Impact of solids retention time on dissolved organic nitrogen and its biodegradability in treated wastewater

Simsek, Halis; Kasi, Murthy; Ohm, Jae‐Bom; Murthy, Sudhir; Khan, Eakalak

doi:10.1016/j.watres.2016.01.041

Cited by 42 publications

(18 citation statements)

References 25 publications

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“…However, the SRT of 8.2 d (aerobic SRT of 5.1 d) used to operate the high F:M reactors is common in activated sludge processes performing complete nitrification [28,67], and well above the operating SRT of 5-6 d at the full-scale plant that provided the sludge inoculum for this study. SRT values of 4-8 d have been suggested as optimum for nitrification in practice [67,68], while complete nitrification has been reported for SRT values as low as 2 d [69]. Thus, our observed changes in nitrifiers and nitrification function were driven by controlled changes in F:M and C:N values and not by washout of NOB due to a low SRT.…”

Section: /12supporting

confidence: 49%

“…The C:N values in this study were not controlled. This seems to be common practice as several recent studies, using sludge bioreactors to test the effect of varying SRT on nitrification and nitrifiers, neither controlled covariations in F:M nor accounted for changing C:N values [69,[72][73][74]. One of the studies, however, highlighted the importance of F:M covariations with SRT for assessing P removal [72].…”

Section: Importance Of Assessing F:m C:n and Srt Simultaneously For mentioning

confidence: 99%

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Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Santillan

Phua

Constancias

et al. 2019

Preprint

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15Sustained perturbations are relevant for environmental biotechnology as they can lead systems to 16 alternative stable states that may not be reversible. Studies assessing these concerns are scarce as 17 robust replication is required. Here, we tested the effect of sustained organic loading variations (food-18 to-biomass ratio, F:M; carbon-to-nitrogen ratio, C:N) on both structure and function of activated 19 sludge bacterial communities, focusing on nitrification and nitrifiers. Two sets of replicate 5-liter 20 sequencing batch reactors were operated at two different, low (n=4) and high (n=3), F:M (0.19-0.36 21 mgCOD/mgTSS/d) and C:N (3.5-6.3 mgCOD/mgTKN) conditions for a period of 74 days, following 22 53 days of sludge acclimation. The inoculum was taken from a full-scale treatment plant. Resilience 23 was tested during the last 14 days by operating all seven reactors at low F:M-C:N. Samples were 24 analyzed using metagenomics, 16S rRNA gene amplicon sequencing, and effluent characterization. 25

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Section: /12supporting

confidence: 49%

Section: Importance Of Assessing F:m C:n and Srt Simultaneously For mentioning

confidence: 99%

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Santillan

Phua

Constancias

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…In fact, findings about longer SRTs contributing to less amounts of DON have been reported in municipal biological nutrient removal (BNR) WWTPs (Sattayatewa et al, 2010). Interestingly, recent research conducted by Simsek et al (2016) Fig. 2).…”

Section: Chemical Analysismentioning

confidence: 93%

Removal characteristics of DON in pharmaceutical wastewater and its influence on the N-nitrosodimethylamine formation potential and acute toxicity of DOM

Jiang

et al. 2017

Water Research

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Previous research has focused on dissolved organic carbon (DOC) as a surrogate for dissolved organic matter (DOM) in pharmaceutical wastewater. Dissolved organic nitrogen (DON) as a part of DOM has received little attention. This study investigated the removal characteristics of DON and its influence on the N-nitrosodimethylamine formation potential (NDMA FP) and acute toxicity of DOM in a full-scale hydrolysis/acidification + anaerobic/anoxic/aerobic + moving bed biofilm reactor (MBBR) process treating pharmaceutical wastewater. Results showed that maximum removal of DON (68 ± 12%) was present in the anaerobic process. The removal of DON by anoxic and aerobic processes was negligible as a result of the production of new N-containing compounds that are characteristic of proteins/amino sugars and lipids. DON concentration decreased significantly in the MBBR process (p < 0.05, t-test), indicating that manipulation of the solids retention times (SRTs) could be a solution to minimize DON. Based on the Pearson correlation analysis, the behavior of NDMA FP and DOM acute toxicity was significantly associated with the 3 kDa < MW < 10 kDa (r = 0.709, p < 0.05) and MW < 3 kDa DON (r = 0.659, p < 0.05), respectively, and are not identical to that of DOC fractions (r = 0.037-0.466, p = 0.051-0.886). Moreover, the removal and molecular changes of DON are not coupled with that of DOC during biotreatment. Thus, testing the performance indicator of DON in pharmaceutical wastewater was recommended, as it provides important information for DOM removal characteristics.

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“…3, reaction 8) in the so called ammonification or mineralization reactions (Simsek et al, 2016). Thereafter, the NH 4 + generated can be removed from surface water as above described.…”

Section: Nitrogen Removal Pathwaysmentioning

confidence: 99%

Advanced nutrient removal from surface water by a consortium of attached microalgae and bacteria: A review

Liu

et al. 2017

Bioresource Technology

270

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Impact of solids retention time on dissolved organic nitrogen and its biodegradability in treated wastewater

Cited by 42 publications

References 25 publications

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Sustained organic loading disturbance favors nitrite accumulation in bioreactors with variable resistance, recovery and resilience of nitrification and nitrifiers

Removal characteristics of DON in pharmaceutical wastewater and its influence on the N-nitrosodimethylamine formation potential and acute toxicity of DOM

Advanced nutrient removal from surface water by a consortium of attached microalgae and bacteria: A review

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