Experimental Study on Pure Montmorillonite in Treating Zn-containing Wastewater

LIU Jing-jing et al(Guilin Research Institute of Geology for Mineral Resources,Guilin,Guangxi 541004)

Pure montmorillonite;Zn-Containing Wastewater;Adsorption

[Objective] The study aimed to explore the factors and effects on treating Zn-containing wastewater by pure montmorillonite.[Method] The experiment had been done to investigate the pure montmorillonite in treating Zn-containing wastewater based on the purification of montmorillonite,the effecting factors of the pure montmorillonite on treating Zn-containing wastewater were explored,the technology conditions for removing the Zn in the wastewater by the pure montmorillonite were confirmed and the adsorbent isotherm curve of the pure montmorillonite to Zn2+was studied.[Result] The treating effects of pure montmorillonite on the Zn-containing wastewater were mainly affected by such factors as the vibrating rate,adsorption time,aqueous pH value and montmorillonite adding amount.Under the temperature of 30 ℃,the adsorption isotherm curve of the pure montmorillonite to Zn2+cloud more accord with Langmuir equation and BET equations,with the correlation coefficient of 0.986 9 and the biggest adsorption capacity of 39.00 mg/g.Under the this test condition,the process conditions for best effect of removing the Zn2+(20 ml,Zn2+concn.were all 50 mg/L) in the wastewater by the pure montmorillonite were as follows:the oscillation speed of 150 r/min,adsorption time of 60 min and solution pH value of 6.10,under which,the removal rate of Zn2+reached 85.3%.[Conclusion] The study provided the scientific basis for the application montmorillonite in developing the new materials used for the sewage treatment.