Citric acid application for denitrification process support in biofilm reactor

Mielcarek, Artur; Rodziewicz, Joanna; Janczukowicz, Wojciech; Dabrowska, Dorota M.; Ciesielski, Sławomir; Thornton, Arthur; Struk-Sokołowska, Joanna

doi:10.1016/j.chemosphere.2016.12.099

Cited by 28 publications

(20 citation statements)

References 22 publications

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“…Anyway, the adopted rheometer was unable to resolve the shear ). It is worth noting that in the present study a limited number of shear rates has been investigated (i.e., four values for tests 1-4 and 6, and five in case of tests [7][8][9][10][11][12][13][14][15]. This aspect, in principle, may represent an inherent limitation of the work that, however, has the merit to provide a first insight into the rheological behaviour of a highly concentrated thermophilic sludge.…”

Section: Rheological Testsmentioning

confidence: 99%

“…The removal capacity of specific pollutants can be assessed by performing the measurement of metabolic activity, for example, by means of ammonia uptake rate (AUR) and nitrate uptake rate (NUR) tests [5][6][7][8][9] and enzymatic activity quantification [10,11]. Besides, the microscopic observation 2 Journal of Chemistry of floc characteristics and the identification and quantification of filamentous bacteria allow us to highlight disturbances within their community and to foresee the occurrence of specific dysfunctions, for example, sludge foaming, bulking, and solids washout [4,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Scientific literature reports hundreds of applications of conventional and innovative biological tools, as well as examples of investigations based on ecological criteria [9,[20][21][22][23][24][25][26][27]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Rheological Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Abbà

Collivignarelli

Manenti

et al. 2017

Journal of Chemistry

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“…The time needed for biofilm formation and adaptation may vary depending on the technical and technological solutions. In a study conducted by Mielcarek et al [2016Mielcarek et al [ , 2017, the time needed to reach a stable biofilm in the SBBR type reactor working only under anaerobic conditions was ca. 43 days with waste beer used as an organic substrate and ca.…”

Section: Resultsmentioning

confidence: 99%

“…which ensured a stable volume of biomass in the reactor throughout the experiment. A solution of acetic acid was used as the substrate and its dose was adopted after an overview of literature data [Mielcarek et al 2016[Mielcarek et al , 2017Park et al 2008]. The initial concentration of total organic carbon (TOC) in wastewater was assumed at 140 mgC•dm -3 .…”

Section: Synthetic Wastewater and Organic Carbon Sourcementioning

confidence: 99%

Effect of Acetic Acid on Denitrification and Dephosphatation Process Efficiencies in Sequencing Batch Biofilm Reactor

Mielcarek¹,

Rodziewicz²,

Janczukowicz³

et al. 2018

J. Ecol. Eng.

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This study investigates the feasibility of using an organic substrate in the form of acetic acid to enable wastewater denitrification in a Sequencing Batch Biofilm Reactor (SBBR). The impact of nitrates presence on the yield of biological dephosphatation was determined as well. The experiment included 296 cycles and was divided into 4 series differing in the load of nitrates. The N:(C and P) ratios were: 7:(140 and 7); 35:(140 and 7); 70:(140 and 7) and 140:(140 and 7). The hydraulic retention time in the reactor was 12h (6h of mixing-dissolved oxygen concentration below 0.1 and 6h of aeration-concentration of dissolved oxygen 3.0±0.8 mgO 2 •dm-3). The study demonstrated that the 30-day adaptation period (60 cycles) was sufficient for the development of a stable biofilm. The C:N ratio of 2 ensured the total nitrogen concentration in the effluent below 1 mgN•dm-3. The mean efficiency of biological dephosphatation reached 7.0, 17.4, 18.7, and 30.3% in series 1-4, respectively. In the case of series 2 and 3, no significant differences were demonstrated in the total phosphorus concentration in the effluent. In the other series, the differences turned out to be significant.

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Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

Wang

Wei

et al. 2021

Biotech & Bioengineering

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Nitrous oxide (N2O) was previously deemed as a potent greenhouse gas but is actually an untapped energy source, which can accumulate during the microbial denitrification of nitric oxide (NO). Compared with the organic electron donor required in heterotrophic denitrification, elemental sulfur (S0) is a promising electron donor alternative due to its cheap cost and low biomass yield in sulfur‐driven autotrophic denitrification. However, no effort has been made to test N2O recovery from sulfur‐driven denitrification of NO so far. Therefore, in this study, batch and continuous experiments were carried out to investigate the NO removal performance and N2O recovery potential via sulfur‐driven NO‐based denitrification under various Fe(II)EDTA‐NO concentrations. Efficient energy recovery was achieved, as up to 35.5%–40.9% of NO was converted to N2O under various NO concentrations. N2O recovery from Fe(II)EDTA‐NO could be enhanced by the low bioavailability of sulfur and the acid environment caused by sulfur oxidation. The NO reductase (NOR) and N2O reductase (N2OR) were inhibited distinctively at relatively low NO levels, leading to efficient N2O accumulation, but were suppressed irreversibly at NO level beyond 15 mM in continuous experiments. Such results indicated that the regulation of NO at a relatively low level would benefit the system stability and NO removal capacity during long‐term system operation. The continuous operation of the sulfur‐driven Fe(II)EDTA‐NO‐based denitrification reduced the overall microbial diversity but enriched several key microbial community. Thauera, Thermomonas, and Arenimonas that are able to carry out sulfur‐driven autotrophic denitrification became the dominant organisms with their relative abundance increased from 25.8% to 68.3%, collectively.

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Citric acid application for denitrification process support in biofilm reactor

Cited by 28 publications

References 22 publications

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Rheology and Microbiology of Sludge from a Thermophilic Aerobic Membrane Reactor

Effect of Acetic Acid on Denitrification and Dephosphatation Process Efficiencies in Sequencing Batch Biofilm Reactor

Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

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