东南大学学报（自然科学版）2016，Vol.46Issue(6)：1301-1307,7.DOI:10.3969/j.issn.1001-0505.2016.06.032
湖泊淤泥与生活污泥复合烧结砖的制备、性能及环境安全性
Preparation,properties and environmental safety of fired bricks made from lake silt and sewage sludge
摘要
Abstract
A vacuum plastic extruder in laboratory was employed to make the brick samples with lake silt,cinder and sewage sludge as primary raw material,coarse aggregate and pore-forming agent.An optimal combination of the linear drying shrinkage (5 .35%), water absorption (16.5%)and compressive strength (20.5 MPa)was achieved for fired bricks made from 85%lake silt,10% cinder and 5% sewage sludge,respectively.Gases released during sintering process were analyzed by the combined technique of high resolution gas chromatography and high resolution mass spectrometry (HRGC/HRMS)according to the specification HJ 77.2—2008 (ambient air and flue gas determination of polychlorinated dibenzo-p-dioxins (PCDDs)and polychorinated dibenzofurans (PCDFs)isotope dilution HRGC-HRMS)for testing the PCDDs/PCDFs in environment and waste gas by HRGC/HRMS.The results show that the toxic equivalent of PCDDs/PCDFs is 0.176 ngTEQ/m3,which is much less than 1 ngTEQ/m3,specified in GB 18485—2014 (standard for pol-lution control on the municipal solid waste incineration).Heavy metal leaching tests show that heavy metals in bricks are lower than that specified in specification for leaching toxicity evaluation of dan-gerous wastes GB 5085 .3—2007 (identification standards for hazardous wastes—identification for extraction toxicity)for about 5 orders of magnitudes,demonstrating that heavy metals are effectively immobilized.Thus the environment would not be polluted by the use of the bricks.关键词
湖泊淤泥/污泥/烧结砖/重金属/二噁英Key words
lake silt/sewage sludge/fired brick/heavy metal/dioxins分类
建筑与水利引用本文复制引用
贾鲁涛,崔强,梅浩,张亚梅,张培根,孙正明..湖泊淤泥与生活污泥复合烧结砖的制备、性能及环境安全性[J].东南大学学报（自然科学版）,2016,46(6):1301-1307,7.基金项目
国家自然科学基金资助项目（51378115）． （）
