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Keywords	domestic wastewater, characterization, protein, carbohydrate, lipid, and gravity sewer
Abstract	The design principles of sewer systems as well the composition of the wastewater and climatic conditions vary throughout the world. In practice composition and temperature of the wastewater play an important role to several biological processes when entering the wastewater treatment plant, such as biological nutrients removal, growth of filamentous microorganisms etc. Final composition of “young” wastewater with an age of only minutes to a few hours strongly depends on microbial growth and respiration both in bulk water and sewerage biofilms, on solubilization and enzymatic hydrolysis of macromolecules as it flows in the sewer system to the treatment plant. This paper discusses the composition of the wastewater based on its fate in the sewerage aiming to increase the knowledge about the processes that take place in a sewer system. Special attention is devoted to the organic part and several individual components have been identified and quantified, such as carbohydrates, proteins, lipids, fatty acids and some inorganic compounds, which are important in the biological processes; mainly oxygen, nitrate, ammonium, sulfate and sulfide. The DO concentrations are typically between 0.2-2 mg/L. Fatty acids and sulfide wasn’t detected as expected. The removal of total COD, dissolved COD, proteins, carbohydrates and lipids in percentage of total COD were, on average, 28.7 %, 23.9%, 51.% and 39.9% respectively. Results clearly show that the sewer system should be regarded as a part of the wastewater treatment plant in bioengineering design.
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Name	Affiliation	Home page	e-mail	Total pubs
Aivasidis A	Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67100, Xanthi, Greece		spiadou@env.duth.gr	38
Melidis P	Democritus University of Thrace, Vas. Sofias 12, 67100, Xanthi, Greece		pmelidis@env.duth.gr	16
Siakir A				1
Vaiopoulou E	Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67100, Xanthi, Greece		vaiop@env.duth.gr	13