期刊
BIORESOURCE TECHNOLOGY
卷 189, 期 -, 页码 250-257出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.03.143
关键词
C/N ratio; OLR; Moving bed membrane bioreactor; Nitrification
资金
- National Operational Programme for Research and Competitiveness
- Project STI-TAM (Sviluppo di Tecnologie Innovative per il trattamento di rifiuti liquidi della navigazione finalizzate alla Tutela dell'Ambiente Marino) [PON 02_00153_2849085, CUP B61C12000840005]
- Italian Ministry of Education, University and Research and Ministry of Economic Development
- Italian Ministry of Education, University and Research [D.M. 1152/ric]
The effect of a sharp variation of C/N ratio in a moving bed membrane bioreactor (MB-MBR) pilot plant treating high strength wastewater has been investigated. The experimental campaign was divided into two periods, each characterized by a different C/N ratio (namely, 2.5 and 15, Period 1 and Period 2, respectively). The MB-MBR system was analyzed in terms of organic carbon removal, nitrification efficiency, biokinetic activity and fouling behavior. The results showed that the nitrification process was severely affected by lower C/N value and by high concentration of ammonia. It was noticed an extensive stress effect on the autotrophic bacteria. Furthermore, it was observed an increase of the resistance related to particle deposition into membrane pores, likely due to a worsening of the cake layer features, with a reduction of the pre-filter'' effect, also related to the increase of the total Extracellular Polymeric Substances production with the C/N ratio. (C) 2015 Elsevier Ltd. All rights reserved.
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