Preparation of Sludge Based Activated Carbon and its Adsorption Performance for Cr6+in Water
In this paper,the activated carbon was prepared from the excess sludge of municipal wastewater treatment plant,and activated with zinc chloride as activating agent by tube furnace and microwave digestion instrument,the adsorption of hexavalent chromium by diphenylcarbazide spectrophotometer(GB7466-87)was studied.The results showed that the adsorption capacity of activated carbon prepared by microwave digestion apparatus was very good.The adsorption rate of activated carbon from 1 g sludge was as high as 91%and the adsorption capacity was as high as 9.1 μg/g in 50 mL of CR(VI)solution with an initial concentration of 0.2 μg/mL.This new activated carbon preparation process not only solves the problem of residual sludge treatment,but also reuses the resource,which has a far-reaching impact on environmental protection.
sludge based activated carbonmicrowave pyrolysisadsorptionchromiumion
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