of a biomass concentration of about 1000 mg protein/L and HRT of 160min. Dissolved oxygen concentration and sulfur/biomass ratio in the membrane chamber were found to be the key factors in maintenance of high-process performance, Deterioration in membrane permeability was insignificant. It was found that membrane filtration could be continued with a water flux of 0.5 m(3)/m(2)/day for about 100 days without any chemical membrane cleaning. The proposed process, however, caused a slight increase in assimilable organic carbon. Sulfide was not detected in the denitrified water. (C) 2002 Elsevier Science Ltd. All rights reserved.
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