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堆存市政污泥深度脱水及其重金属稳定化效果研究

吴曰丰 池艳峰 张露 江帅 杨锡刚 赵旭远

吴曰丰,池艳峰,张露,等.堆存市政污泥深度脱水及其重金属稳定化效果研究[J].环境工程技术学报,2023,13(1):248-254 doi: 10.12153/j.issn.1674-991X.20210608
引用本文: 吴曰丰,池艳峰,张露,等.堆存市政污泥深度脱水及其重金属稳定化效果研究[J].环境工程技术学报,2023,13(1):248-254 doi: 10.12153/j.issn.1674-991X.20210608
WU Y F,CHI Y F,ZHANG L,et al.Study on deep dewatering and heavy metal stabilization of stocked sludge[J].Journal of Environmental Engineering Technology,2023,13(1):248-254 doi: 10.12153/j.issn.1674-991X.20210608
Citation: WU Y F,CHI Y F,ZHANG L,et al.Study on deep dewatering and heavy metal stabilization of stocked sludge[J].Journal of Environmental Engineering Technology,2023,13(1):248-254 doi: 10.12153/j.issn.1674-991X.20210608

堆存市政污泥深度脱水及其重金属稳定化效果研究

doi: 10.12153/j.issn.1674-991X.20210608
详细信息
    作者简介:

    吴曰丰(1977—),男,高级工程师,硕士,主要从事固废处理及生物质发电研究,wintonwu@126.com

  • 中图分类号: X705

Study on deep dewatering and heavy metal stabilization of stocked sludge

  • 摘要:

    堆存污泥具有高含水率和潜在重金属污染特征,对堆存填埋场及周边环境可能产生潜在生态风险。以秸秆(SP)、粉煤灰(FA)、磷石膏(PG)3种固体废物材料搭配2种常用脱水剂氧化钙(CaO)、聚合氯化铝(PAC)组成联合调理剂,对堆存污泥进行脱水以及对其中重金属进行稳定化效果研究,并通过电镜-能谱探究加入调理剂后污泥的微观结构及物质构成。结果表明:添加固体废物材料的联合调理剂对污泥脱水及重金属稳定化效果显著,其中添加PG的组合最优。当CaO、PAC、PG添加量(干基比)分别为20%、25%、23%时,毛细吸水时间为42.1 s,泥饼含水率为49.00%;PG中丰富的孔隙结构及磷酸盐物质对重金属有很好的吸附和沉淀作用;微观结构分析显示,经过调理后CaSO4或Al2(SO4)3构建了污泥的骨架结构。

     

  • 图  1  CaO-PAC-SP组合中PAC和SP添加量对污泥CST和泥饼含水率的影响

    Figure  1.  Effect of PAC and SP addition in Ca0-PAC-SP on the CST and moisture content of sludge cake

    图  2  CaO-PAC-FA中PAC和FA添加量对污泥CST和泥饼含水率的影响

    Figure  2.  Effect of PAC and FA addition in CaO-PAC-FA on the CST and moisture content of sludge cake

    图  3  CaO-PAC-PG中PAC和PG添加量对污泥CST和泥饼含水率的影响

    Figure  3.  Effect of PAC and PG addition in CaO-PAC-PG on the CST and moisture content of sludge cake

    图  4  原状污泥与CaO-PAC-PG调理后污泥扫描电镜照片

    Figure  4.  Scanning electron microscope of undisturbed sludge and sludge treated with CaO-PAC-PG

    图  5  CaO-PAC-PG调理后泥饼能谱图

    Figure  5.  Energy spectrum of sludge treated with CaO-PAC-PG

    表  1  堆存污泥中重金属浓度

    Table  1.   Heavy metal parameters of stocked sludge mg/kg 

    AsCdCrCuNiPbZn
    17.61.7119.8524.378.362.1802.9
    下载: 导出CSV

    表  2  3种脱水泥饼浸出液中的重金属浓度

    Table  2.   Heavy metal content in three kinds of leaching solution of dehydrated sludge cake mg/kg 

    重金属CaO-PAC-SPCaO-PAC-FACaO-PAC-PG
    As2.41.20.2
    Cd0.30.10.3
    Cr6.70.80.3
    Cu13.55.14.3
    Ni0.90.60.1
    Pb3.30.31.2
    Zn18.14.53.2
    下载: 导出CSV
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  • 收稿日期:  2021-10-22

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