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Nitrogen removal from high organic loading wastewater in modified Ludzack-Ettinger configuration MBBR system

Torkaman, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.2166/wst.2015.343
  3. Publisher: IWA Publishing , 2015
  4. Abstract:
  5. A moving bed biofilm reactor with pre-denitrification configuration was fed with a synthetic wastewater containing high chemical oxygen demand (COD) and ammonia. By changing different variables including ammonium and COD loading, nitrification rate in the aerobic reactor and denitrification rate in the anoxic reactor were monitored. Changing the influent loading was achieved via adjusting the inlet COD (956-2,096 mg/L), inlet ammonium (183-438 mg/L), and hydraulic retention time of the aerobic reactor (8, 12, and 18 hours). The overall organic loading rate was in the range of 3.60-17.37 gCOD/m2·day, of which 18.5-91% was removed in the anoxic reactor depending on the operational conditions. Considering the complementary role of the aerobic reactor, the overall COD removal was in the range 87.3-98.8%. In addition, nitrification rate increased with influent ammonium loading, the maximum rate reaching 3.05 gNH4/m2·day. One of the most important factors affecting nitrification rate was influent C:N entering the aerobic reactor, by increasing which nitrification rate decreased asymptotically. Nitrate removal efficiency in the anoxic reactor was also controlled by the inlet nitrate level entering the anoxic reactor. Furthermore, by increasing the nitrate loading rate from 0.91 to 3.49 gNO3/m2·day, denitrification rate increased from 0.496 to 2.47 gNO3/m2·day
  6. Keywords:
  7. Ammonium loading rate ; Denitrification rate ; Nitrification rate ; Chemical oxygen demand ; Nitrates ; Nitrogen removal ; Loading rate ; MBBR ; Nitrate loading rates ; Organic loading rates ; Loading ; Organic compound ; Aerobic reactor ; Moving bed biofilm reactor ; Biochemical oxygen demand ; Chemistry ; Denitrification ; Evaluation study ; Isolation and purification ; Procedures ; Sewage ; water management ; Ammonia ; Biofilms ; Biological Oxygen Demand Analysis ; Bioreactors ; Nitrification ; Nitrogen ; Organic Chemicals ; Waste Disposal, Fluid ; Waste Water ; Water Purification
  8. Source: Water Science and Technology ; Volume 72, Issue 8 , October , 2015 , Pages 1274-1282 ; 02731223 (ISSN)
  9. URL: http://wst.iwaponline.com/content/72/8/1274