The Soreq Biological wastewater Treatment Plant has been in operation almost one and a half years. The treatment performance and operational data obtained during the first year of full-scale operation, following the running-in period, are detailed in this paper as four consecutive seasonal operating periods. The results achieved have demonstrated the efficiency, in carbonaceous matter removal and the nitrification-denitrification processes, of the single-stage system, operated without primary treatment.

The influence of various operating parameters on the efficiency of the biological process and on the sludge settleability have been analysed. Two anaerobic tanks, preceding the anoxic zone of the biological reactors, were brought into operation at the end of March 1988. The influence of their addition to the biological process train has also been included herein.

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