الفهرس 
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Abstract
The present study aims to assess and characterize wastewaters of some industrial and domestic activities in New Damietta city, Egypt through studying the applicability of categorizing the studied wastewaters according to their capability or non-capability for biological treatment, to introduce a new concept of treating the wastewaters in new Damietta according to the similarities in wastewater characteristics. This is through studying the biodegradability of some industrial wastewaters during 28 days. Some other physical-chemical characteristics were measured, in addition to fractionation of wastewater on the basis of its solids and organic contents. BOD520/COD ratio was also calculated for the investigated wastewater samples.
The extent of biodegradability of eleven investigated industrial effluents and the effluent of the main New Damietta drain at its estuary (site 15) was evaluated and assessed. The tests were carried out individually for each kind of wastewater and this was generally by conducting the 28 days biodegradability experiments (manometric determination of BOD for 28 days) for the effluents. The biodegradability curves represented for the investigated wastewater revealed that there were significant differences in the biodegradability of the tested wastewaters.
The biodegradability studies showed that seven of the eleven investigated industrial effluents were medium biodegradable (Al-Domiaty Factory for Dairy Products, Scientific Company for Chemical Industries (Glue Factory), Al-Taawon Petrol Station, Caker for Food Industries, Egypt – Italy Company for Food Industries (Guava), Egypt – Italy Company for Food Industries (Tomato), and Tera Factory for Detergents Industry); two effluents were moderately biodegradable (Al-Nakaiti for the Production of Sesame Paste and Halva and Shrarko Factory for Fragrances and Cosmetics Industry); while, one effluent was easily biodegradable (Al-Alamia Company for Oil Refining and Processing (After Treatment) and another effluent was maximum inert of biodegradability (Kassier El-Dail Factory for Tiles).
For the main New Damietta drain at its estuary, the biodegradability studies demonstrated that the biodegradability of the wastewater at the estuary was medium biodegradable. BOD520/COD ratio for the investigated effluents relatively agreed with the results of the biodegradability curves.
There is a lot of organic and inorganic pollution resulted from the factories of the industrial zone at New Damietta city and discharges to the main New Damietta drain, which flows directly into the Mediterranean Sea without treatment, and in turn adversely affects the marine environment.