Sulfur autotrophic denitrification filter and heterotrophic denitrification filter: Comparison on denitrification performance, hydrodynamic characteristics and operating cost

Wang, Shusen; Cheng, Hao-Yi; Zhang, Hao; Su, Shi-Gang; Sun, Yaru; Wang, Hongcheng; Han, Jinglong; Wang, Aijie; Guadie, Awoke

doi:10.1016/j.envres.2021.111029

Cited by 46 publications

(18 citation statements)

References 30 publications

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“…The differences in r N2 and r N2O thus facilitated the efficient N 2 O recovery from NO bounded in Fe(II)EDTA. Similar trends regarding these two rates were also obtained in the heterotrophic system, in which Fe(II)EDTA‐NO ranging from 5 to 15 were found to improve those values (S. S. Wang, Cheng, et al, 2021).…”

Section: Resultssupporting

confidence: 70%

“…The sulfur‐driven system in this study was able to achieve relatively high N 2 O accumulation efficiency even at the initial Fe(II)EDTA‐NO level of 5 mM (39%–40%), which is much higher than the results from our previous study using organic carbon source (2.8%–30.8%) (S. S. Wang, Cheng, et al, 2021). Compared to the results from heterotrophic denitrification system at the similar Fe(II)EDTA‐NO levels (S. S. Wang, Cheng, et al, 2021), the r NO and r N2O of each test obtained herewith were significantly lower, especially for the case of r N2O ( p < 0.01).…”

Section: Resultscontrasting

confidence: 62%

“…The concentrated denitrifying sludge was then inoculated into the serum bottle. The Fe(II)EDTA‐NO was prepared according to previous reports (van der Maas et al, 2003; S. S. Wang, Cheng, et al, 2021; Zang & van Eldik, 1990).…”

Section: Methodsmentioning

confidence: 99%

“…The resultant supernatant, which contained crude enzyme extracts, was immediately sampled for measuring enzyme activity. Two ELISA Kits produced by Shanghai Jingkang biology engineering co., Ltd. (JLC14522 and JLC14500) were used to determine the relative enzymatic activities, and five parallel tests were conducted to verify the accuracy of measurement (S. S. Wang, Cheng, et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

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Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

Wang

Wei

et al. 2021

Biotech & Bioengineering

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Nitrous oxide (N2O) was previously deemed as a potent greenhouse gas but is actually an untapped energy source, which can accumulate during the microbial denitrification of nitric oxide (NO). Compared with the organic electron donor required in heterotrophic denitrification, elemental sulfur (S0) is a promising electron donor alternative due to its cheap cost and low biomass yield in sulfur‐driven autotrophic denitrification. However, no effort has been made to test N2O recovery from sulfur‐driven denitrification of NO so far. Therefore, in this study, batch and continuous experiments were carried out to investigate the NO removal performance and N2O recovery potential via sulfur‐driven NO‐based denitrification under various Fe(II)EDTA‐NO concentrations. Efficient energy recovery was achieved, as up to 35.5%–40.9% of NO was converted to N2O under various NO concentrations. N2O recovery from Fe(II)EDTA‐NO could be enhanced by the low bioavailability of sulfur and the acid environment caused by sulfur oxidation. The NO reductase (NOR) and N2O reductase (N2OR) were inhibited distinctively at relatively low NO levels, leading to efficient N2O accumulation, but were suppressed irreversibly at NO level beyond 15 mM in continuous experiments. Such results indicated that the regulation of NO at a relatively low level would benefit the system stability and NO removal capacity during long‐term system operation. The continuous operation of the sulfur‐driven Fe(II)EDTA‐NO‐based denitrification reduced the overall microbial diversity but enriched several key microbial community. Thauera, Thermomonas, and Arenimonas that are able to carry out sulfur‐driven autotrophic denitrification became the dominant organisms with their relative abundance increased from 25.8% to 68.3%, collectively.

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Section: Resultssupporting

confidence: 70%

Section: Resultscontrasting

confidence: 62%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

Wang

Wei

et al. 2021

Biotech & Bioengineering

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“…Heterotrophic denitrification is the main denitrification mechanism in traditionally CWs, and carbon source is considered the main limiting factor for the denitrification process (Pan et al 2020, Si et al 2018, Tan et al 2020, Wang et al 2021. Theoretically, the estimated C/N ratio for heterotrophic denitrification is 3.74 (Anjali &Sabumon 2015, Chiu &Chung 2003.…”

Section: Introductionmentioning

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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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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Sulfur autotrophic denitrification filter and heterotrophic denitrification filter: Comparison on denitrification performance, hydrodynamic characteristics and operating cost

Cited by 46 publications

References 30 publications

Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

Sulfur‐driven autotrophic denitrification of nitric oxide for efficient nitrous oxide recovery

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

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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