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 …Web

et al., 2020). ese nitrogen removal processes con vert nitrogen pollutants to several di erent o xidation states, and each pr ocess needs special running parameters ( Rahimi et al., 2020 ).Web

In 2015, benthic ammonium fluxes at the monitoring station varied between 75 μmol m⁻² h⁻¹ in spring and were less than 10 μmol m⁻² h⁻¹ in summer. ... Autotrophic nitrogen removal is ...Web

Partial nitrification (PN)-Anammox is considered to be the optimal nitrogen-removal process for municipal sewage following organic carbon and phosphorus recovery. However, under the mainstream sewage conditions of low temperature and low-ammonium concentration, the growth of nitrite-oxidizing bacteria (NOB) in the PN process cannot be …Web

Nitrogen Removal. The usefulness of CANON as an industrial process will be determined by the ability of the system to recover from major disturbances in feed composition. ... AOA, and NOB microorganisms in nitrifying communities was observed (Daims et al., 2015; Arp and Bottomley, 2006). There was no known microorganism capable of performing ...Web

Biological Nitrogen Removal Treatment Systems Considered. Mass-balance results were examined for the four nitrogen-removal treatment systems illustrated in …Web

Zhou, Wu, Zhao, and Wang (Citation 2015) studied the optimal pH ranges for C. vulgaris on nutrient removal and found the optimal pH range for ammonia and nitrogen removal was 7–8. Different results were established by Liang et al. ( Citation 2013 ).Web

Carbon sources can provide electron donors for the growth of microorganisms and are an important factor affecting bacterial growth and nitrogen removal (Chen et al., 2015). In the shake flask culture, the growth and ammonia nitrogen removal characteristics of strain K17 with different carbon sources were studied.Web

However, nitrogen removal performance of strain Y-9 was contrary to P. versutus LYM, which could synchronize ammonium removal with nitrite removal and could not reduce nitrite when nitrite was used as the sole nitrogen source even in presence of enough carbon source . ... 2015; 179:421–428. doi: 10.1016/j.biortech.2014.12.057. ...Web

The biological processes for the removal of nitrogen from wastewater are conventionally used worldwide to control eutrophication. The specific processes used and both processes under development are collectively displayed in Fig. 1 and further discussed in this chapter. An aspect of growing importance common for all bioprocesses is the emission of a …Web

The maximum nitrate removal rate in acetate system was the lowest (80.79 mg N/ (L·h)) and nitrite accumulation occurred when nitrate VLR is lifted to 2400 mg N/ …Web

Compared with the nitrogen removal process by anaerobic denitrification, aerobic denitrification has been proven by practice to have the advantages of simple operation, energy-saving, high efficiency, and low running cost …Web

Stable nitrogen removal rates (NRR) of around 1.4 kg N m(-3) d(-1) were obtained at ambient temperature. Morphological characteristics and analysis of bacterial community …Web

According to the analysis of the coupling relationships of nitrogen transformation functional genes, SNAD is the main nitrogen removal process in a large number of CWs (Li et al., 2015b, Wang et al., 2015). Vegetation, hydraulic retention times (HRT), C/N ratios, and influent nitrogen forms all have effects on the SNAD process.Web

The two-stage SBCWs showed high-efficient nitrogen removal capacity, with effluent total nitrogen (TN) concentration of 3.89 ± 0.62 mg/L and TN removal rate of 81.11 ± 2.92 %. Moreover, high-throughput sequencing revealed that Nitrosomonas (37.5 %) was dominant under optimal condition in W PN and responsible for partial nitrification process.Web

Many factors influence nitrogen removal in agricultural drainage ditches. However, existing research has not fully considered parameter sensitivity analysis of nitro- ... Liu et al. 2015). Many factors affect the nitrogen removal of ditch systems. However, water level, water flow, nitrogen concentration, and SS in ditch are greatly influencedWeb

An average ammonium nitrogen removal efficiency (ARE) and total nitrogen removal efficiency (TNR) of 87.01 and 72.41%, respectively, were obtained. This represents a reliable alternative method of achieving rapid PN/A start-up. ... Huang YT, Lin JG (2015) Start-up of simultaneous partial nitrification, anammox and denitrification (SNAD) process ...Web

Request PDF | On May 31, 2015, Qian Chen and others published Bioaugmentation treatment of municipal wastewater with heterotrophic-aerobic nitrogen removal bacteria in a pilot-scale SBR | Find ...Web

1. Introduction. It is a tendency that discharge quality standards of wastewater treatment plants (WWTPs) are becoming increasingly more stringent to reduce the nitrogen emissions (Zhu et al., 2007; Winkler et al., 2011).Existing nitrogen removal processes are difficult to meet the strict standards in an energy-saving and cost-efficient way.Web

Machat studied the effect of C/N on the biological nitrogen removal of an integrated fixed membrane-activated sludge reactor for nearly half a year. The results showed that when the C/N was ten, the …Web

Advanced nitrogen removal without the addition of external carbon source is challenging in the conventional biological nitrogen removal processes. This study presented a novel anaerobic/aerobic/anoxic sequencing batch reactor (A/O/A SBR) based on endogenous nitrate (NO3−–N) respiration to enhance nitrogen removal. The mean …Web

Introduction With urbanization, a large number of natural green spaces have been replaced by impervious surfaces, which not only contributes to the increase of …Web

Anammox. Anammox or anaerobic ammonium oxidation is a recently studied energy-efficient nitrogen removal process that is gaining popularity. In this process, nitrite and ammonium are used up, resulting in the formation of nitrogen gas along with NO and N 2 H 4 intermediates (Equation (5)).Web

A review. Nitrogen removal from wastewater via anaerobic ammonium oxidn. (anammox)-based process has been recognized as efficient, cost-effective and low energy alternative to the conventional nitrification and denitrification processes.Web

Results and discussion. Strain H7 presented efficient capacities for simultaneous NH 4 +-N, NO 3 −-N, or NO 2 −-N removal with As(III) oxidation during aerobic cultivation.Strikingly, the bacterial ability to remove nitrogen and oxidize As(III) has remained high across a wide range of pH values, and shaking speeds, exceeding that of …Web

In principle, the DN-PN/A process can remove of ammonia nitrogen, but it is difficult to create a balance between the growth of heterotrophic microorganisms and autotrophic microorganisms (AOB, AnAOB, and other microorganisms) in one integrated reactor (Ma et al., 2020).Thus, research needs to be conducted to develop or engineer optimized DN …Web

keywords "wastewater" and "remove nitrogen" found that more than 70,000 articles on wastewater denitrification have been published in the last decade (2012–2021), with the number of ...Web

However, the efficiency of nitrogen removal in the bioretention system is unstable, owing to the different chemical properties of various forms of nitrogen and the limitations of current bioretention system for nitrogen transformation. ... Sahinkaya E, Dursun N (2015) Use of elemental sulfur and thiosulfate as electron sources for water ...Web

Advantages of the deammonification process, including: lessened amount of biomass generation, zero external carbon addition, along with a lowered aeration energy requirement as oxygen provision, against the conventional nitrogen removal processes are indicated in Table 1.Data presented in Table 1 are based on the reported stoichiometry, …Web

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 ... (Camacho et al. 2015). As a result of the health effects of nitrogen, the ...Web

The biological nitrogen removal via nitrification–denitrification is the most commonly used technique for the removal of nitrogen from wastewater during the secondary treatment. More recently anaerobic ammonia oxidation (Anammox) was developed, in which ammonia is oxidized under anoxic conditions using nitrate as …Web

Coupling of biotic and abiotic processes for nitrogen removal has been previously investigated and documented (Nguyen et al., 2015; Deng et al., 2016; Sander et al., 2017). In most bioelectrochemical systems (BESs), anode and cathode chambers are separated by a proton exchange membrane, and the electrodes therein are connected …Web

Low Nitrogen and Phosphorus MARCH 2019 The 2010 Tertiary Denitrification Processes for Low Nitrogen and Phosphorus Compendium was written to identify knowledge gaps to be addressed by the Nutrient Removal Challenge. That document contains state-of-the-art knowledge to achieve reliable, cost-effective nutrient removal. The 2010Web

Introduction. Increasing the nitrification capacity of activated sludge processes to meet lower effluent ammonia-nitrogen (NH 3-N) concentrations, handle higher loadings, and or increase nitrogen removal can require major changes to existing water resource recovery facilities (WRRFs).Limited space and economic considerations may favor …Web

This article reviews nitrogen removal and recovery processes, which may be used for reject water treatment. It presents an overview of their known maximum achieved scale …Web

By the 4th day, nitrogen and organic matter removal in PH-MBBR began to improve indicating bacterial adaption to the water quality (L I) and began to play a role in pollutant removal. As the system gradually stabilized in its efficient removal of nitrogen and organic pollutants, the effluent TN concentration was 12.30 mg/L on day 17, with a COD ...Web

The nitrogenous compounds present in wastewaters create severe biotic stress and alter the biodiversity when discharged into aquatic ecosystems. Biological …Web

The PN/A process has generated a lot of interest from water practitioners leading to the development of over 100 full-scale systems ( Lackner et al., 2014a; …Web

Most previous studies have primarily been single-factor experiments, but simultaneous changes in multiple environmental factors may impact nitrogen removal efficiency (Su et al., 2015). The conventional approach of assessing one factor at a time is not appropriate for this particular bioprocess due to potential interactions between …Web

An orthogonal test was conducted to explore the significance of these four factors and their impacts on nitrogen removal as well as the nitrogen transport characteristics along the ditch. ... Wang, Y., Li, X., Zhang, S. N., Li, Y., & Wu, J. S. (2015). Nitrogen removal in an ecological ditch receiving agricultural drainage in subtropical …Web