scholarly journals Modeling interspecific competition of the microbial community during anaerobic digestion based on cellular automata and ADM1

2021 ◽  
Author(s):  
Miao Zhang ◽  
En Shi ◽  
Yafeng Li
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Cellular Automata ◽  
Interspecific Competition ◽  
Microbial Growth ◽  
Layer Structure ◽  
Biomass Distribution ◽  
Water Association ◽  
Ca Model ◽  
International Water

Abstract Interspecific competition for substrate and space gives rise to considerable variation in biomass distribution within the microbial community. To study microbial community in depth, we employed such research methods as sampling and analytical measurements, and developed a cellular automata (CA) model that would facilitates description of the microbial growth process based on the Anaerobic Digestion Model No. 1 (ADM1) of the International Water Association (IWA). Using the CA model, we aimed to determine whether interspecific competition occurs among acidogens, acetogens and methanogens, and examine the influence of interspecific competition on the spatial structure of microbial communities. We found that acetogens and methanogens competed for core space, resulting in a multi-layer structure. Butyrate-degrading acetogens increased in number, resulting in inhibition of propionate-degrading acetogens. Hydrogenotrophic methanogens showed stronger competitive advantage than acetotrophic methanogens. The simulation showed that the multi-layer structure of the microbial community was formed by interspecific competition.

scholarly journals Implementation of the anaerobic digestion model (ADM1) in the PHREEQC chemistry engine

2017 ◽  
Vol 76 (5) ◽  
pp. 1090-1103 ◽  
Author(s):  
Patrick Huber ◽  
Christophe Neyret ◽  
Eric Fourest
Keyword(s):  
Anaerobic Digestion ◽  
Ionic Composition ◽  
Simulation Software ◽  
Physico Chemical ◽  
Programming Effort ◽  
Water Association ◽  
Full Power ◽  
International Water ◽  
Multiple Mineral ◽  
Precipitation Phenomena

Anaerobic digestion is state-of-the-art technology to treat sludge and effluents from various industries. Modelling and optimisation of digestion operations can be advantageously performed using the anaerobic digestion model (ADM1) from the International Water Association. The ADM1, however, lacks a proper physico-chemical framework, which makes it difficult to consider wastewater of complex ionic composition and supersaturation phenomena. In this work, we present a direct implementation of the ADM1 within the PHREEQC chemistry engine. This makes it possible to handle ionic strength effects and ion-pairing. Thus, multiple mineral precipitation phenomena can be handled while resolving the ADM1. All these features can be accessed with very little programming effort, while retaining the full power and flexibility of PHREEQC. The distributed PHREEQC code can be easily interfaced with process simulation software for future plant-wide simulation of both wastewater and sludge treatment.

PENGARUH UPAH MINUMUM TERHADAP TENAGA KERJA DI NEGARA DENGAN TINGKAT PENGHASILAN RATA-RATA YANG RENDAH

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Veny Anindya Puspitasari
Keyword(s):  
Minimum Wage ◽  
Basic Needs ◽  
Wage Policy ◽  
Average Income ◽  
Income Per Capita ◽  
Unskilled Workers ◽  
Water Association ◽  
International Water ◽  
Per Capita ◽  
Association Data

<p>The minimum wage is a macroeconomic issue that is still debated, Basically, the minimum wage policy aimed to protect workers, so that thet earn an adequate wages to finance the basic needs of their life. Practically, the minimum wage policy often encounters its purpose because it is regarged as miserable for those who have no expertise. This phenomenon is mainly happening in the low –avegrage- income countries that have many unskilled workers. Gahana, Indonesia, Costra Rica were used to be analyzed in this paper. According to International Water Association data year 2006, those countris earn income per capita less than US$ 9,200 and were categorized as low average – income countries. This research found that minimum wage impelentation in all three countries was not effective. When minimum wage policy was implemented, a lot of people felt aggrieved.</p><p>Keywords : Economic polict, Minimum wage, Income</p>

A GIS-Based Irregular Cellular Automata Model of Land-Use Change

2007 ◽  
Vol 34 (4) ◽  
pp. 708-724 ◽  
Author(s):  
Daniel Stevens ◽  
Suzana Dragićević
Keyword(s):  
Land Use ◽  
Cellular Automata ◽  
Land Use Change ◽  
Spatial Data ◽  
Cellular Automata Model ◽  
Population Growth Rates ◽  
Asynchronous Development ◽  
Canadian City ◽  
Ca Model ◽  
Developing Area

This study proposes an alternative cellular automata (CA) model, which relaxes the traditional CA regular square grid and synchronous growth, and is designed for representations of land-use change in rural-urban fringe settings. The model uses high-resolution spatial data in the form of irregularly sized and shaped land parcels, and incorporates synchronous and asynchronous development in order to model more realistically land-use change at the land parcel scale. The model allows urban planners and other stakeholders to evaluate how different subdivision designs will influence development under varying population growth rates and buyer preferences. A model prototype has been developed in a common desktop GIS and applied to a rapidly developing area of a midsized Canadian city.

scholarly journals A Cellular Automata Model for Integrated Simulation of Land Use and Transport Interactions

2021 ◽  
Vol 10 (3) ◽  
pp. 149
Author(s):  
Nuno Pinto ◽  
António P. Antunes ◽  
Josep Roca
Keyword(s):  
Land Use ◽  
Cellular Automata ◽  
Land Use Change ◽  
Urban Studies ◽  
Particle Swarm Algorithm ◽  
Cellular Automata Model ◽  
Integrated Simulation ◽  
The Road ◽  
Ca Model ◽  
The City

Cellular automata (CA) models have been used in urban studies for dealing with land use change. Transport and accessibility are arguably the main drivers of urban change and have a direct influence on land use. Land use and transport interaction models deal with the complexity of this relationship using many different approaches. CA models incorporate these drivers, but usually consider transport (and accessibility) variables as exogenous. Our paper presents a CA model where transport variables are endogenous to the model and are calibrated along with the land use variables to capture the interdependent complexity of these phenomena. The model uses irregular cells and a variable neighborhood to simulate land use change, taking into account the effect of the road network. Calibration is performed through a particle swarm algorithm. We present an application of the model to a comparison of scenarios for the construction of a ring road in the city of Coimbra, Portugal. The results show the ability of the CA model to capture the influence of change of the transport network (and thus in accessibility) in the land use dynamics.

Effects of Mediterranean agricultural residues on microbial community and anaerobic digestion performance

2021 ◽  
Author(s):  
Francesca Valenti ◽  
Juan Pablo Rojas‐Sossa ◽  
Yuan Zhong ◽  
Simona M. C. Porto ◽  
Attilio Toscano ◽  
...  
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Agricultural Residues
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