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Implementation of a Bioreactor With Biofilm and Membranes For Removal of Nutrients Present in Wastewater

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At the moment, the application of the biological reactors with membranes (MBR) for the wastewater treatment is one of the technologies that has took a good place in the market, mainly because with this technology is possible to obtain effluents with very high quality allowing its reuse in different activities that demand this water resource. In Latin America, the application of the MBR in the domestic and industrial wastewater treatment is still low due to the high cost that represents the membranes that are used for the extraction of the permeate. That is why the search of materials for the elaboration of membranes with low cost and operation strategies that allow reducing the treatment costs is a necessity to increase the application of the MBR in developing countries. The main objective of this research was to design, construct and evaluate a batch reactor with moving bed and filtration membranes of low cost to carry out the elimination of the nutrients present in domestic wastewater. The research was made in a pilot reactor. The total volume was 29 L. The supporting materials for the fixation of biofilms were 500 cubes of polyester with a specific surface of 6 cm2 each one. The membranes module was constituted by 2 hydrophilic commercial membranes of polyurethane with a surface of 100 cm2 each one. The feeding was carried out with domestic wastewater. The reactor was operated in a discontinuous way with cycles of 8 hours (filling, anaerobic reaction, aerobic reaction, extraction of the permeate). The experimentation was made into three stages: (1) with activated sludge only, SBR, (2) SBR with the moving bed and activated sludge, (3) SBR with moving bed, activated sludge, and the module submerged with filtration membranes. The results show that the application of the bioreactor with moving bed and submerged membranes of low cost for the domestic wastewater treatment allow to carry out the elimination of nutrients present in the wastewaters in an efficient way. However, it is necessary to keep experimenting for making able to determine the optimum operation conditions, with which is possible to increase the elimination efficiencies of CDO and nitrogen present in the influents.
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Keywords: MBR; Wastewater; flat membranes; moving bed; nutrients

Document Type: Research Article

Publication date: 2010-01-01

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