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Zhou B, Hou P, Xiao Y, Song P, Xie E, Li Y. Visualizing, quantifying, and controlling local hydrodynamic effects on biofilm accumulation in complex flow paths. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125937. [PMID: 34492866 DOI: 10.1016/j.jhazmat.2021.125937] [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: 01/04/2021] [Revised: 04/18/2021] [Accepted: 04/19/2021] [Indexed: 06/13/2023]
Abstract
Complex flow paths (CFPs) are commonly applied in precision equipment to accurately supply controllable fluids with designed structures. However, the presence of biofilms in CFPs causes quite a few unwanted issues, such as bio-erosion, clogging, or even health risks. To date, visualizing and quantifying the interaction between biofilm distribution and local hydrodynamics remains difficult, and the mechanism during the process is unclear. In this paper, the remodeling simulation method (3D industrial computed tomography scanning-inverse modeling-numerical simulation) and 16S rRNA high-throughput sequencing were integrated. The results indicated that local hydrodynamic characteristics significantly affected biofilm thicknesses on CFP surfaces (relative differences of 41.3-71.2%), which inversely influenced the local turbulence intensity. The average biofilm thicknesses exhibited a significant quadratic correlation with the near-wall hydraulic shear forces (r > 0.72, p < 0.05), and the biofilm reached a maximum thickness at 0.36-0.45 Pa. On the other hand, the near-wall hydraulic shear forces not only affected microbial community characteristics of biofilms, but they also influenced the number of microorganisms involved, which determined the biofilm accumulation thereafter. The PHYLUM Firmicutes and Proteobacteria were the dominant bacteria during the process. The results obtained in this paper could provide practical conceptions for the targeted control of biofilms and put forward more efficient controlling methods in commonly applied CFP systems.
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Affiliation(s)
- Bo Zhou
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - Peng Hou
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - Yang Xiao
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - Peng Song
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - En Xie
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
| | - Yunkai Li
- College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China.
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Zhao W, Vermace RR, Mattes TE, Just C. Impacts of ammonia loading and biofilm age on the prevalence of nitrogen-cycling microorganisms in a full-scale submerged attached-growth reactor. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:787-796. [PMID: 33124148 DOI: 10.1002/wer.1471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 10/04/2020] [Accepted: 10/11/2020] [Indexed: 06/11/2023]
Abstract
This study reports the impacts of seasonal ammonia load changes and biofilm age on the quantity of biomass and on the prevalence of ammonia- and nitrite-metabolizing organisms within a submerged attached-growth reactor (SAGR™) following lagoon treatment. Ammonia (NH3 ) loadings (0.12-3.17 kg/d) in the primary SAGR were measured over 223 days from May to December in 2017. Adjustment of the wastewater flow path on September 1 successfully increased NH3 loading to the primary SAGR, which subsequently caused reactor biomass to increase. The NH3 removal rate in October (0.5 kg/d) was greater than rates in June and July (0.3 and 0.2 kg/d) despite a water temperature decrease from >24 to 15.6°C. This elevated removal rate in October, and the sustained removal rate in December (0.4 kg/d, 5.3°C) were associated with a measured increase in microbial biomass. The relative abundance of the anammox organism C. Brocadia was 5 times greater in the mature biofilm after 686 days of growth, and the genus Pseudomonas increased sevenfold. The presence of Pseudomonas, which contains denitrifying species, and anammox suggests a high potential for removal of total nitrogen in SAGRs. PRACTITIONER POINTS: Pseudomonas prevalence and the presence of anammox suggest a high potential for total nitrogen removal in mature SAGR biofilms. The abundance of the anammox microorganism C. Brocadia was greater after 686 days of biofilm growth compared with 33 days. Simple operational changes can increase biomass in the SAGR to maintain, or even increase, NH3 transformation rates during cold weather.
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Affiliation(s)
- Weilun Zhao
- Civil & Environmental Engineering, University of Iowa, Iowa City, IA, USA
| | - Rebecca R Vermace
- Civil & Environmental Engineering, University of Iowa, Iowa City, IA, USA
| | - Timothy E Mattes
- Civil & Environmental Engineering, University of Iowa, Iowa City, IA, USA
| | - Craig Just
- Civil & Environmental Engineering, University of Iowa, Iowa City, IA, USA
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Microfluidic study of effects of flow velocity and nutrient concentration on biofilm accumulation and adhesive strength in the flowing and no-flowing microchannels. ACTA ACUST UNITED AC 2019; 46:855-868. [DOI: 10.1007/s10295-019-02161-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 03/05/2019] [Indexed: 01/12/2023]
Abstract
Abstract
Biofilm accumulation in porous media can cause pore plugging and change many of the physical properties of porous media. Engineering bioplugging may have significant applications for many industrial processes, while improved knowledge on biofilm accumulation in porous media at porescale in general has broad relevance for a range of industries as well as environmental and water research. The experimental results by means of microscopic imaging over a T-shape microchannel clearly show that increase in fluid velocity could facilitate biofilm growth, but that above a velocity threshold, biofilm detachment and inhibition of biofilm formation due to high shear stress were observed. High nutrient concentration prompts the biofilm growth; however, the generated biofilm displays a weak adhesive strength. This paper provides an overview of biofilm development in a hydrodynamic environment for better prediction and modelling of bioplugging processes associated with porous systems in petroleum industry, hydrogeology and water purification.
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Subramanian M, Srinivasan T, Sudarsanam D. Examining the Gm18 and m(1)G Modification Positions in tRNA Sequences. Genomics Inform 2014; 12:71-5. [PMID: 25031570 PMCID: PMC4099351 DOI: 10.5808/gi.2014.12.2.71] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 03/20/2014] [Accepted: 03/26/2014] [Indexed: 12/30/2022] Open
Abstract
The tRNA structure contains conserved modifications that are responsible for its stability and are involved in the initiation and accuracy of the translation process. tRNA modification enzymes are prevalent in bacteria, archaea, and eukaryotes. tRNA Gm18 methyltransferase (TrmH) and tRNA m1G37 methyltransferase (TrmD) are prevalent and essential enzymes in bacterial populations. TrmH involves itself in methylation process at the 2'-OH group of ribose at the 18th position of guanosine (G) in tRNAs. TrmD methylates the G residue next to the anticodon in selected tRNA subsets. Initially, m1G37 modification was reported to take place on three conserved tRNA subsets (tRNAArg, tRNALeu, tRNAPro); later on, few archaea and eukaryotes organisms revealed that other tRNAs also have the m1G37 modification. The present study reveals Gm18, m1G37 modification, and positions of m1G that take place next to the anticodon in tRNA sequences. We selected extremophile organisms and attempted to retrieve the m1G and Gm18 modification bases in tRNA sequences. Results showed that the Gm18 modification G residue occurs in all tRNA subsets except three tRNAs (tRNAMet, tRNAPro, tRNAVal). Whereas the m1G37 modification base G is formed only on tRNAArg, tRNALeu, tRNAPro, and tRNAHis, the rest of the tRNAs contain adenine (A) next to the anticodon. Thus, we hypothesize that Gm18 modification and m1G modification occur irrespective of a G residue in tRNAs.
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Affiliation(s)
- Mayavan Subramanian
- Synthetic Biology and Biofuel Group, International Center for Genetic Engineering and Biotechnology (ICGEB), New Delhi 110 067, India
| | - Thangavelu Srinivasan
- DST-FIST Bioinformatics and Principal Investigator, School of Genomics and Bioinformatics, Department of Advanced Zoology and Biotechnology, Loyola College, Chennai 600 034, India
| | - Dorairaj Sudarsanam
- DST-FIST Bioinformatics and Principal Investigator, School of Genomics and Bioinformatics, Department of Advanced Zoology and Biotechnology, Loyola College, Chennai 600 034, India
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Shoda M, Ishikawa Y. Heterotrophic nitrification and aerobic denitrification of high-strength ammonium in anaerobically digested sludge by Alcaligenes faecalis strain No. 4. J Biosci Bioeng 2014; 117:737-41. [DOI: 10.1016/j.jbiosc.2013.11.018] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 11/15/2013] [Accepted: 11/29/2013] [Indexed: 10/25/2022]
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Saeed A, Iqbal M. Loofa (Luffa cylindrica) sponge: Review of development of the biomatrix as a tool for biotechnological applications. Biotechnol Prog 2013; 29:573-600. [DOI: 10.1002/btpr.1702] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 11/11/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Asma Saeed
- Environmental Biotechnology Group; Biotechnology and Food Research Centre; Lahore 54600 Pakistan
| | - Muhammad Iqbal
- Environmental Biotechnology Group; Biotechnology and Food Research Centre; Lahore 54600 Pakistan
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Wang F, Liu Y, Wang J, Zhang Y, Yang H. Influence of growth manner on nitrifying bacterial communities and nitrification kinetics in three lab-scale bioreactors. ACTA ACUST UNITED AC 2012; 39:595-604. [DOI: 10.1007/s10295-011-1065-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2011] [Accepted: 11/18/2011] [Indexed: 11/28/2022]
Abstract
Abstract
The effects of growth type, including attached growth, suspended growth, and combined growth, on the characteristics of communities of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) were studied in three lab-scale Anaerobic/Anoxicm-Oxicn (AmOn) systems. These systems amplified activated sludge, biofilms, and a mixture of activated sludge and biofilm (AS-BF). Identical inocula were adopted to analyze the selective effects of mixed growth patterns on nitrifying bacteria. Fluctuations in the concentration of nitrifying bacteria over the 120 days of system operation were analyzed, as was the composition of nitrifying bacterial community in the stabilized stage. Analysis was conducted using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and real-time PCR. According to the DGGE patterns, the primary AOB lineages were Nitrosomonas europaea (six sequences), Nitrosomonas oligotropha (two sequences), and Nitrosospira (one sequence). The primary subclass of NOB community was Nitrospira, in which all identified sequences belonged to Nitrospira moscoviensis (14 sequences). Nitrobacter consisted of two lineages, namely Nitrobacter vulgaris (three sequences) and Nitrobacter alkalicus (two sequences). Under identical operating conditions, the composition of nitrifying bacterial communities in the AS-BF system demonstrated significant differences from those in the activated sludge system and those in the biofilm system. Major varieties included several new, dominant bacterial sequences in the AS-BF system, such as N. europaea and Nitrosospira and a higher concentration of AOB relative to the activated sludge system. However, no similar differences were discovered for the concentration of the NOB population. A kinetic study of nitrification demonstrated a higher maximum specific growth rate of mixed sludge and a lower half-saturation constant of mixed biofilm, indicating that the AS-BF system maintained relatively good nitrifying ability.
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Affiliation(s)
- Feng Wang
- grid.24516.34 0000000123704535 Key Laboratory of Yangtze River Water Environment, Ministry of Education Tongji University 200092 Shanghai China
| | - Yi Liu
- grid.419074.f 0000000417612345 Shanghai Environmental Protection Limited Company Shanghai Academy of Environmental Sciences 200233 Shanghai China
| | - Jinghan Wang
- grid.24516.34 0000000123704535 Key Laboratory of Yangtze River Water Environment, Ministry of Education Tongji University 200092 Shanghai China
| | - Yalei Zhang
- grid.24516.34 0000000123704535 Key Laboratory of Yangtze River Water Environment, Ministry of Education Tongji University 200092 Shanghai China
| | - Haizhen Yang
- grid.24516.34 0000000123704535 Key Laboratory of Yangtze River Water Environment, Ministry of Education Tongji University 200092 Shanghai China
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Constructing multispecies biofilms with defined compositions by sequential deposition of bacteria. Appl Microbiol Biotechnol 2010; 86:1941-6. [DOI: 10.1007/s00253-010-2473-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/25/2010] [Accepted: 01/26/2010] [Indexed: 11/26/2022]
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Zamora-Castro J, Paniagua-Michel J, Lezama-Cervantes C. A novel approach for bioremediation of a coastal marine wastewater effluent based on artificial microbial mats. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2008; 10:181-189. [PMID: 17985186 DOI: 10.1007/s10126-007-9050-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2007] [Revised: 08/21/2007] [Accepted: 08/25/2007] [Indexed: 05/25/2023]
Abstract
A novel alternative for wastewater effluent bioremediation was developed using constructed microbial mats on low-density polyester. This biotechnology showed high removal efficiencies for nitrogen and phosphorous in a short retention time (48 h): 94% for orthophosphate (7.78 g PO(3-)(4) - P m(3) d(-1)), 79% for ammonium (11.30 g NH(4)(+) - N m(-3) d(-1)), 78% for nitrite (7.46 g NO(2)(-) m(-3) d(-1)), and 83% for nitrate (8.55 g NO(3)(-) N m(-3) d(-1)). The microbial mats were dominated by Cyanobacteria genera such as Chroococcus sp., Lyngbya sp., and bacteria of the subclass Proteobacteria representative of the Eubacteria Domain. Nitzschia sp. was the dominant Eukaryote Domain. Various N and P substrates in the wastewater permit the growth of self-forming and self-sustaining bacterial, microalgal, and cyanobacterial communities on a polyester support. The result is the continuous, self-sufficient growth of microbial mats. This is an innovative, economical, and environmentally safe alternative for the treatment of wastewater effluents in coastal marine environments.
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Affiliation(s)
- J Zamora-Castro
- Department of Marine Biotechnology, Centro de Investigación Científica y de Educación Superior de Ensenada, Km 107 Carretera Tijuana-Ensenada, Ensenada, BC, México
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