1
|
Statiris E, Dimopoulos T, Petalas N, Noutsopoulos C, Mamais D, Malamis S. Investigating the long and short-term effect of free ammonia and free nitrous acid levels on nitritation biomass of a sequencing batch reactor treating thermally pre-treated sludge reject water. BIORESOURCE TECHNOLOGY 2022; 362:127760. [PMID: 35963489 DOI: 10.1016/j.biortech.2022.127760] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/04/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
This work examined the short and long-term effects of different free ammonia (FA) and free nitrous acid (FNA) levels on (i) acclimatized biomass treating sludge reject water via nitrite in a sequencing batch reactor (SBR) and (ii) non-aclimatized biomass treating municipal wastewater via nitrate in the activated sludge process. In the acclimatized biomass, the threshold for the transition from nitrification to nitritation was the FA increase to 10-20 mgNH3-N/L while the SBR unit showed no inhibition on the ammonia uptake rate (AUR) at FA levels up to 65 mgNH3-N/L. Short-term exposure of the acclimatized biomass on FNA showed that AUR inhibition could be more than 50 % for FNA concentration >10 μgHNO2-N/L. The FNA inhibition results were simulated using non-competitive inhibition kinetics that showed that the inhibition constant corresponding to the FNA concentration that inhibits the process by 50 % (i.e. KiFNA) was much higher in the acclimatized biomass.
Collapse
Affiliation(s)
- E Statiris
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece.
| | - T Dimopoulos
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece
| | - N Petalas
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece
| | - C Noutsopoulos
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece
| | - D Mamais
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece
| | - S Malamis
- Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780-GR Athens, Greece
| |
Collapse
|
2
|
Macías-Pérez LA, Levard C, Barakat M, Angeletti B, Borschneck D, Poizat L, Achouak W, Auffan M. Contrasted microbial community colonization of a bauxite residue deposit marked by a complex geochemical context. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127470. [PMID: 34687997 DOI: 10.1016/j.jhazmat.2021.127470] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/24/2021] [Accepted: 10/06/2021] [Indexed: 06/13/2023]
Abstract
Bauxite residue is the alkaline byproduct generated during alumina extraction and is commonly landfilled in open-air deposits. The growth in global alumina production have raised environmental concerns about these deposits since no large-scale reuses exist to date. Microbial-driven techniques including bioremediation and critical metal bio-recovery are now considered sustainable and cost-effective methods to revalorize bauxite residues. However, the establishment of microbial communities and their active role in these strategies are still poorly understood. We thus determined the geochemical composition of different bauxite residues produced in southern France and explored the development of bacterial and fungal communities using Illumina high-throughput sequencing. Physicochemical parameters were influenced differently by the deposit age and the bauxite origin. Taxonomical analysis revealed an early-stage microbial community dominated by haloalkaliphilic microorganisms and strongly influenced by chemical gradients. Microbial richness, diversity and network complexity increased significantly with the deposit age, reaching an equilibrium community composition similar to typical soils after decades of natural weathering. Our results suggested that salinity, pH, and toxic metals affected the bacterial community structure, while fungal community composition showed no clear correlations with chemical variations.
Collapse
Affiliation(s)
- Luis Alberto Macías-Pérez
- Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France; Aix Marseille Univ, CEA, CNRS, BIAM, LEMIRE, Laboratory of Microbial Ecology of the Rhizosphere, ECCOREV FR 3098, F-13108 St-Paul-lez-Durance, France.
| | - Clément Levard
- Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France.
| | - Mohamed Barakat
- Aix Marseille Univ, CEA, CNRS, BIAM, LEMIRE, Laboratory of Microbial Ecology of the Rhizosphere, ECCOREV FR 3098, F-13108 St-Paul-lez-Durance, France.
| | - Bernard Angeletti
- Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France.
| | - Daniel Borschneck
- Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France.
| | | | - Wafa Achouak
- Aix Marseille Univ, CEA, CNRS, BIAM, LEMIRE, Laboratory of Microbial Ecology of the Rhizosphere, ECCOREV FR 3098, F-13108 St-Paul-lez-Durance, France.
| | - Mélanie Auffan
- Aix Marseille Université, CNRS, IRD, INRAE, Collège de France, CEREGE, Technopôle de l'Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France; Civil and Environmental Engineering, Duke University, Durham, NC 27708, USA.
| |
Collapse
|
3
|
Quantifying potential N turnover rates in hypersaline microbial mats by 15N tracer techniques. Appl Environ Microbiol 2021; 87:AEM.03118-20. [PMID: 33579680 PMCID: PMC8091114 DOI: 10.1128/aem.03118-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Microbial mats, due to stratification of the redox zones, have a potential to include a complete N cycle, however an attempt to evaluate a complete N cycle in these ecosystems has not been yet made. In this study, occurrence and rates of major N cycle processes were evaluated in intact microbial mats from Elkhorn Slough, Monterey Bay, CA, USA, and Baja California Sur, Mexico under oxic and anoxic conditions using 15N-labeling techniques. All of the major N transformation pathways, with the exception of anammox, were detected in both microbial mats. Nitrification rates were found to be low at both sites for both seasons investigated. The highest rates of ammonium assimilation were measured in Elkhorn Slough mats in April and corresponded to high in situ ammonium concentration in the overlying water. Baja mats featured higher ammonification than ammonium assimilation rates and this, along with their higher affinity for nitrate compared to ammonium and low dissimilatory nitrate reduction to ammonium rates, characterized their differences from Elkhorn Slough mats. Nitrogen fixation rates in Elkhorn Slough microbial mats were found to be low implying that other processes such as recycling and assimilation from water are main sources of N for these mats at the times sampled. Denitrification in all of the mats was incomplete with nitrous oxide as end product and not dinitrogen. Our findings highlight N cycling features not previously quantified in microbial mats and indicate a need of further investigations in these microbial ecosystems.Importance: Nitrogen is essential for life. The nitrogen cycle on Earth is mediated by microbial activity and has had a profound impact on both the atmosphere and the biosphere throughout geologic time. Microbial mats, present in many modern environments, have been regarded as living records of the organisms, genes, and phylogenies of microbes, as they are one of the most ancient ecosystems on Earth. While rates of major nitrogen metabolic pathways have been evaluated in a number of ecosystems, it remains elusive in microbial mats. In particular it is unclear what factors affect nitrogen cycling in these ecosystems and how morphological differences between mats impact nitrogen transformations. In this study we investigate nitrogen cycling in two microbial mats having morphological differences. Our findings provide insight for further understanding of biogeochemistry and microbial ecology of microbial mats.
Collapse
|
4
|
González-Cortés JJ, Almenglo F, Ramírez M, Cantero D. Effect of two different intermediate landfill leachates on the ammonium oxidation rate of non-adapted and adapted nitrifying biomass. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 281:111902. [PMID: 33421933 DOI: 10.1016/j.jenvman.2020.111902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 11/19/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
A widely employed approach to minimize the detrimental effect of landfill leachates (LL) on nitrifying biomass is to adapt it to these contaminated effluents prior to use. In the study reported here the impact of different intermediate landfill leachates (intermediate 1 (ILL1) and intermediate 2 (ILL2)) and synthetic medium (SM) on the nitritation rates of non-adapted and adapted nitrifying biomass were evaluated and modeled. The models, based on previously reported models (Haldane, Edwards and Aiba), considered the effect of three different heavy metals (Cu, Ni and Zn) present in both landfill leachates. The proposed models fitted well with the different biomasses. The highest specific substrate oxidation rate (qS) of the present study (41.85 ± 1.09 mg N-NH4+ g TSS-1 h-1) was obtained by the non-adapted biomass using SM. The non-adapted biomass was characterized by ~5- and ~28-fold higher nitritation rates on using the different ammonium sources tested (SM, ILL1 and ILL2) when compared to the other biomasses adapted to ILL1 (~9 mg N-NH4+ g TSS-1 h-1) and ILL2 (~1.3 mg N-NH4+ g TSS-1 h-1), respectively. The calculated inhibition constants indicate that the inhibitory effect of the heavy metals followed the order Ni>Zn>Cu. The results reported here bring into question the commonly accepted idea that an adaptation period of the biomass is required to treat landfill leachate.
Collapse
Affiliation(s)
- J Joaquín González-Cortés
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, Av. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain.
| | - Fernando Almenglo
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, Av. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain.
| | - Martín Ramírez
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, Av. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain.
| | - Domingo Cantero
- Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, Av. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain.
| |
Collapse
|
5
|
Lin L, Pratt S, Crick O, Xia J, Duan H, Ye L. Salinity effect on freshwater Anammox bacteria: Ionic stress and ion composition. WATER RESEARCH 2021; 188:116432. [PMID: 33068907 DOI: 10.1016/j.watres.2020.116432] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 08/04/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
The biggest challenge to apply Anammox to treat wastewater with elevated salt content is the inhibitory effect of salinity on freshwater Anammox bacteria (FAB). Most of the research into salinity inhibition has focused on the osmotic pressure effect, while the inhibitory effect and its mechanisms induced by ion composition are poorly understood. In this study, the individual and combined effect of NaCl, KCl and Na2SO4 on FAB (>99% belonging to Ca. Brocadia genera) were systematically investigated by batch tests. The corresponding responses of mRNA abundance of three functional genes (including nitrite reductase gene (nirS), hydrazine synthase gene (hzsB) and hydrazine dehydrogenase gene (hdh)) under different salt conditions were analyzed. The results indicated that NaCl, KCl and Na2SO4 have different inhibition effects, with the 50% inhibition at 0.106, 0.096 and 0.063 M, respectively. The combined inhibition of NaCl+KCl and NaCl+Na2SO4 on FAB were both synergistic; while the combined inhibition of NaCl+KCl+Na2SO4 was additive. The responses of mRNA (of genes: nirS, hzsB and hdh) suggested NaCl inhibited the transport of ammonium; Na2SO4 inhibited both nitrite and ammonium transport; high salinity inhibited functional enzyme activity. These results suggest both ionic stress and ion composition contributed to the observed inhibition.
Collapse
Affiliation(s)
- Limin Lin
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Steven Pratt
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Oliver Crick
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Jun Xia
- Advanced Water Management Centre (AWMC), The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Haoran Duan
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Liu Ye
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
| |
Collapse
|
6
|
Noriega-Hevia G, Mateo O, Maciá A, Lardín C, Pastor L, Serralta J, Bouzas A. Experimental sulphide inhibition calibration method in nitrification processes: A case-study. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 274:111191. [PMID: 32798849 DOI: 10.1016/j.jenvman.2020.111191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 07/27/2020] [Accepted: 08/01/2020] [Indexed: 06/11/2023]
Abstract
Sulphide is one of the inhibitors in the nitrification process in WWTP in regions with sulphate rich soils. As little information is currently available on sulphide nitrification inhibition, the aim of this study was to develop a method based on a modification of the Successive Additions Method to calibrate the effect of sulphide on the activity of ammonia-oxidising bacteria (AOB) and nitrite-oxidising bacteria (NOB). The developed method was then applied to activated sludge samples from two WWTPs with different influent sulphide concentrations. In both cases, sulphide had a greater inhibitory effect on NOB than AOB activity. The sulphide inhibition was found to be lower in the activated sludge fed with sulphide-rich wastewater. The AOB and NOB activity measured at different sulphide concentrations could be accurately modelled with the Hill inhibition equation.
Collapse
Affiliation(s)
- G Noriega-Hevia
- CALAGUA, Unidad Mixta UV-UPV, Institut Universitari D'Investigació D'Enginyeria de L'Aigua I Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera S/n, 46022, València, Spain.
| | - O Mateo
- CALAGUA, Unidad Mixta UV-UPV, Institut Universitari D'Investigació D'Enginyeria de L'Aigua I Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera S/n, 46022, València, Spain
| | - A Maciá
- Depuración de Aguas Del Mediterráneo (DAM), Avenida Benjamín Franklin, 21. 46980 Parque Tecnológico, Paterna, Valencia, Spain
| | - C Lardín
- Entidad Regional de Saneamiento y Depuración de Aguas Residuales de La Región de Murcia (ESAMUR), C/Santiago Navarro, 4. Complejo Espinardo. 30.100, Espinardo, Murcia, Spain
| | - L Pastor
- Depuración de Aguas Del Mediterráneo (DAM), Avenida Benjamín Franklin, 21. 46980 Parque Tecnológico, Paterna, Valencia, Spain
| | - J Serralta
- CALAGUA, Unidad Mixta UV-UPV, Institut Universitari D'Investigació D'Enginyeria de L'Aigua I Medi Ambient, IIAMA, Universitat Politècnica de València, Camí de Vera S/n, 46022, València, Spain
| | - A Bouzas
- CALAGUA, Unidad Mixta UV-UPV, Departament D'Enginyeria Química, Universitat de València, Avinguda de La Universitat S/n, 46100, Burjassot, València, Spain
| |
Collapse
|
7
|
Keerio HA, Bae W, Park J, Kim M. Substrate uptake, loss, and reserve in ammonia-oxidizing bacteria (AOB) under different substrate availabilities. Process Biochem 2020. [DOI: 10.1016/j.procbio.2019.12.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
8
|
Lin L, Pratt S, Rattier M, Ye L. Individual and combined effect of salinity and nitrite on freshwater Anammox bacteria (FAB). WATER RESEARCH 2020; 169:114931. [PMID: 31669901 DOI: 10.1016/j.watres.2019.114931] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 06/13/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
Anaerobic ammonium oxidation (Anammox) based technology has potential for nitrogen removal from wastewater with high salinity, but both salt and nitrite (a substrate for Anammox) have negative effect on microbial activity. In order to achieve Anammox in saline wastewater treatment, it is essential to understand the combined effect of these two components. In this study, the individual and combined effect of salinity and nitrite on fixed film freshwater Anammox bacteria (FAB, mainly belonging to the Ca. Brocadia genus), enriched on carriers from a 1500 L pilot scale one-stage (PN/Anammox) moving bed bioreactor (MBBR), were systematically investigated by 57 pre-designed batch tests. The combined inhibition of nitrite and salinity was determined by comparing with additive and independent inhibition models. With salinity only, the specific Anammox activity (SAA) decreased with increasing salinity: 14.6 mS/cm (about 9.1 g NaCl/L) of salinity caused 50% inhibition (IC50). With nitrite only, SAA started to decrease when nitrite concentration was above 450 mg N/L (threshold) and decreased with increased nitrite (IC50 = 666 mg N/L) thereafter. Significantly, when both salinity and nitrite were elevated, both the threshold and IC50 of nitrite were reduced, with inhibition enhanced. Analysis showed that at high salinity (>14.6 mS/cm) and nitrite concentration (>666 mg N/L), inhibition was close to that predicted by simulation of additive and independent inhibition models. Within a salinity range of 4-14.6 mS/cm and nitrite concentration range of 50-666 mg N/L, the combined inhibition was more severe than prediction (p < 0.05) based on the additive and independent inhibition models and therefore it was determined to be synergistic inhibition.
Collapse
Affiliation(s)
- Limin Lin
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia
| | - Steven Pratt
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia
| | - Maxime Rattier
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia
| | - Liu Ye
- School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia.
| |
Collapse
|
9
|
Pan KL, Gao JF, Li DC, Fan XY. The dominance of non-halophilic archaea in autotrophic ammonia oxidation of activated sludge under salt stress: A DNA-based stable isotope probing study. BIORESOURCE TECHNOLOGY 2019; 291:121914. [PMID: 31377507 DOI: 10.1016/j.biortech.2019.121914] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/22/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
Dynamics of nitrification activity, ammonia-oxidizing archaea (AOA) and bacteria (AOB) abundance and active ammonia oxidizers of activated sludge were explored under different salinities. Results showed that specific ammonium oxidation rates were significantly negative with increasing salinity. The responses of AOA and AOB populations to salt stress were distinct. AOA abundance decreased at moderate salinities (2.5, 5 and 7 g L-1) and increased at high salinities (10, 15, 20 and 30 g L-1), while AOB abundance showed opposite tendency. DNA-based stable isotope probing assays indicated AOA exclusively dominated active ammonia oxidation of test samples under different salinities. The active AOA communities retrieved were all non-halophilic and regulated by salinities. Candidatus Nitrosocosmicus exaquare and Ca. Nitrosocosmicus franklandus were the predominantly active AOA in both salt-free and salt-containing microcosms, while 13C-labeled Nitrososphaera viennensis and Ca. Nitrososphaera gargensis were only retrieved from the microcosms amended with 0 and 30 g L-1 salinity, respectively.
Collapse
Affiliation(s)
- Kai-Ling Pan
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Jing-Feng Gao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
| | - Ding-Chang Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Xiao-Yan Fan
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| |
Collapse
|
10
|
Cui YW, Zhang HY, Ding JR, Peng YZ. The effects of salinity on nitrification using halophilic nitrifiers in a Sequencing Batch Reactor treating hypersaline wastewater. Sci Rep 2016; 6:24825. [PMID: 27109617 PMCID: PMC4843016 DOI: 10.1038/srep24825] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 04/05/2016] [Indexed: 11/16/2022] Open
Abstract
With annual increases in the generation and use of saline wastewater, the need to avoid environmental problems such as eutrophication is critical. A previous study identified ways to start up a halophilic sludge domesticated from estuarine sediments to remove nitrogen from wastewater with a salinity of 30 g/L. This investigation expands that work to explore the impact of salinity on nitrogen removal. This study demonstrated that the mixed halophilic consortia removed nitrogen from wastewater with a salinity of 30–85 g/L. A kinetic analysis showed that halophilic nitrifiers selected based on hypersalinity were characterized by low Ks, μmax and specific ammonium oxidization rates. This explains the decrease in ammonium removal efficiency in the high salinity operational phases. Salinity inhibited ammonia oxidizing bacteria (AOB) activity, as well as the number of dominant AOB, but did not significantly affect the AOB dominant species. Three most dominant AOB lineages in the halophilic sludge were Nitrosomonas marina, Nitrosomonas europaea, and Nitrosococcus mobilis. Nitrosomonas europaea and Nitrosococcus mobilis were mainly affected by salinity, while nitrite accumulation and ammonia loading played the key role in determining the abundance of Nitrosococcus mobilis and Nitrosococcus europaea. The study contributes insights about shifts in halophilic nitrifying bacterial populations.
Collapse
Affiliation(s)
- You-Wei Cui
- Beijing University of Technology, College of Energy and Environmental Engineering, 100 Pingleyuan, Chaoyang District, Beijing 100124, China
| | - Hong-Yu Zhang
- Beijing University of Technology, College of Energy and Environmental Engineering, 100 Pingleyuan, Chaoyang District, Beijing 100124, China
| | - Jie-Ran Ding
- Beijing University of Technology, College of Energy and Environmental Engineering, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.,Environmental Management College of China, 8 Road of Jingang, Beidaihe District, Qinhuangdao 066102, China
| | - Yong-Zhen Peng
- Beijing University of Technology, College of Energy and Environmental Engineering, 100 Pingleyuan, Chaoyang District, Beijing 100124, China
| |
Collapse
|
11
|
Jiménez E, Giménez JB, Seco A, Ferrer J, Serralta J. Effect of pH, substrate and free nitrous acid concentrations on ammonium oxidation rate. BIORESOURCE TECHNOLOGY 2012; 124:478-484. [PMID: 23013925 DOI: 10.1016/j.biortech.2012.07.079] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Revised: 07/13/2012] [Accepted: 07/22/2012] [Indexed: 06/01/2023]
Abstract
Respirometric techniques have been used to determine the effect of pH, free nitrous acid (FNA) and substrate concentration on the activity of the ammonium oxidizing bacteria (AOB) present in an activated sludge reactor. With this aim, bacterial activity has been measured at different pH values (ranging from 6.2 to 9.7), total ammonium nitrogen concentrations (ranging from 0.1 to 10 mg TAN L(-1)) and total nitrite concentrations (ranging from 3 to 43 mg NO(2)-NL(-1)). According to the results obtained, the most appropriate kinetic expression for the growth of AOB in activated sludge reactors has been established. Substrate half saturation constant and FNA and pH inhibition constants have been obtained by adjusting model predictions to experimental results. Different kinetic parameter values and different Monod terms should be used to model the growth of AOB in activated sludge processes and SHARON reactors due to the different AOB species that predominate in both systems.
Collapse
Affiliation(s)
- E Jiménez
- Instituto de Ingeniería del Agua y Medio Ambiente, Universidad Politécnica de Valencia, Valencia, Spain
| | | | | | | | | |
Collapse
|
12
|
Aslan S, Simsek E. Influence of salinity on partial nitrification in a submerged biofilter. BIORESOURCE TECHNOLOGY 2012; 118:24-29. [PMID: 22695142 DOI: 10.1016/j.biortech.2012.05.057] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 05/12/2012] [Accepted: 05/14/2012] [Indexed: 06/01/2023]
Abstract
Partial nitrification under various concentrations of NaCl (0-40 g/l) at a constant operational condition was investigated in a submerged biofilter reactor. The highest NO(2)-N/NO(x)-N ratio (0.76) was achieved at the NLR of 830 g NH(4)-N/m(3) day with salt free wastewater. Small increase the salt content led to higher activities and the NH(4)-N removal efficiency increased from 92% to 95% at 1 g/l NaCl concentration. Over this concentration, each NaCl addition provoked the NH(4)-N oxidation and a sharp increase of inhibition was observed. The total oxidized NH(4)-N was achieved at the nitrogen loading rate (NLR) and surface loading rate (SLR) of 0.754 kg/m(3)day and 3.23 g/m(2) day, respectively without salt in the feed wastewater and it was decreased to 0.322 kg/m(3) day and 1.38 g/m(2) day at the salinity of 40 g/l in the PNBR.
Collapse
Affiliation(s)
- Sukru Aslan
- Cumhuriyet University, Department of Environmental Engineering, 58140 Sivas, Turkey.
| | | |
Collapse
|
13
|
Sudarno U, Winter J, Gallert C. Effect of varying salinity, temperature, ammonia and nitrous acid concentrations on nitrification of saline wastewater in fixed-bed reactors. BIORESOURCE TECHNOLOGY 2011; 102:5665-5673. [PMID: 21414774 DOI: 10.1016/j.biortech.2011.02.078] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 02/17/2011] [Accepted: 02/18/2011] [Indexed: 05/30/2023]
Abstract
Nitrification under changing salinities (0-9%), temperatures (6-50°C), ammonia (0-5 g NL(-1)) and nitrite concentrations (0-0.4 g NL(-1)) was investigated in fixed-bed reactors. For all conditions ammonia oxidation rates (AOR) were lower than nitrite oxidation rates (NOR). AORs and NORs increased from 12.5 to 40°C and were very low at 6°C and almost zero at 50°C. No recovery of nitrification was obtained after incubation at 50°C, whereas nitrification was restorable after incubation at 6°C. Ammonia concentrations of 5 g NL(-1) or nitrite concentrations up to 0.125 g NL(-1) decreased AOR to almost zero. AORs and NORs recovered if ammonia or nitrite was removed. At concentrations of 1 and 5 g NL(-1) ammonia AOR and NOR were inhibited by 50%, whereas 27 mg N/L nitrite inhibited AOR by 50%.
Collapse
Affiliation(s)
- U Sudarno
- Institute of Biology for Engineers and Biotechnology of Wastewater Treatment KIT, Karlsruhe Institute of Technology Germany, 76131 Karlsruhe Am Fasanengarten, Germany
| | | | | |
Collapse
|