Autotrophic ammonia removal from landfill leachate in anaerobic membrane bioreactor

作者：Suneethi S^*; Joseph Kurian

来源：Environmental Technology, 2013, 34(24): 3161-3167.

DOI：10.1080/09593330.2013.808241

• landfill leachate
• anaerobic membrane bioreactor
• ANAMMOX
• ammonia removal
• autotrophic

Anaerobic ammonium oxidation (ANAMMOX) process, an advanced biological nitrogen removal, removes ammonia using nitrite as the electron acceptor without oxygen. In this paper, ANAMMOX process was adopted for removing -N from landfill leachate having low COD using anaerobic membrane bioreactor (AnMBR). The AnMBR was optimized for nitrogen loading rate (NLR) varying from 0.025 to 5kg -N/m(3)/d with hydraulic retention time (HRT) ranging from 1 to 3d. -N removal efficacy of 85.13 +/- 9.67% with the mean nitrogen removal rate of 5.54 +/- 0.63kg -N/m(3)/d was achieved with NLR of 6.51 +/- 0.20kg -N/m(3)/d at 1.5d HRT. The nitrogen transformation intermediates in the form of hydrazine (N2H4) and hydroxylamine (NH2OH) were 0.008 +/- 0.005 and 0.006 +/- 0.001mg/l, respectively, indicating co-existence of aerobic ammonia oxidizers and ANAMMOX. The free ammonia (NH3) and free nitrous acid (HNO2) concentrations were 26.61 +/- 16.54mg/l and (1.66 +/- 0.95)x10(-5)mg/l, preventing -N oxidation to -N enabling sustained -N removal.

• 出版日期2013-12-1