Hybrid membrane bioreactor technology for small water treatment utilities: Process evaluation and primordial considerations

Ravindran, Varadarajan; Tsai, Hsun-Hao; Williams, Mark; Pirbazari, Massoud

doi:10.1016/j.memsci.2009.07.032

Cited by 45 publications

(17 citation statements)

References 47 publications

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“…During the biological process of denitrification, nitrate is microbiologically reduced over nitrite to molecular nitrogen (N 2 ) [1,5]. The efficiency of biological removal of nitrate depends on different types of carbon sources [6,7], various types of microorganisms [6,8] and different operational parameters such as carbon to nitrogen (C/N) ratios [2,9], temperature [3,[10][11][12], pH [3,10], dissolved oxygen [13,14] and mixed liquor suspended solids (MLSSs) [15,16]. Furthermore, it also depends on the amount of substrate and heterotrophic yield [17].…”

Section: Introductionmentioning

confidence: 99%

Nitrate Removal from Groundwater with Membrane Bioreactor

Simonič¹,

Goršek²,

Petrović³

2017

Nitrification and Denitrification

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The aim of this study is to model the denitrification process performed in a membrane bioreactor (MBR). The research was carried out using a modified Zenon ZeeWeed 10 MBR system. The membrane module consisted of submerged hollow-fibre membrane with a pore size of 0.04 µm and an active area of 0.93 m 2 . The concentration of nitrate in drinking water was (70 AE 2) mg/L NO 3 À . During the experiment, we maintained a constant concentration level of activated sludge at approximately 0.76 g/L under anoxic conditions. Sugar was added to the activated sludge as a source of carbon. The Monod kinetic parameters were estimated based on the experimental data numerical interpolation. Afterwards, a dynamic simulation with known parameters was carried out, and the time dependence of the substrate and biomass concentration was studied. We developed a model based on actual substrate outlet concentration. In addition, the time required to reach a steady state was estimated.

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Section: Introductionmentioning

confidence: 99%

Nitrate Removal from Groundwater with Membrane Bioreactor

Simonič¹,

Goršek²,

Petrović³

2017

Nitrification and Denitrification

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“…Most published studies on virus removal by MBRs focused on bench-and pilot-scale MBR systems and bacteriophages such as MS2, T4 and F-specific and somatic coliphage (Cicek et al 1998, Hu et al 2003, Shang et al 2005, Comerton et al 2005, Fiksdal and Leiknes 2006, Lv et al 2006, Zhang and Farahbakhsh 2007, Zheng and Liu 2007, Tam et al 2007, Ravindran et al 2009, Hirani et al 2010, Chaudhry et al 2015a, Fox and Stuckey 2015, Hmaied et al 2015, van den Akker et al 2014. Two bench-scale studies employed human viruses; (Madaeni et al 1995) reported that the removal of poliovirus ranged from 1.3 to 1.8 logs while (Ottoson et al 2006) showed that the log reduction value (LRV) for enterovirus and norovirus ranged from 0.5 to 1.8 logs.…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure relaxation and membrane backwash on adenovirus removal in a membrane bioreactor

2016

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Pressure relaxation and permeate backwash are two commonly used physical methods for membrane fouling mitigation in membrane bioreactor (MBR) systems. In order to assess the impact of these methods on virus removal by MBRs, experiments were conducted in a bench-scale submerged MBR treating synthetic wastewater. The membranes employed were hollow fibers with the nominal pore size of 0.45 μm. The experimental variables included durations of the filtration (tTMP>0), pressure relaxation (tTMP=0) and backwash (tTMP<0) steps. Both pressure relaxation and permeate backwash led to significant reductions in removal of human adenovirus (HAdV). For the same value of tTMP>0/tTMP=0, longer filtration/relaxation cycles (i.e. larger tTMP+tTMP=0) led to higher transmembrane pressure (TMP) but did not have a significant impact on HAdV removal. A shorter backwash (tTMP<0 = 10 min) at a higher flow rate (Q = 40 mL/min) resulted in more substantial decreases in TMP and HAdV removal than a longer backwash (tTMP<0 = 20 min) at a lower flow rate (Q = 20 mL/min) even though the backwash volume (QtTMP<0) was the same. HAdV removal returned to pre-cleaning levels within 16 h after backwash was applied. Moderate to strong correlations (R(2) = 0.63 to 0.94) were found between TMP and HAdV removal.

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“…The biological removal of nitrate can be affected by various factors: different types of external C sources [6,7], various types of micro-organisms [6,8], various operational parameters such as C/N ratios [2,9,10], temperature [3,[11][12][13], pH [3,11], dissolved oxygen [12,14,15], hydraulic retention time [16][17][18], nitrate and nitrite concentratios [11,19] and mixed liquor suspended solids [10,20]. In addition, nitrate removal highly depends on the substrate amount that influences the denitrification rate, denitrification yield, and the composition of the microflora [6,21].…”

Section: Introductionmentioning

confidence: 99%

“…Although, the most commonly used relation describing microbial growth is Monod kinetics [28][29][30] and the heterotrophic denitrification is usually assumed as being described by Monod expressions [19]. There are several factors next to the pH, temperature, and dissolved oxygen [12,31], that can affect microbial growth and kinetics: type of substrate [2,9], microbial population [13,32,33], type of water source [32]. Microbial growth, the kinetics, and the influences of different physico-chemical factors have been extensively investigated over recent papers [12,29,30,34].…”

Section: Introductionmentioning

confidence: 99%

“…There are several factors next to the pH, temperature, and dissolved oxygen [12,31], that can affect microbial growth and kinetics: type of substrate [2,9], microbial population [13,32,33], type of water source [32]. Microbial growth, the kinetics, and the influences of different physico-chemical factors have been extensively investigated over recent papers [12,29,30,34].…”

Section: Introductionmentioning

confidence: 99%

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A kinetic study on drinking water denitrification using a membrane bioreactor

2015

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This study determines the basic parameters of Monod kinetics for microbial growth within a membrane bioreactor using the Zenon ZeeWeed 10 MBR system. The influent nitrate concentration was kept at 70 ± 2 mg L -1 NO 3ˉ. During the experiments a constant concentration of activated sludge was maintained at approximately 0.76 g L -1 under anoxic conditions. Sucrose was added to the activated sludge as a carbon source. The Monod kinetic parameters were calculated by numerical interpolation, by considering experimental data. The maximum specific growth rate of the biomass was determined to be 0.31 h

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Hybrid membrane bioreactor technology for small water treatment utilities: Process evaluation and primordial considerations

Cited by 45 publications

References 47 publications

Nitrate Removal from Groundwater with Membrane Bioreactor

Nitrate Removal from Groundwater with Membrane Bioreactor

Effect of pressure relaxation and membrane backwash on adenovirus removal in a membrane bioreactor

A kinetic study on drinking water denitrification using a membrane bioreactor

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