| 摘要 |
PROBLEM TO BE SOLVED: To provide an alkaline wastewater treatment method for removing fluorine, arsenic, selenium, and boron by neutralizing alkaline wastewater containing silicates, fluorine, arsenic, selenium and boron, generated when producing zeolite from cinder ash, and the like, such as coal ash, without the gelation of the silicates. SOLUTION: In the alkaline wastewater treatment method, after an alkaline earth metal salt is added to the alkaline wastewater containing the silicate, fluorine, arsenic, selenium, and boron, a mineral acid is added to neutralize the wastewater. An iron compound is added to supernatant liquid obtained by subjecting the wastewater to solid-liquid separation after addition of a coagulant, and then solid-liquid separation is performed after the addition of the coagulant to drain supernatant liquid. COPYRIGHT: (C)2005,JPO&NCIPI
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