Coagulative Precipitation and Adsorption Removal of Boron from the Wastewater.

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Coagulation experiments with aluminum sulfate or iron (II) sulfate, as an inorganic coagulant, and adsorption experiments with activated carbon or activated alumina were conducted in order to find optimum condition for the removal of boron from the wastewater. The following results were obtained from the experiments.<BR>From the coagulation experiments, a removal ratio of 0.95 was obtained by the addition of hydrogen peroxide and calcium hydroxide to the borate-contained wastewater when aluminum sulfate was used and the pH was adjusted to 9. A large amount of the removed boron was considered to be adsorbed on the surface of resulting precipitates since higher concentration of boron was observed at the early stage of dissolution of the precipitate with a diluted HCl solution.<BR>From the adsorption experiments, it was found that activated carbon was capable of adsorbing borate. An adsorption amount of 0.14 mg-B/g-adsorbent was observed when the solution of 10 mg-B/l was in contact with activated carbon at 25 °C for 72 hours, and the capacity is larger than that of activated alumina.
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