Formula: Al2H8O13S3. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Assessment of fixed bed of aluminum infused diatomaceous earth as appropriate technology for groundwater defluoridation. Author is Oladoja, N. A.; Drewes, J. E.; Helmreich, B..
Excessive occurrence of F- in groundwater supplies is a major issue in many regions of the world. In order to produce a reactive filter (AD) for use as an appropriate groundwater defluoridation technol., the classical co-precipitation method was adopted to enrich diatomaceous earth with alumina. In a laboratory-scale water system, the breakthrough profile, fixed bed operation parameters and the mass transfer parameters of an AD column reactor were determined to obtain design parameters for real GW defluoridation applications. The defluoridation process variables studied (i.e., AD bed height and initial F- concentration) had a direct impact on column breakthrough and operating parameters. The mass transfer anal. revealed that external and internal diffusion were not the rate-limiting step of the defluoridation process in the column reactor. Considering the magnitude of the desorbed F- and the phys. integrity of the spent AD using selected regeneration solvents (HCl, HNO3, H2SO4, NaOH and CH3COOH) at 2 different concentrations (0.1 and 0.05M), CH3COOH was identified as the most suitable solvent to regenerate spent AD. The presence of a substantial amount of total inorganic C (68 mg/L), whose dominant species is HCO3-, resulted in a decrease in defluoridation efficiency using real groundwater. Based on the physicochem. characteristics of the AD reactor effluents, we proposed a non-specific mode of adsorption as one of the underlying defluoridation mechanism. This was in addition to the specific mode of adsorption that was revealed earlier as the underlying mechanism of F- removal using AD.
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