PHYSICOCHEMICAL METHOD OF PROCESSING LIQUID AND SEMISOLID WASTES OF OLIVE MILLS USING OZONE (O3)

摘要

Physicochemical methods and oxidative process used to solve the problem of pollution of olive mills wastewater. The application of the suggested technology is based on ozone transmission through liquid waste of olive mills by combination with coagulated action of a minimal ferrous sulphate quantity. Using this method detoxification of olive mill wastes is guaranteed with simultaneous decrease of pollution load about 95%. Under acidic conditions and the organic substrate presence and a small ferrous sulphate quantity the ozone is decomposed as follows: O3 + H2O +Fe2+ → O2 + Fe3+ +OH- + OH+ The hydroxyl radicals are very effective and they attack the organic compounds RH in a minimal time and non-selectively resulting organic radicals. The obtained oxygen reacts with them and thus the organic material decomposition takes place the oxidized liquid and wastes are subjected a further ozonization and a biological process in order to be suitable for fertirrigation. The obtained chemical sludge from oxidation and neutralization reactors with the produced biological by aerobic and anaerobic processes, are syn-composted with olive leaves, olive stone and other agricultural wastes on dried up bed in order to produce a fertiliser of the best quality.