��̿��̎��像Uˮ�е�EDTA

��r(sh��)�g��2014-07-16 10:41 ��Դ��h(hu��n)��̌W(xu��)��(b��o) ��: ��x��2221

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��w�,��̿��(du��)ģ�M�Uˮ��EDTA�M(j��n)��ʽ��(sh��)�(y��n),�ڌ�(sh��)�(y��n)�п��˺��ʎ��ʎ�ٶ�,��ضȡ�pHֵ��،�(du��)��Ӱ�,ͬ�r(sh��)̽ӑ��Ȝؾ�ģ�ͺ��(d��ng)��W(xu��)ģ��,��(sh��)�(y��n)�Y(ji��)��,��25��r(sh��)��̿��(du��)EDTA��ƽ��r(sh��)�g��40 h,��pHֵ��5.0��ضȞ�25��,��ʎ��ʎ�ٶȞ�200 r/min,��̿��1~2 mm��̿��10 g/L��r��,EDTA�ĝ��48 h��(n��i)��368.8 mg/L��76.34 mg/L,��(du��)��(y��ng)��CODֵ��305.9 mg/L ��͞�67.21 mg/L,ȥ��_(d��)��79.3%,�,��̿��(du��)EDTA��Langmuir��Ȝؾ�ģ��,��О��Ü�(zh��n)��(j��)��(d��ng)��W(xu��)ģ�́��

Ӣ��ժҪ:

In this study, granular activated carbon was used to adsorb EDTA from simulated wastewater by conducting series of batch experiments. Several influencing factors were evaluated which included shaking speed of constant temperature oscillator, water temperature and pH value. In addition, the adsorption equilibrium isotherms model and adsorption kinetics model were investigated. The results show that it takes 40 h for the adsorption of EDTA to reach equilibrium at 25��. EDTA is reduced by 79.3% within 48 h, from 368.8 mg/L to 76.34 mg/L, under the conditions of pH value of 5.0, temperature of 25��, shaking speed of 200 r/min, grain size of 1~2 mm, activated carbon dosage of 10 g/L. Meanwhile COD value decreases from 305.9 mg/L to 67.21 mg/L. Furthermore, the adsorption of activated carbon on EDTA is best fitted with Langmuir adsorption model, the kinetic process of adsorption can be described by the pseudo-second-order kinetic model.

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