Nitrification of Wastewaters Containing Organic Carbon and Inorganic Nitrogen by Rotating Disc Contactor

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概要

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• The efficiency of wastewater treatment by means of a rotating dics was studied with an artificial wastewater containing organic carbon and inorganic nitrogen. It was found that the COD loading must be reduced to below 0.0106 mg/cm^2・h for nitrification to occur in the rotating disc system. To explain this result, effect of the COD loading on the nitrification was investigated by using the same microorganisms under the suspended conditions in a continuous system, in which 500mg/l of COD with 15l/day of flow rate was continuously fed under a high level of dissolved oxygen concentration (above 5mg/l). Under the condition, nitrification reached more than 90%. The result shows that high COD loading did not affect nitrification in the suspended conditions wherein no oxygen is limiting.The effect of pH on the nitrification rate was examined in a susmpended growth system, using microorganisms scraped from the rotating discs. An optimal pH value was between 7.7 and 8.3. This optimal range was nearly the same as in the pure cultures (Nitrosomonas and Nitrobacter).Although specific in the sense of only ammonia being converted to nitric acid by nitrification, an equation that could formulate the amount of sodium bicarbonate and carbonate to be added into the synthetic wastewater was derived from the theory of acid-base equilibria to warrant a range of pH values from 7.7-8.3 for the favorable activities of nitrifying microorganisms on the rotating disc contactor.

• 公益社団法人日本生物工学会の論文
• 1982-08-25

著者

• Maeda Yoshimichi

  Department Of Applied Chemistry Faculty Of Engineering Himeji Institute Of Technology

• Suga Kenichi

  Department Of Fermentation Technology Faculty Of Engineering Osaka University

• BOONGORSRANG ARUNWON

  Department of Fermentation Technology, Faculty of Engineering, Osaka University

• Boongorsrang Arunwon

  Department Of Fermentation Technology Faculty Of Engineering Osaka University

• SUGA KENICHI

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

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