Scientific Supervisor: Χ. Τσαντήλας
SUMMARY
The physicochemical properties of the liquid treated waste have been studied and produced by the sewage treatment plant of the city of Larissa and suitability for irrigation and partial fertilizing agricultural crops. For this purpose they were scheduled every 15 days wastewater samples and determined the pH properties, electrical conductivity (EC), concentration of ammonium and nitrate nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg ), boron (B) and heavy metal cadmium (Cd), nickel (Ni), lead (Pb), zinc (Zn), copper (Cu), manganese (Mn) and iron (Fe. Also conducted three experiments in the field, in a well -drained , argillopilodes soil classified as Typic Xerochrept, cotton and corn crops . The experimental design in both cases was completely randomized groups with five treatments and four repetitions in each treatment. The treatments included control (M) ( irrigation with fresh water , without inorganic fertilization ), irrigation with fresh water and full mineral fertilization (MF), irrigation with waste rather than inorganic fertilization (W), irrigation with waste and reduced inorganic fertilization (WSF ) and irrigation with waste and complete inorganic fertilization (WTF). Crops irrigated with drip system, the first two years was conventional and the third time was a new technology system which was constructed as part of this program.
The results showed that the treated wastewater Larissa are suitable for irrigation and partial lubrication in both cultures studied. Properties that create restrictions on its use as irrigation water is the concentration of B and sometimes the concentration of Cl. H concentration of the elements necessary to plant nutrition, such as inorganic N, the P and K are high, contributing to plant nutrition unable to replace inorganic fertilizers. The concentration of all heavy metals tested remained very low and in some cases undetectable.
The yields of both crops were affected positively by irrigation with waste. The effect was more pronounced in the irrigation of cotton. Suitable control to a depth of 120 cm showed that there appears to be nitrate N leaching to deeper soil layers. In topsoil appears that accumulation is observed in some cases P and R, while the concentration of heavy metals is not significantly affected. But clearly it appears that there is continuous accumulation of B, which can reach toxic levels in sensitive crops.
Publications
Tsantilas , Ch. And B . Samaras . 1997. Use of treated wastewater for irrigation and fertilization of agricultural crops. Proceedings of the Second Panel . Congress GCG " land reclamation WATER - MANAGEMENT . RESOURCE - Mechanization of Agriculture " , Larisa , 24 to 27 April 1996. Volume A: 549-556.
Tsadilas, C.D. 1996. Irrigation of cotton and maize with treated waste water. Proceedings of 4th ESA Congress, 7-11 July, 1996, Veldhoven - Wagenigen The Netherlands.Vol. I:124-125.
Tsadilas, C.D. 1996. Irrigation of corn with municipal wastewater. ACTA HORTICULTURAE 449(2): 699-706.
Τsadilas, C.D. 1997. Impacts of waste water reuse on some soil properties.
Proceedings of 'Water Management, Salinity, and Pollution Control towards Sustainable Irrigation in the Mediterranean Region' Volume IV pp . 213-225 . 22-26 Sept . 1997, Valenzano (Bari) Italy.
Tsadilas, C., Setatou, H., and Simonis, A. 1997. Use of municipal wastes for fertilisation. II. Irrigation and fertilisation with treated municipal wastewater.
p. 306 of the Congress Guide and Abstracts of the 11th World Fertiliser Congress, 7-13 September, 1997, Gent - Belgium (accepted for publication in the proccedings).
C.D. Tsadilas. 1997. Waste water characteristics of the treatment plant of larissa, Greece related to crop irrigation. Accepted for publication in the proccedings of the 2nd International Conference Advanced Wastewater Treatment, Recycling and Reuse. Milan, 14-16 Sept. 1998. Italy.
C.D. Tsadilas. 1997. Soil contamination with boron due to irrigation with treated municipal wastewater. In R.W. Bell and B. Rerkasen (eds.) Boron in Soils and Plants, 265-270, Kluwer Academic Publ.The Netherlands.