scholarly journals Effect of Temperature, pH, and Reaction Duration on Microbially Induced Calcite Precipitation

2018 ◽  
Vol 8 (8) ◽  
pp. 1277 ◽  
Author(s):  
Gunjo Kim ◽  
Janghwan Kim ◽  
Heejung Youn
Keyword(s):  
Effect Of Temperature ◽  
Optimal Conditions ◽  
Calcite Precipitation ◽  
Sporosarcina Pasteurii ◽  
Reaction Duration ◽  
Microbially Induced Calcite Precipitation ◽  
Microbial Species ◽  
Ph Values ◽  
Staphylococcus Saprophyticus

In this study, the amount of calcite precipitate resulting from microbially induced calcite precipitation (MICP) was estimated in order to determine the optimal conditions for precipitation. Two microbial species (Staphylococcus saprophyticus and Sporosarcina pasteurii) were tested by varying certain parameters such as (1) initial potential of hydrogen (pH) of urea-CaCl2 medium, (2) temperature during precipitation, and (3) the reaction duration. The pH values used for testing were 6, 7, 8, 9, and 10, the temperatures were 20, 30, 40, and 50 °C, and the reaction durations were 2, 3, and 4 days. Maximum calcite precipitation was observed at a pH of 7 and temperature of 30 °C. Most of the precipitation occurred within a reaction duration of 3 days. Under similar conditions, the amount of calcite precipitated by S. saprophyticus was estimated to be five times more than that by S. pasteurii. Both the species were sensitive to temperature; however, S. saprophyticus was less sensitive to pH and required a shorter reaction duration than S. pasteurii.

Microbially Induced Calcite Precipitation-based Sequestration of Strontium by Sporosarcina pasteurii WJ-2

2014 ◽  
Vol 174 (7) ◽  
pp. 2482-2491 ◽  
Author(s):  
Chang-Ho Kang ◽  
Jae-Ho Choi ◽  
JunGu Noh ◽  
Dae Young Kwak ◽  
Sang-Hyun Han ◽  
...  
Keyword(s):  
Calcite Precipitation ◽  
Sporosarcina Pasteurii ◽  
Microbially Induced Calcite Precipitation

scholarly journals A revised model for microbially induced calcite precipitation: Improvements and new insights based on recent experiments

2015 ◽  
Vol 51 (5) ◽  
pp. 3695-3715 ◽  
Author(s):  
Johannes Hommel ◽  
Ellen Lauchnor ◽  
Adrienne Phillips ◽  
Robin Gerlach ◽  
Alfred B. Cunningham ◽  
...  
Keyword(s):  
Calcite Precipitation ◽  
Microbially Induced Calcite Precipitation

scholarly journals Effect of water temperature and pH on the concentration and time of ozone saturation

2018 ◽  
Vol 21 (0) ◽  
Author(s):  
Melicia Cintia Galdeano ◽  
Allan Eduardo Wilhelm ◽  
Isabella Borges Goulart ◽  
Renata Valeriano Tonon ◽  
Otniel Freitas-Silva ◽  
...  
Keyword(s):  
Water Temperature ◽  
Molecular Oxygen ◽  
Half Life ◽  
Low Ph ◽  
Ozone Content ◽  
Effect Of Temperature ◽  
Saturation Time ◽  
Gas Concentration ◽  
Ph Values ◽  
Effect Of Water

Abstract Ozone has been used for many years to disinfect water due to its oxidizing potential. Since it decomposes quickly into molecular oxygen, leaving no residue, it has important advantages for use. The decomposition of ozone is affected by the temperature and pH of the medium, low pH values and temperatures increasing its half-life, which can result in more efficient disinfection. With the objective of increasing the effectiveness of ozonation, this study investigated the effect of temperature (8 ºC and 25 °C) and pH (3.0 and 6.0) of the water on the saturation time and gas concentration, employing two initial gas concentrations (13.3 and 22.3 mg L-1). The concentration of ozone saturation increased as the temperature and pH of the medium decreased, as also with the higher initial gas concentration ( C0). The highest saturation concentrations were obtained at pH 3.0 and 8 °C (4.50 and 8.03 mg L-1 with C0 of 13.3 and 22.3 mg L-1, respectively). This higher ozone content could result in greater decontamination efficiency of the food products washed with this water.

Soil Bioconsolidation Through Microbially Induced Calcite Precipitation by Lysinibacillus sphaericus WJ-8

2016 ◽  
Vol 33 (6) ◽  
pp. 473-478 ◽  
Author(s):  
Chang-Ho Kang ◽  
Yoon-Jung Kwon ◽  
Jae-Seong So
Keyword(s):  
Calcite Precipitation ◽  
Lysinibacillus Sphaericus ◽  
Microbially Induced Calcite Precipitation

Effect of temperature on central chemical control of ventilation in the alligator Alligator mississippiensis

1993 ◽  
Vol 179 (1) ◽  
pp. 261-272
Author(s):  
L. G. Branco ◽  
S. C. Wood
Keyword(s):  
Fourth Ventricle ◽  
Ventilatory Response ◽  
Pulmonary Ventilation ◽  
Gas Mixtures ◽  
Alligator Mississippiensis ◽  
Effect Of Temperature ◽  
Peripheral Chemoreceptor ◽  
Peripheral Chemoreceptors ◽  
Ph Values ◽  
Arterial Ph

Central chemoreceptor function was assessed in unanesthetized alligators, Alligator mississippiensis, at body temperatures of 15, 25 and 35 degrees C. Two experiments were performed. In the first experiment, the fourth ventricle was perfused with mock cerebrospinal fluid (CSF) solutions of different pH values (7.1-7.9). Changes in pulmonary ventilation were evaluated with a pneumotachograph and arterial pH (pHa) was measured. Perfusion with low-pH solutions increased ventilation and arterial pH. Perfusion with high-pH solutions decreased ventilation and arterial pH. Mock CSF pH had a greater effect at higher temperatures. In the second experiment, the relative contributions of central and peripheral chemoreceptor drive to breathing were evaluated using hypercapnic gas mixtures to stimulate both central and peripheral chemoreceptors. Hypercapnia caused an increase in ventilation which was larger at higher temperatures. To stimulate only the peripheral chemoreceptors, the same hypercapnic gas mixtures were applied while the CSF pH of the fourth ventricle was kept constant by perfusion with a mock CSF solution. This reduced significantly the ventilatory response induced by hypercapnia. These data indicate that, regardless of the temperature, central chemoreceptors play a major role in the ventilatory regulation of the alligator. The change in pHa with temperature is compatible with the alphastat hypothesis.

Mechanical Behavior of Microbially Induced Calcite Precipitation Cemented Sand

2021 ◽  
Author(s):  
Igor Marasini de Rezende ◽  
Pedro Domingos Marques Prietto ◽  
Antônio Thomé ◽  
Francisco Dalla Rosa
Keyword(s):  
Mechanical Behavior ◽  
Calcite Precipitation ◽  
Cemented Sand ◽  
Microbially Induced Calcite Precipitation

Biocementation of Concrete Pavements Using Microbially Induced Calcite Precipitation

2017 ◽  
Vol 27 (7) ◽  
pp. 1331-1335 ◽  
Author(s):  
Jin-Hoon Jeong ◽  
Yoon-Soo Jo ◽  
Chang-Seon Park ◽  
Chang-Ho Kang ◽  
Jae-Seong So
Keyword(s):  
Concrete Pavements ◽  
Calcite Precipitation ◽  
Microbially Induced Calcite Precipitation

Sandy Soil Improvement through Microbially Induced Calcite Precipitation (MICP) by Immersion

10.3791/60059 ◽  
2019 ◽  
Author(s):  
Shihui Liu ◽  
Kang Du ◽  
Kejun Wen ◽  
Wei Huang ◽  
Farshad Amini ◽  
...  
Keyword(s):  
Sandy Soil ◽  
Soil Improvement ◽  
Calcite Precipitation ◽  
Microbially Induced Calcite Precipitation
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