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Identifier

000441198

Title

Μετεπεξεργασία της απορροής ενός διβάθμιου συστήματος αναερόβιας-αερόβιας επεξεργασίας αγροκτηνοτροφικών αποβλήτων με τη χρήση διεργασιών προσρόφησης και φωτοκατάλυσης

Alternative Title

Post treatment of a two type system of anerobious-aerobic agricultural waste treatment with the use of adhesion and photocatalyst processes

Author

Λυράκη, Πελαγία Ε.

Thesis advisor

Κατσαράκης, Νικόλαος

Reviewer

Δημάδης, Κωνσταντίνος
Μανιός, Θρασύβουλος

Abstract

The agricultural and livestock industries produce large quantities of agricultural waste, which cannot be disposed of directly in the natural environment. Their occurrence in surface and groundwater, but also in soil, intensifies global concern about the serious effects on human health and increases the scientific interest in finding new and more effective methods to remove their pollutants. The object of the present study is to investigate the efficiency of adsorption and photocatalysis processes in the management of effluents from agricultural waste treatment systems. The samples used in our research resulted from the mixing of three types of livestock waste. Specifically, they came from liquid waste from a cheese factory, a pigsty and an olive mill. Initially, three mixtures of the waste were treated by a two-stage system (aerobic & anaerobic processes) followed by their post-treatment by adsorption and photocatalysis where the TiO₂ and ZnO catalysts were used. The results of the above processes regarding the percentage of pollutant load removed from our samples, were particularly encouraging. In the 1st and 2nd sample of waste we observe that the best percentages of dirt removal were obtained in the case where a catalytic powder of constant concentration 500 ppm TiO₂ P-25 Degussa was used and the pH of the solution was adjusted to 2. In addition, remarkable results are observed after irradiation cases of experiments where in the respective solution in addition to the TiO₂ catalyst P-25 Degussa was added an amount of H₂O₂. In order to complete the work, the possibility of recycling the TiO₂ catalyst was additionally examined. The recyclability of the catalyst is very important for the methods of adsorption and photocatalysis as it helps to reduce the cost of application of both methods, while at the same time avoiding additional burden on the environment. Exactly this property of durability and non-inactivation of the catalyst was studied by recycling the catalyst once.

Language

Greek

Subject

Adsorption

Photocatalysis

TiO2

Titanium dioxide

Zinc oxide

ZnO

Διοξείδιο του τιτανίου

Ετερογενής φωτοκατάλυση

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