Preparing polyaluminum chloride coagulants using ultrasonic-assisted NaOH dosing

作者：Cheng Wen Po^*; Li Chin Chang; Yu Ruey Fang

来源：Environmental Engineering Science, 2008, 25(3): 451-459.

DOI：10.1089/ees.2006.0262

• polyaluminum chloride
• ultrasonic vibrating system
• Ferron test
• residual aluminum

This study elucidates an ultrasonic vibration system to promote in alkalinity dosing, which is a new method for preparing polyaluminum chloride (PACl). The ultrasonic vibrating system breaks up the NaOH solution into a fine mist, which may be more evenly dispersed into the aluminum solution than preventing local over-saturation in polymerization. The coagulant was subjected to the Al-Ferron test to determine its composition, and jar tests to investigate its long-term stability. The results indicated that this ultrasonic-assisted NaOH dosing leads to a more stable polymerization of aluminum and OH- ions, increasing the proportion of Al-13 in the final product. After 2 months of aging, the PACl that had been prepared with ultrasonic-aided NaOH dosing at 0.25 mL/min, and also exhibited the best turbidity removal results.

• 出版日期2008-4