Simultaneous nitriﬁcation and denitriﬁcation process using novel surface-modified suspended carriers for the treatment of real domestic wastewater

Liu, Tao; He, Xiaolu; Jia, Guangyue; Xu, Jiawei; Quan, Xie; You, Shijie

doi:10.1016/j.chemosphere.2020.125831

Cited by 125 publications

(24 citation statements)

References 42 publications

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“…Substrate diffusion and bacterial stratification within a biofilm matrix can result in different organic carbon and nitrogen usage efficiencies ( Pan et al., 2019 ). In addition, simultaneous nitrification and denitrification (SND) can occur in biofilm systems due to biofilm stratification and diffusion differences between electron donors and acceptors ( Liu et al., 2020 ; Pan et al., 2019 ). The SND effect is especially manifested in biofilm systems under low DO conditions or when thick biofilms can create DO deficiencies inside the biofilm matrix ( Liu et al., 2020 ; Pan et al., 2019 ; Yan et al., 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Dougherty

Chen

2021

Chemosphere

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To promote the environmental sustainability of rural sanitation, a soil moisture controlled wastewater subsurface drip irrigation (SDI) dispersal system was field tested in the Black Belt Prairie of Alabama, USA. The soil moisture control strategy was designed to regulate wastewater disposal timing according to drain field conditions to prevent hydraulic overloading and corresponding environmental hazard. CW2D/HYDRUS simulation modeling was utilized to explore difficult-to-measure aspects of system performance. While the control system successfully adapted hydraulic loading rate to changing drain field conditions, saturated field conditions during the dormant season presented practical application challenges. The paired field experiment and simulation model demonstrate that soil biofilm growth was stimulated in the vicinity of drip emitters. Although biofilm growth is critical in maintaining adequate COD and removal efficiencies, the efficient removal of biodegradable COD itself by soil biofilm limits denitrification of formed . Furthermore, stimulated soil biofilm growth can create soil clogging around drip emitters, which was discerned in the field experiment along with salt accumulation, both of which were verified by simulation. Comparable modeling of system performance in sand and clay media demonstrate that the placement of soil moisture sensors within the drain field can have pronounced impacts on system hydraulic performance, depending on the soil permeability. Overall, the soil moisture control strategy tested is shown as a viable supplemental technology to promote the environmental sustainability of rural sanitation systems.

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Section: Resultsmentioning

confidence: 99%

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Dougherty

Chen

2021

Chemosphere

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“…At the end of the research, the COD concentrations of the effluent from reactor D and F were 125.49 and 83.14 mg/L, respectively; thus, reactor D satisfied the standard for pollution control on the landfill site of the MSW [28]. A possible explanation is that in the presence of organic compounds, the generated hydroxyl radicals interact with the aromatic and heterocyclic compounds present in the leachate, which favor the formation of small aliphatic chains of carboxylic acids resulting in compounds that are easily assimilated by microorganisms [54]. This result indicates that the photocatalytic reaction degrades the refractory organics into biodegradable organic matter, which can be degraded by the microorganisms in an aged waste reactor [55,56].…”

Section: Photocatalyst Stabilitymentioning

confidence: 89%

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

et al. 2021

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This study explored the performance of TiO2 nanoparticles in combination with aged waste reactors to treat landfill leachate. The optimum conditions for synthesis of TiO2 were determined by a series of characterizations and removal rates of methyl orange. The effect of the ultraviolet irradiation time, amount of the catalyst, and pH on the removal efficiency for the chemical oxygen demand (COD) and color in the leachate was explored to determine the optimal process conditions, which were 500 min, 4 g/L and 8.88, respectively. The removal rates for COD and chroma under three optimal conditions were obtained by the single factor control method: 89% and 70%; 95.56% and 70%; and 85% and 87.5%, respectively. Under optimal process conditions, the overall average removal rates for ammonium nitrogen (NH4+–N) and COD in the leachate for the combination of TiO2 nanoparticles and an aged waste reactor were 98.8% and 32.5%, respectively, and the nitrate (NO3−–N) and nitrite nitrogen (NO2–N) concentrations were maintained at 7–9 and 0.01–0.017 mg/L, respectively. TiO2 nanoparticles before and after the photocatalytic reaction were characterized by emission scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and Fourier transform infrared spectrometry. In addition, TiO2 nanoparticles have excellent recyclability, showing the potential of the photocatalytic/biological combined treatment of landfill leachate. This simulation of photocatalysis-landfilling could be a baseline study for the implementation of technology at the pilot scale.

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“…The abundant denitrifying heterotrophic bacteria in the reaction system can use nitrate and other oxygen-containing mineral nitrogen compounds as the final electron acceptor, and the presence of nitrifying bacteria reduces the content of ammonia nitrogen. In this work, when microorganisms were added to the reactor, after a period of adaptation, the heterologous bacterial culture colonized the environment [33], quickly adapted, multiplied, and formed stable activated sludge [34]. The special microorganisms used in this experiment were effective denitrification and decarburization microorganisms collected from actual wastewater from sewage treatment plants; these organisms may be highly adapted and grow exclusively on nitrogen and carbon sources [35].…”

Section: Discussionmentioning

confidence: 99%

Technology for Upgrading the Tailwater of Municipal Sewage Treatment Plants: The Efficacy and Mechanism of Microbial Coupling for Nitrogen and Carbon Removal

Zhang

Fang

et al. 2021

Water

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The efficient removal of carbon (COD) and nitrogen (NH3-N) is vital to improving tailwater from municipal wastewater treatment plants. In this study, denitrification and decarburization bacteria with stable removal efficiencies were introduced into a membrane bioreactor (MBR) for 45 days of field experiments in a QJ Wastewater Treatment Plant (Hangzhou, China) to enhance carbon and nitrogen removal. After adding the decarbonization microorganisms into the denitrification reactor, COD removal increased from 31.2% to 80.2%, while compared to the same MBR with only denitrification microorganisms, the removal efficiency of NH3-N was greatly increased from 76.8% to 98.6%. The results of microbial analysis showed that the cooccurrence of Proteobacteria and Bacillus with high abundance and diverse bacteria, such as Chloroflexi, with autotrophic decarburization functions might account for the synchronous high removal efficiency for NH3-N and COD. This technology could provide a reference for industrial-scale wastewater treatment with the goal of simultaneous nitrogen and carbon removal.

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Simultaneous nitriﬁcation and denitriﬁcation process using novel surface-modified suspended carriers for the treatment of real domestic wastewater

Cited by 125 publications

References 42 publications

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Degradation of Landfill Leachate Using UV-TiO2 Photocatalysis Combination with Aged Waste Reactors

Technology for Upgrading the Tailwater of Municipal Sewage Treatment Plants: The Efficacy and Mechanism of Microbial Coupling for Nitrogen and Carbon Removal

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