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In order to define an efficient pre-treatment of Olive Oil Mill Wastewater (OOMW) to overcome major obstacles to biological treatment, various organic and mineral coagulants have been tested. In particular, the application of quicklime until a pH around 12 - 12.4 was reached, allowed the reduction of almost 37% of the initial COD, and approximately 88% and 71% of the colour and phenolic content of the waste. Hence, further biological treatments with an adapted aerobic consortium (AC) and a white rot fungus (WRF) strain were improved. The WRF Coriolopsis polyzona was more efficient than AC to reduce colour and polyphenols when the waste was prior diluted or pre-treated; however, it was less effective in COD removal. The combined treatment: lime - AC of OOMW having initial COD of 102 g l(-1) led to the elimination of about 77, 91 and 63%, of the COD, phenols and colour, respectively. Interestingly, the opposite combination AC - lime permitted better COD, phenols and colour reduction to respectively, 21, 11 and 11% of the initial values. This latter condition is technically recommended since only one step separation was needed and no pH correction was necessary before undergoing aerobic treatment. Moreover, the process would produce a sludge potentially rich in organic matter, and consequently, useful as an agricultural amendment or/and as an additive in animal nutrition.

(Re~u le 2 mars 1972)Residues from the evaporation of pure or mixed solutions of Ca(HCO3)2 and Mg(HCO3)2 were subjected to investigation by DTA (N 2 or CO2 atmosphere), TG, EGA, X-ray and classical chemical analysis. The Ca/Mg atomic ratio exerted a great effect on EGA and DTA peaks between 400 and 500 ~ Peak temperatures were the lowest when 1.2 < Ca/Mg < 1.33. When Ca/Mg < 1.25, CaCO8 exists only as aragonite. When Ca/Mg > 1.25, calcite progressively replaces aragonite, but never entirely. Investigations are continuing.

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Rue de 1 "Epargne, 56 -B 7000 MONS (Belgium). SUMMARY.