Simple model for CO2 absorption in a bubbling water column

Martinez, I.; Casas, Pedro A.

doi:10.1590/s0104-66322012000100012

Cited by 15 publications

(6 citation statements)

References 6 publications

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“…32 µm, was expected to produce bubbles with diameters of 0.40-0.45 mm 33 that would rise at rates of 0.09-0.11 m s -1 . 34 We assumed that direct injection of these small bubbles through the air stone disk did not alter mixing effects or disturb the plankton in the mesocosm. We inoculated the mesocosms with phytoplankton species that had [键入文字] been studied extensively in the laboratory: two diatoms, Phaeodactylum tricornuntum (CCMA 106) and Thalassiosira weissflogii (CCMP 102), and the coccolithophorid Emiliania huxleyi (CS-369).…”

Section: Methodsmentioning

confidence: 99%

Effects of increasing atmospheric CO2 on the marine phytoplankton and bacterial metabolism during a bloom: A coastal mesocosm study

Huang

Liu

Laws

et al. 2018

Science of The Total Environment

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Increases of atmospheric CO concentrations due to human activity and associated effects on aquatic ecosystems are recognized as an environmental issue at a global scale. Growing attention is being paid to CO enrichment effects under multiple stresses or fluctuating environmental conditions in order to extrapolate from laboratory-scale experiments to natural systems. We carried out a mesocosm experiment in coastal water with an assemblage of three model phytoplankton species and their associated bacteria under the influence of elevated CO concentrations. Net community production and the metabolic characteristics of the phytoplankton and bacteria were monitored to elucidate how these organisms responded to CO enrichment during the course of the algal bloom. We found that CO enrichment (1000μatm) significantly enhanced gross primary production and the ratio of photosynthesis to chlorophyll a by approximately 38% and 39%, respectively, during the early stationary phase of the algal bloom. Although there were few effects on bulk bacterial production, a significant decrease of bulk bacterial respiration (up to 31%) at elevated CO resulted in an increase of bacterial growth efficiency. The implication is that an elevation of CO concentrations leads to a reduction of bacterial carbon demand and enhances carbon transfer efficiency through the microbial loop, with a greater proportion of fixed carbon being allocated to bacterial biomass and less being lost as CO. The contemporaneous responses of phytoplankton and bacterial metabolism to CO enrichment increased net community production by about 45%, an increase that would have profound implications for the carbon cycle in coastal marine ecosystems.

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Section: Methodsmentioning

confidence: 99%

Effects of increasing atmospheric CO2 on the marine phytoplankton and bacterial metabolism during a bloom: A coastal mesocosm study

Huang

Liu

Laws

et al. 2018

Science of The Total Environment

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“…In a bubbling system, the surface area depends on the number and size of bubbles, which are difficult to estimate (e.g. Martínez and Casas, 2012). Here, to simply our model, we define an exchange rate constant into the Eq.…”

Section: Exchanging Between Co2(g) and Co2(aq)mentioning

confidence: 99%

The DIC carbon isotope evolutions during CO2 bubbling: implications for ocean acidification laboratory culture

Zhang¹,

Torres-Romero²,

Anjewierden³

et al. 2022

Preprint

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Ocean acidification increases pCO2 and decreases pH of seawater and its impact on marine organisms has emerged as a key research focus. In addition to directly measured variables such as growth or calcification rate, stable isotopic tracers such as carbon isotopes have also been used to more completely understand the physiological processes contributing to the response of organisms to ocean acidification. To simulate ocean acidification in laboratory cultures, direct bubbling of seawater with CO2 has been a preferred method because it adjusts pCO2 and pH without altering total alkalinity. Unfortunately, the carbon isotope equilibrium between seawater and CO2 gas has been largely ignored so far. Frequently, the dissolved inorganic carbon (DIC) in the initial seawater culture has a distinct 13C/12C ratio which is far from the equilibrium expected with the isotopic composition of the bubbled CO2. To evaluate the consequences of this type of experiment for isotopic work, we measured the carbon isotope evolutions in two chemostats during CO2 bubbling and composed a numerical model to simulate this process. The isotopic model can predict well the carbon isotope ratio of dissolved inorganic carbon evolutions during bubbling. With help of this model, the carbon isotope evolution during a batch and continuous culture can be traced dynamically improving the accuracy of fractionation results from laboratory culture. Our simulations show that if not properly accounted for in experimental or sampling design, many typical culture configurations involving CO2 bubbling can lead to large errors in estimated carbon isotope fractionation between seawater and biomass or biominerals, consequently affecting interpretations and hampering comparisons among different experiments. Therefore, we describe the best practices on future studies working with isotope fingerprinting in the ocean acidification background.

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“…where m, mass transfer, j m , mass flow, and S, interfacial area, and it is shown that the relationship between mass transfer is directly proportional to the contact area. Additionally, a more detailed mathematical model of absorption rate with other parameters had been derived by Martinez I. et al [21] using Fick's Law shown in Equation ( 9):…”

Section: System Performance With Deployment Of Carbon Dioxide (Co2) Diffusermentioning

confidence: 99%

Determination of Dissolved CO2 Concentration in Culture Media: Evaluation of pH Value and Mathematical Data

et al. 2020

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Carbon dioxide is the most influential gas in greenhouse gasses and its amount in the atmosphere reached 412 µmol/mol in August 2020, which increased rapidly, by 48%, from preindustrial levels. A brand-new chemical industry, namely organic chemistry and catalysis science, must be developed with carbon dioxide (CO2) as the source of carbon. Nowadays, many techniques are available for controlling and removing carbon dioxide in different chemical processes. Since the utilization of CO2 as feedstock for a chemical commodity is of relevance today, this study will focus on how to increase CO2 solubility in culture media used for growing microbes. In this work, the CO2 solubility in a different medium was investigated. Sodium hydroxide (NaOH) and monoethanolamine (MEA) were added to the culture media (3.0 g/L dipotassium phosphate (K2HPO4), 0.2 g/L magnesium chloride (MgCl2), 0.2 g/L calcium chloride (CaCl2), and 1.0 g/L sodium chloride (NaCl)) for growing microbes in order to observe the difference in CO2 solubility. Factors of temperature and pressure were also studied. The determination of CO2 concentration in the solution was measured by gas analyzer. The result obtained from optimization revealed a maximum CO2 concentration of 19.029 mol/L in the culture media with MEA, at a pressure of 136.728 kPa, operating at 20.483 °C.

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Simple model for CO2 absorption in a bubbling water column

Cited by 15 publications

References 6 publications

Effects of increasing atmospheric CO2 on the marine phytoplankton and bacterial metabolism during a bloom: A coastal mesocosm study

Effects of increasing atmospheric CO2 on the marine phytoplankton and bacterial metabolism during a bloom: A coastal mesocosm study

The DIC carbon isotope evolutions during CO2 bubbling: implications for ocean acidification laboratory culture

Determination of Dissolved CO2 Concentration in Culture Media: Evaluation of pH Value and Mathematical Data

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