The Use of Microelectrodes to Study the Precipitation of Calcite upon Algal Biofilms

Hartley, A; House, William A.; Leadbeater, B. S. C.; Callow, Maureen E.

doi:10.1006/jcis.1996.0573

Cited by 74 publications

(44 citation statements)

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“…Among them, Ca and Mg were the main elements that reduced nearly half of its amounts from 17.2 mg L −1 and 11.3 mg L −1 to 10.6 mg L −1 and 6.27 mg L −1 respectively. This suggests that the co-precipitation was also an important mechanism for P removal in the presence of periphyton (Hartley et al, 1996). Furthermore, the dominant materials that have precipitated during the removal process mainly consists of CaCO 3 or Ca(OH) 2 and MgCO 3 or Mg(OH) 2 .…”

Section: P Removal By the Periphytonmentioning

confidence: 99%

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Feng

et al. 2016

Science of The Total Environment

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• Phototrophic periphyton is effective in removing P (P o and P i ) from wastewaters.• Adsorption with physiochemical characteristic dominated P removal mechanism by periphyton.• The P within periphyton is mainly in forms of Labile-P and Ca-P.• The periphyton has vast potential application in recovering P for salt-soil zone The P (P i as KH 2 PO 4 and P o as ATP) removal processes by phototrophic periphyton were investigated by determining the removal kinetics, metal content (Ca, Mg, Al, Fe, Cu, and Zn) of the solution and P fractions (Labile-P, Fe/Al-P, Ca-P, and Res-P) within the periphyton. Results showed that the periphyton was able to remove completely both P i and P o after 48 h when periphyton content was greater than 0.2 g L −1 (dry weight). The difference between P i and P o removal was the conversion of P o into P i by the periphyton, after that the removal mechanism was similar. The P removal mechanism was mainly due to the adsorption on the surfaces of the periphyton, including two aspects: i) the adsorption of PO 4 3− onto metal salts such as calcium carbonate (~50%) and ii) complexation between PO 4 3− and metal cations such as Ca 2+ (~40%). However, this bio-adsorptional process was significantly influenced by the extracellular polymeric substance (EPS) of periphyton, water hardness, initial G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f oKeywords:Science of the Total Environment 568 (2016) 838-844Abbreviations: α, the initial adsorption rate (mg g −1 h −1 ); β, the desorption constant (g mg −1 ); m, mass of adsorbent (g); t, time (h); C, the constant of boundary layer effect; H, Shannon index; R, ideal gas constant (8.314 J mol −1 K −1 ); T, temperature (K); V, the volume of solutions (L); k 1 , pseudo-first-order kinetic model rate constant (h −1 ); k 2 , pseudosecond-order kinetic model rate constant (mg g −1 h −1 ); q e , the amount of P adsorbed onto the periphyton at equilibrium (mg g −1 ); q e,cal , the amount of P adsorbed onto the periphyton calculated by model at equilibrium (mg g −1 ); q m , the maximum adsorption capacity for the periphyton (mg g −1 ); q t , the amount of P adsorbed onto the periphyton at time t (mg g −1 ); C 0 , initial P concentration (mg L −1 ); K id , intraparticle rate constant (mg g −1 h -0.5 ); P i , inorganic phosphorus (mg L −1 ); P o , organic phosphorus (mg L −1 ); TP, the total phosphorus content (mg L −1 ); R 2 , linear regression coefficient; ANSW, artificial non-point source wastewater; ATP, disodium adenosine triphosphate (C 10 H 14 O 13 N 5 P 3 Na 2 ·3H 2 O); DW, dry weight of the periphyton (g); EPS, extracellular polymeric substance of the periphyton; PDW, pure distilled water.⁎ Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v P concentration, temperature and light intensity. This study not only deepens the understanding of P biogeochemical process in aquatic ecosystem, but provides a potential biomaterial...

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Section: P Removal By the Periphytonmentioning

confidence: 99%

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Feng

et al. 2016

Science of The Total Environment

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“…The microorganisms involved in carbonate biomineralization cover nearly all classes, including bacteria, algae, and fungi (22)(23)(24)(25)(26)(27). It has been reported that more than 200 soil bacteria, including Pseudomonas spp., Bacillus subtilis, and Azotobacter spp., are capable of inducing calcium carbonate precipitation (5).…”

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confidence: 99%

Spatial Patterns of Carbonate Biomineralization in Biofilms

Chopp

Russin

et al. 2015

Appl Environ Microbiol

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dMicrobially catalyzed precipitation of carbonate minerals is an important process in diverse biological, geological, and engineered systems. However, the processes that regulate carbonate biomineralization and their impacts on biofilms are largely unexplored, mainly because of the inability of current methods to directly observe biomineralization within biofilms. Here, we present a method for in situ, real-time imaging of biomineralization in biofilms and use it to show that Pseudomonas aeruginosa biofilms produce morphologically distinct carbonate deposits that substantially modify biofilm structures. The patterns of carbonate biomineralization produced in situ were substantially different from those caused by accumulation of particles produced by abiotic precipitation. Contrary to the common expectation that mineral precipitation should occur at the biofilm surface, we found that biomineralization started at the base of the biofilm. The carbonate deposits grew over time, detaching biofilm-resident cells and deforming the biofilm morphology. These findings indicate that biomineralization is a general regulator of biofilm architecture and properties. Microbially induced carbonate precipitation represents an essential pathway for sequestration of large amounts of carbon in ancient and modern environments (1-5). Rock records reveal that Precambrian stromatolites formed as a consequence of trapping, binding, and precipitation of calcium carbonate by the growth and metabolism of microorganisms (2-4). Modern carbonate microbialites are found in a wide range of environments, including freshwater, oceans, hypersaline lakes, and soils (6, 7). Clinically, prolonged bacterial infection of indwelling urinary catheters leads to the formation of mineralized biofilms that can occlude the catheter lumen and cause serious complications (8-10). Some persistent infections of the lungs, particularly those associated with the genetic disorder primary ciliary dyskinesia, involve precipitation of calcium-rich stones or coatings (11)(12)(13)(14). In engineered systems, microbially induced scale formation decreases the performance of a wide variety of processes, including membrane separations in water treatment and heat exchange efficiency in cooling towers (15, 16). More recently, calcium carbonate biomineralization has also been explored as a novel biotechnology for the purpose of bioremediation and stabilization of porous structures, including soils, sediments, and construction materials (17-21).The microorganisms involved in carbonate biomineralization cover nearly all classes, including bacteria, algae, and fungi (22-27). It has been reported that more than 200 soil bacteria, including Pseudomonas spp., Bacillus subtilis, and Azotobacter spp., are capable of inducing calcium carbonate precipitation (5). Diverse microbial metabolisms, such as photosynthesis, sulfate reduction, and urea hydrolysis, can induce carbonate precipitation by significantly changing the saturation state of calcium carbonate (28,29). Microbial respiration p...

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“…The specific EPS characteristics might regulate physiological processes and interactions within the microbial community. EPS functions as a chelator for cations and the template for crystal nucleation [31][32][33][34] (Figure 2). Some EPS macromolecules contain hydroxyl and/or carboxyl groups that strongly bind Ca 2C and other cations, such as Mg 2C , inhibiting CaCO 3 precipitation [33].…”

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confidence: 99%