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The sustainable management of water resources often requires the identification of wastewater as a valued
source of water. Although the benefits of wastewater reuse and reclamation have increased significantly
in Europe because of the advances in effectiveness of wastewater treatment and disinfection technologies
there is currently no legislation nor guidelines regarding reuse. It is well known that there is a
great variation of wastewater reuse quality criteria applied, mainly related to significant differences in
socioeconomic conditions, environmental policies, available water resources. In this work the parameters
that affect the wastewater reuse criteria in Greece are evaluated, concerning among others reuse
priorities, available treatment plants and effluent characteristics and recommendations are made for
developing future guidelines or regulations for Greece in relation to reuse practices (agricultural, urban,
etc). The intention is not to propose an unquestionable and rigid set of standards, but to present them
on the basis of the rationale developed, in order to form a basis for further consultation, involving all the
interested parties. The recommendations are presented in relation to the different types of reuse, with
appropriate specific standards and recommended treatment systems wherever applicable.

This study was conducted to assess the removal efficiency of Di-n-butyl phthalate (DnBP) from aqueous
medium using the photo-Fenton process. The Fenton's reagent that consists of a mixture of hydrogen peroxide
(H2O) and ferrous ions (Fe2+) was used to generate the hydroxyl radical (OH0) that attacks the target
contaminant and degrade it. An ultraviolet (UV) source was used to provide the radiation needed in
the photo-Fenton method (i.e. UV/H2O2/Fe2+). The results demonstrated that photo-Fenton process was
more effective and faster than Fenton's reagent in removing DnBP and that photolysis by UV irradiation
was the dominant mechanism in degrading the compound. The results also showed that enhancing the
removal via UV irradiation was achieved by increasing either the temperature or the H2O2 concentration.

The effects of effluent from Thessaloniki, the second most populated Greek city, reclaimed either by
activated sludge or by stabilization ponds, were studied on field-grown corn. The experimental layout
was that of a split- plot design with six replications, three water qualities and two irrigation methods.
Potable water was used as the control. No significant differences in corn yield have been observed
among the three water-quality treatments. However, significant differences have been observed in corn
yield between the irrigation methods. Furrow irrigation has produced about 10% more corn yield than
trickle irrigation. There is a potential risk of facing problems related to soil salinity and alkalinity if no
consideration for soil reclamation is taken into account. The trace element concentration in the soil and
plant was low. The chlorinated effluent was free of pathogens, while the presence of pathogens was
detected in the non-chlorinated effluent reclaimed by the stabilization ponds.

In this study, ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) stereo
imagery was analysed in combination with Global Positioning System (GPS) data and field observations,
using Geographical Information Systems (GIS) techniques to examine the potential of satellite
remote sensing to support watershed management. Terrain elevation data were derived for the region
of Heraklion, Crete. The accuracy of the ASTER derived DEM (Digital Elevation Model), was better
than 20 meters (planimetric) and better than 15 meters (elevation). Supervised classification techniques
were applied for land cover production using ASTER multi-spectral imagery and filed observations
at predefined application sites. The determination of training areas required in the supervised
classification scheme was based on these observations. Finally, GIS methods were applied to estimate
watershed characterization parameters for the study area offering the advantages of spatial data handling
capabilities and automatic extraction of thematic information. The drainage pattern, which was
derived, provided a generally representative depiction of the watershed. The output pixel spacing of 15
m of the produced DEM as well as the high spatial resolution of ASTER imagery found to be quite satisfactory
for the watershed characterization of the study area, indicating the high potential of ASTER
imagery to support watershed management.