Anoxic–aerobic SBR system for nitrate, phosphate and COD removal from high-strength wastewater and diversity study of microbial communities

Jena, Jyotsnarani; Kumar, Ravindra; Saifuddin, Md; Dixit, Anshuman; Das, Trupti

doi:10.1016/j.bej.2015.09.007

Cited by 63 publications

(25 citation statements)

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“…Hence, the alternate anaerobic and aerobic stages in an SBR provide a major advantage over conventional biological systems and can be especially useful with samples containing C 2 H 2 O 4 , a recalcitrant byproduct formed in the Fenton oxidation reaction . In addition, the joint presence of C and nitrate sources under anoxic conditions can facilitate denitrification and increase the substrate uptake rate in the subsequent aerobic period . The active sludge used in the biological oxidation acclimated during the SBR cycles and facilitated removal of some byproducts present in the effluents from the Fenton oxidation of TMX.…”

Section: Resultsmentioning

confidence: 99%

“…60 In addition, the joint presence of C and nitrate sources under anoxic conditions can facilitate denitrification and increase the substrate uptake rate in the subsequent aerobic period. 61 The active sludge used in the biological oxidation acclimated during the SBR cycles and facilitated removal of some byproducts present in the effluents from the Fenton oxidation of TMX.…”

Section: Biological Oxidationmentioning

confidence: 99%

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Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Thiamethoxam (TMX) is a potential insecticide pollutant of hydric resources that must be removed. Advanced oxidation processes (AOPs) are usually effective, but expensive to implement. Combining Fenton's reagent with biological oxidation circumvents the shortcomings of Fenton technology, facilitating the biodegradation of the resulting effluents in a sequencing batch reactor (SBR). RESULTS Fenton‐like oxidation of TMX with variable hydrogen peroxide (H2O2) doses afforded total organic carbon (TOC) conversion and chemical oxygen demand (COD) removal by (respectively) 40% and 80% from pure TMX, and 40% and 60% from commercial TMX. The effluents from Fenton oxidation using substoichiometric H2O2 doses were less ecotoxic and more biodegradable than the initial solution and, therefore, susceptible to a biological treatment. Biological oxidation of effluents obtained from 50% and 75% H2O2 doses was accomplished for different organic loads in 6‐h cycles. Coupling Fenton and biological oxidation of TMX afforded TOC conversion and COD removal of 80% for the effluent obtained with a 75% H2O2 dose. CONCLUSIONS Coupling Fenton–biological oxidation efficiently reduces the amounts of H2O2 needed and produces biodegradable effluents. In addition, the biological treatment increases COD and TOC removal by ≤80% for the overall treatment. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Biological Oxidationmentioning

confidence: 99%

Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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“…Almost all the biological processes have been explored in terms of biomass composition (bacteria, protozoa, metazoan, and fungi) and activity: conventional activated sludge, attached biomass, membrane reactors, and treating either municipal [27][28][29][30][31][32][33][34] or industrial wastewater [35][36][37][38][39]. Likewise, identification and quantification of microorganisms operating under different conditions (aerobic, anoxic, and anaerobic) have been reported [25,[40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Abbà

Collivignarelli

Manenti

et al. 2017

Journal of Chemistry

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A thermophilic aerobic membrane reactor (TAMR) treating high-strength COD liquid wastes was submitted to an integrated investigation, with the aim of characterizing the biomass and its rheological behaviour. These processes are still scarcely adopted, also because the knowledge of their biology as well as of the physical-chemical properties of the sludge needs to be improved. In this paper, samples of mixed liquor were taken from a TAMR and submitted to fluorescent in situ hybridization for the identification and quantification of main bacterial groups. Measurements were also targeted at flocs features, filamentous bacteria, and microfauna, in order to characterize the sludge. The studied rheological properties were selected as they influence significantly the performances of membrane bioreactors (MBR) and, in particular, of the TAMR systems that operate under thermophilic conditions (i.e., around 50 ∘ C) with high MLSS concentrations (up to 200 gTS L −1 ). The proper description of the rheological behaviour of sludge represents a useful and fundamental aspect that allows characterizing the hydrodynamics of sludge suspension devoted to the optimization of the related processes. Therefore, in this study, the effects on the sludge rheology produced by the biomass concentration, pH, temperature, and aeration were analysed.

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“…The efficiency is higher than the efficiencies obtained [9,20], which were 78.4% and 79.4%, respectively. The higher efficiency is due to better aeration according to the defined time (2 h).…”

Section: Discussionmentioning

confidence: 47%

“…Sequencing batch reactor (SBR) as modified version of activated sludge is one of the most successful methods in nutrient removal [7][8][9][10]. SBR systems have replaced other conventional systems in the biological treatment of industrial and sanitary wastewater due to their numerous advantages.…”

Section: Introductionmentioning

confidence: 99%