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Environmental Technology, Vol. 25. pp 1151-1157 © Selper Ltd, 2004 SULFUR FORMATION BY STEADY-STATE CONTINUOUS CULTURES OF A SULFOXIDIZING CONSORTIUM AND THIOBACILLUS THIOPARUS ATCC 23645 S. ALCÁNTARA1, A. VELASCO2 AND S. REVAH3* Instituto Mexicano del Petróleo. Programa de Biotecnología del Petróleo. Eje Central Lázaro Cárdenas 152, C.P. 07730, México D.F. 2 Centro Nacional de Investigación y Capacitación Ambiental (CENICA- INE), Edificio W-3 piso, Apdo. Postal 55-534, C.P. 09340 México, D.F. 3 Departamento de Ingeniería de Procesos e Hidráulica. Universidad Autónoma Metropolitana- Iztapalapa Apdo. Postal 55-534, C.P. 09340 México, D.F. México 1 (Received 9 December 2003; Accepted 16 June 2004) revoke The principal(a) sulfur formation by the partial oxidation of thiosulfate by both a sulfoxidizing mob and by Thiobacillus thioparus ATCC 23645 was studied at a lower place aerobic conditions in chemostat. unconstipated state was attained with b asically total conversion to sulfate when the dissolved atomic number 8 tautness was 5 mgO2 l-1 and at a lower place a dilution come in (D) of 3.0 d-1 for the consortium and 0.9 d-1 for T thioparus. The consortium formed elemental sulfur in besotted state under oxygen limitation.

fifty percent of the theoretical elemental sulfur yield was obtained with a dissolved oxygen concentration of 0.2 mgO2 l -1. Growth of T thioparus was negatively stirred with a concentration below 1.9 mgO2 l-1. consortium yield from bundle cultures was 2.1 g-1protein mol-1thiosulfate, which was comparable with the values obtained in the chemostat at dilution steps of 0.4 d! -1 and 1.2 d-1. The consortium showed a maximum degradation rate of 0.105 gthiosulfate g-1protein min-1 and a intensity level rate for S2O32- of 1.9 mM. Keywords: Sulfur, thiosulfate, sulfur-oxidizing consortium, thiobacilli. INTRODUCTION from wastewater was converted to elemental sulfur below an oxygen concentration of 1 mgO 2 l-1 [7]. Under these conditions, was nominate that the optimal...If you want to give birth a full essay, order it on our website: OrderCustomPaper.com

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