掺加矿粉胶凝固化垃圾焚烧飞灰中重金属的研究
|
摘要
通过单因素实验探究了矿粉质量分数、激发剂(NaOH)投加量和加水量对掺加矿粉胶凝固化垃圾焚烧飞灰中重金属的影响,并初步探究了固化机理。结果表明,矿粉质量分数和激发剂投加量对重金属的固化影响较大,而加水量影响不大。综合考虑增容比、重金属浸出浓度和抗压强度,矿粉质量分数15%、激发剂投加量3%(质量分数)、加水量37.5%(质量分数)为有效稳定固化重金属的最佳条件,此时重金属浸出质量浓度分别是Ba 19.091mg/L、Cd 0.041mg/L、Ni 0.216mg/L、Pb 0.196mg/L,含水率为27.04%,满足《生活垃圾填埋场污染控制标准》(GB 16889—2008),抗压强度为9.61 MPa,可进入垃圾填埋场填埋。所制备胶凝材料的最终水化产物主要为水化硅酸钙、水化铝硅酸钙和钙矾石,它们可以通过包裹和吸附对重金属进行固化。
The effects of mineral powder mass percentage,activator(NaOH)dosage and water addition on the solidification by single factor experiments were explored.In addition,the mechanism was simply explored.Results showed that mineral powder mass percentage and activator dosage were conducive to the solidification but water addition not.Considering the volume ratio,the leaching concentration of heavy metal and compressive strength,the optimal condtions were that mineral powder mass percentage was 15%,activator dosage 3%(mass percentage)and water addition 37.5%(mass percentage).Under the optimal conditions,the leaching concentration of heavy metals was Ba 19.091 mg/L,Cd 0.041 mg/L,Ni 0.216 mg/L and Pb 0.196 mg/L with moisture content 27.04% and compressive strength 9.61 MPa,meeting"Standard for pollution control on the landfill site of municipal solid waste"(GB 16889-2008),which could be entered into the landfill site.The main hydration products of solidified material were calcium silicate hydrate,calcium aluminosilicate hydrate and ettringite.They could solidify heavy metals by inclusion and adsorption.
The effects of mineral powder mass percentage,activator(NaOH)dosage and water addition on the solidification by single factor experiments were explored.In addition,the mechanism was simply explored.Results showed that mineral powder mass percentage and activator dosage were conducive to the solidification but water addition not.Considering the volume ratio,the leaching concentration of heavy metal and compressive strength,the optimal condtions were that mineral powder mass percentage was 15%,activator dosage 3%(mass percentage)and water addition 37.5%(mass percentage).Under the optimal conditions,the leaching concentration of heavy metals was Ba 19.091 mg/L,Cd 0.041 mg/L,Ni 0.216 mg/L and Pb 0.196 mg/L with moisture content 27.04% and compressive strength 9.61 MPa,meeting"Standard for pollution control on the landfill site of municipal solid waste"(GB 16889-2008),which could be entered into the landfill site.The main hydration products of solidified material were calcium silicate hydrate,calcium aluminosilicate hydrate and ettringite.They could solidify heavy metals by inclusion and adsorption.
引文
[1] GALIANO Y L,PEREIRA C F,VALE J.Stabilization/solidification of a municipal solid waste incineration residue using fly ash-based geopolymers[J].Journal of Hazardous Materials,2011,185(1):373-381.
[2]李琛.持续推进垃圾焚烧飞灰无害化资源化减量化处理[N].中国建材报,2017-12-21(3).
[3] BERTOLINI L,CARSANA M,CASSAGO D,et al.MSWI ashes as mineral additions in concrete[J].Cement and Concrete Research,2004,34(10):1899-1906.
[4] WANG K S,LIN K L,HUANG Z Q.Hydraulic activity of municipal solid waste incinerator fly-ash-slag-blended eco-cement[J].Cement and Concrete Research,2001,31(1):97-103.
[5]李春梅,王培铭.碱激发胶凝材料的研究进展[J].混凝土,2014(12):60-68.
[6]权娟娟,王宁,郭磊,等.碱矿渣胶凝体系的水化特性及机理分析[J].硅酸盐通报,2016,35(7):2171-2176.
[7]齐一谨,徐中慧,徐亚红,等.粉煤灰固化处理生活垃圾焚烧飞灰效果研究[J].环境科学与技术,2017,40(6).
[8]何品晶,曹群科,章灿钢,等.飞灰的自然老化及其对重金属浸出性的影响[J].同济大学学报(自然科学版),2006,34(6):770-775.
[9]张大捷,刘文士,田晓峰,等.矿渣胶结材固化处理垃圾焚烧飞灰[J].环境工程,2008,26(4):14-16.
[10]金漫彤.地聚合物固化生活垃圾焚烧飞灰中重金属的研究[D].南京:南京理工大学,2011.
[11]杨敬斌,方媛,李东旭.碱胶凝材料水化产物C-A-S-H与N-AS-H的研究进展[J].硅酸盐通报,2017,36(10):3292-3310.
[12]邵雁.矿渣基胶凝材料固化稳定化垃圾焚烧飞灰机理研究[D].武汉:武汉大学,2014.
[13] LEE T C,LI Z S.Conditioned MSWI ash-slag-mix as a replacement for cement in cement mortar[J].Construction and Building Materials,2010,24(6):970-979.
[14]曹亚丽,钱光人.利用城市垃圾焚烧飞灰稳定固化含重金属工业污泥的试验研究[J].环境工程,2008,26(增刊):235-240.
[15]卢涌泉,邓振华.实用红外光谱解析[M].北京:电子工业出版社,1989.
[16]周欢.碱矿渣水泥固化城市生活垃圾焚烧飞灰效率研究[D].重庆:重庆大学,2013.
[2]李琛.持续推进垃圾焚烧飞灰无害化资源化减量化处理[N].中国建材报,2017-12-21(3).
[3] BERTOLINI L,CARSANA M,CASSAGO D,et al.MSWI ashes as mineral additions in concrete[J].Cement and Concrete Research,2004,34(10):1899-1906.
[4] WANG K S,LIN K L,HUANG Z Q.Hydraulic activity of municipal solid waste incinerator fly-ash-slag-blended eco-cement[J].Cement and Concrete Research,2001,31(1):97-103.
[5]李春梅,王培铭.碱激发胶凝材料的研究进展[J].混凝土,2014(12):60-68.
[6]权娟娟,王宁,郭磊,等.碱矿渣胶凝体系的水化特性及机理分析[J].硅酸盐通报,2016,35(7):2171-2176.
[7]齐一谨,徐中慧,徐亚红,等.粉煤灰固化处理生活垃圾焚烧飞灰效果研究[J].环境科学与技术,2017,40(6).
[8]何品晶,曹群科,章灿钢,等.飞灰的自然老化及其对重金属浸出性的影响[J].同济大学学报(自然科学版),2006,34(6):770-775.
[9]张大捷,刘文士,田晓峰,等.矿渣胶结材固化处理垃圾焚烧飞灰[J].环境工程,2008,26(4):14-16.
[10]金漫彤.地聚合物固化生活垃圾焚烧飞灰中重金属的研究[D].南京:南京理工大学,2011.
[11]杨敬斌,方媛,李东旭.碱胶凝材料水化产物C-A-S-H与N-AS-H的研究进展[J].硅酸盐通报,2017,36(10):3292-3310.
[12]邵雁.矿渣基胶凝材料固化稳定化垃圾焚烧飞灰机理研究[D].武汉:武汉大学,2014.
[13] LEE T C,LI Z S.Conditioned MSWI ash-slag-mix as a replacement for cement in cement mortar[J].Construction and Building Materials,2010,24(6):970-979.
[14]曹亚丽,钱光人.利用城市垃圾焚烧飞灰稳定固化含重金属工业污泥的试验研究[J].环境工程,2008,26(增刊):235-240.
[15]卢涌泉,邓振华.实用红外光谱解析[M].北京:电子工业出版社,1989.
[16]周欢.碱矿渣水泥固化城市生活垃圾焚烧飞灰效率研究[D].重庆:重庆大学,2013.