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Bioresour Technol

Title:		Process efficiency and microbial monitoring in MBR (membrane bioreactor) and CASP (conventional activated sludge process) treatment of tannery wastewater
Author(s):		Munz G; Gualtiero M; Salvadori L; Claudia B; Claudio L;
Address:		"Department of Civil and Environmental Engineering, University of Florence, 50139 Florence, Italy. giulio@dicea.unifiti.it"
Journal Title:		Bioresour Technol
Year:		2008
Volume:		20080521
Issue:		18
Page Number:		8559 - 8564
DOI:		10.1016/j.biortech.2008.04.006
ISSN/ISBN:		0960-8524 (Print) 0960-8524 (Linking)
Abstract:		"In this study a pilot-scale membrane bioreactor (MBR) and a conventional activated sludge plant (CASP), treating the same tannery wastewaters and in the same operating conditions, have been compared in order to evaluate the overall treatment efficiency, the presence and distribution of Gram negative bacteria and the kinetics of nitrifying bacteria. Process efficiency was evaluated in terms of organic and nitrogen compounds: the MBR showed a higher COD removal (+4%) and a more stable and complete nitrification. The Gram negative bacteria were detected by fluorescent in situ hybridization (FISH) with phylogenetic probes monitoring of alpha-, beta- and gamma-Proteobacteria, of the main ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria of the Nitrobacter and Nitrospira genera. The results showed that the main differences between the two sludges were: the higher abundance of alpha- and gamma-Proteobacteria in the MBR bioreactor and the presence of AOB aggregates only on the surfaces of MBR flocs. Finally, the titrimetric (pH-stat, DO-stat) tests showed similar values of the kinetic parameters of the nitrifiers both in MBR and CASP sludge"
Keywords:		"Bacteria/cytology/*metabolism Biomass Bioreactors/*microbiology Colony Count, Microbial In Situ Hybridization, Fluorescence Kinetics *Membranes, Artificial Sewage/*microbiology *Tanning Volatilization Waste Disposal, Fluid/*methods Water Purification/*met;"
Notes:		"MedlineMunz, Giulio Gualtiero, Mori Salvadori, Laura Claudia, Barberio Claudio, Lubello eng England 2008/05/24 Bioresour Technol. 2008 Dec; 99(18):8559-64. doi: 10.1016/j.biortech.2008.04.006. Epub 2008 May 21"