scholarly journals Investigation of the optimal operating strategy for mixed culture polyhydroxyalkanoate (PHA) production under different nutrient conditions

2017 ◽  
Author(s):  
Qinxue Wen ◽  
Lizhi Zhao ◽  
Long Huang ◽  
Zhiqiang Chen
Keyword(s):  
Mixed Culture ◽  
Optimal Operating ◽  
Operating Strategy ◽  
Pha Production ◽  
Nutrient Conditions

The impact of pH control on the volumetric productivity of mixed culture PHA production from fermented molasses

2013 ◽  
Vol 14 (2) ◽  
pp. 143-152 ◽  
Author(s):  
Adrian Oehmen ◽  
Fátima V. Pinto ◽  
Vera Silva ◽  
Maria G. E. Albuquerque ◽  
Maria A. M. Reis
Keyword(s):  
Mixed Culture ◽  
Ph Control ◽  
Volumetric Productivity ◽  
Pha Production ◽  
The Impact

Microaerophilic conditions support elevated mixed culture polyhydroxyalkanoate (PHA) yields, but result in decreased PHA production rates

2012 ◽  
Vol 65 (2) ◽  
pp. 243-246 ◽  
Author(s):  
S. Pratt ◽  
A. Werker ◽  
F. Morgan-Sagastume ◽  
P. Lant
Keyword(s):  
Mixed Culture ◽  
Oxygen Limitation ◽  
Mixed Cultures ◽  
Biomass Growth ◽  
Production Rates ◽  
Early Stages ◽  
Batch Systems ◽  
Accumulation Capacity ◽  
Pha Production ◽  
Microaerophilic Conditions

For commercial polyhydroxyalkanoate (PHA) production the objective is to maximise the fraction of feedstock that ends up as polymer, and minimise biomass growth. In this paper, oxygen limitation was applied to achieve this. Intracellular PHA content in mixed cultures in batch systems operated with low and high DO was compared. It is shown that in microaerophilic conditions a higher fraction of substrate is accumulated as PHA in comparison to high DO conditions, evidenced by elevated intracellular PHA content: in the order of 50% higher in the early stages of accumulation. However, the accumulation capacity is not affected by DO. The PHA content in biomass in both the low and high DO systems reached approximately 35%. The time taken for the PHA content in the low DO system to reach capacity was three times longer than in the high DO system.

PHA production by mixed culture from a by-product of paper industry

2010 ◽  
Vol 150 ◽  
pp. 264-264 ◽  
Author(s):  
L.S. Serafim ◽  
S. Hus ◽  
H. Passos ◽  
P.C. Lemos ◽  
D. Evtuguin ◽  
...  
Keyword(s):  
Mixed Culture ◽  
Paper Industry ◽  
Pha Production

scholarly journals Comparative Calculation of the Fuel–Optimal Operating Strategy for Diesel Hybrid Railway Vehicles

2017 ◽  
Vol 27 (2) ◽  
pp. 323-336
Author(s):  
Maik Leska ◽  
Harald Aschemann ◽  
Michael Melzer ◽  
Michael Meinert
Keyword(s):  
Energy Storage ◽  
Lithium Ion ◽  
Simulation Models ◽  
High Energy ◽  
Hybrid Vehicles ◽  
Optimal Operating ◽  
Railway Vehicles ◽  
Operating Strategy ◽  
Operating Strategies ◽  
The One

Abstract In contrast to road-based traffic, the track as well as the corresponding duty cycle for railways are known beforehand, which represents a great advantage during the development of operating strategies for hybrid vehicles. Hence the benefits of hybrid vehicles regarding the fuel consumption can be exploited by means of an off-line optimisation. In this article, the fuel-optimal operating strategy is calculated for one specified track using two hybrid railway vehicles with different kinds of energy storage systems: on the one hand, a lithium-ion battery (high-energy storage) and, on the other, a double layer capacitor (high-power storage). For this purpose, control-oriented simulation models are developed for each architecture addressing the main effects contributing to the longitudinal dynamics of the power train. Based on these simulation models, the fuel-optimal operating strategy is calculated by two different approaches: Bellman’s dynamic programming, a wellknown approach in this field, and an innovative sensitivity-based optimisation.

Evaluation and Optimization of Automated Operation in Small CHP Plants

2000 ◽  
Author(s):  
Jeppe Grue ◽  
Jens Andersen ◽  
Niels From ◽  
Inger Bach
Keyword(s):  
Power Generation ◽  
Objective Function ◽  
Electric Power ◽  
Power Plants ◽  
Electrical Power ◽  
District Heating ◽  
Combined Heat And Power ◽  
Optimal Operating ◽  
Gas Engine ◽  
Operating Strategy

Abstract In Denmark power generation is extensively based on small combined heat and power plants, which produce electric power and district heating. This work will focus on the small plants around 1 MW in size, which are often unmanned and operating completely automatically. The objective of this work is to formulate a method which can be used to determine the optimal operating strategy for a CHP plant, and that this strategy must be fully automated. The contribution margin of the plant is used as the objective function for the optimization. Finally the method is tested on a small CHP plant, which is a gas engine producing 1.34 MW electrical power and 1.6 MJ/s district heating. The methods, which are developed, can be used in general for the evaluation and optimization of automated strategies for the operation of small-unmanned CHP plants. The strong feature of the method is that it sets an ultimate target that is the best possible one to obtain with a view to any strategy. This provides a basis for the evaluation and optimization of the actual strategy.

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