摘要
通过建立模型试验观测垃圾焚烧飞灰对植物生长的影响并测定护坡基材重金属浸出液浓度,探究将飞灰掺入到公路护坡基材中实现资源化利用的可行性。结果表明:(1)当飞灰掺入量≤5%时,飞灰对狗牙根的早期萌发及幼苗的生长有促进作用,对边坡防护起到了积极作用,当飞灰掺入量>5%时会抑制狗牙根的萌发及生长,不利于边坡植被防护层的形成;(2)狗牙根在降低基材浸出液重金属离子浓度方面起到了积极作用,且基材中的水泥对飞灰中重金属离子有显著的固化作用,使护坡基材浸出液达到排放标准;(3)掺入量≤5%为适宜的飞灰掺量界限,可实现飞灰在公路边坡上的资源化利用。
The impact of fly ash on plant growth is observed and the concentration of heavy metal leachate in the slope protection substrate is measured through the model test to explore the feasibility of blending fly ash into the highway slope protection substrate in order to realize resource utilization.The results show that:(1)when fly ash content is less than 5%,the fly ash has a certain promoting effect on the early germination of Bermudagrass and the growth of seedling.It has a positive effect on the slope protection.When fly ash content is more than 5%,it would inhibit the germination and growth of Bermudagrass and is unfavorable for the formation of the slopes.(2)Bermudagrass plays an active role in reducing the concentration of heavy metal ions in the substrate leaching solution.Moreover,the cement in the substrate has significant curing effect on heavy metal ions in the fly ash,which can make the leaching liquid of the substrate reach the emission standard.(3)Incorporation less than 5%is an appropriate limit of fly ash content,which can realize the resource utilization of fly ash in highway slope protection.
作者
万娟
夏军
肖衡林
陶高梁
马强
WAN Juan;XIA Jun;XIAO Heng-lin;TAO Gao-liang;MA Qiang(Technology Research Center of Ecological Road Engineering,Hubei University of Technology,Wuhan 430068,China)
出处
《公路》
北大核心
2019年第11期224-228,共5页
Highway
基金
国家自然科学基金资助项目，项目编号51608182、51678223
湖北省教育厅2016创新团队项目，项目编号T201605
关键词
生态护坡基材
垃圾焚烧飞灰
重金属
资源化利用
ecological slope protection substrate
fly ash
heavy metal
resource utilization
