Inhibition and recovery of nitrification in treating real coal gasification
wastewater with moving bed biofilm reactor |
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Authors: | Huiqiang Li Hongjun Han Maoan Du and Wei Wang |
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Institution: | State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract: | Moving bed biofilm reactor (MBBR) was used to treat real coal gasification wastewater. Nitrification of the MBBR was inhibited
almost completely during start-up period. Sudden increase of influent total NH3 concentration was the main factor inducing nitrification
inhibition. Increasing DO concentration in the bulk liquid (from 2 to 3 mg/L) had little e ect on nitrification recovery. Nitrification of
the MBBR recovered partially by the addition of nitrifying sludge into the reactor and almost ceased within 5 days. Nitrification ratio
of the MBBR achieved 65% within 12 days by increasing dilute ratio of the influent wastewater with tap water. The ratio of nitrification
decreased to 25% when influent COD concentration increased from 650 to 1000 mg/L after nitrification recovery and recovered 70%
for another 4 days. |
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Keywords: | moving bed biofilm reactor coal gasification wastewater nitrification inhibition nitrification recovery |
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