Velazquez, S.

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Chemical activation of pozzolanic reaction of fluid catalytic cracking catalyst residue (FC3R) in lime pastes: thermal analysis
(2004)
J. Paya
;
J. Monzo
;
M. V. Borrachero
;
Velazquez, Sergio
19Scopus© Citations 21
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Evaluation of the pozzolanic activity of spent FCC catalyst/fly ash mixtures in Portland cement pastes
(2016)
Velazquez, Sergio
;
J. Monzó
;
M.V. Borrachero
;
L. Soriano
;
J. Payá
1Scopus© Citations 57 6
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Pozzolanic reaction rate of fluid catalytic cracking catalyst residue (FC3R) in cement pastes
(2013)
Payá, Jordi
;
Monzó, José M.
;
Borrachero, María V.
;
Velazquez, Sergio
<jats:p> Fluid catalytic cracking catalyst residue (FC3R) is a waste material generated in the petroleum industry. Previous research has shown that FC3R exhibits excellent pozzolanic properties in Portland cement mixtures. The pozzolanic activity of FC3R was studied by means of thermogravimetric analysis (measurement of lime fixation) and cold hydrochloric acid treatment (quantification of FC3R reacted). A water/binder ratio of 0·40 was used in the study in the preparation of a control paste (without spent catalyst) and a 15% substituted FC3R paste. The selected curing temperatures were 20 and 40°C and several curing times were tested. The amount (grammes) of fixed lime by gramme of reacted catalyst indicated that approximately one part lime is chemically combined with 2·3 parts of spent catalyst. The combination of both study techniques allows determination of the optimal dosage in order to maximise use of this excellent pozzolan. </jats:p>
Scopus© Citations 20 2 11
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Evaluation of the pozzolanic activity of fluid catalytic cracking catalyst residue (FC3R). Thermogravimetric analysis studies on FC3R-Portland cement pastes
(Wiley, 2003)
J Payá
;
J Monzó
;
M.V Borrachero
;
Velazquez, Sergio
Scopus© Citations 151 18
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Spent fluid catalytic cracking catalyst for improving early strength of portland cement
(2014-01-01)
Velazquez, Sergio
;
Borrachero, María V.
;
Monzó, José M.
;
Payá, Jordi
;
Vunda, Christian
15
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Assessment of Pozzolanic Activity Using Methods Based on the Measurement of Electrical Conductivity of Suspensions of Portland Cement and Pozzolan
(2014)
Velazquez, Sergio
;
José Monzó
;
María Borrachero
;
Jordi Payá
Scopus© Citations 11 1 13
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A thermogravimetric study of the pozzolanic reactions in mixtures containing fluidized catalytic cracking catalyst, fly ash, cement and water
(CANMET / ACI, 2004)
Velazquez, Sergio
34
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Assessment of the Pozzolanic Activity of a Spent Catalyst by Conductivity Measurement of Aqueous Suspensions with Calcium Hydroxide
(2014)
Velazquez, Sergio
;
José Monzó
;
María Borrachero
;
Jordi Payá
Scopus© Citations 14 1 4
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Advantages in the use of fly ashes in cements containing pozzolanic combustion residues: silica fume, sewage sludge ash, spent fluidized bed catalyst and rice husk ash
(2002)
J Payá
;
J Monzó
;
M V Borrachero
;
F Amahjour
;
I Girbés
The enhancement in the workability of Portland cement concrete when coal fly ashes are added to the mix is well‐known. This behaviour has been attributed to the spherical shape and the smooth surface of the fly ash particles. On the other hand, when other combustion residues with pozzolanic properties are added to concrete mix formulations, a loss in workability is observed, and an increase in water content may be necessary for obtaining a satisfactory plastic consistency of the concrete, or alternatively chemical additives may be used (plasticizers and superplasticizers). The effect of the combination of fly ash with other mineral admixtures in respect of the effect on the workability of mortars has been studied. The pozzolanic combustion residues examined were: silica fume, sewage sludge ash, spent fluid catalytic cracking catalyst and rice husk ash. Additionally, and due to the pozzolanic properties of coal fly ash and these residues, the strength developments of Portland cement mortars containing fly ash and the selected admixtures have also been measured
Scopus© Citations 64 17
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Evaluation of nutrients removal (NO3-N, NH3-N and PO4-P) with Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and a consortium of these microorganisms in the treatment of wastewater effluents
(2017)
Abril Gómez-Guzmán
;
Sergio Jiménez-Magaña
;
A. Suggey Guerra-Rentería
;
César Gómez-Hermosillo
;
F. Javier Parra-Rodríguez
<jats:p>In this research removal of NH3-N, NO3-N and PO4-P nutrients from municipal wastewater was studied, using Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and an artificial consortium of them. The objective is to analyze the performance of these microorganisms and their consortium, which has not been previously studied for nutrient removal in municipal wastewater. A model wastewater was prepared simulating the physicochemical characteristics found at the wastewater plant in Chapala, Mexico. Experiments were carried out without adding an external carbon source. Results indicate that nutrient removal with Chlorella vulgaris was the most efficient with a removal of 24.03% of NO3-N, 80.62% of NH3-N and 4.30% of PO4-P. With Bacillus cereus the results were 8.40% of NO3-N, 28.80% of NH3-N and 3.80% of PO4-P. The removals with Pseudomonas putida were 2.50% of NO3-N, 41.80 of NH3-N and 4.30% of PO4-P. The consortium of Chlorella vulgaris–Bacillus cereus–Pseudomonas putida removed 29.40% of NO3-N, 4.2% of NH3-N and 8.4% of PO4-P. The highest biomass production was with Bacillus cereus (450 mg/l) followed by Pseudomonas putida (444 mg/l), the consortium (205 mg/l) and Chlorella vulgaris (88.9 mg/l). This study highlights the utility of these microorganisms for nutrient removal in wastewater treatments.</jats:p>
2Scopus© Citations 26 10

Velazquez, S.

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