Vertical and horizontal assemblage patterns of bacterial communities in a eutrophic river receiving domestic wastewater in southeast China

2017 ◽  
Vol 230 ◽  
pp. 469-478 ◽  
Author(s):  
Yan Gao ◽  
Chengcheng Wang ◽  
Weiguo Zhang ◽  
Panpan Di ◽  
Neng Yi ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Domestic Wastewater ◽  
Southeast China ◽  
Eutrophic River

scholarly journals APPLICATION OF THE MODIFIED EBB TO IMPROVE LAKE WATER QUALITY IN HA NOI

2018 ◽  
Vol 55 (4C) ◽  
pp. 186
Author(s):  
Hoang Luong
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Bacterial Communities ◽  
Domestic Wastewater ◽  
Viet Nam ◽  
Residential Areas ◽  
Small Lakes ◽  
Lake Water Quality ◽  
Environmental Materials

The modified Eco-Bio-Block (EBB) has been studied and manufactured in Viet Nam, based on the process of blending friendly environmental materials as activated carbon, zeolite, kazemzite, sand and useful microorganisms. After culturing, bacterial communities in the modified EBB became significant abundant by DGGE analysis of 16S rDNA. The amount of microorganisms in the modified EBB was 107 CFU/g bacteria communities (Prokaryote). After 2 months treatment with the modified EBB, the quality of Khuong Thuong lake water has been significantly improved; the concentration of COD, NH4+, Coliform and Chlorophyll-a are reduced by 65.51 %, 64.28 %, 50 % and 68.42 %, respectively at the location A1. Sensuously, the lake water became brighter and cleaner. The application of the modified EBB to improve the lake water quality was conducted appropriately to the conditions at Vietnam in general and at Hanoi in particular. This research aims at localizing technology and improving efficiency on pond/lake water treatment. Further goal of the modified EBB application is to reduce pollutants in domestic wastewater form residential areas, in ditches, creeks and small lakes in Viet Nam.

scholarly journals Taxonomic and Functional Distribution of Bacterial Communities in Domestic and Hospital Wastewater System: Implications for Public and Environmental Health

Antibiotics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1059
Author(s):  
Ramganesh Selvarajan ◽  
Timothy Sibanda ◽  
Jeevan Pandian ◽  
Kevin Mearns
Keyword(s):  
Antibiotic Resistance ◽  
Environmental Health ◽  
Resistance Genes ◽  
Bacterial Communities ◽  
Antibiotic Resistance Genes ◽  
Domestic Wastewater ◽  
Water Bodies ◽  
Resistant Bacteria ◽  
Hospital Wastewater ◽  
Sequence Coverage

The discharge of untreated hospital and domestic wastewater into receiving water bodies is still a prevalent practice in developing countries. Unfortunately, because of an ever-increasing population of people who are perennially under medication, these wastewaters contain residues of antibiotics and other antimicrobials as well as microbial shedding, the direct and indirect effects of which include the dissemination of antibiotic resistance genes and an increase in the evolution of antibiotic-resistant bacteria that pose a threat to public and environmental health. This study assessed the taxonomic and functional profiles of bacterial communities, as well as the antibiotic concentrations in untreated domestic wastewater (DWW) and hospital wastewater (HWW), using high-throughput sequencing analysis and solid-phase extraction coupled to Ultra-high-performance liquid chromatography Mass Spectrometry (UHPLC–MS/MS) analysis, respectively. The physicochemical qualities of both wastewater systems were also determined. The mean concentration of antibiotics and the concentrations of Cl−, F− and PO43 were higher in HWW samples than in DWW samples. The phylum Firmicutes was dominant in DWW with a sequence coverage of 59.61% while Proteobacteria was dominant in HWW samples with a sequence coverage of 86.32%. At genus level, the genus Exiguobacterium (20.65%) and Roseomonas (67.41%) were predominant in DWW and HWW samples, respectively. Several pathogenic or opportunistic bacterial genera were detected in HWW (Enterococcus, Pseudomonas and Vibrio) and DWW (Clostridium, Klebsiella, Corynebacterium, Bordetella, Staphylocccus and Rhodococcus) samples. Functional prediction analysis indicated the presence of beta-lactam resistance, cationic antimicrobial peptide (CAMP) resistance and vancomycin resistance genes in HWW samples. The presence of these antibiotic resistance genes and cassettes were positively correlated with the presence of pathogens. These findings show the risk posed to public and environmental health by the discharge of untreated domestic and hospital wastewaters into environmental water bodies.

scholarly journals Spatial-Temporal Changes in Removal of Fecal Indicators and Diversity of Bacterial Communities in a Constructed Wetland with Ornamental Plants

2021 ◽  
Vol 11 (9) ◽  
pp. 3875
Author(s):  
Cristina S. C. Calheiros ◽  
Sofia I. A. Pereira ◽  
Albina R. Franco ◽  
Paula M. L. Castro
Keyword(s):  
Constructed Wetland ◽  
Bacterial Communities ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Substrate Surface ◽  
Ornamental Plants ◽  
Domestic Wastewater ◽  
Indicator Organisms ◽  
Fecal Indicators ◽  
Fecal Indicator ◽  
Total Coliforms

The present study was undertaken in a constructed wetland (CW), setup in a tourism house, for domestic wastewater treatment. The influence of season variations on the abundance of fecal indicator organisms (total coliforms and Escherichia coli) in the wastewater and in the substrate and the roots of plants inhabiting the inlet and outlet zones of the CW was evaluated along three consecutive years. The structure and diversity of bacterial communities associated to the CW’s substrate of inlet and outlet zones was also analyzed overtime. Wastewater was characterized for physicochemical and microbiological parameters and the bacterial communities colonizing the substrate surface, were analyzed by Denaturing Gradient Gel Electrophoresis (DGGE). The CW was effective in removing COD, BOD5, TSS, PO43−, NH4+, NO3−, and NO2−. It was also effective in removing fecal indicators, with a generalized decrease of total coliforms and E. coli in the substrate and in the wastewater from inlet to outlet of up to 2–3 log. The structure and composition of bacterial communities associated with the substrate was mainly influenced by the year rather than by the season or the CW zone.

scholarly journals Functional properties of bacterial communities in water and sediment of the eutrophic river-lake system of Poyang Lake, China

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7318 ◽  
Author(s):  
Ze Ren ◽  
Xiaodong Qu ◽  
Wenqi Peng ◽  
Yang Yu ◽  
Min Zhang
Keyword(s):  
Sulfate Reduction ◽  
Water Column ◽  
Nitrogen Metabolism ◽  
Nitrate Reduction ◽  
Bacterial Communities ◽  
Poyang Lake ◽  
Functional Redundancy ◽  
Biogeochemical Processes ◽  
Phosphorus Cycle ◽  
Eutrophic River

In river-lake systems, sediment and water column are two distinct habitats harboring different bacterial communities which play a crucial role in biogeochemical processes. In this study, we employed Phylogenetic Investigation of Communities by Reconstruction of Unobserved States to assess the potential functions and functional redundancy of the bacterial communities in sediment and water in a eutrophic river-lake ecosystem, Poyang Lake in China. Bacterial communities in sediment and water had distinct potential functions of carbon, nitrogen, and sulfur metabolisms as well as phosphorus cycle, while the differences between rivers and the lake were inconspicuous. Bacterial communities in sediment had a higher relative abundance of genes associated with carbohydrate metabolism, carbon fixation pathways in prokaryotes, methane metabolism, anammox, nitrogen fixation, and dissimilatory sulfate reduction than that of water column. Bacterial communities in water column were higher in lipid metabolism, assimilatory nitrate reduction, dissimilatory nitrate reduction, phosphonate degradation, and assimilatory sulfate reduction than that of sediment bacterial communities. Furthermore, the variations in functional composition were closely associated to the variations in taxonomic composition in both habitats. In general, the bacterial communities in water column had a lower functional redundancy than in sediment. Moreover, comparing to the overall functions, bacterial communities had a lower functional redundancy of nitrogen metabolism and phosphorus cycle in water column and lower functional redundancy of nitrogen metabolism in sediment. Distance-based redundancy analysis and mantel test revealed close correlations between nutrient factors and functional compositions. The results suggested that bacterial communities in this eutrophic river-lake system of Poyang Lake were vulnerable to nutrient perturbations, especially the bacterial communities in water column. The results enriched our understanding of the bacterial communities and major biogeochemical processes in the eutrophic river-lake ecosystems.

Response of bacterial communities to environmental changes in a mesoscale subtropical watershed, Southeast China

2014 ◽  
Vol 472 ◽  
pp. 746-756 ◽  
Author(s):  
Anyi Hu ◽  
Xiaoyong Yang ◽  
Nengwang Chen ◽  
Liyuan Hou ◽  
Ying Ma ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Environmental Changes ◽  
Southeast China

scholarly journals New and Fast Method To Quantify Respiration Rates of Bacterial and Plankton Communities in Freshwater Ecosystems by Using Optical Oxygen Sensor Spots

2007 ◽  
Vol 73 (21) ◽  
pp. 6722-6729 ◽  
Author(s):  
Mareike Warkentin ◽  
Heike M. Freese ◽  
Ulf Karsten ◽  
Rhena Schumann
Keyword(s):  
Oxygen Consumption ◽  
Respiration Rate ◽  
Bacterial Communities ◽  
Oxygen Sensor ◽  
Bacterial Isolate ◽  
Freshwater Ecosystems ◽  
New Method ◽  
Fast Method ◽  
Signal Drift ◽  
Eutrophic River

ABSTRACT A new method of respiration rate measurement based on oxygen luminescence quenching in sensor spots was evaluated for the first time for aquatic bacterial communities. The commonly used Winkler and Clark electrode methods to quantify oxygen concentration both require long incubation times, and the latter additionally causes signal drift due to oxygen consumption at the cathode. The sensor spots proved to be advantageous over those methods in terms of precise and quick oxygen measurements in natural bacterial communities, guaranteeing a respiration rate estimate during a time interval short enough to neglect variations in organism composition, abundance, and activity. Furthermore, no signal drift occurs during measurements, and respiration rate measurements are reliable even at low temperatures and low oxygen consumption rates. Both a natural bacterioplankton sample and a bacterial isolate from a eutrophic river were evaluated in order to optimize the new method for aquatic microorganisms. A minimum abundance of 2.2 � 106 respiring cells ml−1 of a bacterial isolate was sufficient to obtain a distinct oxygen depletion signal within 20 min at 20�C with the new oxygen sensor spot method. Thus, a culture of a bacterial isolate from a eutrophic river (OW 144; 20 � 106 respiring bacteria ml−1) decreased the oxygen saturation about 8% within 20 min. The natural bacterioplankton sample respired 2.8% from initially 94% oxygen-saturated water in 30 min. During the growth season in 2005, the planktonic community of a eutrophic river consumed between 0.7 and 15.6 μmol O2 liter−1 h−1. The contribution of bacterial respiration to the total plankton community oxygen consumption varied seasonally between 11 and 100%.

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