污泥-烟煤基活性炭的制备及其对苯酚的吸附性能  

Activated carbon from biological sludge blended with bituminous coal:preparation and its phenol adsorption properties

作　　者：黄冬艳[1] 李娟[1] 江萍[2] 黄朝晖[2] 邵嘉慧[3] 石美[1] 张良[1] 郭彩阳 郑建中[1] 

机构地区：[1]中国科学院大学资源与环境学院,北京101408 [2]中国石油化工股份有限公司镇海炼化分公司,镇海315207 [3]上海交通大学环境科学与工程学院,上海200240

出　　处：《环境工程学报》2016年第10期5931-5936,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41473098);中国科学院战略性先导科技专项(B类)(XDB10030604)

摘　　要：以石化企业在污水处理过程中产生的干化剩余污泥为原料,大同烟煤作辅助添加料,采用化学活化法制备污泥-烟煤基活性炭,探讨了活化剂(ZnCl_2)用量、活化温度、活化时间等条件对所制备的活性炭性能的影响。以活性炭的碘吸附值为衡量指标,当污泥∶烟煤(质量比)=1∶1时获得制备污泥-烟煤活性炭的最佳工艺条件为:浸渍液为ZnCl_2∶原料(质量比)=2∶1,活化温度550℃,活化时间30 min,在该条件下制备的活性炭的碘吸附值为990 mg·g^(-1),比表面积为836m^2·g^(-1),产率为46.6%。同时,以苯酚为目标污染物,考察了所制备的污泥-烟煤基活性炭对苯酚的去除效果,结果表明:污泥-烟煤基活性炭投加量为2.0 g·L^(-1)时,4 h后达到吸附平衡,离子强度对吸附容量没有显著的影响,溶液pH在4~10范围内对苯酚有较好吸附,pH=6时苯酚吸附容量为138.9 mg·g^(-1)。与同类吸附剂相比,制备的污泥-烟煤基活性炭可高效吸附水溶液中的苯酚。Biological sludge from a petrochemical wastewater treatment plant and Datong bituminous coal were blended to prepare activated carbons,by chemical activation method using ZnCl2 as the activation reagent.The effects of ZnCl2 dosage,activation temperature and time on iodine adsorption values of the prepared activated carbon were investigated. Experimental results showed that,for a 1 ∶ 1 blending ratio of sludge to coal mass,the optimal conditions for activated carbon preparation were： activation temperature of 550 ℃,ZnCl2∶ solids（ weight rate） = 2 ∶ 1,and activation time of 30 min. The sludge-coal based activated carbon（ SC-AC） thus prepared had an iodine number of 990 mg·g-1,BET surface area of 836 m2·g-1,with a mass yield of 46. 6%. Phenol adsorption experiments showed that the SC-AC had a good performance for phenol removal across a wide pH range from 4 to 10,with the highest adsorption capacity for phenol of 138. 9 mg·g-1achieved at pH of 6. Further tests indicated that ionic strength had a very limited effect on adsorption capacity.

关 键 词：生化污泥 烟煤 化学活化 活性炭 碘值 苯酚吸附 

分 类 号：X705[环境科学与工程—环境工程]