Preparation technology and performance of activated carbon for drinking water treatment from Xinjiang coal

Xinjiang has large coal reserves,abundant coal resources,diversified coal types,low ash content and high activity.It is a highquality raw material for preparing coal-based activated carbon for water treatment. Activated carbon was prepared from raw coal of main mining areas in Xinjiang by coal blending and pressing process. The effects of pre-oxidation,carbonization and activation conditions and catalysts on the performance of activated carbon were investigated. The preparation process and main parameters of activated carbon for drinking water treatment were optimized.The adsorption energy of activated carbon on TOC,CODMnand UV254 was characterized.The results show that the iodine adsorption values of 1 200-1 320 mg/g、the adsorption value of methylene blue is 280-290 mg/g and the average strength is 95%,and the loading density is 470-485 g/L can be prepared by blending Hami coal and Kuangou coal with ash less than 5%,volatile matter 35% and moisture 3%-6% at the ratio of 60 ∶ 40,adding potassium-containing compound catalyst and oxidized 180-200 min at 250 ℃,carbonized 150-180 min at 530-560 ℃,activated at 920-940 ℃.The removal rates of TOC,COD and UV254 in drinking water treatment based on coal-based activated carbon products produced in Xinjiang are 38%,42% and 67%,respectively. It shows that coal-based activated carbon products produced in Xinjiang coal-based drinking water treatment have better adsorption properties than F-400 produced by Carlgang Company in the United States.