Impact of Operational Parameters and Reservoir Variables during the Start-up Phase of a SAGD Process

2005 ◽  
Author(s):  
Jose Walter Vanegas ◽  
Luciane Bonet Cunha ◽  
Francisco J.S. Alhanati
Keyword(s):  
Operational Parameters ◽  
Start Up

scholarly journals Influence of operational parameters on the start-up of a flocculation airlift bioreactor

1994 ◽  
Vol 2 (1-3) ◽  
pp. 181-188 ◽  
Author(s):  
M.Luísa Sousa ◽  
Manuel Mota ◽  
José A. Teixeira
Keyword(s):  
Airlift Bioreactor ◽  
Operational Parameters ◽  
Start Up

scholarly journals Start Up of a UASB Treating Malted Ingredient Manufacturing Wastewater

2018 ◽  
Vol 7 (2) ◽  
pp. 1 ◽  
Author(s):  
Ryland Cairns ◽  
Paul Mead
Keyword(s):  
Manufacturing Industry ◽  
Dairy Wastewater ◽  
Plant Performance ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Biological Interactions ◽  
Operational Parameters ◽  
Start Up ◽  
Stable Conditions

With a greater push to achieve waste management and renewable energy targets technologies such as anaerobic digestion (AD) have increased in popularity. One such technology option is the Upflow Anaerobic Sludge Blanket (UASB) reactor, these have been shown to be a particularly robust option for high strength organic wastewaters, such as those generated by the malted ingredient manufacturing industry. Despite their effectiveness they are reported to have lengthy and complex start ups due to the range of physiochemical and biological interactions influencing sludge blanket stability. This process can be sped up by seeding the plant from sludge from similar plants, however this is not always possible. This paper aims to investigate the start up of a full-scale mesophilic UASB treating malted ingredient wastewater that was initially seeded with a granular sludge treating dairy wastewater. Operational performance during the first 75 days of start up was comparable to that of a fully established plant with a COD removal efficiency in excess of 81.89% and a biogas methane concentration greater than 57.24%. During this period the plant remained operationally robust with the Organic Loading Rates (OLR) exuding the greatest influence on plant performance. Similar to operations during stable conditions key operational parameters such as HRT times, temperatures and pH did not exert a strong influence on the plant. 

Performance of microbial electrolysis cells with bioanodes grown at different external resistances

2015 ◽  
Vol 73 (5) ◽  
pp. 1129-1135 ◽  
Author(s):  
Laura Rago ◽  
Nuria Monpart ◽  
Pilar Cortés ◽  
Juan A. Baeza ◽  
Albert Guisasola
Keyword(s):  
H2 Production ◽  
Current Intensity ◽  
Electrolysis Cell ◽  
Operational Parameters ◽  
External Resistance ◽  
Microbial Electrolysis Cells ◽  
Start Up ◽  
Electrolysis Cells ◽  
Microbial Electrolysis

Bioelectrochemical systems need an anode with a high abundance of exoelectrogenic bacteria for an optimal performance. Among all possible operational parameters for an efficient enrichment, the role of external resistance in microbial fuel cell (MFC) has gained a lot of interest since it indirectly poises an anode potential, a key parameter for biofilm distribution and morphology. Thus, this work aims at investigating and discussing whether bioanodes selected at different external resistances under MFC operation present different responses under both MFC and microbial electrolysis cell (MEC) operation. A better MEC performance (i.e. shorter start-up time, higher current intensity and higher H2 production rate) was obtained with an anode from an MFC developed under low external resistance. Quantitative real-time polymerase chain reaction (qPCR) confirmed that a low external resistance provides an MFC anodic biofilm with the highest content of Geobacter because it allows higher current intensity, which is correlated to exoelectrogenic activity. High external resistances such as 1,000 Ω led to a slower start-up time under MEC operation.

Effect of addition of an exogenous exopolymeric substance in UASB and EGSB reactors

2006 ◽  
Vol 54 (2) ◽  
pp. 25-31 ◽  
Author(s):  
E. Vivanco ◽  
A. Puñal ◽  
R. Chamy
Keyword(s):  
Relative Abundance ◽  
Extracellular Polymeric Substances ◽  
Operational Performance ◽  
Microbial Populations ◽  
Unstable State ◽  
Operational Parameters ◽  
Start Up ◽  
Exopolymeric Substance ◽  
Granule Maturation

The operation of two different reactor configurations (UASB and EGSB), while treating medium and low concentrated wastewater (MCW and LCW, respectively), was studied. The MCW (5 g COD/l) was initially supplied for reactor start up and granule maturation, being subsequently changed to the LCW (0.5 g COD/l), with which led the reactors to an unstable state associated with the deterioration of granule characteristics, in terms of extracellular polymeric substances (EPS) content and composition. The addition of pectin as an exogenous EPS was considered as a way to directly act on granule characteristics and its effect was studied by monitoring the operational parameters as well as by following the EPS content and composition within granules and the dynamics of microbial populations. The effect of adding pectin led to a significant recuperation of the operational performance in both reactors, associated with the increase in Archaea relative abundance, this likely related to the major presence of Methanosaeta-like microorganisms in granules with higher activity and stability.

Operational parameters required for the start-up process of a biofilter to remove Fe, Mn, and NH3-N from low-temperature groundwater

2014 ◽  
Vol 57 (8) ◽  
pp. 3588-3596 ◽  
Author(s):  
Yan’an Cai ◽  
Dong Li ◽  
Yuwen Liang ◽  
Huiping Zeng ◽  
Jie Zhang
Keyword(s):  
Low Temperature ◽  
Operational Parameters ◽  
Start Up

Performance Assessment of a Transient Model for HRSGs in Combined Cycle Power Plants

2003 ◽  
Author(s):  
Sepehr Sanaye ◽  
Arash Moradi ◽  
Farid Bashiri ◽  
Amir Saeed Dashti ◽  
Daryoush Mehranian ◽  
...  
Keyword(s):  
Power Plants ◽  
Performance Test ◽  
Cold Start ◽  
Combined Cycle ◽  
Operational Parameters ◽  
Transient Model ◽  
Water Steam ◽  
Operational Conditions ◽  
Start Up ◽  
Transient And Steady State

Heat Recovery Steam Generators (HRSGs) are major Componets in Combined Cycle Power Plants (CCPPs) which are particulary subject to severe thermal and flow stresses specially during cold start-up period. Hence it is important to predict the operational parameters of HRSGs such as temperature of steam, water steam, water, tube metal and flue gas at various parts sections during the transient operation as well as steady sate conditions. In this paper, the transient model proposed by Pasha and Jolly et al. [2,3] has been selected and developed as a program (HRSG) to predict the operational conditions of the whole HRSG elements during transient and steady state operations. The program is able to analyze arbitrary number of pressure levels and any number of elements such as superheater, evaporator, economizer, deaerator and desuperheater. To assess the correct performance of the developed model and program, and to predict the capability of the method in predicting variations of temperature with time at various elements, three groups of data verifications were performed. First, the numerical outputs were checked against the same outputs reported by Jolly et al. [3]. Second, the theoretical results were checked with experimental data obtained for HRSG at Tehran CCPP during cold start run. The variations with time of gas, metal, water and steam temperatures at various sections of HRSG were among the studied parameters. Third, the model outputs were checked against the data reported for the HRSG performance test at Neyshaboor CCPP, at base and part loads. In all above cases the theoretical and measured or reported values were compared and satisfactory closeness was found.

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

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