Abstract
This work assesses the changes, the causes and the impact of pollutant loads from treated wastewater in a typical Mediterranean coastal water body. Focusing on wastewater treatment and industrial plants, assessment is based on the analysis of systematic pollution indicators, such as the carbonaceous material, suspended solids and nutrients for the period 2009–2012. It occurs that Kavala Gulf receives annually approximately 5 million m3 from point sources. Organic matter, ammonia, nitrate and nitrite, and phosphorus annual loads increased sharply in 2012 to 130, 13, 8 and 12 tons, respectively, due to wastewater treatment technical inefficiencies. Additional nitrogen (390 tons) and phosphorus (53 tons) annual discharges from a phosphoric fertilizer plant raise significantly the inorganic pollution levels in the study area, causing frequent eutrophication incidents. Reduction of discharged volumes could be achieved through wastewater reclamation and reuse, either covering internal wastewater treatment plant requirements and/or watering urban and suburban green areas and groves and forests, cleaning streets, supplying water to firefighting systems, and irrigating agricultural and peri-urban landscape.
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