Remediation of chlorophenol- and phenol-contaminated groundwater by a sequencing batch biofilm reactor

Abstract

The paper describes the results of an investigation aimed at evaluating suitability of a lab-scale Sequencing Batch Biofilm Reactor (SBBR) for the remediation of groundwater contaminated by phenol (P) and 2-chlorophenol (2-CP). Kinetics of compound degradation was determined along the bed height in the absence and in presence of effluent recirculation, and with different influent composition (compounds fed separately or in combination in the same stream). SBBR performances with and without recirculation were very satisfactory for all the influent compositions: the system showed 99% removal efficiencies for both phenol and 2-CP and their complete removal was always achieved far before the end of react. In the presence of recirculation, the concentration gradient established during fill was rapidly eliminated and an even biomass distribution along the bed height was formed. Consequently, an acceleration of the elimination process was observed, particularly for phenol that was mostly removed in the first hour of the cycle. When the compounds were fed simultaneously, 2-CP removal kinetics improved probably due to cometabolism. The adsorption phenomena of the toxic compounds on the packing material were studied also, showing about 50% COD removal after 7 hours contact time.

Treatment of UASB-treated recycled paper wastewater using SBR and SBBR: A comparison

“…Actually, the great potential of biofilm reactors for industrial effluent treatment has been extensively reported. For instance, Farabegoli et al (2008) used a lab-scale biofilm reactor to remove COD and AOX from recycled paper wastewater and an average removal efficiency of more than 90% was obtained. Jucherski et al (2019) indicated in his research that SBBRs can achieve 97% COD removal efficiency in domestic sewage treatment.…”

Xenobiotics in the Urban Water Cycle

“…For example, biodegradation of 2-CP and 4-CP was successfully enhanced in the presence of phenol (Basu and Oleszkiewicz 1995;Li and Loh 2005;Aktaş 2006;Farabegoli et al 2008). For example, biodegradation of 2-CP and 4-CP was successfully enhanced in the presence of phenol (Basu and Oleszkiewicz 1995;Li and Loh 2005;Aktaş 2006;Farabegoli et al 2008).…”

Technical and experimental evaluation of an innovative decentralized technology for the municipal wastewater treatment in the city of Rome

“…Much interest has been paid to attached biomass systems since they operate at higher biomass density and therefore allow an increase in applicable organic loadings; besides, the longer hydraulic residence time favour the endogenous metabolism with reduced sludge production. doi: 10.2166/wst.2010.332 A more recent application of the attached biomass is represented by the Sequencing Batch Biofilm Granular Reactor (SBBGR) which couples flexibility of the Sequencing Batch Reactor (SBR) to high biomass densities typical of the biofilm processes (such as the Sequencing Batch Biofilm Reactor, SBBR) (Dollerer & Wilderer 1996;Arnz et al 2000;Wilderer et al 2001;Wilderer & McSwain 2004;Liu & Tay 2006;Farabegoli et al 2008;Li et al 2008).…”