Novel carrier for seafood wastewater treatment using moving bed biofilm reactor system

Phan, Thanh-Long; Pham, Tung Ngoc; Duong, The; Nguyen, Hoang M.

doi:10.4491/eer.2022.508

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…To address this issue, reducing the size of the hydrogel can increase the external surface area, thereby enhancing the probability of contact between the substrate and the carrier per unit volume 14 . In addition, increasing the hydrogel's speci c surface area and porosity can improve the permeability of the substrate into the gel 15 .…”

Section: Introductionmentioning

confidence: 99%

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

Song

Jeong

et al. 2023

Preprint

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Hydrogels immobilizing nitrifying bacteria with different thicknesses of 0.55 and 1.13 cm (HG-0.55 and HG-1.13, respectively) were produced. It was recognized that the thickness of media is a crucial process parameter that affects both the stability and efficiency of wastewater treatment. Batch mode experiments were conducted to quantify specific oxygen uptake rate (SOUR) values at various total ammonium nitrogen (TAN) concentrations and pH levels. In the batch test, HG-0.55 exhibited 2.4 times higher nitrifying activity than HG-1.13, with corresponding SOUR values of 0.00768 and 0.00317 mg-O2/L·mL-PVA·min, respectively. However, HG-0.55 was more susceptible to free ammonia (FA) toxicity than HG-1.13, resulting in a reduction of 80% and 50% in SOUR values for HG-0.55 and − 1.13, respectively, upon increasing the FA concentration from 15.73 to 118.12 mg-FA/L. Continuous mode experiments were conducted to assess the partial nitritation (PN) strategy's efficiency in practical applications, where continuous wastewater inflow maintains low FA toxicity through high ammonia-oxidizing rates. With step-wise TAN concentration increases, HG-0.55 experienced a gentler increase in FA concentration compared to HG-1.13. At a nitrogen loading rate of 0.78–0.95 kg-N/m3·day, the FA increase rate for HG-0.55 was 0.0179 kg-FA/m3·day, while that of HG-1.13 was 0.0516 kg-FA/m3·day. Despite its sensitivity to FA toxicity, the thinner HG-0.55 can enhance PN performance owing to its higher ammonia-oxidizing activity. FA susceptibility depends on hydrogel thickness in batch and continuous modes, with continuous mode favoring thin gel with high ammonia-oxidizing activity due to the decrease in FA accumulation.

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Section: Introductionmentioning

confidence: 99%

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

Song

Jeong

et al. 2023

Preprint

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“…Some carriers like the polyurethane sponge cube are made of porous foam and belong to plastic variants [19]. [20] performed an experiment using a hybrid-structure novel carrier. Meanwhile, [21] investigated the surface properties, influences of shape, size, and materials, and performance of carriers.…”

Section: Introductionmentioning

confidence: 99%

Development of Warp Knitted-Based Filtration Media

Lenfeldová,

Ryvolová,

Kdýrová

2023

Preprint

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Biological wastewater treatment based on the removal of various nitrogen forms using activated sludge is a highly efficient and economical method with environmental benefits. The activated sludge comprises bacteria that form colonies on solid carriers (e.g., the most commonly used carrier, AnoxKaldnes). The initial concept behind designing a warp knitted fabric structure (i.e., spacer fabric) with holes is based on the appearance similarity of a three-dimensional fabric and a solid carrier, focusing on potential industrial production. In this study, the longitudinal textile properties of multi- and monofilament materials are measured. A structural analysis is conducted to produce samples unraveled and separated by mono and multifilaments. Density, weight, loop length, filament consumption, specific surface area, and effective area are calculated. Through a basic experiment in a laboratory nitrification reactor, a biofilm is formed on the carriers. The analysis results of the O2 consumption rate of individual design variants reveals minimal differences after 6 and 14 weeks. The efficient carrier area on the outer and inner front and back sides of four developed carrier variants is measured after cutting the monofilaments with the image analysis support. This study might be helpful in designing other textile-based carriers. The warp knitted carrier presented herein demonstrates the capture and presence of an active biofilm evidenced by a higher oxygen consumption rate of up to 8 mg/L/h in 6 weeks. It also shows the benefit of commercially available warp knitted carrier manufacturing.

show abstract

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

Song

Jeong

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Hydrogels immobilizing nitrifying bacteria with different thicknesses of 0.55 and 1.13 cm (HG-0.55 and HG-1.13, respectively) were produced. It was recognized that the thickness of media is a crucial parameter that affects both the stability and efficiency of wastewater treatment. Batch mode experiments were conducted to quantify specific oxygen uptake rate (SOUR) values at various total ammonium nitrogen (TAN) concentrations and pH levels. In the batch test, HG-0.55 exhibited 2.4 times higher nitrifying activity than HG-1.13, with corresponding SOUR values of 0.00768 and 0.00317 mg-O2/L mL-PVA min, respectively. However, HG-0.55 was more susceptible to free ammonia (FA) toxicity than HG-1.13, resulting in a reduction of 80% and 50% in SOUR values for HG-0.55 and -1.13, respectively, upon increasing the FA concentration from 15.73 to 118.12 mg-FA/L. Continuous mode experiments were conducted to assess the partial nitritation (PN) efficiency in practical applications, where continuous wastewater inflow maintains low FA toxicity through high ammonia-oxidizing rates. With step-wise TAN concentration increases, HG-0.55 experienced a gentler increase in FA concentration compared to HG-1.13. At a nitrogen loading rate of 0.78–0.95 kg-N/m3 day, the FA increase rate for HG-0.55 was 0.0179 kg-FA/m3 day, while that of HG-1.13 was 0.0516 kg-FA/m3 day. In the batch mode, where wastewater is introduced all at once, the high accumulation of FA posed a disadvantage for the FA-susceptible HG-0.55, which made it unsuitable for application. However, in the continuous mode, the thinner HG-0.55, with its larger surface area and high ammonia oxidation activity, proved to be suitable and demonstrated its effectiveness. This study provides valuable insights and a framework for the utilization strategy of immobilized gels in addressing the toxic effects of FA in practical processes.

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Novel carrier for seafood wastewater treatment using moving bed biofilm reactor system

Cited by 3 publications

References 58 publications

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

Development of Warp Knitted-Based Filtration Media

Thickness of hydrogel for nitrifying biomass entrapment determines the free ammonia susceptibility differently in batch and continuous modes

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