Indexed by:期刊论文

Date of Publication:2011-01-15

Journal:JOURNAL OF HAZARDOUS MATERIALS

Included Journals:SCIE、EI、PubMed

Volume:185

Issue:1

Page Number:249-254

ISSN No.:0304-3894

Key Words:Aerobic granules; Partial nitrification; Inhibitor; Chlorate

Abstract:Partial nitrification was successfully achieved with addition of 5 mM KClO(3) in the aerobic granules system. Batch tests demonstrated that KClO(3) selectively inhibited nitrite-oxidizing bacteria (NOB) but not ammonia-oxidizing bacteria (AOB). During stable partial nitrificat on, the influent pH was kept at 7.8-8.2, while the DO and temperature were not controlled in the SBR. Whim the NH(4)-N and COD levels were kept at 100 mg/l and 400 mg/l in the influent, the NH(4)-N and COD removal efficiencies reached 98.93% and 78.65%, respectively. The NO(2)-N accounted for 92.95% of the NO(x)-N (NO(2)-N + NO(3)-N) in the effluent. Furthermore, about 90% of the chlorate was reduced to nontoxic chloride, thus it would not cause environmental problem. SEM showed that the main composition of the aerobic granules was bacilli and coccus bacteria. FISH analysis revealed that AOB became the dominant nitrifying bacteria, whereas NOB were detected only in low abundance. Chlorate could be used to control the development and maintenance of aerobic granules sludge for partial nitrification. (C) 2010 Elsevier B.V. All rights reserved.