الفهرس 
I. INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
There are many types of dairy wastewater treatment. In our study, we applied one of the biological methods for treating dairy effluent (bacterial biofilm). Ten indigenous bacterial isolates were isolated from mixed dairy wastewater samples collected from effluent discharge points of two manufacturing points for cheese and milk. The isolated bacteria were named consequently from isolate DM1 to isolate DM10.
The ten bacterial isolates were screened to choose the most functional isolate in removing the suggested parameters (BOD), (COD), Total Suspended Solid (TSS), Total Dissolved Solids (TDS), Dissolved Oxygen (DO) and Total Viable Count of Bacteria (TVCB). The results showed that Isolate DM7, Isolate DM6 and Isolate DM5 recorded high activity for removing selective pollutants, while isolate DM2, isolate DM8 and isolate DM10 recorded the lowest removal efficiency for the same parameters. The highest three effective isolates used as individual and mixed free-living cultures in a batch mode remediation process.
In conclusion, isolate DM7 showed the highest degradation of organic matters in dairy wastewater so it was chosen to be fixed in a continuous mode to remediate contaminated dairy effluents. The proposed biofilm system could achieve high removals of the included contaminants in dairy wastewater in a very short time. TSS residues reached safe levels by both treatment systems. The lowest BOD residues recorded 860 and 1010 mg/l in the treated effluent by the biofilm and control systems respectively which are slightly (1.43 and 1.85 -fold) higher than its MPL (600 mg/l) for discharging into the general sanitary drainage network. Finally, the lowest RCs of the COD in the treated effluents recorded 1030mg/land 1245mg/lby the control and biofilm systems respectively,which are 6.36% lower - and 1.13 -fold higher than its MPL (1100 mg/l) for discharging into the general sanitary drainage network.
Such results confirmed the importance and the biotechnological as well as economical values of the proposed biofilm system for removing bulk amounts of the major contaminants (organic matter) from dairy wastewater in a very short time (4 hr.) reaching safe limits for discharging into the general sanitary drainage network.