Evaluation of increased denitrification in an anoxic activated sludge using zeolite

Park, Se Jin; Kim, Chang Gyun; Tae-Il, Yoon; Kim, Wook; Dong, Yong Hyun; Gu, Nam

doi:10.1007/bf02705554

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…Sidibe [30] had also explored biochar (generated from Salix leaves) along with pine bark and activated charcoal as filter materials for the treatment of greywater for subsequent reuse in agriculture. Likewise, zeolite has also been used as biofilter media in many studies for nitrate removal from surface water [31], ammonia and suspended solids removal using aerated filter from textile wastewater [32], nitrogen removal from high-strength wastewater generated from fertilizer and tannery industries [33], and for denitrification in an anoxic activated sludge [34]. Thus, both biochar and zeolite have been explored for the removal of diverse contaminants from various types of wastewater.…”

Section: Introductionmentioning

confidence: 99%

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Paul

Hall

2021

Water

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Denitrification processes are crucial in aquaculture as they convert the undesirable nitrate to safer forms of nitrogen. Conventionally, plastic media are used for the biofiltration of wastewater. However, alternative media may be as effective/better than plastic and enhance the sustainability of the system. This study evaluated biochar and zeolite as alternatives for the denitrification of aquaculture effluents. Triplicates of laboratory-scale bioreactors were fabricated to compare the denitrification efficiencies of biochar and zeolite to that of plastic. The bioreactors were fed synthetic aquaculture wastewater having nitrate loading rates of 50, 125, and 150 mg/L. Zeolite exhibited highest values of surface roughness in terms of arithmetic mean height (0.89 µm), maximum height (6.52 µm), and root-mean-square height (1.17 µm), as corroborated by surface profilometry and scanning electron microscopy. The results revealed that under pseudo-steady-state conditions, zeolite displayed the highest nitrate removal efficiency (maximum 95.02 ± 0.01%), which was followed by biochar and plastic (maximum 92.91 ± 0.01% and 92.57 ± 0.02%, respectively) due to its extraordinary surface roughness that provided better adhesion to the bacteria. However, by the end of the study, all the media exhibited comparable rates. Thus, both zeolite and biochar are sustainable alternatives of biomedia for nitrate removal. However, time and labor constraints must be accounted for to scale-up such bioreactors.

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Section: Introductionmentioning

confidence: 99%

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Paul

Hall

2021

Water

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“…The bacterial cells that interacted with clinoptilolite particles obviously enabled efficient nitrate removal. In addition, a similar observation has been demonstrated and the addition of zeolite improved the performance of the denitrification process [33].…”

Section: The Denitrification In Continuous-flow Stirred Reactormentioning

confidence: 66%

“…Amongst diverse biological and physical-chemical methods, biological denitrification, chemical reduction or physical adsorption have been studied, but effective nitrate removal is still under consideration. The zeolite according to its high ion exchange abilities, molecular sieve properties, ease of availability and special importance in many water purification processes is widely used for removal of detrimental chemicals from both ground and surface waters and it has been proven that the addition of zeolite improves the performance of the denitrification process [33]. Therefore, in this study, the denitrification of the SW with NPC as a support material for bacterial growth in the batch and continuous-flow reactor was investigated.…”

Section: Resultsmentioning

confidence: 97%

Continuous-flow biological denitrification with zeolite as support for bacterial growth

Foglar

Gašparac²

2013

Desalination and Water Treatment

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A B S T R A C TZeolite particles with bacterial culture (Bio-NPC) were used for nitrate removal from surface water (SW) and effects of Bio-NPC, and the methanol amount and the pH value of SW were investigated in the batch reactor and the process was then monitored in the continuous-flow stirred reactor. The application of Bio-NPC particles (10% w/w) in the batch reactor was efficient for the removal of 100 mg NO 3 -N/L from the SW, and the addition of methanol was optimal at CH 3 OH/N ratio of 2.5:1. The process was stable in the pH range of 5.85-8.03, but the highest denitrification rate was obtained at the pH value of 7.13. In the continuous-flow stirred reactor, nitrate removal was investigated at different hydraulic retention times (HRTs) (37.04, 23.26, 10.53, 2.33 and 1.32 h) and the efficient nitrate removal was achieved even at HRT of 1.32 h with nitrate and organic removal higher than 99 and 79%, respectively. The volumetric denitrification rates during the first eight days of continuous flow were in the range of 39.2-51.28 mg NO 3 -N/L h and then it fluctuated within the range of 63.47-79.90 mg NO 3 -N/L h. The use of Bio-NPC was demonstrated as an efficient method for complete nitrate removal from the surface water.

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The feasibility of using spent sulfidic caustic as alternative sulfur and alkalinity sources in autotrophic denitrification

Byun

Jung

et al. 2005

Korean J. Chem. Eng.

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Evaluation of increased denitrification in an anoxic activated sludge using zeolite

Cited by 7 publications

References 7 publications

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Continuous-flow biological denitrification with zeolite as support for bacterial growth

The feasibility of using spent sulfidic caustic as alternative sulfur and alkalinity sources in autotrophic denitrification

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