活性炭对医疗垃圾焚烧飞灰水泥固化的影响  

Effect of Activated Carbon on Cement Solidification of Hospital Waste Incineration Fly Ash

作　　者：刘汉桥[1,2] 魏国侠[1] 张曙光[2] 蔡九菊[3] 

机构地区：[1]天津城市建设学院能源与机械工程系,天津300384 [2]天津泰达环保有限公司,天津300350 [3]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《过程工程学报》2008年第5期953-956,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20806051);国家重点基础研究发展规划(973)基金资助项目(编号:2005CB724206)

摘　　要：对医疗垃圾焚烧飞灰(FA)及其灼烧灰(IFA)进行水泥固化实验研究,考察了飞灰中活性炭对水泥固化体凝结时间、抗压强度、重金属浸出毒性等的影响.结果表明,掺60%FA的水泥固化体终凝时间长达63h,超出48h的限值,相同IFA配比下水泥固化体终凝时间低于该值;掺40%和60%FA的水泥固化体7d的抗压强分别仅为0.187和0.16MPa,低于0.2MPa的标准,但2种IFA配比下水泥固化体的抗压强度均达标;掺40%和60%FA的水泥固化体中Pb的渗沥浓度分别为5.634和6.032mg/L,均超过5mg/L的限值,而掺60%IFA的水泥固化体Pb渗沥浓度超过限值.结果证实医疗垃圾焚烧飞灰中活性炭是导致水泥固化体凝结时间延长、抗压强度降低、重金属渗沥浓度升高的主要原因.The cement solidification tests of hospital waste incineration fly ash （FA） and of the ignited fly ash （IFA） were respectively carried out to ascertain the effect of activated carbon in FA on the solidification process. The results show that activated carbon in FA results in delay of setting, and decrease of compressive strength and excessive heavy metal leachability. The setting time of the cement mixture with 60% FA is prolonged up to 63 h, exceeding acceptable time of 48 h. The unconfined compressive strengths of the solidified products with 40% FA and 60% FA are respectively 0.187 and 0.16 MPa after 7 d below the minimum limit of 0.2 MPa. Conversely, the solidified products oflFA at the same ration can measure up in setting time and compressive strength. The Pb leaching concentrations of solidified products incorporating 40% FA and 60% FA are respectively 5.634 and 6.032 mg/L, which can not meet the leaching standard （5mg/L）. However, the solidified products incorporating 60% IFA are merely unacceptable.

关 键 词：医疗垃圾 飞灰 活性炭 水泥 固化 

分 类 号：X705[环境科学与工程—环境工程]