摘要
以南京某生活垃圾焚烧厂的炉渣为研究对象,对其开展了颗粒分析、相对密度、固结压缩、渗透、持水量、浸出液水质分析等试验。结果表明:炉渣的平均粒径d_(50)为4.98 mm,不均匀系数C_u为8.51,曲率系数C_c为1.12,属于级配良好土;炉渣的固结系数C_v为0.15~1.06 cm^2/s,修正压缩指数C′e为0.12,压缩系数av1~2为0.451 MPa^(-1),属于中压缩性土;炉渣的平均相对密度Gs为2.86,最优干密度ρ_d为1.58 g/cm^3;炉渣的湿基持水量Fw为18%~19%,随上覆应力的增大变化不明显;炉渣的渗透系数k随上覆应力的增大而显著下降,随孔隙比e的变化关系为lg k=0.918 6e-2.877 3;炉渣的浸出液中典型重金属浸出浓度均低于危险废物鉴别标准,但pH、COD、BOD5和铅浓度均超过V类地表水标准限值。上述试验结果能够为炉渣的填埋处置或资源化利用提供重要的理论依据和数据支撑。
Taking bottom ash obtained from a municipal solid waste incineration(MSWI)in Nanjing for research object,the experiment of particle size distribution,relative density,compression coefficient,hydraulic conductivity,field capacity and leaching toxicity were carried out. The mean diameter d(50) of bottom ash was obtained as 4.98 mm,nonuniform coefficient(Cu)and curvature coefficient(Cc)were 8.51 and 1.12 respectively,which belonged to a type of well graded soil. Consolidation coefficient(Cv)of bottom ash was in the range of 0.15 to 1.06 cm^2/s,modified compression index(C'e)and compression coefficient av1~2 were obtained as 0.12 and 0.451 MPa-1 respectively,which belonged to the medium-compressive soil. Average relative density(Gs)was 2.86,and optimum dry density(ρd)was about 1.58 g/cm^3. Field capacity(Fw)was in the range of 18% to 19%on wet mass basis,which was insensitive to the increase of overburden pressure. Hydraulic conductivity significantly decreased with the increase of overburden pressure. The relationship between the hydraulic conductivity k and porosity ratio e was represented by the formula as lg k = 0.918 6 e-2.877 3. The leaching toxicity of typical heavy metals in lixivium of bottom ash was below the limits of identification standards for hazardous wastes. However,p H and concentrations of CO D,BOD5 and Pb were ahead of environmental quality standards for surface water of type V. The results above could provide important theoretical basis and data support for landfill disposal or resource utilization of bottom ash.
作者
程曦
朱广
徐辉
缪建冬
陈萍
Cheng Xi;Zhu Guang;Xu Hui;Miao Jiandong;Chen Ping(Nanjing Urban Construction Project Management Co.Ltd.,Nanjing Jiangsu 210006;College of Architecture Engi neering,Zhejiang Sei-Teeh Universiu,Hangzhou Zhejiang 310018;MOE Key Laboratory of Soft Soils and Environ mental Geoteehnieal Engineering,Zhejiang University,Hangzhou Zhejiang 310058)
出处
《环境卫生工程》
2018年第3期18-22,共5页
Environmental Sanitation Engineering
基金
国家自然科学基金面上项目(5157081460)
住建部科技计划项目(2015R3002)
软弱土与环境土工教育部重点实验室(浙江大学)开放基金项目(2017P03)
关键词
垃圾焚烧炉渣
颗粒级配
压缩性
渗透性
持水量
bottom ash in MSWI
particle distribution
compression
permeability
field capacity