Abstract:-An anaerobic fluidized bed reactor was used to assess the degradation of the surfactant linear alkylbenzene sulfonate (LAS). The reactor was inoculated with sludge from an UASB reactor treating swine wastewater and was fed with a synthetic substrate supplemented with LAS. Sand was used as support material for biomass immobilization. The reactor was kept in a controlled temperature chamber (30±1 ºC) and operated with a hydraulic retention time (HRT) of 18 h. The LAS concentration was gradually increased from 8… Show more
“…In previous research with FBRs filled with different support materials, including sand, Oliveira et al (2010a) obtained results similar to this work. The feed and operating conditions of the reactors were similar, but with a fixed concentration of about 15 mg L -1…”
Section: Resultssupporting
confidence: 88%
“…In this stage, 3 L of feed medium was prepared. This feed consisted of synthetic substrate, prepared as reported by Oliveira et al (2010a) …”
Section: Reactor Operationmentioning
confidence: 99%
“…In recent research, Oliveira et al (2010aOliveira et al ( , 2010b) studied the anaerobic degradation of LAS in a bench scale fluidized bed reactor filled with different support materials. The authors concluded that the anaerobic fluidized bed reactor containing immobilized biomass can be considered to be a feasible reactor configuration for treating LAS.…”
-A fluidized bed reactor was used to study the degradation of the surfactant linear alkylbenzene sulfonate (LAS). The reactor was inoculated with anaerobic sludge and was fed with a synthetic substrate supplemented with LAS in increasing concentrations (8.2 to 45.8 mg l -1 ). The removal efficiency of 93% was obtained after 270 days of operation. Subsequently, 16S rRNA gene sequencing and phylogenetic analysis of the sample at the last stage of the reactor operation recovered 105 clones belonging to the domain Bacteria. These clones represented a variety of phyla with significant homology to Bacteroidetes (40%), Proteobacteria (42%), Verrucomicrobia (4%), Acidobacteria (3%), Firmicutes (2%), and Gemmatimonadetes (1%). A small fraction of the clones (8%) was not related to any phylum. Such phyla variety indicated the role of microbial consortia in degrading the surfactant LAS.
“…In previous research with FBRs filled with different support materials, including sand, Oliveira et al (2010a) obtained results similar to this work. The feed and operating conditions of the reactors were similar, but with a fixed concentration of about 15 mg L -1…”
Section: Resultssupporting
confidence: 88%
“…In this stage, 3 L of feed medium was prepared. This feed consisted of synthetic substrate, prepared as reported by Oliveira et al (2010a) …”
Section: Reactor Operationmentioning
confidence: 99%
“…In recent research, Oliveira et al (2010aOliveira et al ( , 2010b) studied the anaerobic degradation of LAS in a bench scale fluidized bed reactor filled with different support materials. The authors concluded that the anaerobic fluidized bed reactor containing immobilized biomass can be considered to be a feasible reactor configuration for treating LAS.…”
-A fluidized bed reactor was used to study the degradation of the surfactant linear alkylbenzene sulfonate (LAS). The reactor was inoculated with anaerobic sludge and was fed with a synthetic substrate supplemented with LAS in increasing concentrations (8.2 to 45.8 mg l -1 ). The removal efficiency of 93% was obtained after 270 days of operation. Subsequently, 16S rRNA gene sequencing and phylogenetic analysis of the sample at the last stage of the reactor operation recovered 105 clones belonging to the domain Bacteria. These clones represented a variety of phyla with significant homology to Bacteroidetes (40%), Proteobacteria (42%), Verrucomicrobia (4%), Acidobacteria (3%), Firmicutes (2%), and Gemmatimonadetes (1%). A small fraction of the clones (8%) was not related to any phylum. Such phyla variety indicated the role of microbial consortia in degrading the surfactant LAS.
“…In recent years, various destructive methods including biological, chemical and combination of physical-chemical techniques have been employed for removal of the LAS surfactants from waters. The destructive techniques that have been developed for removal LAS are biodegradation [9][10], ozonation [1], photocatalytic degradation over TiO 2 [11][12][13][14][15][16], and Fenton and photo-Fenton [16][17][18][19][20][21]. Biodegradation of LAS in water was found to be less effective for high concentration of LAS, since the LAS is harmful for the bacteria [1].…”
In this chapter, surfactants as cleansing agent in detergent used in laundry, are described. The negative effects of the laundry wastewater on the environment and human health are highlighted. Several methods examined for laundry wastewater treatment are also illustrated. Among the treatment methods, photo-process in the presence of TiO2 photocatalyst and Fenton reagents are described in more detail. Furthermore, the factors influencing the effectiveness of photo-process including reagent dose, reaction time, and pH are discussed. Additionally, modifications of the photo-process to improve its performance that is associated with effectiveness and operational cost are also demonstrated. The photo-methods discussed in this chapter offered low-cost due to simplicity and effective technique for treating the laundry wastewater.
“…Surface active agents are very difficult to remove from water solutions due to their diverse chemical structure and physicochemical properties. Their presence in wastewater treatment plants may result in foaming and inhibition of microorganisms, implying a decrease in treatment efficiency (Oliveira et al, 2010). Surfactants are generally removed by biodegradation (Camacho-Muñoz et al, 2014;Chen et al, 2005), coagulation (Beltrán-Heredia et al, 2012;Aboulhassan et al, 2006), adsorption (Gupta et al, 2003;Hua Wu et al, 2001), foaming (Chen, 1994;Lee et al,), advanced oxidation processes (Karci et al, 2013;Méndez-Díaz et al, 2010) and ion exchange (Yang et al, 2006;Yang et al, 2007).…”
-A system combining nanofiltration and ion exchange for highly effective separation of anionic surfactant from water solutions was proposed. The subjects of the study were nanofiltration polyethersulfone membranes and ion-exchange resins differing in type and structure. The quality of the treated solution was affected by numerous parameters, such as quality of the feed solution, membrane cut-off, resin type, dose and the solution contact time with the resin. A properly designed purification system made it possible to reduce the concentration of anionic surfactant below 1 mg L -1 from feed solutions containing surfactant in concentrations above the CMC value.
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