Nanoplastics Disturb Nitrogen Removal in Constructed Wetlands: Responses of Microbes and Macrophytes

Yang, Xiangyu; He, Qiang; Guo, Fucheng; Sun, Xiaohui; Zhang, Junmao; Chen, Mengli; Vymazal, Jan; Chen, Yi

doi:10.1021/acs.est.0c03324

Cited by 193 publications

(37 citation statements)

References 53 publications

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“…Studies have shown that nitric oxide (NO) reductase, encoded by nirK and located in the membrane periplasm, can be expressed under both aerobic and anaerobic conditions, and has a high affinity for NO . Although research has shown that plants can provide low molecular weight organics and oxygen for microorganisms, , they had a weak effect on the abundance of functional genes in this study ( P > 0.05). Therefore, compared to the effects of temperature, plants, and spatial position, construction type was the primary variable related to the distribution of functional genes of nxrA , amoA , nosZ , mmoX , and phoD , while it had little effect on the abundance of nirK .…”

Section: Resultscontrasting

confidence: 69%

“…The number of connections for the HSSF CW was 82, which was much higher than that of the VF (24 connections) and SF (25 connections) CWs. The number of nodes for the HSSF CW was higher than that of the VF and SF CWs, and the average degree shows that the HSSF CW (4.97) was higher than the VF (2.40) and SF (2.38) CWs (Table ). Network complexity can depend on microbial richness .…”

Section: Resultsmentioning

confidence: 99%

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Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage

Zeng

Dai

Zhang

et al. 2021

Environ. Sci. Technol.

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The microbial characteristics related to nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) removal were investigated in three pilot scale constructed wetlands (CWs). Compared to horizontal subsurface flow (HSSF) and surface flow (SF) CWs, the aerobic vertical flow (VF) CW enriched more functional bacteria carrying genes for nitrification (nxrA, amoA), denitrification (nosZ), dephosphorization (phoD), and methane oxidation (mmoX), while the removal of COD, total P, and total N increased by 33.28%, 255.28%, and 299.06%, respectively. The co-occurrence network of functional bacteria in the HSSF CW was complex, with equivalent bacterial cooperation and competition. Both the VF and SF CWs exhibited a simple functional topological structure. The VF CW reduced functional redundancy by forming niche differentiation, which filtered out keystone species that were closely related to each other, thus achieving effective sewage purification. Alternatively, bacterial niche overlap protected a single function in the SF CW. Compared with the construction type, temperature, and plants had less effect on nutrient removal in the CWs from this subtropical region. Partial least-squares path modeling (PLS–PM) suggests that high dissolved oxygen and oxidation–reduction potential promoted a diverse bacterial community and that the nonkeystone bacteria reduced external stress for functional bacteria, thereby indirectly promoting nutrient removal.

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Section: Resultscontrasting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage

Zeng

Dai

Zhang

et al. 2021

Environ. Sci. Technol.

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“…The determination methods of ammonia monooxygenase (AMO), nitrite reductase (NIR), and nitrate reductase (NAR) activities has been described in the previous study (Yang et al 2020). (3…”

Section: Analysis Methodsmentioning

confidence: 99%

Enhanced nitrogen and phosphorus removal by natural pyrite–based constructed wetland with intermittent aeration

Feng

Zhang³

et al. 2021

Environ Sci Pollut Res

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Four subsurface flow constructed wetlands (SFCWs) filled with different substrates including ceramsite, ceramsite+pyrite, ceramsite+ferrous sulfide, and ceramsite+pyrite+ferrous sulfide (labeled as SFCW-S1, SFCW-S2, SFCW-S3, and SFCW-S4) were constructed, and the removal of nitrogen and phosphorus by these SFCWs coupled with intermittent aeration in the front section was discussed. The key findings from different substrate analyses, including nitrification and denitrification rate, enzyme activity, microbial community structure, and the X-ray diffraction, revealed the nitrogen and phosphorus removal mechanism. The results showed that the nitrogen and phosphorus removal efficiency for SFCW-S1 always remains the lowest, and the phosphorus removal efficiency for SFCW-S4 is recorded as the highest one. However, after controlling the dissolved oxygen by intermittent aeration in the front section of SFCWs, the nitrogen and phosphorus removal efficiencies of SFCWs-S2 and S4 becomes higher than those of SFCW-S1, and SFCW-S3. It was noticed that the pollutants were removed mainly in the front section of the SFCWs. Both precipitation and adsorption on the substrate were the main mechanisms for phosphorus removal. A minute difference of nitrification rate and ammonia monooxygenase activity was observed in the SFCWs aeration zone. The denitrification rates, nitrate reductase, nitrite reductase, and electron transport system activity for SFCW-S2 and SFCW-S4 were higher than those detected for SFCW-S1 and SFCW-S3 in the non-aerated zone. Proteobacteria was the largest phyla found in the SFCWs. Moreover, Thiobacillus occupied a large proportion found in SFCW-S2, and SFCW-S4, and it played a crucial role in pyrite-driven autotrophic denitrification.

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“…The determination methods of ammonia monooxygenase (AMO), nitrite reductase (NIR), and nitrate reductase (NAR) activities has been described in the previous study (Yang et al 2020).…”

Section: Analysis Methodsmentioning

confidence: 99%

Enhanced Nitrogen and Phosphorus Removal by Natural Pyrite based Constructed Wetland with Intermittent Aeration

Feng

Zhang³

et al. 2021

Preprint

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Four subsurface flow constructed wetlands (SFCWs) filled with different substrates including ceramsite, ceramsite + pyrite, ceramsite + ferrous sulfide, and ceramsite + pyrite + ferrous sulfide (labeled as SFCW-S1, SFCW-S2, SFCW-S3, and SFCW-S4) were constructed, and the removal of nitrogen and phosphorus by these SFCWs coupled with intermittent aeration in the front section was discussed. The key findings from different substrate analyses, including nitrification and denitrification rate, enzyme activity, microbial community structure, and the X-ray diffraction, revealed the nitrogen and phosphorus removal mechanism. The results showed that the nitrogen and phosphorus removal efficiency for SFCW-S1 always remains the lowest, and the phosphorus removal efficiency for SFCW-S4 is recorded as the highest one. However, after controlling the dissolved oxygen by intermittent aeration in the front section of SFCWs, the nitrogen and phosphorus removal efficiencies of SFCWs-S2 and S4 becomes higher than those of SFCW-S1, and SFCW-S3. It was noticed that the pollutants were removed mainly in the front section of the SFCWs. Both precipitation and adsorption on the substrate were the main mechanisms for phosphorus removal. A minute difference of nitrification rate and ammonia monooxygenase activity was observed in the SFCWs aeration zone. The denitrification rates, nitrate reductase, nitrite reductase, and electron transport system activity for SFCW-S2 and SFCW-S4 were higher than those detected for SFCW-S1 and SFCW-S3 in the non-aerated zone. Proteobacteria was the largest phyla found in the SFCWs. Moreover, Thiobacillus occupied a large proportion found in SFCW-S2, and SFCW-S4, and it played a crucial role in pyrite-driven autotrophic denitrification.

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Nanoplastics Disturb Nitrogen Removal in Constructed Wetlands: Responses of Microbes and Macrophytes

Cited by 193 publications

References 53 publications

Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage

Keystone Species and Niche Differentiation Promote Microbial N, P, and COD Removal in Pilot Scale Constructed Wetlands Treating Domestic Sewage

Enhanced nitrogen and phosphorus removal by natural pyrite–based constructed wetland with intermittent aeration

Enhanced Nitrogen and Phosphorus Removal by Natural Pyrite based Constructed Wetland with Intermittent Aeration

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