改性磷石膏对污泥重金属迁移变化的影响机制  

Mechanisms of the effect of modified phosphogypsum on the change of heavy metal migration from sludge

作　　者：戴取秀[1] 胡瑶 马丽萍[1] 杨杰[1] 郭致蓥 敖冉 杨稔 郑大龙 谢龙贵[1] DAI Qu-xiu;HU Yao;MA Li-ping;YANG Jie;GUO Zhi-ying;AO Ran;YANG Ren;ZHENG Da-long;XIE Long-gui(School of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;College of Biology and Agricultural Sciences,Honghe University,Honghe 661199,China;Ecological and Environmental Engineering,College of Guizhou University for Nationalities,Guiyang 550025,China;Honghe Prefecture Ecological Environment Elements Guarantee Service Center,Honghe 654400,China;Zibo Vocational College,Zibo 255300,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]红河学院生物与农业科学学院,云南红河661199 [3]贵州民族大学生态环境工程学院,贵州贵阳550025 [4]红河州生态环境要素保障服务中心,云南红河654400 [5]淄博职业学院,山东淄博255300

出　　处：《中国环境科学》2024年第9期5063-5076,共14页China Environmental Science

基　　金：云南省基础研究专项(202301AU070060);中国博士后科学基金资助项目(2019M663578);云南省基础研究计划项目(202201AU070015);红河学院科研基金项目博士专项(XJ22B13);云南省地方本科高校基础研究联合专项资金资助项目(202101BA070001-246)。

摘　　要：利用马铃薯渣和磷石膏的混合固废渣制备双改性材料(D-MPR),将其用于处理污泥重金属.研究双改性材料制备条件,材料对污泥Zeta电位、胞外聚合物(EPS)及重金属迁移的影响;重点分析处理后污泥中重金属的生态风险,并构建重金属迁移模型.实验结果表明:固废渣(PR)在碱化温度50℃,十六烷基三甲基溴化铵(CTAB)用量为2%PR(PR质量),醚化温度50℃的条件下,进行3h醚化改性;后再添加1%PR的过硫酸铵,80%PR的丙烯酰胺(AM),并在50℃下反应3h进行接枝改性,可制备得到D-MPR.将D-MPR以占污泥干固体(DS)量12‰的比例投入污泥中处理其中重金属,发现与原污泥相比,约42.43%的非稳态Cd,60.42%的非稳态Cr,53.10%的非稳态Cu,67.58%的非稳态Pb,55.21%的非稳态Zn,34.23%的非稳态Ni和74.68%的非稳态As被固定到污泥泥饼当中,污泥泥饼中重金属的迁移风险和潜在生态风险系数均明显降低.此外,该研究还发现了非稳态重金属转化率随LB-EPS以及TB-EPS含量的增加而减小,随Zeta电位的升高而升高,并以此建立了非稳态重金属的转化模型.This study utilized a mixture of potato residues and phosphogypsum waste residue to prepare a dual-modified material(D-MPR), which was then used to treat heavy metals in sludge. The preparation conditions of the dual-modified material were studied, along with its effects on the Zeta potential of the sludge, extracellular polymeric substances(EPS), and the migration of heavy metals;the ecological risk of heavy metals in the treated sludge was analyzed, and a heavy metal migration model was constructed. Experimental results showed that the waste residue(PR) underwent etherification modification at an alkalization temperature of 50°C with 2% hexadecyl trimethyl ammonium bromide(CTAB) by PR mass, at an etherification temperature of 50℃ for 3hours;subsequently, by adding 1% PR of ammonium persulfate and 80% PR of acrylamide(AM), and reacting at 50℃ for 3hours for graft modification, D-MPR was prepared. By adding D-MPR at a proportion of 12‰ of the dry solids(DS) amount of the sludge to treat heavy metals, it was found that compared with the original sludge, approximately 42.43% of non-stable Cd, 60.42% of non-stable Cr, 53.10% of non-stable Cu, 67.58% of non-stable Pb, 55.21% of non-stable Zn, 34.23% of non-stable Ni, and 74.68% of non-stable As were immobilized into the sludge cake, significantly reducing the migration risk and potential ecological risk coefficients of heavy metals in the sludge cake. Furthermore, the study found that the conversion rate of non-stable heavy metals decreased with an increase in LB-EPS and TB-EPS content, and increased with an increase in Zeta potential, thereby establishing a conversion model for non-stable heavy metals. This research provides a solid research foundation for the study of sludge heavy metal treatment with solid waste-based materials and has significant practical importance for the detoxification of sludge.

关 键 词：污泥 重金属 磷石膏 马铃薯渣 污泥处理剂 

分 类 号：X705[环境科学与工程—环境工程]