RESEARCH PAPERS : CONTROL OF TWO-STAGE CYCLIC ANAEROBIC PROCESSES BASED ON OPTIMIZATION OF CYCLE TIME

2003 ◽  
Vol 8 (5) ◽  
pp. 259-272
Author(s):  
Young-Tai Cho ◽  
JamesC. Young
Keyword(s):  
Cycle Time ◽  
Research Papers ◽  
Two Stage ◽  
Anaerobic Processes

Effects of phosphorus limitation and temperature on PHA production in activated sludge

2004 ◽  
Vol 50 (8) ◽  
pp. 135-143 ◽  
Author(s):  
S. Chinwetkitvanich ◽  
C.W. Randall ◽  
T. Panswad
Keyword(s):  
Activated Sludge ◽  
Nutrient Limitation ◽  
Growth Phase ◽  
Cycle Time ◽  
Phosphorus Limitation ◽  
Two Stage ◽  
Mixed Liquor ◽  
Pha Production ◽  
Effects Of Temperature ◽  
And Storage

The study was designed to investigate the effects of temperature and phosphorus limitation on polyhydroxyalkanoate (PHA) production and storage by activated sludge biomass. The two-stage operation approach, i.e. a growth phase followed by a nutrient limitation phase, was applied to induce PHA accumulation. The pre-selected temperatures of 10, 20 and 30°C were investigated under phosphorus limitation conditions using three four-litre fully aerobic SBR systems operated at an SRT of 10 days with cycle time and HRT of 6 and 10 hours. PHA production was greater in the 10°C system than in the 20°C and 30°C systems but there was little difference between the two higher temperatures. The maximum PHA fractions of the sludge were 52, 45 and 47%TSS for the three temperatures from low to high, and the maximum PHA concentrations in the mixed liquors were 1,491, 1,294 and 1,260 mg/l, respectively. However, it was observed that very low values of PHA yield per unit COD consumed were obtained, i.e., 0.05, 0.03 and 0.04 mgPHA/mgCODu, for the 10, 20 and 30°C reactors, respectively. This was because all three systems required several days to reach maximum PHA accumulation in their mixed liquor biomasses. It is probable the bacteria still had some stored poly-P in their cells upon initiation of the phosphorus limited influent, and PHA accumulation was delayed until the stored phosphorus was depleted. Also, PHA productivity was reduced by the large amounts of biomass lost from the systems because of sludge bulking.

scholarly journals Innovative Design and Performance of Three-Bed Two-Stage Adsorption Cycle under Optimized Cycle Time

2012 ◽  
Vol 7 (1) ◽  
pp. 92-108 ◽  
Author(s):  
Abul Fazal Mohammad Mizanur RAHMAN ◽  
Yuki UEDA ◽  
Atsushi AKISAWA ◽  
Takahiko MIYAZAKI ◽  
Bidyut Baran SAHA
Keyword(s):  
Cycle Time ◽  
Two Stage ◽  
Innovative Design ◽  
And Performance ◽  
Adsorption Cycle

On the Cycle Time Distribution in a Two-Stage Cyclic Network with Blocking

1989 ◽  
Vol 15 (10) ◽  
pp. 1206-1216 ◽  
Author(s):  
S. Balsamo ◽  
L. Donatiello
Keyword(s):  
Cycle Time ◽  
Time Distribution ◽  
Two Stage ◽  
Cyclic Network

OPTIMIZATION OF CYCLE TIME FOR TWO-STAGE CYCLIC ANAEROBIC FILTERS

2002 ◽  
Vol 2002 (10) ◽  
pp. 512-536
Author(s):  
Young-Tai Cho ◽  
Duk Chang ◽  
James C. Young
Keyword(s):  
Cycle Time ◽  
Two Stage

scholarly journals On response time and cycle time distributions in a two-stage cyclic queue

1982 ◽  
Vol 2 (3) ◽  
pp. 181-194 ◽  
Author(s):  
O.J. Boxma ◽  
P. Donk
Keyword(s):  
Response Time ◽  
Cycle Time ◽  
Two Stage

Algebraic modelling of a two level supply chain with defective items

2018 ◽  
Vol 52 (2) ◽  
pp. 415-427 ◽  
Author(s):  
Mohamed E. Seliaman ◽  
Mehmood Khan ◽  
Leopoldo Eduardo Cárdenas-Barrón
Keyword(s):  
Sensitivity Analysis ◽  
Supply Chain ◽  
Cycle Time ◽  
Differential Calculus ◽  
Coordination Mechanisms ◽  
Algebraic Solution ◽  
Two Stage ◽  
Defective Items ◽  
Imperfect Items ◽  
Algebraic Modelling

M. Khan and M.Y. Jaber, Optimal inventory cycle in a two-stage supply chain incorporating imperfect items from suppliers. Int. J. Oper. Res. 10 (2011) 442–457, have addressed a two level supply chain of defective items. They compared three coordination mechanisms, i.e. cycle time; K–multiplier cycle time; and 2K–multiplier cycle time. This paper proposes a simpler algebraic solution for the K–multiplier cycle time mechanism without the use of differential calculus. The two level supply chain with defective items is illustrated with a numerical example. A sensitivity analysis is also provided.

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

364: Two stage "Progressive Elongation of Spermatic Cord" Technique in Criptorchidism with very short Spermatic Vessels

2007 ◽  
Vol 177 (4S) ◽  
pp. 121-121
Author(s):  
Antonio Dessanti ◽  
Diego Falchetti ◽  
Marco Iannuccelli ◽  
Susanna Milianti ◽  
Gian P. Strusi ◽  
...  
Keyword(s):  
Spermatic Cord ◽  
Two Stage
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