Influence mechanism of filling ratio on solid-phase denitrification with polycaprolactone as biofilm carrier

He, Xin; Zhang, Shiyang; Jiang, Yao; Li, Meng; Yuan, Julin; Wang, Guangjun

doi:10.1016/j.biortech.2021.125401

Cited by 30 publications

(11 citation statements)

References 48 publications

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“…The following supporting information can be downloaded at: , Figure S1: The variations in TN removal efficiency (%) in different SPD systems; Table S1: Primers of target genes used in qPCR analysis; Table S2: The results of ANOVA for the model (response: TN removal efficiency); Table S3: The optimized TN removal efficiency based on RSM; Table S4: The actual TN removal efficiency under optimized conditions; Table S5: Functional classification of major genera in bacterial and fungal communities. [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 ] of the references in the main text are from the supplementary material.…”

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confidence: 99%

Improved Denitrification Performance of Polybutylene Succinate/Corncob Composite Carbon Source by Proper Pretreatment: Performance, Functional Genes and Microbial Community Structure

et al. 2023

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Blending biodegradable polymers with plant materials is an effective method to improve the biodegradability of solid carbon sources and save denitrification costs, but the recalcitrant lignin in plant materials hinders the microbial decomposition of available carbon sources. In the present study, corncob pretreated by different methods was used to prepare polybutylene succinate/corncob (PBS/corncob) composites for biological denitrification. The PBS/corncob composite with alkaline pretreatment achieved the optimal NO3−-N removal rate (0.13 kg NO3−-N m−3 day−1) with less adverse effects. The pretreatment degree, temperature, and their interaction distinctly impacted the nitrogen removal performance and dissolved organic carbon (DOC) release, while the N2O emission was mainly affected by the temperature and the interaction of temperature and pretreatment degree. Microbial community analysis showed that the bacterial community was responsible for both denitrification and lignocellulose degradation, while the fungal community was primarily in charge of lignocellulose degradation. The outcomes of this study provide an effective strategy for improving the denitrification performance of composite carbon sources.

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confidence: 99%

Improved Denitrification Performance of Polybutylene Succinate/Corncob Composite Carbon Source by Proper Pretreatment: Performance, Functional Genes and Microbial Community Structure

et al. 2023

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“…In terms of VFA, the released acetic acid and propionic acid were identified with a concentration of 6.1 ± 0.6 mg/g and 5.0 ± 0.9 mg/g, respectively. It is worth noting that only biodegradable, organic compounds with weak binding diffused into water due to a concentration gradient, and the carbon source release due to the macromolecules hydrolysis into small soluble molecules by microorganisms should also be considered [ 31 , 32 , 33 ]. However, the carbon source from the biochar release is still limited, which may not fully surrogate the missing carbon source in the influent.…”

Section: Resultsmentioning

confidence: 99%

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Wang

Shen

et al. 2023

Membranes

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Membrane bioreactors (MBRs) are frequently used to treat municipal wastewater, but membrane fouling is still the main weakness of this technology. Additionally, the low carbon-nitrogen (C/N) ratio influent has been shown to not only increase the membrane fouling, but also introduce challenges to meet the effluent discharge standard for nitrogen removal. Herein, the authors addressed the challenges by adding cost-effective biochar. The results suggested that the biochar addition can enable membrane fouling alleviation and nitrogen removal improvement. The reduced membrane fouling can be ascribed to the biochar adsorption capacity, which facilitates to form bigger flocs with carbon skeleton in biochar as a core. As a result, the biochar addition significantly altered the mixed liquor suspension with soluble microbial product (SMP) concentration reduction of approximately 14%, lower SMP protein/polysaccharide ratio from 0.28 ± 0.02 to 0.22 ± 0.03, smaller SMP molecular weight and bigger sludge particle size from 67.68 ± 6.9 μm to 113.47 ± 4.8 μm. The nitrogen removal is also dramatically improved after biochar addition, which can be due to the initial carbon source release from biochar, and formation of aerobic–anaerobic microstructures. Microbial diversity analysis results suggested more accumulation of denitrification microbes including norank_f__JG30-KF-CM45 and Plasticicumulans. Less relative abundance of Aeromonas after biochar addition suggested less extracellular polymer substance (EPS) secretion and lower membrane fouling rate.

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“…The activated sludge inoculated into the reactor was taken from the return sludge of the secondary sedimentation tank of an anaerobic/anoxic/aerobic (A 2 /O) process wastewater treatment plant in Wuhan. Before inoculation, the activated sludge was washed three times with tap water and then three times with Milli-Q water to remove soluble substances (He et al, 2021). The initial mixed liquid suspended solids (MLSS) concentration was 3000 mg/L, the mixed liquid volatile suspended solids (MLVSS) concentration was 1800 mg/L, and the sludge settling velocity (SV) was 35%.…”

Section: System Construction and Start-upmentioning

confidence: 99%

“…Currently available synthetic biodegradable polymers for heterotrophic denitrification include polyhydroxyalkanoate (PHA), PCL, polybutylene succinate (PBS), and others (He et al, 2021). They possess a high denitrification rate as well as a low release of dissolved organic matter, but the cost is higher (Wang & Chu, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of hydraulic retention time on performance of autotrophic, heterotrophic, and split‐mixotrophic denitrification systems supported by polycaprolactone/pyrite: Difference and potential explanation

Yuan

Zhu

Guo³

et al. 2022

Water Environment Research

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Biological denitrification is still the most important pathway to purifying nitrate‐containing wastewater. In this study, pyrite (FeS2) and polycaprolactone (PCL) were used as electron donors to construct sole or combined denitrification systems, that is, pyrite‐based autotrophic denitrification (PAD) system, PCL‐supported heterotrophic denitrification (PHD) system, and split‐mixotrophic denitrification system (combined PAD + PHD), all of which were operated under five different hydraulic retention times (HRTs) for 150 days. The results showed that the removal rates (RE) of nitrate (NO3−‐N) and inorganic phosphorus (PO43−‐P) by PAD were 91% and 94%, respectively, but the effluent sulfate (SO42−) concentration was as high as 168.2 mg/L; the removal rate of NO3−‐N by PHD was higher than 99%, but the PO43−‐P could not be removed ideally; the removal rates of NO3−‐N and PO43−‐P by PAD + PHD were higher than 95% and 99%, respectively, and the effluent SO42− concentration was only 7.2 mg/L. Through the analysis of the surface scanning electron microscope (SEM) images of the two kinds of media before and after use, it was found that the coupled mode of PAD + PHD was more favorable for biofilm formation than the sole PAD or PHD process, and the microorganisms in the PAD + PHD mode made more full use of electron donors. Moreover, the biomass of the PAD + PHD mode was lower than that of the PAD or PHD process, but the denitrification efficiency of the coupled mode was more efficient, indicating that the functional microorganisms in the PAD + PHD mode might have a certain synergistic effect. Practitioner Points Removal rates of NO3−, PO43−, and SO42− by PAD were 91%, 94%, and −233%, respectively. Removal rate of NO3− by PHD exceeded 99%, but PO43− could not be removed ideally. Removal rates of NO3−, PO43−, and SO42− by PAD + PHD were 95%, 99%, and 86%, respectively. The coupled mode was more favorable for biofilm formation than the sole PAD or PHD. The coupled mode had lower biomass but got more excellent denitrification efficiency.

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Influence mechanism of filling ratio on solid-phase denitrification with polycaprolactone as biofilm carrier

Cited by 30 publications

References 48 publications

Improved Denitrification Performance of Polybutylene Succinate/Corncob Composite Carbon Source by Proper Pretreatment: Performance, Functional Genes and Microbial Community Structure

Improved Denitrification Performance of Polybutylene Succinate/Corncob Composite Carbon Source by Proper Pretreatment: Performance, Functional Genes and Microbial Community Structure

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Effect of hydraulic retention time on performance of autotrophic, heterotrophic, and split‐mixotrophic denitrification systems supported by polycaprolactone/pyrite: Difference and potential explanation

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