Anaerobic degradation of linear alkylbenzene sulfonate in fluidized bed reactor

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 8.2±1.3 to 45.8±5.4 mg.L -1 . The COD removal was 91%, on average, when the influent COD was 645±49 mg.L -1 . The results obtained by chromatographic analysis showed that the reactor removed 93% of the LAS after 270 days of operation.

Las degradation in a fluidized bed reactor and phylogenetic characterization of the biofilm

“…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…”

“…In this stage, 3 L of feed medium was prepared. This feed consisted of synthetic substrate, prepared as reported by Oliveira et al (2010a) …”

“…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.…”

Photo-Processes as Effective and Low-Cost Methods for Laundry Wastewater Treatment

“…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].…”

Nanofiltration: ion exchange system for effective surfactant removal from water solutions

“…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).…”