Inhibition and recovery of nitrification in treating real coal gasificationwastewater with moving bed biofilm reactor
Huiqiang Li , Hongjun Han , Maoan Du , Wei Wang
DOI:
Received May 04, 2010,Revised July 19, 2010, Accepted , Available online
Volume 23,2011,Pages 568-574
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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.
