scholarly journals Modeling sulfide production in full flow concrete sewers based on the HRT variation of sewerage

2021 ◽  
Author(s):  
Junyan Wang ◽  
Xianglong Xu ◽  
Shuai Liu ◽  
Yuting Shao ◽  
Jingbing Zhang ◽  
...  
Keyword(s):  
Empirical Equation ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Power Relationship ◽  
Logarithmic Function ◽  
Monod Equation ◽  
Concrete Pipe ◽  
Sulfide Production ◽  
Practical Model ◽  
And Control

Abstract The corrosion and odor in concrete sewers are mainly related to the sulfide production, which is, under certain circumstances, directly proportional to the hydraulic retention time (HRT) of the sewer. To reduce the corrosion and control the odor in the concrete sewers, it is necessary to model the production of sulfide in the concrete sewers with different HRTs. However, previous researches were mostly carried out in the simulated Perspex-made sewers, and the obtained theoretical formulas based on the Monod equation were impractical because of the complexity. An actual concrete pipe with domestic sewage was employed in this study to obtain a simple but practical model, which can be applied to quantitively describe the sulfide production according to the HRT of the sewer and the COD of the sewage. The empirical equation obtained was rs = (0.045 × lnHRT + 0.071) × ([COD] - b)0.6, the coefficient is a logarithmic function of the HRT, and the sulfide production rate and COD has a power relationship. Based on the data of COD and HRT obtained in the realistic sewer, the production of sulfide in the sewer can be predicted for better maintaining sewer through sulfide control.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

scholarly journals Practical model-free robust estimation and control design for an underwater soft IPMC actuator

2020 ◽  
Vol 14 (11) ◽  
pp. 1508-1515
Author(s):  
Jasim Khawwaf ◽  
Jinchuan Zheng ◽  
Hai Wang ◽  
Zhihong Man
Keyword(s):  
Robust Estimation ◽  
Control Design ◽  
Model Free ◽  
Practical Model ◽  
Estimation And Control ◽  
And Control

A New Method for the Identification of Infiltration Waters in Sanitary Flows

1993 ◽  
Vol 27 (12) ◽  
pp. 227-230 ◽  
Author(s):  
M. A. Verbanck
Keyword(s):  
Domestic Sewage ◽  
Water Infiltration ◽  
New Method ◽  
Clear Water ◽  
Sewer Systems ◽  
And Control

Extraneous clear water infiltration can significantly distort the operation and control of sewer systems. A method using the borate components dissolved in domestic sewage is outlined which enables the scale of any such problems to be well specified.

Damage Causes and Control about Reinforced Concrete Circular Pipe Culvert under the High Fill

2012 ◽  
Vol 256-259 ◽  
pp. 1082-1086
Author(s):  
Jun Zhang ◽  
Xie Dong Zhang ◽  
Xiang Yu Hu
Keyword(s):  
Reinforced Concrete ◽  
Circular Pipe ◽  
Control Methods ◽  
Damage Characteristics ◽  
Concrete Pipe ◽  
And Control

The damages of reinforced concrete pipe culvert appeared in use process brought a lot of problems. Investigated the pipe culvert damage characteristics, analyzed the causes of damages from load, structure stress and production, give the corresponding control methods.

scholarly journals UTILIZAÇÃO DE FORRAGEIRA NO TRATAMENTO DE ESGOTO DOMÉSTICO

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 92-100
Author(s):  
João de Jesus Guimarães ◽  
José Antonio Rodrigues de Souza ◽  
Débora Astoni Moreira ◽  
Ellen Lemes Silva ◽  
João Victor Costa ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Dry Matter ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Dry Mass ◽  
Application Rate ◽  
Domestic Sewage ◽  
Dry Matter Yield ◽  
Matter Production ◽  
Wetland System

UTILIZAÇÃO DE FORRAGEIRA NO TRATAMENTO DE ESGOTO DOMÉSTICO     JOÃO DE JESUS GUIMARÃES 1; JOSÉ ANTONIO RODRIGUES DE SOUZA 2; DÉBORA ASTONI MOREIRA3; ELLEN LEMES SILVA4; JOÃO VICTOR COSTA 5 E MARA LÚCIA CRUZ DE SOUZA6   Departamento de Engenharia Rural - Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu-SP, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Recursos Naturais do Cerrado, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km2.5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Rural - Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu-SP, Brasil, [email protected]     RESUMO   A utilização de forrageiras como vegetação em sistema de tratamento do tipo wetland tem sido estudado como forma de associar harmonia paisagística, eficiência e aproveitamento agrícola, facilitando sua aceitação. Neste estudo, objetivou-se estudar a utilização do o capim tifton 85 (Cynodon sp.) em wetlands. Para isso, avaliou-se a produção de matéria seca quando submetido a diferentes tempos de detenção hidráulico. Os resultados permitiram concluir que o capim tifton 85 mostrou-se adequado à utilização em sistemas de tratamento do tipo wetland, sendo o tempo de detenção hidráulico de dois dias (referente a uma taxa de aplicação superficial de 110 kg ha-1 d-1 de DBO) proporcionou a maior produção de matéria seca e, por consequência, maior de remoção de nutrientes.   Palavras-chave: Cynodon spp., massa seca, sistema alagado construído, água residuária.     GUIMARÃES, J. J.1; SOUZA, J. A. R2; MOREIRA, D. A.3; SILVA, E. L.4; COSTA, J. V.5; SOUZA, M. L. C.6 FORAGE USE IN DOMESTIC SEWAGE TREATMENT     ABSTRACT   The use of forages as vegetation in a wetland system has been studied as a way of associating landscape harmony, efficiency and agricultural utilization, facilitating its acceptance. The objective of this study was to study the use of tifton 85 grass (Cynodon sp.) in wetland systems. For this, the dry matter production was evaluated when subjected to hydraulic retention times. The results allowed to conclude that tifton 85 grass was suitable for use in SAC treatment systems, with a two-day hydraulic retention time (referring to a surface application rate of 110 kg ha-1 d-1 of BOD) provided the highest dry matter yield and, consequently, higher nutrient removal.   Keywords: Cynodon spp., dry mass, wetlands, wastewater.

Comparison of CFD Calculations With Experimental Results for the YMP Scaled Natural Convection Tests

2004 ◽  
Author(s):  
Sandra Dalvit Dunn ◽  
Stephen W. Webb ◽  
John Del Mar ◽  
Michael T. Itamura ◽  
Nicholas D. Francis
Keyword(s):  
Nuclear Waste ◽  
Pilot Scale ◽  
Department Of Energy ◽  
Geologic Repository ◽  
Specific Data ◽  
Concrete Pipe ◽  
High Level Nuclear Waste ◽  
High Level ◽  
And Control ◽  
Calculated Model

The Yucca Mountain Project (YMP) is currently designing a geologic repository for high level nuclear waste. The design encompasses two distinct phases, the pre-closure period where temperatures within the repository will be controlled by active ventilation, and the post-closure period where the repository will be sealed. A prerequisite for designing the repository is the ability to both understand and control the heat generated from the decay of the nuclear waste. This decay heat affects the performance of both the waste packages and the emplacement drift. The ability to accurately model the complex heat transfer within the repository is critical to the understanding of the repository performance. Currently, computational fluid dynamics codes are being used to model the post-closure performance of the repository. Prior to using the codes on the project they were required to be thoroughly validated. Eight pilot-scale tests were performed at the Department of Energy North Las Vegas Atlas Facility to evaluate the processes that govern thermal transport in an environment that scales to the proposed repository environment during the post closure period. The tests were conducted at two geometric scales (25 and 44% of full scale), with and without drip shields, and under both uniform and distributed heat loads. The tests provided YMP specific data for model validation. A separate CFD model was developed for each of the four test configurations. The models included the major components of the experiment, including the waste packages (heated steel canisters), invert floor, and emplacement drift (insulated concrete pipe). The calculated model temperatures of the surfaces and fluids, and velocities, are compared with experimental data.

scholarly journals THE RÔLE OF CERTAIN METALLIC IONS AS OXIDATION CATALYSTS

1926 ◽  
Vol 10 (2) ◽  
pp. 289-312 ◽  
Author(s):  
S. F. Cook
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Empirical Equation ◽  
Initial Rate ◽  
Fractional Power ◽  
Logarithmic Function ◽  
Metallic Ions ◽  
Colloidal State ◽  
Colloidal Metal ◽  
Cadmium Zinc

1. When iron and copper are allowed to act on hydrogen peroxide and pyrogallol, enough carbon dioxide is produced to be readily measured. 2. The curve of the production of carbon dioxide may be fitted by an empirical equation, by the use of which the initial rate and the total amount of the oxidation may be determined. 3. The effect of the concentration of the reagents is different in each case, the effect varying as a fractional power of the copper and pyrogallol concentrations and as a logarithmic function of the hydrogen peroxide concentration. 4. When gold or silver is used the rate changes suddenly during the course of the reaction due to the precipitation of colloidal metal. 5. Mercury, cadmium, zinc, tin, and some other metals have no effect. 6. A theoretical set of equations is assumed to account for the action of the metals. 7. The metals are assumed to act by means of the formation of intermediate peroxides. 8. Experiments on the action of gold indicate that the metals are active in the ionic and not in the colloidal state.

Development of Technology for the Use of the UASB Reactor in Domestic Sewage Treatment

1986 ◽  
Vol 18 (12) ◽  
pp. 109-121 ◽  
Author(s):  
Sonia M. M. Vieira ◽  
Marcos E. Souza
Keyword(s):  
Steady State ◽  
Ambient Temperature ◽  
Initial Phase ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Uasb Reactor ◽  
Technical Feasibility ◽  
Feasible Option ◽  
The Cost

The lack of a simple and economic option for the treatment of sewage created the need to develop and make the UASB reactor adequate for low strength wastes. Thus a UASB reactor with 106 ℓ capacity was built, which was specially designed for sewage treatment. Several treatability tests were conducted with raw and settled domestic sewage, with only A hours of hydraulic retention time. This proved the reactor's technical feasibility in treating raw sewage at ambient temperature in São Paulo. Based on these experiments, the reactor was scaled up to 120 m3 and built for the treatment of raw sewage at ambient temperature. The operation is in its initial phase, and good COD removals are already being observed, although steady state has not been achieved yet. Since the cost of the system was extremely low, it is a feasible option to be applied in this country.

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