kinetics of pcc production

Effects of inorganic carbon and pH on growth kinetics of ...

Growth pH and the concentration of bioavailable inorganic carbon (C ib) are two essential factors controlling the rate of photoautotrophic growth of microalgae.We developed a novel experimental strategy to determine the effects of pH and C ib independently by a pH-Stat and the use of NH 4 NO 3 as the N source. We grew Synechocystis sp. PCC 6803 at pH values of 7.5, 8.5, and 9.5, with a stable ...

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Leaching thermodynamics and kinetics of oil shale waste ...

However, this property makes OSA (or OSA leachates) an attractive material for C[O.sub.2] mineralization [13, 14] or producing precipitated calcium carbonate (PCC) [15, 16]. Currently, the lack of kinetic process data, including that characterizing leaching, impedes the implementation of more effective waste valorization and environmental ...

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Hepatotoxin Production Kinetics of the Cyanobacterium ...

Freshwater cyanobacteria (blue-green algae) can produce numerous potent toxins and represent an increasing environmental hazard. The microcystin content (cyclic heptapeptidic toxins) of the hepatotoxic cyanobacterium Microcystis aeruginosa PCC 7820 was investigated. Ten microcystins were identified using high performance liquid microchromatography (micro HPLC) coupled to either a ultraviolet ...

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Flocculation kinetics of precipitated calcium carbonate ...

This paper studies the kinetics of PCC aggregation before adding PCC to the wet end of a paper machine. Various polymers were evaluated for their ability to aggregate PCC and to find the chemistry and conditions that induce an optimum PCC floc size during papermaking.PCC aggregation was studied using particle size measurement, photometric dispersion analysis (PDA), scanning electron …

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Flocculation of PCC filler in papermaking: Influence of ...

1. Introduction. In the last decade precipitated calcium carbonate (PCC) is gaining preference in relation to ground calcium carbonate (GCC) as filler in the papermaking industry (Chapnerkar, 2004).The PCC production process requires, however, the use of several additives in order to control particle size, shape and surface characteristics and, therefore, the flocculation process and the flocs ...

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DE-FE0031705: Synthetic Calcium Carbonate Production by ...

Develop and evaluate the proposed methods for production of precipitated calcium carbonate (PCC) while simultaneously utilizing CO 2 and industrial solid and liquid wastes. DE-FE0031705: Synthetic Calcium Carbonate Production by Carbon Dioxide (CO 2) Mineralization of Industrial Waste Brines

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Precipitated calcium carbonate (PCC) is an extremely ...

Control of the properties in a technological process of PCC production is still mostly based on the experience rather than the numerous scientific studies of kinetics and mechanisms of the calcium carbonate precipitation. The knowledge and experience that have been colected in the Laboratory for Precipitation Processes during the years of ...

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Production of precipitated calcium carbonate from calcium ...

The commercially available carbonation process for PCC production is an example of this practice: the solid content of the slurry in the carbonation reactor is as high as 20% . Although the PCC production process dissolves CaO, and not Ca(OH) 2, the solubility of Ca(OH) 2 …

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Effects of Light on the Microcystin Content of Microcystis ...

Jul 12, 2002· Many cyanobacteria produce microcystins, hepatotoxic cyclic heptapeptides that can affect animals and humans. The effects of photosynthetically active radiation (PAR) on microcystin production by Microcystis strain PCC 7806 were studied in continuous cultures.Microcystis strain PCC 7806 was grown under PAR intensities between 10 and 403 μmol of photons m −2 s −1 on a light-dark rhythm of ...

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Curing Kinetic Study of Epoxy Toughened by Precipitated ...

Therefore, the objective of this study is to investigate the curing reactivity and kinetics of diglycidyl ether of bisphenol A epoxy (DGEBA) toughened by precipitated calcium carbonate (PCC).

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Physical properties and thermal behavior of reconstituted ...

Mar 27, 2017· Addition of precipitated calcium carbonate (PCC) to cellulosic products can reduce production costs and modify their physical properties. This study investigated the effects of adding PCC on the properties of reconstituted tobacco sheet (RTS), a cellulosic product. Scanning electron microscopy (SEM) analysis showed that adding PCC to the coating could modify the surface …

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PRECIPITATED CALCIUM CARBONATE PRODUCTION, …

production of precipitated calcium carbonate (PCC). The experimental flow sheet and evaluated parameters for the production are given in Fig. 2 and Tables 2–4, respectively. Calcination of calcite results in its decomposition as CO 2 gas and water-soluble CaO that was used in PCC production. The waste marble samples were calcined at

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Targeting antigen to CD19 on B cells efficiently activates ...

In vivo targeting of antigen to B cells with PCC–anti-CD19 or PCC–anti-IgM. B10.BR mice were intravenously (i.v.) administrated 10 μg of PCC–anti-mouse CD19 or PCC–anti-mouse IgM complexes or biotin–PCC as control. The peripheral blood was harvested with heparin at the indicated time points in …

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Utilization of oil shale combustion wastes for PCC ...

Oil shale ash could be utilized as a low-cost source of lime for PCC production. • The dissolution mechanisms and kinetics of Ca(OH) 2 and CaSO 4 ·2H 2 O were investigated. Reaction rate constants for Ca(OH) 2 and CaSO 4 ·2H 2 O dissolution were determined. The kinetic models were implemented within the Aspen Plus simulation platform.

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Understanding the Precipitated Calcium Carbonate (PCC ...

is an intricate interplay amid thermodynamic and kinetic factors.9 TheworkbyCiullo10 showsthathighpurityPCC(>95%)canbe produced using pseudo-catalytic lixiviant to selectively extract calcium from slag material before being dissolved as PCC. Also Adams11 showed that high purity PCC can be produced from

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Process for obtaining precipitated calcium carbonate ...

Apr 07, 2015· The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH) 2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH) 2, based upon moles of Ca(OH) 2 prior to or during carbonation; forming an …

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(PDF) Growth kinetics, oxygen production and nutrient ...

The present study evaluates the effect of different [N] sources on growth kinetics, oxygen production and nutrient assimilation profiles of Arthospira sp. PCC 8005 under the uncontrolled (flask ...

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Oscillation Kinetics of Post-illumination Increase in Chl ...

After termination of longer-illumination (more than 30 s), the wild type of Synechocystis PCC 6803 showed the oscillation kinetics of post-illumination increase in Chl fluorescence: a fast phase followed by one or two slow phases. Unlike the wild type, ndh-B defective mutant M55 did not show any post-illumination increase under the same conditions, indicating that not only the fast phase, but ...

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Nonlinear kinetic modelling of anaerobic biodegradation of ...

Gas production was found to follow a typical trend that has previously been described by first order reaction kinetics; for the purpose of fitting the linearisation, it requires a value for ...

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Retention of PCC and GCC fillers on chemical pulp fines ...

Retention of PCC and GCC fillers on chemical pulp fines surfaces. ... in more detail by measuring the kinetics of PCC adsorption in the absence of flocculant. ... a large extent in the production ...

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A Trend to the Production of Calcium Hydroxide and ...

In this paper, production of precipitated calcium carbonate (PCC) with required particle size and morphological structure, along with its dependence on technological parameters and the properties of Ca(OH) 2, is discussed.The effect of the reaction environment on the kinetics of CaO hydration and the formation of crystals in water suspension was established.

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The Strength of Persistent Antigenic Stimulation Modulates ...

A kinetic comparison of the onset of the tolerance process in the PCC-hi and PCC-lo recipients revealed interesting differences. Down-regulation of IL-2 production in the PCC-hi host was completely achieved between days 4 and 5 (Fig. 4 a), whereas in the PCC-lo host

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Lauri Loo - Energy Modeler - R8 TECHNOLOGIES | LinkedIn

The PCC consisted of >98% CaCO3; the main impurity was CaSO4. Traces of iron, potassium, chloride, magnesium and sodium were registered. Experiments on semicontinuous device showed that an inclined settler is sufficient for separating ~99% of the solids from the Carich solution. Estonian OS ashes can be used for PCC production. Show more Show less

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Simulating cyanobacterial phenotypes by integrating flux ...

@article{osti_1618798, title = {Simulating cyanobacterial phenotypes by integrating flux balance analysis, kinetics, and a light distribution function}, author = {He, Lian and Wu, Stephen G. and Wan, Ni and Reding, Adrienne C. and Tang, Yinjie J.}, abstractNote = {In this study, genome-scale models (GSMs) are widely used to predict cyanobacterial phenotypes in photobioreactors (PBRs).

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Flocculation kinetics of precipitated calcium carbonate ...

Consequently, the kinetics of aggregation of scalenohedral precipitated calcium carbonate (PCC) filler was studied using various polymers (flocculants, coagulants and dry strength agents). The sodium salt of partially hydrolysed polyvinyl formamide copolymerized with acrylic acid (PVFA/NaAA) or C-starch lead to floc sizes, less sensitive to ...

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Early-age hydration characteristics and kinetics of ...

The liquid water was replaced by ice particles for preparing homogenous structural Portland cement (PC) pastes at super low w/c ratios from 0.08 to 0.…

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Agglomeration Mechanisms and Kinetics during the ...

growth kinetics are presented elsewhere[1], while the aim of this work is to clarify the mechanism and to qua n-tify the kernel expression during the agglomeration of calcite particles. Indeed, this phenomenon sensibly influ-ences the end use properties of the PCC.

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Toward rational design of amine solutions for PCC ...

Toward rational design of amine solutions for PCC applications: the kinetics of the reaction of CO2(aq) with cyclic and secondary amines in aqueous solution. [William Conway, Xiaoguang Wang, Debra Fernandes, Robert Burns, Geoffrey Lawrance, Graeme Puxty, Marcel Maeder] PMID 22620675

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