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Waste Management & Research, Vol. 15, No. 3, 323-330 (1997)
DOI: 10.1177/0734242X9701500309

Olive-Mill Wastewater Composting: Microbiological Aspects

E. Galli

Istituto di Biochimica ed Ecofisiologia Vegetali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Via Salaria km 29.300; 00016 Monterotondo Scalo (Roma), Italy

L. Pasetti

Istituto di Biochimica ed Ecofisiologia Vegetali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Via Salaria km 29.300; 00016 Monterotondo Scalo (Roma), Italy

F. Fiorelli

Istituto di Biochimica ed Ecofisiologia Vegetali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Via Salaria km 29.300; 00016 Monterotondo Scalo (Roma), Italy

U. Tomati

Istituto di Biochimica ed Ecofisiologia Vegetali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Via Salaria km 29.300; 00016 Monterotondo Scalo (Roma), Italy

Oxygen consumption, microbial growth, lignin and phenol degradation, urease, protease and nitrogenase activity were determined during the composting of an olive- mill wastewaters (OMW)—wheat straw mixture. Oxygen consumption, microbial growth and urease activity were greatly enhanced during the thermophilic phase, reaching their maximum in about three weeks. Casein-hydrolysing protease showed a high initial activity which sharply decreased after 2 weeks. At the end of the thermophilic phase both phenols and lignin were reduced by about 70%. Composting enhanced diazotrophic microflora as indicated by nitrogenase activity which increased at the end of the thermophilic phase. © 1997 ISWA

Key Words: Olive—mill wastewaters • compost • lignin • phenols • urease activity • casein- hydrolysing activity • micro-organisms • oxygen consumption • nitro genase activity.


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