As an absorbent dark tea residue can get rid of heavy metal ion effectually and do no harm to the environment. From the dynamic experiment on dark tea residue's absorption of Cr(VI), the absorption dynamic curve and absorption isothermal curve are obtained. The effects of pH value, initial concentration, dosage of residue, adsorption time and other factors on absorption are studied and the result shows that: when the pH value of the waste water is 2, the initial concentration is 100mg/L, the adsorption time is 60min, the dosage of dark tea residue is 1g, the maximum adsorption rate reaches 99....
