Multi-step fluorine and silicon removal method for high-salinity wastewater

• Main Authors: ZHANG CHUN, DONG KAI, ZHAO HONGLIANG, CHENG JUNJUN, WU ZHENGLEI, ZHUANG LI, ZHOU MING, PENG WENBO
• Format: Patent
• Language: Chinese; English
• Published: 30.05.2023
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a process for efficiently removing fluorine and silicon from high-salinity wastewater by a multi-step method, which comprises the following steps: feeding high-salinity wastewater into a primary fluorine removal device, slowly adding a sodium metaaluminate solution into a fluorine removal agent adding device, synchronously and slowly adjusting the pH value by an acid controller at a constant speed and keeping the pH value at 3.5-4.5, feeding the wastewater into a deep fluorine removal device, and feeding the wastewater into a secondary fluorine removal device; after the sodium metaaluminate solution is slowly added into the fluorine removal agent adding device, the pH is slowly adjusted to 4.5-6.0 at a constant speed. After the reaction is finished, the sedimentation and adsorption processes are completed under a neutral condition, the wastewater enters a silicon removal device to be subjected to a silicon removal step, after the sodium metaaluminate solution is slowly added into a sil