摘要
针对城市污泥中部分重金属含量超标的问题,以研制的新型钝化剂DTG-3为钝化材料,开展了城市污泥重金属钝化处理实验,重点考察了新型钝化剂DTG-3用量以及钝化处理时间对污泥中不同类型重金属形态分布的影响,并计算出不同处理条件下的重金属稳定系数。实验结果表明,新型钝化剂DTG-3的质量分数越大,钝化处理时间越长,城市污泥中重金属的钝化处理效果相对就越好;当钝化处理时间为28d时,与钝化处理前相比,城市污泥中不同类型的重金属的残渣态含量均有所增大。另外,随着新型钝化剂DTG-3质量分数的逐渐增大以及钝化处理时间的延长,城市污泥钝化处理后的不同类型重金属的稳定系数均有所减小。综合考虑,推荐新型钝化剂DTG-3的最佳质量分数为15%,最佳钝化处理时间为28d,此时目标城市污泥经过钝化处理后的重金属Cu、Pb、Cr和Zn的稳定系数可分别降低至5.17、0.68、4.13和11.99,钝化处理效果较好。
In response to the problem of excessive heavy metal content in urban sludge,a new passivation agent DTG-3 was developed as the passivation material to carry out heavy metal passivation treatment experiments on urban sludge.The focus was on investigating the effects of the dosage and passivation treatment time of the new passivation agent DTG-3 on the distribution of different types of heavy metal forms in sludge,and calculating the heavy metal stability coefficient under different treatment conditions.The experimental results show that the higher the mass fraction of the new passivation agent DTG-3,the longer the passivation treatment time,and the better the passivation treatment effect of heavy metals in urban sludge;When the passivation treatment time is 28 days,the residual content of different types of heavy metals in urban sludge increases compared to before passivation treatment.In addition,with the gradual increase of the mass fraction of the new passivation agent DTG-3 and the extension of passivation treatment time,the stability coefficients of different types of heavy metals after urban sludge passivation treatment have decreased.After comprehensive consideration,the recommended optimal mass fraction of the new passivation agent DTG-3 is 15%,and the optimal passivation treatment time is 28 days.At this time,the stability coefficients of heavy metals Cu,Pb,Cr,and Zn in the target city sludge after passivation treatment can be reduced to 5.17,0.68,4.13,and 11.99,respectively,indicating good passivation treatment effects.
作者
许庆
韩玉梅
李立伟
XU Qing;HAN Yu-mei;LI Li-wei(Environmental Monitoring Center of Yishui County,Linyi City,Linyi 276400,China)
出处
《化学工程师》
CAS
2024年第3期42-46,共5页
Chemical Engineer
基金
山东省科技攻关计划项目(2021CXGC084508)。
关键词
新型钝化剂
城市污泥
重金属
分布形态
稳定系数
new passivating agents
urban sludge
heavy metals
distribution morphology
stability coefficient
