Acclimatin of Sludge for Efficient Removal of Nitrogen from Fermentation Wasterwater : Studies on Biological Nutrients Removal from Fermentation Wastewater (II)

概要

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To establish more efficient conditions for the removal of nitrogen from fermentation wastewater, the nitrification-denitrification recycling process was further studied. Depending on the acclimation conditions, activated sludges were classified into two types, one giving high nitrate concentration in the nitrification basin, the other high nitrite concentration. The former type (nitrate sludge) was vonverted to the latter (nitrite sludge) by maintaining operational conditions, of alkaline pH and high influent loads. The denitrification rate in this process varied widely depending on the type of activated sludge. At a given level of hydrogen donor (BOD), nitrite sludge reduced nitrite at two to three times the rate at which nitrate sludge reduced nitrate.Evolution of nitrous oxide was studie with both types of the sludge. In batch reaction in the denitrifying basin, nitrous oxide was detected only with nitrate sludge under high loads of nitrate and hydrogen donor. In the recycling process, nitrous oxide evolution was scarcely detected occurring in a few cases with nitrate sludge.
公益社団法人日本生物工学会の論文
1981-02-25