Nitrogen removal in moving bed sequencing batch reactor using polyurethane foam cubes of various sizes as carrier materials

Lim, Jun-Wei; Seng, Chye‐Eng; Lim, Poh‐Eng; Ng, Si-Ling; Sujari, Amat-Ngilmi Ahmad

doi:10.1016/j.biortech.2011.08.014

Cited by 61 publications

(36 citation statements)

References 24 publications

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“…Determining PU foam surface area, Lim et al have measured foam pores by means of images obtained from scanning microscopy, but in their calculations they have adopted the methodology proposed by Rhodes assuming that all pores have the same dimension and are spherical inside and hemispherical on the carrier outer surfaces. However, in the process of expanding PU sponges, a structure in the form of a reticulated foam develops edge struts of which form open, penta‐, as well as hexa‐ and quadrilateral flat pores or windows, composing thus adjoining three‐dimensional cells.…”

Section: Resultsmentioning

confidence: 99%

“…The reaction rate observed in the experiment decreased with decreasing foam porosity. Lim et al observed a decrease in the reaction rate ( r ) with increasing SBR fill fraction, from 20 mg/L min where the volume of carriers comprised 20% of the working volume of the reactor to 15.7 mg/L min in the reactor filled with 40%. The decrease of r could be explained by a decrease of the specific external surface area (calculated on reactor volume).…”

Section: Resultsmentioning

confidence: 99%

“…Research aimed at increasing nitrification efficiency was also carried out with the use of combined methods – active sludge with a biological membrane developing on the fill (movable or immovable carriers) . Different biomass carriers are currently available, such as Kaldnes (polyethylene media), Liapor (ceramic media), Linpor (plastic media with high porosity), and polyurethane (PU) foam cubes . Lim et al report that suspended biomass plays an important role in N‐NH 4 + oxidation, as the biomass colonizing inner surfaces of PU foam is used as a carbon source in the denitrification process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Koc-Jurczyk

Jurczyk

2016

CLEAN Soil Air Water

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Application of sequencing batch reactors (SBR) for treatment of leachate from old, stabilized landfills, could be still an economically viable solution, as far as nitrogen removal is concerned. Very low amounts of accesible organic compounds requires an unconventional approach to treatment technology. In this paper the authors proposed utilisation of polyurethane (PU) foam of various porosity as a biomass carrier, hydraulic retention time (HRT) extended to 2 days and temperature elevated to 37°C, to stimulate simultaneous nitrification and denitrification (SND). The porosity of PU carriers had no effect on the efficiency of organic compounds removal, whilst the ammonium nitrogen (N-NH 4 þ ) removal efficiency was highest in the reactor (SBR2) equipped with PU cuboidshape carriers of 30 pores per inch (ppi), reaching 77.6%. In the reactor SBR3 filled with 15 ppi foam, the N-NH 4 þ removal efficiency was much lower (54.2%), but still better than observed in reference reactor, SBR1, operated with suspended activated sludge only (46.3%). The average free ammonia concentration in the effluents ranged from 140.18 to 347.98 mg/L at pH 9.6, depending on the reactor. Neither nitrites nor nitrates were found in the effluents, and the kinetics of N-NH 4 þ removal proceeded according to the first-order reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Koc-Jurczyk

Jurczyk

2016

CLEAN Soil Air Water

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“…For comparison, the average masses of the cells in 5 mL of cell solution(OD 600 =0.5) and those in EBs were also investigated and found to be (1.92±0.55) and (0.59±0.12) mg, respectively, according to the biomass estimation method [27,28] . The pH of the medium was adjusted by adding 5% HCl or NaOH solution.…”

Section: Quinoline Degradationmentioning

confidence: 99%

Novel porous polyethersulfone beads as matrix to immobilize Comamonas testosteroni sp. bdq06 in quinoline biodegradation

Geng

Zhu

et al. 2015

Chem. Res. Chin. Univ.

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Novel matrix beads for the immobilization of strain Comamonas testosteroni sp. bdq06 to degrade quinoline were fabricated from polyethersulfone(PES). The beads have an average size of 3 mm and a surface dense layer of 20 microns. To help adhesion and proliferation of bacterial cells, the surfaces of the PES beads were etched, and numerous holes about 1.5 micrometers in diameter were generated as tunnels for cell colonizing in the larger internal cavities of about 5 micrometers in diameter. The quinoline degradation was remarkably enhanced by the cells immobilized in PES beads compared with that by the free cells at pH 5.0 or 10.0 and a temperature of 40 °C. The enhanced degradation of quinoline was contributed to the biofilm on the surface of PES beads, resulting in the significant reduction of retention time from 9 h to 2 h. Furthermore, the beads remain intact after the ultrasonic treatment of them for 30 min or recycling 50 times, indicating that they have excellent mechanical strength, flexibility and swelling capacity. Thus, PES beads have great potential to be matrix for the cell immobilization in bioaugmentation.

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“…One of the ways of retaining biomass in reactors and providing anaerobic and aerobic conditions is to use biomass carriers. Various media, such as Kaldnes (polyethylene media), Liapor (ceramic media) and Linpor (plastic media with a high porosity), or polyurethane (PU) foam cubes (Lim et al 2011) can be used as biomass carriers. When waste is treated in the reactors with biomass carriers, the amount thereof is vital.…”

Section: Introductionmentioning

confidence: 99%

Effect of Technological Conditions on Removing Organic Substances from Landfill Leachates

2018

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The paper presents the research on how the effectiveness of removing organic substances is affected by the use of polyurethane foam fillings characterized by a varied porosity and the temperature of the process of treating landfill leachate in a biological sequencing batch reactor. The information on the conversion of organic compounds during the operation of the reactor was obtained by measuring the absorbance for selected wavelengths to describe the process of humification. It was found that the technological conditions used in the experiment affected the effectiveness of reducing the COD, but did not affect the type or amount of the humic substances in the leachate treated. In all of the variants examined, the COD decreased the as the humification level increased, and yet this relation was not linear in character.

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Nitrogen removal in moving bed sequencing batch reactor using polyurethane foam cubes of various sizes as carrier materials

Cited by 61 publications

References 24 publications

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Biological Treatment of Landfill Leachate at Elevated Temperature in the Presence of Polyurethane Foam of Various Porosity

Novel porous polyethersulfone beads as matrix to immobilize Comamonas testosteroni sp. bdq06 in quinoline biodegradation

Effect of Technological Conditions on Removing Organic Substances from Landfill Leachates

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