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Chikhi S.,Blida University | Ferradji F.Z.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | Badis A.,Blida University | Badis A.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | Bouzid B.,Blida University
Desalination and Water Treatment | Year: 2015

Xylene is a hydrophobic and aromatic organic compound widely used as a solvent in various industries and medical technologies. While its use is of a practical and economic significance, it is also considered as a highly toxic compound and a severe source of pollution, especially when it is discharged into nature. The aim of our study was to contribute toward xylene biodegradation using microorganisms that belong to the Streptomyces group. These microorganisms have been subject of an increasing interest in basic research and in biotechnology applications. Our current research is primarily focused on the biodegradation and removal of xylene using free and immobilized Streptomyces sp. AB1 strain, isolated from the Mitidja plain soils (north of Algeria). The follow up of xylene removal kinetics showed higher elimination rates in medium containing xylene as the sole source of carbon (200 and 300 mg l−1). Biodegradation percentage varies between 80 and 99%. GC spectra showed changes during incubation time which is an indication of a microbial attack. Production of biodegradation metabolites was also detected in the medium. In a similar way, the Streptomyces sp. AB1 strain was encapsulated in sodium alginate beads, the result of these investigation shows high xylene removal rate (90%) from contaminated water and that Streptomyces sp. AB1 can regenerate sodium alginate beads without loss of sorption capacity. © 2015 Balaban Desalination Publications. All rights reserved. Source


Badis A.,Blida University | Badis A.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | Ferradji F.Z.,Blida University | Ferradji F.Z.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | And 3 more authors.
Desalination | Year: 2010

Humic acids are considered problematically in drinking water because it can react readily with chlorine to form carcinogen compounds and its biological removal is much recommended. The scanning electron microscopy morphologies and optical parameters observed for natural humic acids (NHAs) extracted from different soils at Mitidja plain (Algeria) made them different from the commercial ones. Three of the most active strains of 19 actinomycetes were isolated and selected from surface soils at this plain. These strains were identified based on cultural characteristics and chemotaxonomic analysis and classified in the genus Streptomyces. Growth of these strains was assured on a poor liquid medium containing NHAs as carbon and nitrogen sources and degradation occur only in the presence of glucose. A maximal decolorization extent was obtained for 28. days at 30 °C under shake culture (67%, 66% and 57% for Streptomyces sp. strain AB1, Streptomyces sp. strain AM2 and Streptomyces sp. strain AH4, respectively). As compared with initial and final structures of NHAs after incubation (28. days), the structural changes in FTIR spectrum and metabolite products analyzed by HPLC indicate the capability of the selected Streptomyces sp. strains to degrade HAs and to play a part role in humus turnover in natural waters. © 2010 Elsevier B.V. Source


Kourdali S.,Blida University | Kourdali S.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | Badis A.,Blida University | Badis A.,Center National Of Recherche Et Of Developpement Of La Peche Et Of Laquaculture 11 | And 3 more authors.
Desalination and Water Treatment | Year: 2013

Humic acids (HA) in water can react with active chlorine to produce carcinogenic compounds and their presence is, therefore, considered as a serious problem in water purification plants throughout the world. The present study was undertaken with the aim of investigating the efficiency of using an electrocoagulation (EC) process based on aluminium electrodes at a laboratory scale as a complementary treatment step for HA removal from surface water. A series of experimental assays were performed to determine the optimal operating conditions (electrolysis time, pH, current intensity and initial concentration) involved in the EC mechanism during the HA removal process. The findings revealed that under optimum conditions HA could be removed by up to 72%. Further, high performance liquid chromatography and Fourier transform infrared spectroscopy analyses showed the non-forming products and non-attack points of the HA molecules, respectively. Overall, the results yielded in a pH range (6-7) and low current density (1.78-7.14 mA/cm2) were promising and indicated that the EC method was effective for the achievement of HA removal from surface waters. © 2013 Copyright Balaban Desalination Publications. Source

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