Abstract
The wastewater from the city of Thessaloniki is discharged without treatment to the nearby inner part of the Thessaloniki Gulf. The existing treatment plant is designed for primary treatment and does not operate since the expected effluent quality is not suitable for safe disposal to the available recipients. The paper describes the results of a recent two-year study, aiming to investigate suitable treatment and disposal alternatives and to propose an appropriate upgraded treatment plant. The results of the investigation, which involved application of mathematical modelling of the quality parameters of the gulf, indicate that an environmentally acceptable and technico-economically sound solution consists of a biological treatment system with seasonal nitrogen removal, followed by discharge of the treated effluent to the central part of the gulf, through a marine outfall.
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