Season variation of wastewater treatment characterictic and eukaryotic community structure of down-flow hanging sponge (DHS) reactor applied for post-treatment of UASB reactor treating municipal sewage

2013 ◽  
Vol 69 (7) ◽  
pp. III_257-III_264
Author(s):  
Yuma MIYAOKA ◽  
Masashi HATAMOTO ◽  
Kazuaki SYUTSUBO ◽  
Takashi ONODERA ◽  
Tadashi TAGAWA ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Community Structure ◽  
Post Treatment ◽  
Uasb Reactor ◽  
Municipal Sewage ◽  
Eukaryotic Community

Post-treatment of anaerobic effluents in constructed wetland systems

2001 ◽  
Vol 44 (4) ◽  
pp. 213-219 ◽  
Author(s):  
J. T. de Sousa ◽  
A. C. van Haandel ◽  
A. A.V. Guimarães
Keyword(s):  
Suspended Solids ◽  
Control Unit ◽  
Coarse Sand ◽  
Post Treatment ◽  
Uasb Reactor ◽  
Municipal Sewage ◽  
Nitrogen And Phosphorus ◽  
Treatment Unit ◽  
Hydraulic Load ◽  
Pre Treatment

This papers describes the behaviour of wetlands as a post-treatment unit for anaerobically treated sewage for the removal of organic matter, suspended solids, nutrients (nitrogen and phosphorus) and faecal coliforms. Raw sewage was treated in a UASB reactor with a retention time of 5 h and the effluent was used in four units of wetlands with coarse sand as the medium and operated with different hydraulic loads. Three of the units had emerging macrophytes (Juncus sp), whereas the fourth one was operated as a control unit without plants. During the 12 months of operation, the organic material removal efficiency (measured as COD) was in the range of 79 to 85%, whereas suspended solids removal varied from 48 to 71%. Faecal coliform removal was very high (99,99%); phosphorus was also efficiently removed (average efficiency of 90% for the lowest hydraulic load), but nitrogen removal was only partial (45 to 70% for ammonia and 47 to 70% for TKN). The experimental results clearly show the technical feasibility of using wetlands for treatment of municipal sewage after a pre-treatment in the UASB reactor.

Comparative performance evaluation of full-scale anaerobic and aerobic wastewater treatment processes in Brazil

2009 ◽  
Vol 59 (1) ◽  
pp. 15-22 ◽  
Author(s):  
M. von Sperling ◽  
S. C. Oliveira
Keyword(s):  
Wastewater Treatment ◽  
Statistical Tests ◽  
Full Scale ◽  
Post Treatment ◽  
Uasb Reactor ◽  
Septic Tank ◽  
Actual Behavior ◽  
Treatment Processes ◽  
Aerobic Wastewater Treatment

This article evaluates and compares the actual behavior of 166 full-scale anaerobic and aerobic wastewater treatment plants in operation in Brazil, providing information on the performance of the processes in terms of the quality of the generated effluent and the removal efficiency achieved. The observed results of effluent concentrations and removal efficiencies of the constituents BOD, COD, TSS (total suspended solids), TN (total nitrogen), TP (total phosphorus) and FC (faecal or thermotolerant coliforms) have been compared with the typical expected performance reported in the literature. The treatment technologies selected for study were: (a) predominantly anaerobic: (i) septic tank + anaerobic filter (ST + AF), (ii) UASB reactor without post-treatment (UASB) and (iii) UASB reactor followed by several post-treatment processes (UASB + POST); (b) predominantly aerobic: (iv) facultative pond (FP), (v) anaerobic pond followed by facultative pond (AP + FP) and (vi) activated sludge (AS). The results, confirmed by statistical tests, showed that, in general, the best performance was achieved by AS, but closely followed by UASB reactor, when operating with any kind of post-treatment. The effluent quality of the anaerobic processes ST + AF and UASB reactor without post-treatment was very similar to the one presented by facultative pond, a simpler aerobic process, regarding organic matter.

Salinity is the major driver of the global eukaryotic community structure in fish-canning wastewater treatment plants

2021 ◽  
Vol 290 ◽  
pp. 112623
Author(s):  
David Correa-Galeote ◽  
Alba Roibás ◽  
Anuska Mosquera-Corral ◽  
Belén Juárez-Jiménez ◽  
Jesús González-López ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Community Structure ◽  
Wastewater Treatment Plants ◽  
Eukaryotic Community

Closed DHS system to prevent dissolved methane emissions as greenhouse gas in anaerobic wastewater treatment by its recovery and biological oxidation

2010 ◽  
Vol 61 (9) ◽  
pp. 2407-2415 ◽  
Author(s):  
N. Matsuura ◽  
M. Hatamoto ◽  
H. Sumino ◽  
K. Syutsubo ◽  
T. Yamaguchi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Carbon Dioxide Emissions ◽  
High Performance ◽  
Experimental Period ◽  
Post Treatment ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Two Stage ◽  
Dissolved Methane ◽  
Anaerobic Wastewater Treatment

Anaerobic wastewater treatment has been focused on its eco-friendly nature in terms of the improved energy conservation and reduction in carbon dioxide emissions. However, the anaerobic process discharges unrecovered methane as dissolved methane. In this study, to prevent the emission of dissolved methane from up-flow anaerobic sludge blanket (UASB) reactors used to treat sewage and to recover it as useful gas, we employed a two-stage down-flow hanging sponge (DHS) reactor as a post-treatment of the UASB reactor. The closed DHS reactor in the first stage was intended for the recovery of dissolved methane from the UASB reactor effluent; the reactor could successfully recover an average of 76.8% of the influent dissolved methane as useful gas (containing methane over 30%) with hydraulic retention time of 2 h. During the experimental period, it was possible to maintain the recovered methane concentrations greater than 30% by adjusting the air supply rate. The remaining dissolved methane after the first stage was treated by the next step. The second closed DHS reactor was operated for oxidation of the residual methane and polishing of the remaining organic carbons. The reactor had a high performance and the influent dissolved methane was mostly eliminated to approximately 0.01 mgCOD L−1. The dissolved methane from the UASB reactor was completely eliminated—by more than 99%—by the post-treatment after the two-stage closed DHS system.

scholarly journals The capacity of wastewater treatment plants drives bacterial community structure and its assembly

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Young Kyung Kim ◽  
Keunje Yoo ◽  
Min Sung Kim ◽  
Il Han ◽  
Minjoo Lee ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Community Structure ◽  
Bacterial Community ◽  
Activated Sludge ◽  
Community Assembly ◽  
Bacterial Communities ◽  
Wastewater Treatment Plants ◽  
High Capacity ◽  
Operating Conditions ◽  
Rrna Gene

Abstract Bacterial communities in wastewater treatment plants (WWTPs) affect plant functionality through their role in the removal of pollutants from wastewater. Bacterial communities vary extensively based on plant operating conditions and influent characteristics. The capacity of WWTPs can also affect the bacterial community via variations in the organic or nutrient composition of the influent. Despite the importance considering capacity, the characteristics that control bacterial community assembly are largely unknown. In this study, we discovered that bacterial communities in WWTPs in Korea and Vietnam, which differ remarkably in capacity, exhibit unique structures and interactions that are governed mainly by the capacity of WWTPs. Bacterial communities were analysed using 16S rRNA gene sequencing and exhibited clear differences between the two regions, with these differences being most pronounced in activated sludge. We found that capacity contributed the most to bacterial interactions and community structure, whereas other factors had less impact. Co-occurrence network analysis showed that microorganisms from high-capacity WWTPs are more interrelated than those from low-capacity WWTPs, which corresponds to the tighter clustering of bacterial communities in Korea. These results will contribute to the understanding of bacterial community assembly in activated sludge processing.

scholarly journals Correction: Deep-bed filters as post-treatment for ozonation in tertiary municipal wastewater treatment: impact of design and operation on treatment goals

2021 ◽  
Vol 7 (1) ◽  
pp. 232-232
Author(s):  
Daniel Sauter ◽  
Agata Dąbrowska ◽  
Robert Bloch ◽  
Michael Stapf ◽  
Ulf Miehe ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Post Treatment ◽  
Treatment Goals ◽  
Municipal Wastewater Treatment

Correction for ‘Deep-bed filters as post-treatment for ozonation in tertiary municipal wastewater treatment: impact of design and operation on treatment goals’ by Daniel Sauter et al., Environ. Sci.: Water Res. Technol., 2021, DOI: 10.1039/d0ew00684j.

Investigation of aerobic and anaerobic ammonium-oxidising bacteria presence in a small full-scale wastewater treatment system comprised by UASB reactor and three polishing ponds

2010 ◽  
Vol 61 (3) ◽  
pp. 737-743 ◽  
Author(s):  
J. C. Araujo ◽  
M. M. S. Correa ◽  
E. C. Silva ◽  
A. P. Campos ◽  
V. M. Godinho ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Ammonia Removal ◽  
Treatment System ◽  
Nitrifying Bacteria ◽  
Uasb Reactor ◽  
Anammox Bacteria ◽  
Fluorescence In Situ Hybridisation ◽  
Probable Number ◽  
Sediment Samples ◽  
Wastewater Treatment System

This work applied PCR amplification method and Fluorescence in situ hybridisation (FISH) with primers and probes specific for the anammox organisms and aerobic ammonia-oxidising β-Proteobacteria in order to detect these groups in different samples from a wastewater treatment system comprised by UASB reactor and three polishing (maturation) ponds in series. Seven primer pairs were used in order to detect Anammox bacteria. Positive results were obtained with three of them, suggesting that Anammox could be present in polishing pond sediments. However, Anammox bacteria were not detected by FISH, indicating that they were not present in sediment samples, or they could be present but below FISH detection limit. Aerobic ammonia- and nitrite-oxidising bacteria were verified in water column samples through Most Probable Number (MPN) analysis, but they were not detected in sediment samples by FISH. Ammonia removal efficiencies occurred systematically along the ponds (24, 32, and 34% for polishing pond 1, 2, and 3, respectively) but the major reaction responsible for this removal is still unclear. Some nitrification might have occurred in water samples because some nitrifying bacteria were present. Also Anammox reaction might have occurred because Anammox genes were detected in the sediments, but probably this reaction was too low to be noticed. It is important also to consider that some of the ammonia removal observed might be related to NH3 stripping, associated with the pH increase resulting from the intensive photosynthetic activity in the ponds (mechanism under investigation). Therefore, it can be concluded that more than one mechanism (or reaction) might be involved in the ammonia removal in the polishing ponds investigated in this study.

scholarly journals The role of wastewater treatment plants in surface water contamination by plastic pollutants

2018 ◽  
Vol 45 ◽  
pp. 00054 ◽  
Author(s):  
Bozena Mrowiec
Keyword(s):  
Wastewater Treatment ◽  
Surface Water ◽  
Water Contamination ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Point Sources ◽  
Municipal Sewage ◽  
Municipal Wastewater Treatment ◽  
Surface Water Contamination

The aim of this paper was to review the literature data regarding the physico-chemical characteristic of plastic pollutants discharged with municipal sewage, the practical possibility of removing microplastic particles from wastewater during different treatment steps in WWTPs and the problem of surface water contamination within them. Microplastics (the size range of 1 nm to < 5 mm), have been recognized as an emerging threat, as well as an ecotoxicological and ecological risk for water ecosystems. Municipal wastewater treatment plants (WWTPs) are mentioned as the main point sources of microplastics in an aquatic environment. Microplastic particles can be effectively removed in the primary treatment zones via solids skimming and sludge settling processes. Different tertiary treatment processes such as: gravity sand filtration, discfilter, air flotation and membrane filtration provide substantial additional removal of microplastics, and the efficiency of wastewater treatment process can be at a removal level of 99.9%. Nevertheless, given the large volumes of effluent constantly discharged to receivers, even tertiary level WWTPs may constitute a considerable source of microplastics in the surface water.

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