Abstract
Abstract Batch experiments carried out on dilute solutions of organic acids (oxalic, maleic, benzoic and salicylic acids, humic substances) showed that activated alumina γ‐Al2O3 removed these solutes from water. The removal of organic acids was optimum in an acid medium (4 < pH < 6) and was significantly affected by the presence of inorganic anions. Filtration experiments showed competitive fixation of organic acids on γ‐Al2O3. Activated alumina could be regenerated by sodium hydroxide solutions but an important loss of efficiency of the filters was observed for the salicylic acid removal during 5 exhaustion‐regeneration cycles. A comparative study showed clearly that granular activated carbon (F400) had higher adsorptive capacities and was a better support for bacterial growth than activated alumina y‐A12O3.
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