الفهرس 
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Abstract
Two wastewater treatment pilot plants were operated for 36 weeks in AI Gassim region in the period from January 2010 till end of September 2011. The first pilot plant is activated sludge process (extended aeration) and second pilot plant is MBR. The samples were collected 5 days per week. The total number of collected and analyzed samples was 180 samples. The characteristics of the influent and clarified effluent from both plants were determined. The results from MBR plant can be summarized as follows:
The influent COD concentration ranges from 212 mg/l to 401 mg/l and effluent COD concentration ranges from 4 mg/l to 28 mg/J. The COD removal efficiency ranges between 93% and 98%. The concentration of BODs in the influent to the MBR pilot plant ranges from 179 mg/l to 328 mg/J. The BOD concentration in the treated effluent does not exceed 14 mg/J. The removal efficiency of BODs ranges from 96% to 97%. The concentration of SS in the influent to the MBR pilot plant ranges from 183 mg/l to 24 I mg/l. The treated effluent is very clear and the concentration of SS does not exceed I I mg/J. The removal efficiency of SS ranges from 95% to 98%. The concentration of ammonia in the influent to the MBR pilot plant ranges from 18 mg/l to 25 mg/J. The removal efficiency of ammonia ranges from 44% to 98%. The low removal efficiency of ammonia could be attributed to the high organic load influent to the pilot plant which utilizes the oxygen for its degradation and there is no enough oxygen for nitrification process to be completed.The activated sludge pilot plant was operated for 36 weeks. The samples were collected 5 days per week. The total number of collected and analyzed samples was 180 samples: The results illustrate 36 samples (each sample is the average of results for each week).The influent COD concentration to the Activated Sludge Extended Aeration (ASEA) pilot plant ranges from 212 mg/l to 401 mg/l and effluent COD concentration ranges from 24 mg/l to 39 mg/J. The COD removal efficiency ranges between 89% and 91 %.
The concentration ofBODs in the influent to the ASEA pilot plant ranges from 179 mg/l to 328 mg/J. The BOD concentration in the treated effluent does not exceed 18 mg/J. The removal efficiency ofBODs ranges from 93% to 95%. The concentration of SS in the influent to the ASEA pilot plant ranges from 183 mgll to 241 mg/1. The treated effluent is very clear and the concentration of SS does not exceed 17 mg/1. The removal efficiency of SS ranges from 93% to 97%. The effluent concentration of TSS ranges from 6 to 17 mg/1. The concentration of ammonia in the influent to the ASEA pilot plant ranges from 18 mg/I to 25 mg/1. The removal efficiency of ammonia ranges 19% to 97%. The low removal efficiency of ammonia could be attributed to the high organic load influent to the pilot plant which utilizes the oxygen for its degradation and there is no enough oxygen for nitrification process to be completed. The effluent quality from MBR pilot plant is better than that from activated sludge pilot plant.The research proves that Membrane Bioreactor Technology provides a good alternative to the conventional treatment of municipal wastewater at small wastewater treatment plants.