A review: Driving factors and regulation strategies of microbial community structure and dynamics in wastewater treatment systems

Chen, Yangwu; Lan, Shuhuan; Wang, Longhui; Dong, Shiyang; Zhou, Houzhen; Tan, Zhouliang; Li, Xudong

doi:10.1016/j.chemosphere.2017.01.129

Cited by 131 publications

(43 citation statements)

References 105 publications

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“…Free-floating spherical biofilms, so called granules, combine many of the properties of these two growth modes [19,20], which has gained increasing interest and implementation in recent years [21]. The possibility to remove carbon, nitrogen and phosphorous simultaneously is one of the most important attributes of granular sludge, which renders highly compact and less energy demanding wastewater treatment [22].…”

Section: Introductionmentioning

confidence: 99%

“…The microbial communities in wastewater treatment are either assembled as flocs in activated sludge or as biofilms on different substrata. Free-floating spherical biofilms, so called granules, combine many of the properties of these two growth modes (Ferrera & Sánchez, 2016, Chen et al, 2017, which has gained increasing interest and implementation in recent years . The possibility to remove carbon, nitrogen and phosphorous simultaneously is one of the most important attributes of granular sludge, which renders highly compact and less energy demanding wastewater treatment (Bengtsson et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Influence of deterministic and stochastic processes on microbial community assembly during aerobic granulation

Liébana

Szabo

Persson

et al. 2018

Preprint

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Aerobic granular sludge is an energy efficient and compact biofilm process for wastewater treatment which has received much attention during the last decades and is now being implemented in full-scale. However, the factors involved in microbial community assembly during formation of granules are poorly understood and little is known about the reproducibility in treatment performance and community structure. Here we show that both deterministic and stochastic factors exert a dynamic influence during microbial community assembly into granular sludge. During granulation, the microbial communities in three replicate sequencing batch reactors followed similar successional trajectories of the most abundant taxa and showed similar dynamics in diversity. Deterministic factors dominated the assembly of the most abundant community members as the microbial community transitioned from floccular to granular form. Stochastic factors mostly affected rare members of the communities and caused the microbial community structure to diverge in one of the reactors; however, this did not have an impact on the treatment performance. This demonstrates that the reactor function and the dynamics of the most abundant community members are in fact reproducible during the formation of aerobic granules.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of deterministic and stochastic processes on microbial community assembly during aerobic granulation

Liébana

Szabo

Persson

et al. 2018

Preprint

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“…The microbial community structure of a denitrifying reactor can change with different influent composition, process configuration and operating parameters . Thus assessing of microbial community composition and diversity in a biological wastewater treatment process is very useful in explaining the complex microbial interactions and substrate utilization .…”

Section: Introductionmentioning

confidence: 99%

Impact of hydraulic retention time and current on the microbial community and denitrification genes in a continuous‐flow biofilm electrode reactor

Zhai

Pavlostathis

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: A biofilm-electrode reactor (BER) was developed on the basis of hydrogenotrophic denitrification. The BER can be strengthened by adding organic matter, and the nitrate removal will be enhanced by a combination of heterotrophic and autotrophic denitrification. Denitrification in a biological system can be affected by operating parameters, and the microbial community and functional genes can be changed at the same time. In this study, the effect of hydraulic retention time (HRT) and current on the denitrification of a low chemical oxygen demand to nitrogen ratio (COD/N), saline wastewater in a continuous-flow BER was evaluated and compared to a conventional biofilm reactor (BR). RESULTS:The highest extent of nitrate removal was obtained at the optimum HRT (8 h) and current (10 mA). Low levels of ammonia (0.5-4 mg L −1 ), produced through dissimilatory nitrate reduction to ammonia (DNRA), were observed. Quantitative real-time polymerase chain reaction analysis revealed that the proportion of nirS-type denitrifiers (3.75-8.30%) exceeded nirK-type denitrifiers (0.24-0.90%) in both BR and BER. The genera of T78, Paracoccus and Azoarcus were identified as the dominant denitrifying bacteria in the BER. The cooperative activity of nitrate, nitrite and nitrous oxide reductase is necessary to reduce nitrate to dinitrogen in the denitrification process. The highest ratio of nosZ/nir genes in the bacterial community was 0.25 when the applied current was 10 mA. CONCLUSION: Compared to other denitrification reactors, the BER is more effective to treat low-COD/N, saline wastewater with short HRT and low current. RESULTS AND DISCUSSION Effect of HRT on denitrification performanceThe denitrification performance of BR and BER was investigated at five HRTs, decreasing from 16 to 12, 8, 4 and 2 h. The variation J Chem Technol Biotechnol 2019; 94: 933-941

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“…um fator preocupante a partir do fim do século XX, gerando diversos acordos a nível internacional, normas e diretrizes, ressaltando a possível escassez de recursos ambientais devido à poluição(PEARSON, 2011). Um dos quesitos de Neste método, podem ser utilizados microrganismos do próprio meio operacional, selecionados e reaclimatados em laboratório e reintroduzidos para manter as taxas de crescimento de sua cultura e também a degradação; ou modificados geneticamente; ou microrganismos externos ao meio; ou também através da adição de substratos(CHEN et al, 2017; HERRERO e STUCKEY, 2015; TANG e CHEN, 2015). Essa escolha, no entanto, deve ser feita com o devido cuidado, já que em sistemas biológicos, podem ocorrer competição ou predatismo entre as espécies inoculadas e as espécies já presentes, presença de bacteriófagos (já que na maioria dos bioaumentadores se utiliza de culturas de bactérias) ou a dificuldade de adaptação ao processo em condições operacionais nas ETEs(NZILA et al, 2016; HERRERO e STUCKEY, 2015).…”

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Produção De Biosurfactantes Utilizando Como Substrato Resíduos Do Refino Do Processamento De Oleaginosas – Uma Revisão

Silva¹,

Almeida²,

Vieira³

et al. 2019

Ciência, Tecnologia E Inovação: Desafio Para Um Mundo Global

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A review: Driving factors and regulation strategies of microbial community structure and dynamics in wastewater treatment systems

Cited by 131 publications

References 105 publications

Influence of deterministic and stochastic processes on microbial community assembly during aerobic granulation

Influence of deterministic and stochastic processes on microbial community assembly during aerobic granulation

Impact of hydraulic retention time and current on the microbial community and denitrification genes in a continuous‐flow biofilm electrode reactor

Produção De Biosurfactantes Utilizando Como Substrato Resíduos Do Refino Do Processamento De Oleaginosas – Uma Revisão

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