Efficiency of Nutrient Removal from Household
Wastewater in Nonwoven Bioreactors

Chmielowski, Krzysztof; Mazur, Robert; Nowak, Andrzej; Bedla, Dawid; Mazurkiewicz, Jakub; Spychała, Marcin

doi:10.15244/pjoes/90624

Cited by 3 publications

(8 citation statements)

References 16 publications

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“…The calculated real velocity of liquid vL was almost two-fold greater; for variant H34, it ranged from 0.5 to 0.54 m/s, while, for variant H84, it was from 1.24 to 1.27 m/s. For variant H34, the gas holdup αG, in the segment from the diffuser (6) to the nozzle pipe H, was approximately 30% greater than for the alternative variant H84. This value was approximately 0.48.…”

Section: Parameters Describing Hydraulic Conditionsmentioning

confidence: 88%

“…where c sT is the oxygen concentration under the measurement conditions (g/m 3 ), τ is the temperature correction factor, equal to c sT /c s20 , where c s20 is the state of oxygen saturation for clean water at 20 • C (c s20 = 9.08 g/m 3 ), Ω is the pressure correction factor, equal to P b /P s , where P b is barometric pressure at the measurement conditions and P s is the pressure value under standard conditions (1 atm), k L a T is the oxygen transfer coefficient at the measurement temperature T (h −1 ), and T is the temperature of measurement ( • C). Standard oxygen transfer efficiency (SOTE) is the percentage amount of oxygen used in relation to the introduced oxygen stream (Equations (6) and 7).…”

Section: Aeration Parametersmentioning

confidence: 99%

“…The standard oxygen transfer efficiency (SOTE) was calculated based on Equation (6). The mass oxygen jet from air W O2 was established from Equation 7.…”

Section: Calculation Of Aeration Parametersmentioning

confidence: 99%

“…The value of αL was inversely proportional to αG for all six structural design variants of the hybrid reactor. The location of nozzle pipe H at the pumping segment of the airlift (9) considerably altered proportions of the two-phase liquid-gas mixture at the segment from the diffuser (6) to the pipe element (H) and flow velocity for both mixture phases. The higher position of the nozzle pipe H (H84) increased the share of liquid in the mixture and superficial velocity, as well as actual flow of liquid.…”

Section: Parameters Describing Hydraulic Conditionsmentioning

confidence: 99%

“…If the systems are placed in a tank with additional elements promoting circulation and/or with a filling material in the form of large specific surface area profiles, they may be the main components of an ALR, providing appropriate conditions for the removal of contaminants and periodic transport of the treated liquid [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

Kujawiak

Makowska

Mazurkiewicz

2020

Water

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Barbotage reactors such as airlift reactors (ALR) and bubble column reactors (BCR), due to their two-phase flow systems, were investigated in many research papers. In their basic design variants, they are typically used to lift, mix, and aerate liquids, while, when equipped with additional elements in hybrid variants, their individual properties, i.e., lifting, mixing, and aeration of liquids, can significantly change with the same reactor geometry. The object of this study was to develop a hybrid barbotage reactor in various structural design variants. The structure consisted of a barbotage column of 50 mm in diameter, used to transport a water–air mixture outside the reactor (so-called external loop). The installation was additionally equipped with a nozzle in order to improve mixture aeration and circulation efficiency. The nozzle was mounted at various heights of the column pump segment. Additionally, the reactor was equipped with s moving bed in two variants (20% and 40% reactor capacity) in order to determine its effect on the mixture aeration and circulation conditions. Based on the measurement results, aeration curves were prepared for various structural design and column packing variants of the reactor. Properties of the two-phase mixture were determined for both parts—ALR and BCR. Technological and energy parameters of the aeration process were calculated, and the results obtained for the individual structural design variants were compared. It was found that, for the most advantageous design, in terms of aeration efficiency, the aeration nozzle should be placed in the mid-length of the pump segment of the barbotage column, irrespective of the hybrid reactor packing rate with the moving bed. The reactor packing with the moving bed resulted in a decreased mean water velocity in the reactor. For most analyzed structural design variants, the respective packing with the moving bed had no significant effect on aeration efficiency. Only for one structural design variant did the lack of packing significantly improve oxygen levels by as much as approximately 41%.

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Section: Parameters Describing Hydraulic Conditionsmentioning

confidence: 88%

Section: Aeration Parametersmentioning

confidence: 99%

“…The standard oxygen transfer efficiency (SOTE) was calculated based on Equation (6). The mass oxygen jet from air W O2 was established from Equation 7.…”

Section: Calculation Of Aeration Parametersmentioning

confidence: 99%

Section: Parameters Describing Hydraulic Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

Kujawiak

Makowska

Mazurkiewicz

2020

Water

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Changes in Concentrations and Loads of Total Phosphorus in Domestic and Treated Wastewater Over a 15-Year Observation Period in Terms of Limiting Negative Anthropopressure on the Quality of Surface Water – Case Study

Kaczor¹

2020

Acta Sci. Pol. Formatio Circumiectus

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Aim of the studyThe main aim of the research was to verify the thesis that formal and legal restrictions on the use of phosphorus compounds, particularly polyphosphates, in detergents extensively introduced in recent years reduced the concentration and load of this nutrient in raw sewage inflowing to the selected treatment plant. Additionally, it was tested whether the phosphorus decreasing in raw sewage reduced the concentrations and loads of total phosphorus in treated sewage, and thus reduced negative sewage anthropopressure of the water body. Material and methodsThis paper presents observations accumulated during the 15-years study (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015), the concentrations and loads of total phosphorus in domestic sewage flowing into the selected treatment plant, as well as in treated sewage discharged into the receiving water body. A total of 148 samples of raw sewage and 114 samples of treated sewage were collected over the research period. The concentration of the total phosphorus in wastewater was determined by spectrometry with ammonium molybdate. The research results were analysed with the aid of advanced statistical analysis using, among others Mann-Kendall test, Kolmogorov Smirnov test, elements of descriptive statistics, as well as regression analysis with selected significance tests. Results and conclusionsBased on the research, it was stated that multidirectional activities implemented both in Poland and Europe with the view to phosphates limitation in detergents have significantly reduced the concentration and load of this nutrient in domestic sewage inflowing to the treatment plant. Over the past 15 years, the total phosphorus concentration in household wastewater has decreased from 14.4 to 5.7 mg • dm -3 , i.e. by 60.4%. The observed tendency corresponds to the decrease in the unit load value per 1 inhabitant. This parameter decreased by 68% from 2.25 mg • person -1 • d -1 in 2003 to 0.72 mg • person -1 • d -1 in 2017. The total phosphorus concentration in treated sewage discharged from the tested sewage treatment plant decreased from 5.1 to 2.0 mg • dm -3 , i.e. by 60.8%, in the years 2003-2017. The observed regression of phosphorus content in the wastewater discharged into the sewage system translates into lowered risk of anthropopressure for flowing waters and the Baltic Sea, mainly in the aspect of initiating the eutrophication process. Based on the research, it was found Kaczor, G. B. (2020). Changes in concentrations and loads of total phosphorus in domestic and treated wastewater over a 15-year observation period in terms of limiting... Acta Sci. Pol., Formatio Circumiectus, 19 (2), 3-14.

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Archives of Environmental Protection

Bugajski¹,

Kurek²,

Jóźwiakowski³

2019

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Efficiency of Nutrient Removal from Household Wastewater in Nonwoven Bioreactors

Cited by 3 publications

References 16 publications

The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

The Effect of Hydraulic Conditions in Barbotage Reactors on Aeration Efficiency

Changes in Concentrations and Loads of Total Phosphorus in Domestic and Treated Wastewater Over a 15-Year Observation Period in Terms of Limiting Negative Anthropopressure on the Quality of Surface Water – Case Study

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