摘要
为探讨粉煤灰作为土壤改良剂的可行性,该文采用扫描电镜、能谱分析、XRD以及AAS等分析测试手段对其进行表征,测定了粉煤灰的容重、pH、有机质、速效磷、速效钾、全氮、全钾等理化指标,考察了重金属镉、铬、钴、镍、铅、锌、锰、铁和铜的全量、有效态含量和形态分析,并采用内梅罗综合指数法和Hakanson潜在生态危害指数法评估了粉煤灰的养分状况和污染风险。结果表明,粉煤灰pH值为8.6,显弱碱性。容重为0.51 g/cm^3且砂粒含量在85%以上较小,质地较为松散。参照土壤养分分级标准,速效磷和速效钾均达到三级水平,有机质达到四级水平,含量均较为丰富。Co、Cd、Cr、Ni、Zn、Pb和Cu这5种重金属元素含量多以残渣态存在,较为稳定,不易迁移转化,不会造成土壤重金属污染。粉煤灰的重金属内梅罗综合污染指数为1.39,评价标准为三级。潜在生态危害指数RI值为85.45,为轻微危害水平。综上所述,粉煤灰的养分含量较为丰富,作为改良剂可以有效提升土壤的肥力,促进动植物生长。
In order to explore the feasibility of using fly ash as a soil amendment,SEM,EDS,XRD and AAS were used to characterize it,and the bulk density,p H value,organic matter,available phosphorus and available potassium,total nitrogen,total potassium and other physical and chemical indicators of the fly ash were determined.The content and morphology of heavy metals Cd,Cr,Co,Ni,Zn,Fe,Pb,Cu and Mn were measured and analyzed.The potential ecological risk of fly ash was assessed by using the Nemerow comprehensive index method and Hakanson potential ecological risk index method.As the results showed,the pH value of fly ash was 8.6,which showed weak alkalinity.The bulk density is 0.51 g/cm^3 and the sand content is smaller than 85%,and the texture is looser.Compared with soil fertility index,available phosphorus and available potassium reached the Level Three,organic matter reached the Level Four,and the contents were abundant.The contents of Co,Cd,Cr,Ni,Zn,Pb and Cu existed in the residue state,which was more stable,and not easy to migrate and transform,and will not cause heavy metal pollution in soil.The Nemerow comprehensive pollution index of heavy metals in fly ash is 1.39,and the evaluation standard is Grade three.RI value of the potential ecological hazard index is 85.45,which is a slight hazard level.To sum up,the nutrient index content of fly ash is rich,which can effectively enhance soil fertility and promote the growth of animals and plants,and it is feasible as a soil modifier.
作者
武琳
郑永红
张治国
陈永春
邓永强
张磊
陈芳玲
WU Lin;ZHENG Yonghong;ZHANG Zhiguo;CHEN Yongchun;DENG Yongqiang;ZHANG Lei;CHEN Fangling(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Coal Mining National Engineering Technology Research Institute,Huainan 232033,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第9期219-227,共9页
Environmental Science & Technology
基金
国家自然科学基金资助项目(51904014)
安徽省高校自然科学研究项目(KJ2018A0072)
安徽省博士后基金项目(2019B337)
关键词
粉煤灰
土壤改良剂
养分
重金属
污染风险
fly ash
soil amendment
nutrients
heavy metals
pollution risk
