title: Inhibition and recovery of nitrification in treating real coal gasification wastewater with moving bed biofilm reactor.
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 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.
authors.affiliation: State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China. lhq_rainbow@163.com
authors.forename: Huiqiang
authors.initials: H
authors.lastname: Li
authors.forename: Hongjun
authors.initials: H
authors.lastname: Han
authors.forename: Maoan
authors.initials: M
authors.lastname: Du
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
mesh_terms: D000641:Ammonia / Q000302:isolation & purification; D001673:Biodegradation, Environmental; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D003031:Coal; D005740:Gases / Q000737:chemistry*; D058465:Nitrification; D010100:Oxygen / Q000032:analysis; D010636:Phenols / Q000302:isolation & purification; D012722:Sewage / Q000737:chemistry; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000295:instrumentation*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D003031:Coal; D005740:Gases; D010636:Phenols; D012722:Sewage; D000641:Ammonia; D010100:Oxygen