What is the Best Biological Process for Nitrogen …
This has been called the completely autotrophic nitrogen removal over nitrite process or CANON. (5) While the anammox CANON process provides similar end results to the nitrification/denitrification and SHARON processes, it could offer a …
Nitrogen removal by a novel heterotrophic nitrification and …
The nitrogen metabolism-associated genes amoA, nirK, and nosZ were identified in TY1. Optimal requirements for growth and nitrogen removal were pH 7, shaking speed of 90 rpm, a C/N ratio of 10, and sodium citrate for the carbon supply. The ability to denitrify at low temperature suggests TY1′s potential for wastewater management.
Editorial: Biological nitrogen removal from low carbon …
In conventional nitrogen removal process, the deep nitrogen removal was realized by nitrification and denitrification for low carbon wastewater with external organic carbon addition, which would lead to higher cost, excessive sludge production and also greenhouse gas emission (Li et al., 2022). Carbon neutrality is an unprecedented …
Biological nitrogen removal from low carbon …
Several low-carbon (C/N ≤ 3) nitrogen removal processes have been developed, including nitritation-denitritation, anammox-mediated processes, …
Deciphering the effects of antibiotics on nitrogen removal …
The hydrogen is used by the autotrophic denitrifying bacteria attached to the electrode surface to complete the nitrate-nitrogen removal (Zhao et al., 2011; Zhao et al., 2012). However, the current efficiency and treatment performance of conventional BERs are limited by the cathode surface area ( Feng et al., 2018 ; Li et al., 2021a ; Sun and ...
Recent Advances in Autotrophic Biological Nitrogen Removal …
Due to carbon source dependence, conventional biological nitrogen removal (BNR) processes based on heterotrophic denitrification are suffering from great bottlenecks. The autotrophic BNR process represented by sulfur-driven autotrophic denitrification (SDAD) and anaerobic ammonium oxidation (anammox) provides a viable …
Nitrogen removal via anammox process in constructed …
In another study [48], highly efficient autotrophic nitrogen removal with a total nitrogen rate of 81.11 ± 2.92 % was realized from low ammonium wastewater in a two-stage sequencing batch constructed wetland (SBCW) via partial nitrification-anammox (PN/A) process wherein the start-up of anammox in SBCW was achieved within a time of …
Anammox with alternative electron acceptors: perspectives for nitrogen …
Anammox is a microbial process driven by autotrophic bacteria, referred to as anammox bacteria, which remove nitrogen contained in wastewater in the form of ammonium (NH 4 +-N) and nitrite (NO 2 −-N) (Mulder 1995).In this process, nitrite serves as electron acceptor combined with ammonium to produce molecular nitrogen (the only …
Incorporation of the sulfur cycle in sustainable nitrogen removal
Abstract. In wastewater treatment systems, sulfur (S) removal processes are generally based on heterotrophic sulfate (SO42−) reduction by sulfate reducing bacteria and S-dependent autotrophic denitrification by sulfur oxidizing bacteria. A combination of either two cycles (N and S) or three cycles (N, S and C) appears to be a viable approach ...
Frontiers | Research progress of novel bio-denitrification …
Hydrogen autotrophic denitrification involves the use of hydrogen bacteria to denitrify and remove nitrogen using H 2 as an electron donor (Dong et al., 2021). It boasts advantages such as high denitrification efficiency, rapid reaction rates, environmental cleanliness, and the ease of removing residual H 2 from water without requiring ...
What is the Best Biological Process for Nitrogen …
Biological Nitrogen Removal Treatment Systems Considered. Mass-balance results were examined for the four nitrogen-removal treatment systems illustrated in Figure 1. Also, seven different biological processes were used in one or more of these systems, including aerobic and anaerobic (methanogenesis) for organic removal, nitrification to …
Membrane Bioreactors for Nitrogen Removal from …
nitrogen removal using MBR are evolving and are better able to represent key process differences in MBRs compared to conventional activated sludge. Although several challenges remain (e.g., membrane fouling, cost, and energy consumption), a number of opportunities ... a series of autotrophic microorganisms under aerobic conditions, and …
Sulfur autotrophic denitrification as an efficient nitrogen …
Introduction. Denitrification that converts nitrate (NO 3 –-N) to nitrogen gas (N 2) is one of the key nitrogen removal processes in wastewater treatment plants (WWTPs) (McCarty, 2018; Salawitch et al., 1985).Conventional denitrification relies greatly on organic carbons (as electron donors for nitrate reduction) and is denoted as …
Bibliometric Analysis of Research Trends Related to Carbon …
The low organic carbon content of municipal wastewater reduces the effectiveness of biological nitrogen removal. Herein, we reviewed recent trends in carbon sources for nitrogen removal during wastewater treatment. A bibliometric analysis using the Science Citation Index Expanded database from the Web of Science was performed …
Frontiers | Nitrogen Removal From Nitrate-Containing …
The hydrogen-based membrane biofilm reactor (MBfR) has been widely applied in nitrate removal from wastewater, while the erratic fluctuation of treatment efficiency is in consequence of unstable operation parameters. In this study, hydrogen pressure, pH, and biofilm thickness were optimized as the key controlling parameters to …
A novel autotrophic denitrification and nitrification …
We undertook a lab-scale evaluation of a novel autotrophic denitrification and nitrification integrated constructed wetland (ADNI-CW) for improved carbon (C), nitrogen (N), and sulfur (S) cycling to treat mariculture wastewater. The process involved an up-flow autotrophic denitrification constructed wetland unit (AD-CW) for sulfate reduction and …
Role of heterotrophic nitrifiers and aerobic denitrifiers in
To date, nitrogen removal in the traditional treatment systems has been achieved either in multiple stages (varying O 2 concentrations) or through alternative aerobic and anoxic phases ... Moreover, the autotrophic AOB and NOB are also seriously inhibited by the presence of high salt concentration ...
A comprehensive review on mixotrophic denitrification …
Further analysis of nitrogen removal pathways found that sulfur autotrophic denitrification was dominant. In addition, SO 4 2− and Fe 2+ generated during nitrogen removal can serve as trace elements to increase the growth rate and chlorophyll content of wetland plants by 50.0% and 34.2%, respectively.
Denitrifying biofilm processes for wastewater
Autotrophic denitrification is a cost-effective process for nitrogen removal with reduced inorganic compounds acting as the electron donor, such as hydrogen and sulfur. Methane could also be used directly as an electron donor to drive denitrification in the methane-based denitrification process.
Recent Advances in Autotrophic Biological Nitrogen …
The SPDA process, coupling SDAD with anammox, allows for complete autotrophic nitrogen removal so that the carbon source could be preserved to the …
Pilot-scale evaluation of anammox-based mainstream nitrogen removal
Autotrophic nitrogen removal from municipal wastewater enables development of energy autarkic wastewater treatment plants. In this study we report the evaluation of the anammox process in a ...
Nitrogen removal from wastewater: A …
The nitrogenous compounds present in wastewaters create severe biotic stress and alter the biodiversity when discharged into aquatic ecosystems. …
Elemental sulfur-driven autotrophic denitrification for advanced
Elemental sulfur-driven autotrophic denitrification (S 0 dAD) was applied in a packed-bed reactor to remove residual nitrogen from raw mature landfill leachate after partial nitritation and anaerobic ammonium oxidation (anammox) (PN/A) pretreatment. The performance and stability of S 0 dAD were evaluated with different NO x − (nitrate and …
Evaluation of nitrogen removal and N
From the above, anammox could occur before sulfite-driven autotrophic denitrification under a favorable pH environment in this study, which was also why sulfite-driven autotrophic denitrification was a minor contributor in the anammox-dominated nitrogen removal system (Table 2).
Autotrophic nitrogen removal and potential …
Anaerobic ammonium oxidation (anammox) is a key process to achieve autotrophic nitrogen removal from wastewater. Four continuous flow biological reactors …
Research progress on enhancing the performance of autotrophic nitrogen …
1. Introduction. Autotrophic nitrogen removal (ANR) is an emerging biological nitrogen removal process developed in recent years that has the advantages of low energy consumption, no need for an organic carbon source, high nitrogen removal efficiency, and low greenhouse gas emissions (Li et al., 2019).The application of the ANR …
A comprehensive review on mixotrophic denitrification …
Compared with heterotrophic and autotrophic denitrification, mixotrophic denitrification is later studied and used. However, mixotrophic denitrification can overcome some shortcomings of the two denitrification processes, such as a high carbon source demand for heterotrophic denitrification and a long start-up time for autotrophic …
Synergy between autotrophic denitrification and Anammox …
After 176 days of operation, the anammox reactor achieved removal efficiencies of ammonia and nitrite at 93.75 % and 99.88 %, respectively, and the total nitrogen removal was 73.16 %. The refined ratios of influent nitrite to ammonia in the range of 1.33–2.66 were found to minimize the effect of the large consumption of nitrite by ...
Simultaneous nitrogen removal and toxicity reduction of …
Autotrophic denitrification or mixotrophic denitrification has attracted much attention for total nitrogen removal in recent years (Di Capua et al., 2019), especially for sulfur-based autotrophic denitrification, in which inorganic sulfur compounds, such as elemental sulfur (S 0), sulfide (S 2-) and thiosulfate (S 2 O 3 2-), have been used as ...
Frontiers | Autotrophic Fe-Driven Biological Nitrogen Removal
Autotrophic denitrification, especially with iron supplements, has become a practical alternative method to enhance nitrogen removal. The complicated interactions between environmental parameters, substrates, and microorganisms significantly affect nitrogen transformation in iron-based CWs and have been the focus of many studies.
