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Περιβαλλοντική ρύπανση σε εδάφη από απόθεση τεφρών παραγόμενων από συν-καύση δημοτικών απορριμάτων, λυμάτων και αγροτικών αποβλήτων του νομού Χανίων

Alexandrakis Stylianos

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Summary

The ever-increasing production of municipal waste and its negative impacts on the environment, as well as the search for new renewable energy sources, create the need for their utilization. Combustion technology is used to recover energy from sewage sludge and municipal solid waste. However, the production of ash during this process requires proper management to avoid the environmental impacts caused upon landfilling.In present master's thesis, ashes from sewage sludge(SS), olive kernel(OK), municipal solid waste (MSW) and mixtures of them were used, after combustion of fuels in a fixed/fluidized bed. For the stabilization of the heavy metals in the ashes during their leaching through soil, fly ash from power station Melitis(FA), ″silica fume‶(SiO2), and wheat straw(WS) were used as stabilizers.Initially, ash was leached through the soil and then stabilizers were added in various proportions. pH, electrical conductivity, major inorganic elements and trace elements, as well as the concentrations of chlorine, sulfur and phosphorus ions were measured int the leachates. In general, the majority of the elements were stabilized in the ash sample of OK/MSW 90:10 with the addition of stabilizers during soil leaching. For a percentage of 10% of stabilizers, a decrease in the leaching rate of all trace elements was observed, while when the mixture of stabilizers was used at 10% each, the reduction in trace elements was higher. For a percentage of 20% of stabilizers, the reduction in trace elements was 100% for all trace elements except Sr, which had very low values, and Cr, which nevertheless decreased significant from 76% to 89%.

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