Simultaneously advanced removal of nitrogen and phosphorus in a biofilter packed with ZVI/PHBV/sawdust composite: Deciphering the succession of dominant bacteria and keystone species

Zhou, Qi; Sun, Haimeng; Jia, Lixia; Wu, Wei‐Zhong

doi:10.1016/j.biortech.2022.126724

Cited by 39 publications

(13 citation statements)

References 49 publications

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“…Then, samples were filtered through a 0.45 μm microfiltration membrane (PES, Jinteng, Tianjin, China) for further analysis. NO 3 – –N, NO 2 – –N, NH 4 + –N, total nitrogen (TN), total phosphorus (TP), SO 4 2– , dissolved organic carbon (DOC), and total iron concentrations were analyzed as previously described. , The gas-phase composition (CO 2 , N 2 O, and CH 4 ) was determined bimonthly using Agilent 6890N and 7890N gas chromatographs (Agilent Technologies, Santa Clara, CA). The composite surface morphology before and after bacterial attachment was characterized by scanning electron microscopy (SEM) (Quanta FEG 450, FEI, USGS, VA).…”

Section: Materials and Methodsmentioning

confidence: 99%

Significantly Enhanced Nitrate and Phosphorus Removal by Pyrite/Sawdust Composite-Driven Mixotrophic Denitrification with Boosted Electron Transfer: Comprehensive Evaluation of Water–Gas–Biofilm Phases during a Long-Term Study

Zhou,

Jia,

et al. 2024

Environ. Sci. Technol.

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Further reducing total nitrogen (TN) and total phosphorus (TP) in the secondary effluent needs to be realized effectively and in an eco-friendly manner. Herein, four pyrite/sawdust composite-based biofilters were established to treat simulated secondary effluent for 304 days. The results demonstrated that effluent TN and TP concentrations from biofilters under the optimal hydraulic retention time (HRT) of 3.5 h were stable at <2.0 and 0.1 mg/L, respectively, and no significant differences were observed between inoculated sludge sources. The pyrite/sawdust composite-based biofilters had low N2O, CH4, and CO2 emissions, and the effluent’s DOM was mainly composed of five fluorescence components. Moreover, mixotrophic denitrifiers (Thiothrix) and sulfate-reducing bacteria (Desulfosporosinus) contributing to microbial nitrogen and sulfur cycles were enriched in the biofilm. Co-occurrence network analysis deciphered that Chlorobaculum and Desulfobacterales were key genera, which formed an obvious sulfur cycle process that strengthened the denitrification capacity. The higher abundances of genes encoding extracellular electron transport (EET) chains/mediators revealed that pyrite not only functioned as an electron conduit to stimulate direct interspecies electron transfer by flagella but also facilitated EET-associated enzymes for denitrification. This study comprehensively evaluates the water–gas–biofilm phases of pyrite/sawdust composite-based biofilters during a long-term study, providing an in-depth understanding of boosted electron transfer in pyrite-based mixotrophic denitrification systems.

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Section: Materials and Methodsmentioning

confidence: 99%

Significantly Enhanced Nitrate and Phosphorus Removal by Pyrite/Sawdust Composite-Driven Mixotrophic Denitrification with Boosted Electron Transfer: Comprehensive Evaluation of Water–Gas–Biofilm Phases during a Long-Term Study

Zhou,

Jia,

et al. 2024

Environ. Sci. Technol.

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“…Earlier investigations of CH 4 biofiltration have primarily concentrated on abiotic aspects, for example, bed substances, heat, loading rate, and pH. − Several materials, such as perlite, granulated activated carbon, and compost, have been considered filter beds for CH 4 reduction . Lately, biological factors, such as microbes, have increased awareness in CH 4 biofiltration analyses …”

Section: History Of Biofiltrationmentioning

confidence: 99%

Air Pollutants Removal Using Biofiltration Technique: A Challenge at the Frontiers of Sustainable Environment

et al. 2022

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Air pollution is a central problem faced by industries during the production process. The control of this pollution is essential for the environment and living organisms as it creates harmful effects. Biofiltration is a current pollution management strategy that concerns removing odor, volatile organic compounds (VOCs), and other pollutants from the air. Recently, this approach has earned vogue globally due to its low-cost and straightforward technique, effortless function, high reduction efficacy, less energy necessity, and residual consequences not needing additional remedy. There is a critical requirement to consider sustainable machinery to decrease the pollutants arising within air and water sources. For managing these different kinds of pollutant reductions, biofiltration techniques have been utilized. The contaminants are adsorbed upon the medium exterior and are metabolized to benign outcomes through immobilized microbes. Biofiltration-based designs have appeared advantageous in terminating dangerous pollutants from wastewater or contaminated air in recent years. Biofiltration uses the possibilities of microbial approaches (bacteria and fungi) to lessen the broad range of compounds and VOCs. In this review, we have discussed a general introduction based on biofiltration and the classification of air pollutants based on different sources. The history of biofiltration and other mechanisms used in biofiltration techniques have been discussed. Further, the crucial factors of biofilters that affect the performance of biofiltration techniques have been discussed in detail. Finally, we concluded the topic with current challenges and future prospects.

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“…Zero-valent iron (ZVI) has been reported as an ideal candidate for simultaneous NO 3 – –N removal and PO 4 3– –P removal in the ZVI-based autotrophic denitrification (IAD) system due to its advantages of high reducibility, safe storage, easy application, and lower toxicity to the environment. − Nonetheless, there are two known problems that limit the application of the IAD system. First, large-size ZVI, for example, iron scraps and sponge iron, has a low specific surface area and exhibits poor denitrification efficiency, while nanoscale ZVI (nZVI) with higher reactivity can be easily oxidized and agglomerated. ,, Second, NH 4 + –N as the major byproduct of NO 3 – –N chemical reduction by ZVI requires additional treatment. − Most importantly, the fact that the P removal/precipitation process inevitably inhibits the bio-denitrification process in IAD has not been widely recognized.…”

Section: Introductionmentioning

confidence: 99%

Synchronous N and P Removal in Carbon-Coated Nanoscale Zerovalent Iron Autotrophic Denitrification─The Synergy of the Carbon Shell and P Removal

Wang

Huang

Zhou

et al. 2022

Environ. Sci. Technol.

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Fe0 is a promising electron donor for autotrophic denitrification in the simultaneous removal of nitrate and phosphorus in low C/N wastewater. However, P removal may inevitably inhibit bio-denitrification. It has not been well recognized and led to an overdose of iron materials. This study employed carbon-coated zerovalent iron (Fe0@C) to support autotrophic denitrification to mitigate the inhibition effects of P removal and enhance both N and P removal. The critical role of the carbon shell in Fe0@C was to block the direct contact between Fe0 and P and NO3 ––N, to maintain the Fe0 activity. Besides, P inhibited the chemical reduction of NO3 ––N by competing for Fe0 active sites. This indirectly boosted H2 generation and promoted bio-denitrification. P removal displayed negligible effects on microbial species but indirectly enhanced the nitrogen metabolic activities because of promoted H2 in Fe0@C-based autotrophic denitrification. Bio-denitrification, in turn, strengthened Fe–P co-precipitation by promoting the formation of ferric hydroxide as a secondary adsorbent for P removal. This study demonstrated an efficient method for simultaneous N and P removal in autotrophic denitrification and revealed the synergistic interactions among N and P removal processes.

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Simultaneously advanced removal of nitrogen and phosphorus in a biofilter packed with ZVI/PHBV/sawdust composite: Deciphering the succession of dominant bacteria and keystone species

Cited by 39 publications

References 49 publications

Significantly Enhanced Nitrate and Phosphorus Removal by Pyrite/Sawdust Composite-Driven Mixotrophic Denitrification with Boosted Electron Transfer: Comprehensive Evaluation of Water–Gas–Biofilm Phases during a Long-Term Study

Significantly Enhanced Nitrate and Phosphorus Removal by Pyrite/Sawdust Composite-Driven Mixotrophic Denitrification with Boosted Electron Transfer: Comprehensive Evaluation of Water–Gas–Biofilm Phases during a Long-Term Study

Air Pollutants Removal Using Biofiltration Technique: A Challenge at the Frontiers of Sustainable Environment

Synchronous N and P Removal in Carbon-Coated Nanoscale Zerovalent Iron Autotrophic Denitrification─The Synergy of the Carbon Shell and P Removal

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