期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 23, 期 4, 页码 568-574出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60449-4
关键词
moving bed biofilm reactor; coal gasification wastewater; nitrification inhibition; nitrification recovery
资金
- High Technology Research and Development Program (863) of China [2007AA06A411]
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 effect 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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