Mixotrophic denitrification processes based on composite filler for low carbon/nitrogen wastewater treatment

Tang, Liaofan; Li, Ji; Li, Yong; Zhang, Xiaolei; Shi, Xianbin

doi:10.1016/j.chemosphere.2021.131781

Cited by 29 publications

(7 citation statements)

References 29 publications

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“…In Phases II and III, the effluent COD concentration remained relatively stable. Previous studies have shown that PCL as filler can release COD obviously, and the release amount exceeds the consumption of microbial assimilation and respiration; after a period, the release amount reaches the maximum and then remained stable (He et al, 2021; Tang et al, 2022).…”

Section: Resultsmentioning

confidence: 98%

“…According to Equation (1), theoretically, 1.5-mol NO 3 À -N can be removed and 1-mol SO 4 2À can be produced simultaneously. In a previous study, an efficient mixotrophic denitrification system was constructed that combined polycaprolactone (PCL) with elemental sulfur in different proportions (Tang et al, 2022). It was found that when the ratio was 2, the effluent pH was neutral and the produced SO 4 2À was less than that by the sole sulfur-based autotrophic denitrification (SAD), but the mixotrophic denitrification could not achieve simultaneous phosphorus removal.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 98%

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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“…It must be also reported that the simultaneous activity of AUT and HD was experimentally observed to decrease N 2 O accumulation and emission 25 , which is neglected in the present model. Previous studies also demonstrated that the addition of organic substances have a good influence on pH that makes the typical addition of limestone during SdAD unnecessary 18 , 40 .…”

Section: Scenario Ii: Cod Injectionmentioning

confidence: 99%

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Guerriero¹,

Mattei²,

Papirio

et al. 2022

Sci Rep

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The aim of this study was to develop a mathematical model to assess the effect of soluble microbial products production and external carbon source addition on the performance of a sulfur-driven autotrophic denitrification (SdAD) process. During SdAD, the growth of autotrophic biomass (AUT) was accompanied by the proliferation of heterotrophic biomass mainly consisting of heterotrophic denitrifiers (HD) and sulfate-reducing bacteria (SRB), which are able to grow on both the SMP derived from the microbial activities and on an external carbon source. The process was supposed to occur in a sequencing batch reactor to investigate the effects of the COD injection on both heterotrophic species and to enhance the production and consumption of SMP. The mathematical model was built on mass balance considerations and consists of a system of nonlinear impulsive differential equations, which have been solved numerically. Different simulation scenarios have been investigated by varying the main operational parameters: cycle duration, day of COD injection and quantity of COD injected. For cycle durations of more than 15 days and a COD injection after the half-cycle duration, SdAD represents the prevailing process and the SRB represent the main heterotrophic family. For shorter cycle duration and COD injections earlier than the middle of the cycle, the same performance can be achieved increasing the quantity of COD added, which results in an increased activity of HD. In all the performed simulation even in the case of COD addition, AUT remain the prevailing microbial family in the reactor.

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“…Hu et al [50] used corn husk as a denitrifying solid slow-release carbon source; the average effluent COD was 20-50 mg•L −1 in their experiment. Tang et al [51] used PCL and sulfur as a composite carbon source. The COD of the effluent was 40 mg•L −1 and it fluctuated greatly.…”

Section: Carbon Source Use Characteristicsmentioning

confidence: 99%

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Wang,

Liu,

et al. 2023

Fermentation

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Wastewater with a low carbon/nitrogen (C/N) ratio is widespread and difficult to treat. The addition of an external carbon source is an effective method for treating such wastewater. Therefore, we aimed to prepare a self-releasing carbon biofilm carrier using agricultural waste (corncobs), polyvinyl alcohol, and sponge iron in various ratios to provide a carbon source that would facilitate denitrification, providing an optimal environment for microorganisms. We found that the carbon release of the MAC biofilm carrier that accumulated over 60 d was 116.139 mg of chemical oxygen demand (COD)·g−1, whereas the accumulated total nitrogen release was approximately 0 mg·(g·d)−1. The NO3−-N removal rate after 24 h reached 98.1%, whereas the theoretical use rate of the carbon source (in terms of COD) was stable at 90.34%. In addition, the sum of the abundances of the denitrifying and cellulose-degrading bacteria was 49.89%. Furthermore, biofilm carriers are used as functional carriers that contribute to cellulose degradation, a process in which sponge iron produces Fe2+ to provide electron donors and shuttles for denitrifying bacteria and forms the iron cycle, thereby inducing an increase in microbial abundance; this increase then facilitates the microbial degradation of cellulose and synergistic denitrification through interspecific bacterial cooperation. This study provides a new and effective method for enhancing the denitrification of wastewater with low C/N ratios.

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Mixotrophic denitrification processes based on composite filler for low carbon/nitrogen wastewater treatment

Cited by 29 publications

References 29 publications

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

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

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

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