A coagulation–MF system for water treatment using ceramic membranes

by Krystyna Konieczny, Mariola Rajca and Michał Bodzek
Desalination 198 (2006) 100-109

Abstract

The results of studies are presented on the treatment of natural waters with a high content of organic compounds. The research involved unit processes of coagulation, microfiltration, and the hybrid process coagulation– sedimentation–microfiltration. In the membrane filtration process 19-channnel ceramic membranes manufactured by Orelis (France) were used. Simulated water containing humic acids in an amount of 20 and 30 mg/l was also used. Four coagulants were tested for which optimal process parameters were determined experimentally. The effectiveness of coagulation and microfiltration and that of the hybrid system coagulation–membrane filtration was tested, based on measurements of the membrane yield (permeate flux) and physicochemical analysis of raw water and permeates. The application of the hybrid system combining coagulation and microfiltration offers better removal of organic pollution (100% for TOC).

Authors

Mariola Rajca (2), Krystyna Konieczny (10), Michał Bodzek (3)

Tags

Microfiltration (77)
... are presented on the treatment of natural waters with a high content of organic compounds. The research involved unit processes of coagulation, microfiltration, and the hybrid process coagulation– sedimentation–microfiltration. In the membrane filtration process 19-channnel ceramic membrane ...

Water treatment (26)
The results of studies are presented on the treatment of natural waters with a high content of organic compounds. The research involved unit processes of coagulation, microfiltration, and the hybrid process coagulation ...

Ceramic membranes (12)
... microfiltration, and the hybrid process coagulation– sedimentation–microfiltration. In the membrane filtration process 19-channnel ceramic membranes manufactured by Orelis (France) were used. Simulated water containing humic acids in an amount of 20 and 30 mg/l was also used. Fou ...

Coagulation ()
... of studies are presented on the treatment of natural waters with a high content of organic compounds. The research involved unit processes of coagulation, microfiltration, and the hybrid process coagulation– sedimentation–microfiltration. In the membrane filtration process 19-channnel cerami ...

Conclusion

The following conclusions can be drawn: C Coagulation applied as a unit process does not ensure a full reduction of organic compounds, and therefore it cannot be applied as a single unit process in the treatment of water with high a content of humic acids. C MF eliminates organic compounds from water by 100%, yet the blocking process of membranes with said compounds may considerably reduce their life. C In order to ensure a constant and high yield of the membranes and to prolong their life (prevention of fouling and concentration polarization), filtration with the hybrid coagulation–MF system should be applied, which can be particularly relevant when the amount of organic compounds in water is higher than the average. C by combining coagulation and MF, the parameters of concentration of organic compounds and turbidity are reduced to required levels. C A ceramic membrane with smaller pores (0.1 µm) removes ferric ions remaining after the coagulation process to the standard amount.


Source: http://www.desline.com/articoli/7367.pdf


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