Related Experiment Video
Updated: Apr 20, 2026
09:04
Microbiologically Induced Calcite Precipitation Mediated by Sporosarcina pasteurii
Published on: April 16, 2016
23.3K
Calcium precipitate induced aerobic granulation
Chunli Wan1, Duu-Jong Lee2, Xue Yang1
1Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Bioresource Technology
|December 3, 2014
Summary
Aerobic granulation uses calcium precipitates as cores for bacterial growth in wastewater treatment. This process enhances exopolysaccharide production, leading to mature granules for effective treatment.
Area of Science:
- Environmental biotechnology
- Microbiology
- Wastewater treatment
Background:
- Aerobic granulation is an emerging biotechnology for efficient wastewater treatment.
- Understanding the mechanisms of aerobic granulation is crucial for optimizing its application.
Purpose of the Study:
- To refine the understanding of aerobic granulation mechanisms.
- To elucidate the role of inorganic cores and microbial communities in granule formation.
Main Methods:
- Investigated the sequencing process of aerobic granulation.
- Analyzed the composition of mature granules, including inorganic cores and microbial strains.
- Examined the role of specific bacterial strains and gene expression in exopolysaccharide production.
Main Results:
- Aerobic granulation involves the formation of calcium phosphate inorganic cores.
- Mature granules consist of an inner core, a matrix layer, and a rim layer with specific microbial enrichments.
- Functional bacterial strains (e.g., Sphingomonas sp., Paracoccus sp.) attach to cores and promote exopolysaccharide production via c-di-GMP signaling.
Conclusions:
- The study provides a refined mechanism for aerobic granulation, highlighting the sequential process from inorganic core formation to mature granule development.
- Specific microbial strains and their genetic pathways are key drivers of exopolysaccharide matrix formation, essential for stable granule structure.
- This enhanced understanding can optimize aerobic granulation for improved wastewater treatment efficacy.
Related Concept Videos
00:52Washing, Drying, and Ignition of Precipitates
7.2K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
7.2K
00:49Gravimetry: Inorganic And Organic Precipitating Agents
7.4K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
7.4K
01:12Precipitation Processes
6.6K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
6.6K
01:09Colloidal precipitates
6.9K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.9K
04:01Factors Affecting Solubility
39.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
39.5K
01:03Precipitation Gravimetry
16.5K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
16.5K