Olive-Mill Wastewater Composting: Microbiological Aspects

Abstract

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

Keywords

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

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