A high level treatment of fluorine wastewater to reduce sludge

A novel technique for treating fluorine wastewater has been developed in order to reduce sludge. This technique utilizes the dependence of solubility and adsorption characteristics of Al(OH)₃ gel on pH, and uses Al(OH)₃ gel itself repeatedly as a fluorine adsorbent. The reclamation process of Al(OH)₃ gel involves varying the pH level of its slurry to allow Al(OH)₃ gel to desorb fluorine and be dissolved as an aluminate ion. This technique can treat fluorine wastewater to several ppm at low-cost, and reduce the resulting volume of sludge to a level one-thirtieth the amount produced by the conventional treatment method