Denitrification in biofilm configured horizontal flow woodchip bioreactor: effect of hydraulic retention time and biomass growth

Damaraju, Sivaramakrishna; Singh, Udita; Sreekanth, D.; Bhandari, Alok

doi:10.1016/j.ecohyd.2014.11.001

Cited by 29 publications

(6 citation statements)

References 31 publications

(13 reference statements)

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“…The denitrification rate increased with the increase of influent nitrate load, which might have been caused by the enhancement of denitrifying bacteria activity, and such results indicated that the system has great potential for the treatment of wastewater with high nitrate concentration. It is reported that a woodchip bioreactor with high NO 3 − -N load increased the denitrification rate in similar systems, which is consistent with the results of this study [47].…”

Section: Resultssupporting

confidence: 92%

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Ying

Yuan

et al. 2019

IJERPH

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The filling ratio (FR) of a carrier has an influence on the pollutant removal of the aerobic moving bed biofilm reactor (MBBR). However, the effect of the polyethylene (PE) carrier FR on the performance and microbial characteristics of the denitrifying MBBR for the treatment of wastewater treatment plant (WWTP) effluent has not been extensively studied. A bench-scale denitrifying MBBR was set up and operated with PE carrier FRs of 20%, 30%, 40%, and 50% for the degradation of chemical oxygen demand (COD) and nitrogen from WWTP effluent at 12 h hydraulic retention time (HRT). The nitrate removal rates with FRs of 20%, 30%, 40%, and 50% were 94.3 ± 3.9%, 87.7 ± 7.3%, 89.7 ± 11.6%, and 94.6 ± 4.0%, and the corresponding denitrification rates (rNO3--N) were 8.0 ± 5.6, 11.3 ± 4.6, 11.6 ± 4.6, and 10.0 ± 4.9 mg NO3−-N/L/d, respectively. Nitrous oxide reductase (nosZ) gene-based terminal restriction fragment length polymorphism (T-RFLP) analysis illustrated that the highest functional diversity (Shannon’s diversity index, H′) of biofilm microbial community was obtained at 30% FR. The quantitative polymerase chain reaction (qPCR) results indicated that the abundance of nitrate reductase (narG) and nosZ genes at 30% FR was significantly higher than that at 20% FR, and no significant changes were observed at 40% and 50% FRs. Thus, 30% FR was recommended as the optimal carrier FR for the denitrifying MBBR.

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Section: Resultssupporting

confidence: 92%

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Ying

Yuan

et al. 2019

IJERPH

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“…Lowering HRT could lead to a decrease in biotransformation due to the availability of less substrate frequently to microorganisms 13 . It has been reported that highering HRT could improve the production performance because more substrate was solubilized and consumed under the longer HRTs 14 . However, it would result in the high cellular toxicity of vanillin and further degradation of vanillin 13 .…”

Section: Resultsmentioning

confidence: 99%

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Yan

Chen

Zhang

et al. 2016

Sci Rep

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We performed the biotransformation of ferulic acid to vanillin using Bacillus subtilis (B. subtilis) in the stirring packed-bed reactors filled with carbon fiber textiles (CFT). Scanning electron microscope (SEM), HPLC, qRT-PCR and ATP assay indicated that vanillin biotransformation is tightly related to cell growth, cellar activity and the extent of biofilm formation. The biotransformation was affected by hydraulic retention time (HRT), temperature, initial pH, stirring speed and ferulic acid concentration, and the maximum vanillin production was obtained at 20 h, 35 °C, 9.0, 200 rpm, 1.5 g/L, respectively. Repeated batch biotransformation performed under this optimized condition showed that the maximum productivity (0.047 g/L/h) and molar yield (60.43%) achieved in immobilized cell system were 1.84 and 3.61 folds higher than those achieved in free cell system. Therefore, the stirring reactor packed with CFT carrier biofilm formed by B. subtilis represented a valid biocatalytic system for the production of vanillin.

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“…The change of HRT also had a great influence on the removal rate of TN. 41 When the HRT was too short, the nitrogen in the sewage and the microorganisms on the biofilm would be sufficiently contacted, which also increased the organic load in the reactor and weakened the stability of the biofilm. 42 However, when the HRT was too long, the amount of organic matter in the reactor would decrease, 39 and the microbial metabolic activity would decrease, which also affected the removal rate of TN.…”

Section: Resultsmentioning

confidence: 99%

Study on COD and nitrogen removal efficiency of domestic sewage by hybrid carrier biofilm reactor

et al. 2021

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Denitrification in biofilm configured horizontal flow woodchip bioreactor: effect of hydraulic retention time and biomass growth

Cited by 29 publications

References 31 publications

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Study on COD and nitrogen removal efficiency of domestic sewage by hybrid carrier biofilm reactor

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