scholarly journals Nitrate Removal and Dynamics of Microbial Community of A Hydrogen-Based Membrane Biofilm Reactor at Diverse Nitrate Loadings and Distances from Hydrogen Supply End

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3196
Author(s):  
Minmin Jiang ◽  
Yuanyuan Zhang ◽  
Yuhang Yuan ◽  
Yuchao Chen ◽  
Hua Lin ◽  
...  
Keyword(s):  
Microbial Community ◽  
High Throughput Sequencing ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Back Diffusion ◽  
Membrane Biofilm Reactor ◽  
Functional Bacteria ◽  
Hydrogen Supply ◽  
N Metabolism ◽  
The Impact

The back-diffusion of inactive gases severely inhibits the hydrogen (H2) delivery rate of the close-end operated hydrogen-based membrane biofilm reactor (H2-based MBfR). Nevertheless, less is known about the response of microbial communities in H2-based MBfR to the impact of the gases’ back-diffusion. In this research, the denitrification performance and microbial dynamics were studied in a H2-based MBfR operated at close-end mode with a fixed H2 pressure of 0.04 MPa and fed with nitrate (NO3−) containing influent. Results of single-factor and microsensor measurement experiments indicate that the H2 availability was the decisive factor that limits NO3− removal at the influent NO3− concentration of 30 mg N/L. High-throughput sequencing results revealed that (1) the increase of NO3− loading from 10 to 20–30 mg N/L resulted in the shift of dominant functional bacteria from Dechloromonas to Hydrogenophaga in the biofilm; (2) excessive NO3− loading led to the declined relative abundance of Hydrogenophaga and basic metabolic pathways as well as counts of most denitrifying enzyme genes; and (3) in most cases, the decreased quantity of N metabolism-related functional bacteria and genes with increasing distance from the H2 supply end corroborates that the microbial community structure in H2-based MBfR was significantly impacted by the gases’ back-diffusion.

scholarly journals Methane-supported nitrate removal from groundwater in a membrane biofilm reactor

2018 ◽  
Vol 132 ◽  
pp. 71-78 ◽  
Author(s):  
Jing-Huan Luo ◽  
Hui Chen ◽  
Zhiguo Yuan ◽  
Jianhua Guo
Keyword(s):  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Membrane Biofilm Reactor

Total electron acceptor loading and composition affect hexavalent uranium reduction and microbial community structure in a membrane biofilm reactor

2017 ◽  
Vol 125 ◽  
pp. 341-349 ◽  
Author(s):  
Aura Ontiveros-Valencia ◽  
Chen Zhou ◽  
Zehra Esra Ilhan ◽  
Louis Cornette de Saint Cyr ◽  
Rosa Krajmalnik-Brown ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Electron Acceptor ◽  
Microbial Community Structure ◽  
Biofilm Reactor ◽  
Uranium Reduction ◽  
Total Electron ◽  
Hexavalent Uranium ◽  
Membrane Biofilm Reactor

Microbial community structure during nitrate and perchlorate reduction in ion-exchange brine using the hydrogen-based membrane biofilm reactor (MBfR)

2010 ◽  
Vol 101 (10) ◽  
pp. 3747-3750 ◽  
Author(s):  
Steven W. Van Ginkel ◽  
Regina Lamendella ◽  
William P. Kovacik Jr. ◽  
Jorge W. Santo Domingo ◽  
Bruce E. Rittmann
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Ion Exchange ◽  
Microbial Community Structure ◽  
Biofilm Reactor ◽  
Perchlorate Reduction ◽  
Membrane Biofilm Reactor

Effect of NaCl on nitrate removal from ion-exchange spent brine in the membrane biofilm reactor (MBfR)

2012 ◽  
Vol 65 (1) ◽  
pp. 100-104 ◽  
Author(s):  
Steven W. Van Ginkel ◽  
Bi-o Kim ◽  
Ziming Yang ◽  
Robby Sittmann ◽  
Mark Sholin ◽  
...  
Keyword(s):  
Citric Acid ◽  
Ion Exchange ◽  
Membrane Fouling ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Reactor Operation ◽  
High Sodium ◽  
Loading Rates ◽  
Osmotic Tolerance ◽  
Membrane Biofilm Reactor

The H2-based membrane biofilm reactor was used to remove nitrate from synthetic ion-exchange brine at NaCl concentrations from ∼3 to 30 g/L. NaCl concentrations below 20 g/L did not affect the nitrate removal flux as long as potassium was available to generate osmotic tolerance for high sodium, the H2 pressure was adequate, and membrane fouling was eliminated. Operating pHs of 7–8 and periodic citric acid washes controlled membrane fouling and enabled reactor operation for 650 days. At 30 psig H2 and high nitrate loading rates of 15 to 80 g/m2 d, nitrate removal fluxes ranged from 2.5 to ∼6 g/m2 d, which are the highest fluxes observed when treating 30 g/L IX brine. However, percent removals were low, and the H2 pressure probably limited the removal flux.

Comparing heterotrophic and hydrogen-based autotrophic denitrification reactors for effluent water quality and post-treatment

2012 ◽  
Vol 12 (2) ◽  
pp. 227-233 ◽  
Author(s):  
Youneng Tang ◽  
Michal Ziv-El ◽  
Kerry Meyer ◽  
Chen Zhou ◽  
Jung Hun Shin ◽  
...  
Keyword(s):  
Water Quality ◽  
Packed Bed ◽  
Pilot Scale ◽  
Post Treatment ◽  
Biofilm Reactor ◽  
Effluent Water ◽  
Membrane Biofilm Reactor ◽  
Plate Counts ◽  
Biodegradable Dissolved Organic Carbon ◽  
The Impact

This work compares a pilot-scale H2-based membrane biofilm reactor (MBfR) and a pilot-scale packed-bed heterotrophic reactor (PBHR) for denitrification of nitrate-contaminated groundwater. The comparison includes the effluent water quality of the denitrification reactors (NO3−, NO2−, dissolved oxygen, SO42−, (biodegradable) dissolved organic carbon, heterotrophic plate counts (HPC), turbidity, NH4+, and pH), and the impact of post-treatment on water quality. At the same nitrate carrier-surface loading, effluent water quality was generally better directly from the MBfR than from the PBHR. However, post treatment including an ozone-contact tank and a post-filter brought the finished-water quality for both systems to roughly the same level, which met all drinking water standards except for HPC.

scholarly journals Mangrove plants improve predominant microbiota in constructed wetlands for wastewater treatment

2020 ◽  
Author(s):  
Zhiteng Chen ◽  
Ruili Li ◽  
Nora Fung Yee Tam ◽  
Shuguang Xie ◽  
Qijie Zan
Keyword(s):  
Wastewater Treatment ◽  
Community Structure ◽  
Microbial Community ◽  
Constructed Wetlands ◽  
High Throughput Sequencing ◽  
Kandelia Candel ◽  
Treatment Results ◽  
Wastewater Purification ◽  
Mangrove Plants ◽  
The Impact

Abstract Background Two wetlands planted with Kandelia candel and Aegiceras corniculatum and one wetland without plantation were constructed for stable wastewater treatment since 2005. The impact of mangrove plants on the microbiota of wetlands was studied due to their higher efficiency of wastewater treatment. Results Microbiota of each wetland were explored through high-throughput sequencing and their relationships were predicted based on spearman metrics. Planted wetlands had higher microbial diversities and more similar microbial communities. Five phyla were significantly enriched in planted wetlands, including Acidobacteria, Nitrospirae, Actinobacteria, Gemmatimonadetes and Elusimicrobia. Twelve phyla of other microbes accounting for 1.85% of the total relative abundance showed significantly higher abundance in the unplanted wetland. Planted wetlands shared more similar microbial community structure distinguished from that of the unplanted one. Additionally, distinct microbial interactive pattern could be observed in planted wetlands. Conclusions Based on their microbial compositions and interactive patterns, it will be reasonable to illustrate the higher wastewater purification ability of planted wetlands. Research here also supplies useful information for the potential of applicable combination of certain kinds of microbes for wastewater treatment.

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