Microbial community characteristics during simultaneous nitrification-denitrification process: effect of COD/TP ratio

Zhang, Jian; Jia, Wenlin; Wang, Rong; Ngo, Huu Hao; Guo, Wenshan; Xie, Huijun; Liang, Shuang

doi:10.1007/s11356-015-5496-1

Cited by 18 publications

(4 citation statements)

References 33 publications

(34 reference statements)

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“…Further, in our study, there was a significant, albeit weak, positive relationship between nosZ abundance and nitrate in the nitrification zones and compartments ( p < 0.01, r 2 = 0.31). Some microorganisms can reduce nitrate even in the presence of relatively high DO concentrations (Robertson and Kuenen, 1984; Zhang et al, 2016). Although we do not know if the microorganisms in this study were actively reducing N 2 O, we do know that they had the genetic capacity to do so and were relatively abundant in the aerated zones.…”

Section: Resultsmentioning

confidence: 99%

Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

et al. 2017

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Biological nitrogen removal (BNR) systems are increasingly used in the United States in both centralized wastewater treatment plants (WWTPs) and decentralized advanced onsite wastewater treatment systems (OWTS) to reduce N discharged in wastewater effluent. However, the potential for BNR systems to be sources of nitrous oxide (N 2 O), a potent greenhouse gas, needs to be evaluated to assess their environmental impact. We quantified and compared N 2 O emissions from BNR systems at a WWTP (Field's Point, Providence, RI) and three types of advanced OWTS (Orenco Advantex AX 20, SeptiTech Series D, and Bio-Microbics MicroFAST) in nine Rhode Island residences (n = 3 per type) using cavity ring-down spectroscopy. We also used quantitative polymerase chain reaction to determine the abundance of genes from nitrifying (amoA) and denitrifying (nosZ) microorganisms that may be producing N 2 O in these systems. Nitrous oxide fluxes ranged from −4 ´ 10 −3 to 3 ´ 10 −1 mmol N 2 O m −2 s −1 and in general followed the order: centralized WWTP > Advantex > SeptiTech > FAST. In contrast, when N 2 O emissions were normalized by population served and area of treatment tanks, all systems had overlapping ranges. In general, the emissions of N 2 O accounted for a small fraction (<1%) of N removed. There was no significant relationship between the abundance of nosZ or amoA genes and N 2 O emissions. This preliminary analysis highlights the need to evaluate N 2 O emissions from wastewater systems as a wider range of technologies are adopted. A better understanding of the mechanisms of N 2 O emissions will also allow us to better manage systems to minimize emissions. Comparison of N 2 O Emissions and Gene Abundances between Wastewater Nitrogen Removal SystemsElizabeth Quinn Brannon,* Serena M. Moseman-Valtierra, Brittany V. Lancellotti, Sara K. Wigginton, Jose A. Amador, James C. McCaughey, and George W. Loomis H umans substantially modify global nitrogen (N) cycles by industrially fixing N for fertilizer and ultimately releasing reactive N back to the environment through various mechanisms, including wastewater treatment. The continued growth of the human population will lead to further increases in excess reactive N, increasing the need for N remediation (Galloway et al., 2003). In recent years, remediation has focused on upgrading centralized wastewater treatment plants (WWTPs) to include biological nitrogen removal (BNR). Since one in five US homes are serviced by conventional onsite wastewater treatment systems (OWTS) (USEPA, 2013) they can also be large sources of N (Zhu et al., 2008;USEPA, 2015). The use of OWTS can be advantageous relative to centralized WWTPs, as they recharge groundwater supplies, require less infrastructure, and have lower energy costs (USEPA, 2013). To ameliorate N inputs to the environment, conventional OWTS are also being upgraded to advanced OWTS that include BNR.Although BNR systems at WWTPs and OWTS vary in design, all employ nitrifying (conversion of ammonium to nitrate) and denitrifying (convers...

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Section: Resultsmentioning

confidence: 99%

Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

et al. 2017

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“…These observations could be an indicator of a lack of coordination between trophic groups during the anaerobic digestion process. These observed differences may be attributed to diverse factors, including substrate characteristics, which could lead to the variability in the structure and function of the microbial population (Zhang et al 2016), as well as to the fact that different substrate ratios (environmental gradients for microbial populations) result in the dynamics of syntrophic populations being highly selective and thus leading to differences in methanogenic activity (Werner et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Anaerobic co-digestion of Opuntia ficus-indica (L.) Mill. cladode with cow manure: Effect of different cultivars on biochemical methane potential

Espinosa-Solares

Aguilar-Toalá

Barrales-Fernández

et al. 2022

J PROF ASSOC CACTUS

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Nopal (Opuntia ficus-indica (L.) Mill.) cladode has garnered great interest recently in the area of agro-energy as emerging biomass due to its sustainable production. The objective of this study was to compare the biochemical methane potential of different nopal cultivars in co-digestion with cow manure. For this purpose, two different nopal cladodes: cow manure proportions (75:25 and 82:18) and three different cultivars (Atlixco, Copena V1, and Milpa Alta) were evaluated. The results indicated that the treatments with higher biochemical methane potential (mL CH4 g-1 VSfed) were Milpa Alta 75:25 (71.4), Copena V1 75:25 (66.5), Milpa Alta 82:18 (64.6), and Copena V1 82:18 (59.0), which showed no statistical difference (P>0.05) between them, whereas the Atlixco treatments (75:25 and 82:18) had the lowest (P<0.05) values (52.8 and 41.5, respectively). The results suggest that the cow manure proportion and nopal cultivar used in a co-digestion system may influence its biochemical methane potential.

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“…These microorganisms favour growth in low COD/TP condition. 29 TP removal efficiencies were decreased in run 100 due to substrate shock (F/M > 1). This was in response to the washout phenomenon and decrease of the MLVSS/MLSS ratio.…”

Section: Phosphorus Removalmentioning

confidence: 99%

Ammonia and phosphorus removal from mixture of treated and raw cattle manure wastewater in a low‐O₂ granular sequencing batch reactor

Matinfar

Mohammadi

Najafpour

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: In this study, the feasibility of an aerobic granular sequencing batch reactor (AGSBR) for elimination of nutrients at low dissolved oxygen (DO) level was investigated. It was fed by a mixture of treated and raw cattle manure wastewater. The behaviour of the AGSBR was assessed at different chemical oxygen demand (COD)/NH 4 + -N ratios, feeding strategies (dump-fill and slow-rate feeding) and hydraulic retention times (24, 32 and 48 h). For a duration of 140 days, the capability of the AGSBR for reducing COD, ammonia and total phosphorus (TP) contents was studied. At DO concentrations of 0.3-1.0 mg L −1 , the effect of different COD/NH 4 + ratios (100:3-100:10) was evaluated. RESULTS:A COD/NH 4 + -N ratio of 100:10 resulted in higher nitrification rate (0.0714 gN gMLVSS −1 day −1 ) compared to a ratio of >100:3 (0.0175 gN gMLVSS −1 day −1 ). The active granular sludge in dump-filling mode revealed better settling properties compared to the slow feeding rate. Microscopic observation of aerobic granules showed that the core of granules was dominantly occupied by filamentous microorganisms. Finally, at optimum conditions, removal efficiencies of NH 4 + -N, TP and COD were 99.9, 99 and 79%, respectively. CONCLUSIONS: Applying the AGSBR at low DO is promising as a cost-effective technique for the secondary treatment of livestock wastewaters. /jctb 60.5% when COD/TP was changed from 54:1 (run 77) to COD/TP of 133:1 (run 82). Besides, TP removal efficiency reached to its maximum level when the steady state occurred in ending runs. This might be due to the full dominance of phosphate-accumulating

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Microbial community characteristics during simultaneous nitrification-denitrification process: effect of COD/TP ratio

Cited by 18 publications

References 33 publications

Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Anaerobic co-digestion of Opuntia ficus-indica (L.) Mill. cladode with cow manure: Effect of different cultivars on biochemical methane potential

Ammonia and phosphorus removal from mixture of treated and raw cattle manure wastewater in a low‐O₂ granular sequencing batch reactor

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Microbial community characteristics during simultaneous nitrification-denitrification process: effect of COD/TP ratio

Cited by 18 publications

References 33 publications

Comparison of N2O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Comparison of N2O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Anaerobic co-digestion of Opuntia ficus-indica (L.) Mill. cladode with cow manure: Effect of different cultivars on biochemical methane potential

Ammonia and phosphorus removal from mixture of treated and raw cattle manure wastewater in a low‐O2 granular sequencing batch reactor

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Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Comparison of N₂O Emissions and Gene Abundances between Wastewater Nitrogen Removal Systems

Ammonia and phosphorus removal from mixture of treated and raw cattle manure wastewater in a low‐O₂ granular sequencing batch reactor