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Chemical Destruction
Published in Domenic Grasso, Hazardous Waste Site Remediation, 2017
pH will have a great effect on the overall rate of hydrolysis constant, especially for acid-or-base catalyzed reactions. Figure 2.11 shows the pH dependence of the hydrolysis rate. There are complex pH rate profiles for organic species that undergo acid:base dissociation in the environmental pH range of 5-9 1.
A simple kinetic model applied to anaerobic digestion of cow manure
Published in Environmental Technology, 2021
Iván López, Martín Benzo, Mauricio Passeggi, Liliana Borzacconi
As a result of the BMP curve adjustment to first-order kinetics, the values of hydrolysis constants at 30°C were obtained: kh1 = 0.234 d−1 and kh2 = 0.058 d−1. Applying the temperature correction, at 37°C, were obtained kh1 = 0.278 d−1 and kh2 = 0.069 d−1. These values agree to those obtained for the hydrolysis of cow manure in literature. Neves et al. [35] found a hydrolysis constant value of 0.263 and 0.354 d−1 for adapted and non-adapted to lipids inocula, and remark that results are strongly dependent on the experimental conditions, namely temperature, pH, particle size, stirring conditions, inoculum/substrate ratio. Momoh et al. [36] postulate a refined model based on the superficial attack on solid particles and find a range of values for the first order constant between 0.091 and 0.137 d−1; they works with crushed manure in batch conditions at 28°C. Emre Akman et al. [37] found a value of 0.347 d−1 for the hydrolysis constant of cow manure and the value decreases when added a high fraction of tomato residues. This suggest that more cellulosic material fraction implies a lower value of the hydrolysis constant. Manure used in this work comes from cows fed with natural grass, and therefore with a higher lignocellulosic content. Then, it is a logical result that relatively low values of the hydrolysis constant were obtained. Ma et al. [38] works at 22°C and found a hydrolysis constant value of 0.43 d−1, for flushed manure; this relatively higher value could be due to the fact of working with a rather diluted residue and with a high substrate inoculum ratio.
An overview of zeolites synthesised from coal fly ash and their potential for extracting heavy metals from industrial wastewater
Published in Canadian Metallurgical Quarterly, 2023
Sofi Buzukashvili, Rob Sommerville, Neil A. Rowson, Kristian E. Waters
Additionally, He et al. [195] studied the maximum adsorption capacities of CFA zeolite prepared using the fusion method. This study worked with single and mixed cations in aqueous solutions focusing on Pb, Cu, Cd, Ni, and Mn ions. It reported, that the absolute Ni2+ adsorption capacity is 34 mg/g for a single ion system and 16 mg/g in a multi-ion system with an adsorption efficiency of 85 ± 0.5% in a multi-ion system. In this work, it was indicated that the main factor impacting the selectivity adsorption was the hydrolysis constant.
Synergistic Solvent Extraction of Erbium(III) using a Mixture of Neodecanoic Acid with 1-(2-Neononylamidoethyl)-2-Neononyl-2-Imidazoline
Published in Solvent Extraction and Ion Exchange, 2023
Svetlana Bondareva, Yury Murinov
Where β1 is the stability constant for (the first hydrolysis constant). The combination of (10) and (11) gives