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Microbial induced calcium carbonate precipitation has been proposed as an alternative cementation technique to improve the properties of potentially liquefiable sand. [ 1 ] [ 18 ] [ 20 ] [ 21 ] [ 22 ] The increase in shear strength, confined compressive strength, stiffness and liquefaction resistance was reported due to calcium carbonate ...
Microbial electrolysis carbon capture (MECC) is a carbon capture technique using microbial electrolysis cells during wastewater treatment. MECC results in net negative carbon emission wastewater treatment by removal of carbon dioxide ( CO 2 ) during the treatment process in the form of calcite (CaCO 3 ) , and production of profitable H 2 gas.
When the concrete cracks, water ingress dissolves the nutrients and the bacteria germinate triggering calcium carbonate precipitation, resealing the crack and protecting the steel reinforcement from corrosion. [116] This process can also be used to manufacture new hard materials, such as bio-cement. [117] [114]
Figure 1: SEM image of a virgin (new) RO membrane that has not been scaled Figure 2: SEM image of a RO membrane that has been scaled. Membrane scaling is when one or more sparingly soluble salts (e.g., calcium carbonate, calcium phosphate, etc.) precipitate and form a dense layer on the membrane surface in reverse osmosis (RO) applications. [1]
Precipitative softening: [4]: 13.12–13.58 Water rich in hardness (calcium and magnesium ions) is treated with lime (calcium oxide) and/or soda-ash (sodium carbonate) to precipitate calcium carbonate out of solution utilising the common-ion effect. Electrodeionization: [9] Water is passed between a positive electrode and a negative electrode.
Geomicrobiology studies microorganisms that are driving the Earth's biogeochemical cycles, mediating mineral precipitation and dissolution, and sorbing and concentrating metals. [4] The applications include for example bioremediation , [ 5 ] mining , climate change mitigation [ 6 ] and public drinking water supplies.
An aerial view of a whiting event precipitation cloud in Lake Ontario. A whiting event is a phenomenon that occurs when a suspended cloud of fine-grained calcium carbonate precipitates in water bodies, typically during summer months, as a result of photosynthetic microbiological activity or sediment disturbance.
The constituent carbonate mud is a type of automicrite (or authigenic carbonate mud); therefore, it precipitates in situ instead of being transported and deposited. Being formed in situ, a microbialite can be seen as a type of boundstone where reef builders are microbes, and precipitation of carbonate is biotically induced instead of forming ...