Laboratory investigation on Bacillus subtilis addition to alleviate bio-clogging for constructed wetlands

Tang, Ping; Xiang, Zhengrong; Ma, Penghui; Zhou, Yongchao

doi:10.1016/j.envres.2020.110642

Cited by 9 publications

(2 citation statements)

References 44 publications

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“…For example, compared with the alpine meadows, the chemoheterotrophic diazotrophs were more abundant in riparian wetland soils. This could be mainly caused by the enrichments of organic carbon and other nutrients such as microbial biomass ( Supplementary Table 1 and Supplementary Figure 2 ; Ping et al, 2021 ). Moreover, compared with riparian wetlands, the alpine meadows are usually much more heavily grazed by livestock.…”

Section: Discussionmentioning

confidence: 99%

Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows

et al. 2022

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Global warming can trigger dramatic glacier area shrinkage and change the flux of glacial runoff, leading to the expansion and subsequent retreat of riparian wetlands. This elicits the interconversion of riparian wetlands and their adjacent ecosystems (e.g., alpine meadows), probably significantly impacting ecosystem nitrogen input by changing soil diazotrophic communities. However, the soil diazotrophic community differences between glacial riparian wetlands and their adjacent ecosystems remain largely unexplored. Here, soils were collected from riparian wetlands and their adjacent alpine meadows at six locations from glacier foreland to lake mouth along a typical Tibetan glacial river in the Namtso watershed. The abundance and diversity of soil diazotrophs were determined by real-time PCR and amplicon sequencing based on nifH gene. The soil diazotrophic community assembly mechanisms were analyzed via iCAMP, a recently developed null model-based method. The results showed that compared with the riparian wetlands, the abundance and diversity of the diazotrophs in the alpine meadow soils significantly decreased. The soil diazotrophic community profiles also significantly differed between the riparian wetlands and alpine meadows. For example, compared with the alpine meadows, the relative abundance of chemoheterotrophic and sulfate-respiration diazotrophs was significantly higher in the riparian wetland soils. In contrast, the diazotrophs related to ureolysis, photoautotrophy, and denitrification were significantly enriched in the alpine meadow soils. The iCAMP analysis showed that the assembly of soil diazotrophic community was mainly controlled by drift and dispersal limitation. Compared with the riparian wetlands, the assembly of the alpine meadow soil diazotrophic community was more affected by dispersal limitation and homogeneous selection. These findings suggest that the conversion of riparian wetlands and alpine meadows can significantly alter soil diazotrophic community and probably the ecosystem nitrogen input mechanisms, highlighting the enormous effects of climate change on alpine ecosystems.

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Section: Discussionmentioning

confidence: 99%

Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows

et al. 2022

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“…Recently, several innovative dosing strategies were presented, such as addition of B. subtilis (Ping et al 2021), enzymes (Tang et al 2018), biosurfactants (Du et al 2016) and rhamnolipids-citric acid compound (Cao et al 2021), which have good solubilizing effect and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Bioclogging alleviation for constructed wetland based on the interaction among biofilm growth and hydrodynamics

Tang

Chen

Zhang

et al. 2022

Environ Sci Pollut Res

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Bioclogging is the most crucial operation problem of the constructed wetlands, which reduce its removal e ciency and life span. A strategy through properly increasing hydraulic loading is proposed in this study to alleviate the bioclogging for CWs. The two-dimensional porous media ow cell (2D PMFC) test indicated that a quadratic correlation was found between local bio lms growth rate and the near-wall Reynolds number (r > 0.765, p < 0.05). The bio lm growth rate declined with the ow rate when Re exceeded 6. It was also found that the higher owrate (6 mL/min) lead to the homogeneous bio lm and velocity distribution in the PFMC. The column test indicated that the highest hydraulic loading (9.2 cm/h) produced the smallest decrease in hydraulic conductivity, which was 80 times more than that of low hydraulic load (3.0 cm/h) at the end (40 days) of experiment. Moreover, the relatively homogenized distribution of bio lm was found along the column with the highest hydraulic loading, which con rmed that the proper increase in hydraulic loading can alleviate bioclogging.

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Bio-clogging mitigation in vertical subsurface flow constructed wetlands using rhamnolipids-citric acid compound

Cao

Tong

et al. 2021

Chemical Engineering Journal

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Laboratory investigation on Bacillus subtilis addition to alleviate bio-clogging for constructed wetlands

Cited by 9 publications

References 44 publications

Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows

Soil diazotrophic abundance, diversity, and community assembly mechanisms significantly differ between glacier riparian wetlands and their adjacent alpine meadows

Bioclogging alleviation for constructed wetland based on the interaction among biofilm growth and hydrodynamics

Bio-clogging mitigation in vertical subsurface flow constructed wetlands using rhamnolipids-citric acid compound

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