Microbial explanation to performance stratification along up-flow solid-phase denitrification column packed with polycaprolactone

Zhang, Shiyang; Xiao, Longqu; Tang, Zhiwei; Zhang, Xiangling; Wang, Zhi

doi:10.1016/j.biortech.2021.126066

Cited by 21 publications

(5 citation statements)

References 42 publications

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“…At the phylum level, the main taxa were Proteobacteria , Patescibacteria , Bacteroidota , Desulfobacterota , and Firmicutes in the three reactors (Table S3). It has been reported that Proteobacteria and Patescibacteria are commonly dominant taxa in the PAD or PHD system and play a crucial role in the denitrification process (Yuan et al, 2023; Zhang, Xiao, et al, 2022). In the FeS 2 layer of R1 or R3, Proteobacteria was the most abundant phylum, followed by Patescibacteria .…”

Section: Resultsmentioning

confidence: 99%

“…As a PHD system, R2 was able to provide sufficient carbon sources for heterotrophic denitrification, which was also evident from the NO 3 − ‐N removal rate. For the NO 2 − ‐N accumulated in the FeS 2 ‐filled zone in R3 PAD + PHD , it was effectively removed after passing through the PCL‐filled zone, indicating the heterotrophic denitrifying bacteria attached to the surface of the PCL was able to carry out complete denitrification, thus contributing to the reduction of NO 2 − ‐N (Zhang, Xiao, et al, 2022). The absence of NO 2 − ‐N accumulation in R3 PAD + PHD indicated that the PPMD system had a more efficient denitrification performance compared to the PAD system.…”

Section: Resultsmentioning

confidence: 99%

“…The effluent concentrations of NH 4 + -N (NH 4 + -N eff ) of R1 in phases I-III were 0.44 ± 0.56, 0.27 ± 0.30, and 0.25 ± 0.36 mg/L, respectively, indicating a slight accumulation. At the beginning of each phase, the NH 4 + -N accumulation was high and reached up to 1.84 mg/L, which might be caused by the lysis of some bacteria unable to adapt to the new adjustment of particle size (Zhang, Xiao, et al, 2022). In addition, the NH 4 + -N accumulation in R3 PAD was similar to that in R1, showing a slight accumulation (<1.0 mg/L), and there was no significant difference in NH 4 + -N eff among phases I-III for both R1 and R3 PAD .…”

Section: + -N Accumulationmentioning

confidence: 99%

“…This might be also the reason why the NH 4 + -N eff of R3 PAD + PHD was consistently higher than that of the R3 PAD throughout the operating period (Figure 2d). Similar to R3 PAD + PHD , R2 contained a large number of organic carbon sources, and NH 4 + -N was mainly produced by DNRA/ANRA (Zhang, Xiao, et al, 2022). stable.…”

Section: + -N Accumulationmentioning

confidence: 99%

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Effect of pyrite particle size on the denitrification performance of autotrophic or split‐mixotrophic bioreactors supported by pyrite/polycaprolactone

Guo,

Peng,

Tan

et al. 2024

Water Environment Research

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In this study, a pyrite‐based autotrophic denitrification (PAD) system, a polycaprolactone (PCL)‐supported heterotrophic denitrification (PHD) system, and a pyrite+PCL‐based split‐mixotrophic denitrification (PPMD) system were constructed. The pyrite particle size was controlled in 1–3, 3–5, or 5–8 mm in both the PAD and PPMD systems to investigate the effect of pyrite particle size on the denitrification performance of autotrophic or split‐mixotrophic bioreactors. It was found that the PAD system achieved the best denitrification efficiency with an average removal rate of 98.98% in the treatment of 1‐ to 3‐mm particle size, whereas it was only 19.24% in the treatment of 5‐ to 8‐mm particle size. At different phases of the whole experiment, the nitrate removal rates of both the PHD and PPMD systems remained stable at a high level (>94%). Compared with the PAD or PHD system, the PPMD system reduced the concentrations of sulfate and chemical oxygen demand in the final effluent efficiently. The interconnection network diagram explained the intrinsic metabolic pathways of nitrogen, sulfur, and carbon in the three denitrification systems at different phases. In addition, the microbial community analysis showed that the PPMD system was beneficial for the enrichment of Firmicutes. Finally, the impact mechanism of pyrite particle size on the performance of the PPMD system was proposed.Practitioner Points The reduction of pyrite particle size was beneficial for improving the efficiency of the PAD process. The change in particle size had an effect on NO2−‐N accumulation in the PAD system. The accumulation of NH4+‐N in the PPMD system increased with the decrease in particle size. The reduction of pyrite particle size increased the production of SO42− in the PAD and PPMD systems. The correlations among the effluent indicators of the PAD and PPMD systems could be well explained.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: + -N Accumulationmentioning

confidence: 99%

Section: + -N Accumulationmentioning

confidence: 99%

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Effect of pyrite particle size on the denitrification performance of autotrophic or split‐mixotrophic bioreactors supported by pyrite/polycaprolactone

Guo,

Peng,

Tan

et al. 2024

Water Environment Research

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“…It suggests that slow carbon releasing materials are highly required. Solid carbon sources, including polyvinyl alcohol (PVA), carrageenan (CG), polylactic acid (PLA), polycaprolactone (PCL), and some their composites have been used as slow-release carbon sources in mixotrophic denitrification, and the solid carbon source utilization showed enhanced denitrification performance [3,[13][14][15][16][17]. The carbon can slowly release from the solid carbon source during degradation by microorganisms, and thus eliminates the risk of COD concentration exceeding the discharging limit.…”

Section: Introductionmentioning

confidence: 99%

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Hong¹,

Tang

Feng

et al. 2022

Separations

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Mixotrophic denitrification has showed great potential for treating wastewater with a low C/N ratio. Mixotrophic denitrification is the process combining autotrophic denitrification and heterotrophic denitrification in one system. It can compensate the disadvantage of the both denitrifications. Instead of using sodium acetate and glucose as carbon source for the heterotrophic denitrification, agriculture solid wastes including rice straw (RS), wheat straw (WS), and corncob (CC) were employed in this study to investigate their potential as carbon source for treating low C/N wastewater. The carbon releasing pattern of the three carbon rich materials has been studied as well as their capacity in denitrification. The results showed that the highest denitrification occurred in the corncob system which was 0.34 kg N/(m3·d). Corncob was then selected to combine with sulfur beads to build the mixotrophic denitrification system. The reactor packed with sulfur bead on the top and corncob on the bottom achieved 0.34 kg N/(m3·d) denitrification efficiency, which is higher than that of the reactor packed with completely mixed sulfur bead and corncob. The autotrophic denitrification and heterotrophic denitrification were 42.2% and 57.8%, respectively. The microorganisms in the sulfur layer were Thermomonas, Ferritrophicum, Thiobacillus belonging to autotrophic denitrification bacteria. Kouleothrix and Geothrix were mostly found in the corncob layer, which have the function for fiber hydrolysis and denitrification. The study has provided an insight into agriculture solid waste application and enhancement on denitrification of wastewater treatment.

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The intrinsic relevance of nitrogen removal pathway to varying nitrate loading rate in a polycaprolactone-supported denitrification system

et al. 2022

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Microbial explanation to performance stratification along up-flow solid-phase denitrification column packed with polycaprolactone

Cited by 21 publications

References 42 publications

Effect of pyrite particle size on the denitrification performance of autotrophic or split‐mixotrophic bioreactors supported by pyrite/polycaprolactone

Effect of pyrite particle size on the denitrification performance of autotrophic or split‐mixotrophic bioreactors supported by pyrite/polycaprolactone

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

The intrinsic relevance of nitrogen removal pathway to varying nitrate loading rate in a polycaprolactone-supported denitrification system

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