Flotation electrocoagulation

F. Pouet, F. Persin, M. Rumeau, Intensive treatment by electrocoagulation - flotation - tangential flow microfiltration in areas of high seasonal population, Water Res. 25 (1992) 247-253. 

Pouet MF, Grasmick A. Urban wastewater treatment by electrocoagulation and flotation. Water Sci Technol 1995 31 275-283. 

Floes formed by EC are similar to chemical floe. But, EC floe tends to be much larger, contains less bound water, is acid resistant, and is more stable. In the chemical coagulation process, it is always followed by sedimentation and filtration. While in the electrocoagulation process, it can be followed by sedimentation or flotation. The gas bubbles produced during electrolysis can carry the pollutant to the top of the solution where it can be more easily concentrated, collected, and removed. 

The separation of the flocculated sludge formed by EC process can be accomplished by precipitation or flotation (Yavuz 2007 Szpyrkowicz 2007). However, preliminary experiment showed that the hydrogen gas produced at the aluminum cathode in an electrocoagulation cell was not so fine that could float only about 60% of the total solids. In our research group, a combinative bipolar EC-EF process was developed to treat laundry wastewater (Ge et al. 2004). 

Jiang, J.Q., Graham, N., Andre, C., Kelsall, G.H., Brandon, N. (2002). Laboratory study of electrocoagulation-flotation for water treatment. Water Res. 36, 4064 1078. 

Gao, P., Chen, X.M, Shen, F. and Chen, G. (2005) Removal of chromium (VI) from wastewater by combined electrocoagulation-electro flotation without a filter. Separ. Purif. Technol. 43, 117-123. 

Current economic and ecological analyses of the various processes available for recovery of minerals from seawater (evaporation, solvent extraction, sorption, ion exchange, flotation, fractional precipitation, distillation, electrolysis, electrodialysis, and electrocoagulation) favor ion exchange and sorption technology. 

M.M. Emamjomeh, M. Sivakumar, Review of pollutants removed by electrocoagulation and electro-coagulation/flotation processes, J. Environ. Mgmt. 90 (2009) 1863—1879. 

Another electrochemical method that has the potential to be an effective alternative to the various traditional techniques employed for the distillery and/or brewery effluent treatment is electrocoagulation. Electrocoagulation is based on the in situ formation of the coagulant as the sacrificial anode dissolves due to the applied current, while the simultaneous evolution of gases at the electrodes allows for organic pollutant ronoval by flotation (Khandegar Saroha, 2012). 

Sahl JW, Gary MO, Harris JK, Spear JR (2011) A comparative molecular analysis of water-filled limestone sinkholes in north-eastern Mexico. Environ Microbiol 13 226-240 Sbizzaro D, Bota GB, Borri RB, Teran FJC (2012) Electrocoagulation/flotation followed by fluidized bed anaerobic reactor applied to tannery effluent treatment. Desalin Water Treat 37 359-363... 

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