期刊名称：Revista Internacional de Contaminación Ambiental
印刷版ISSN：0188-4999
出版年度：2017
卷号：33
页码：83-104
语种：English
出版社：Centro de Ciencias de la Atmósfera
摘要：The objective of this work was to assess the impact of perchloroethylene (PCE) and coupled zero valent iron (ZVI) filters on the transient performance of fluidized bed bioreactors (FBBRs) operated in simultaneous electron acceptors modes. Four lab scale, FBBRs were implemented. Two FBBRs were operated as simultaneous methanogenic-denitrifying (MD) units, whereas the other two were operated in partially-aerated methanogenic (PAM) mode. In the first period all FBBRs received a synthetic wastewater with 1 g COD-methanol/L. In a second period, all the FBBRs received the synthetic wastewater plus 80 mg PCE/L. At the start of period 2, one MD and one PAM FBBRs were coupled to side sand-ZVI filters. All bioreactors anchored microbial consortia unacclimated to PCE. In this work, bioreactor performance in the full period 1 and the first 15 days of period 2 (transient state) is reported and discussed. The chemical oxygen demand and the nitrate removal efficiency of the FBBRs did not decrease between period 1 and period 2, i.e., upon PCE addition, particularly for MD bioreactors. On the contrary, specific oxygen uptake rate of all FBBRs in period 2 decreased by ca. 80 to 96 % or more compared to period 1. In period 2, PCE removals and dehalogenation efficiency were in the range of 81 to 94 % and 73 to 90 %, respectively. The highest values corresponded to PAM bioreactors, particularly for that equipped with ZVI filter. Slight positive effects of ZVI filter on PCE removal and the dehalogenation efficiencies were observed in the PAM ZVI bioreactor configuration. It is concluded that the simultaneous electron acceptor type (PAM vs. MD) had a significant effect on the bioreactor performance, whereas the coupling to ZVI filters only had a slight positive effect on the bioreactor performance in the PAM-ZVI bioreactor.
关键词：fluidized bed;partially-aerated methanogenic;simultaneous methanogenic-denitrifying;zero-valent iron
