In the Mediterranean region, the availability of water many times does not meet the demand on existing resources in terms of quantity and quality owing to the scarce rainfall there. Many of the sources of natural water used for supplying the local population contain considerable amounts of Natural Organic Matter. The NOM found in the water can react with Chlorine to form Disinfection By-products such as trihalomethanes, haloacetic acids, etc. that deteriorate the water quality, rendering it unfit for human consumption because it could lead to adverse health effects [1] This investigation involved the study of THM and HAA formation potential by nanofiltration. Natural waters from two different sources in Alicante province were analyzed. The study was carried out using three commercial NF membranes denoted by NF-270, NF-90 and Desal-HL-51. The influence of conductivity was also analyzed. Sentana, I.; Rodríguez ,M.; Sentana, E.; C. M'Birek and Prats, D.

Micellar-enhanced ultrafiltration (MEUF) is an effective separation technique for removing metal ions from aqueous environments. The critical micellar concentration (CMC) of two anionic surfactants, sodium dodecyl sulfate (SDS) and linear alkylbenzene sulfonate (LAS), was determined by means of conductometry. The effects of pH, conductivity, and surfactant concentration on the permeate flow, retention of surfactants and nickel by MEUF, was studied. Results showed that for surfactant concentrations beyond the CMC, Ni(II) retention with SDS was slightly higher than with LAS (S/M=45: Ni(II) retention was 70% and 55% for SDS and LAS, respectively). LAS surfactant was always retained in higher quantities than SDS. An increase in conductivity produced large reduction in Ni(II) retention and slightly increased surfactant retention. pH values between 4 and 8 did not affect nickel retention but enhanced the SDS and LAS surfactant retentions.

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