摘要
随着河湖环保清淤工程的实施,大量清淤底泥的处理与处置已成为社会关注问题。为解决清淤底泥的资源化利用难题,以白洋淀生态清淤试点工程中的土工管袋脱水底泥为研究对象,在底泥分析的基础上,分别以河砂和蛭石作为改良剂,改善底泥的pH值、含盐量、有机质、质地、土壤入渗率5项主控指标。结果表明:河砂和蛭石均对底泥有改善作用,但蛭石对底泥质地改变不显著,同时考虑经济性、工程实操性等因素,选择河砂作为改良剂,添加比例为底泥质量(干质量)的25%~30%较为适宜,此时改良后绿化土的质地基本上处于壤土的范围内,最适宜于植物生长,且pH值、含盐量、有机质、入渗率等其余4项主控指标均能满足CJ T 340—2016《绿化种植土壤》的要求。同时,针对白洋淀生态清淤试点工程提出工程应用方案,为底泥资源化利用提供了新的思路。
With the implementation of environmental protection dredging project in rivers and lakes,the treatment and disposal of a large amount of dredging sediment has become a social concern.To solve the problem of sediment resources,the dewatered sediment from geo-tube bag in Baiyangdian ecological dredging pilot project was taken as the research object.Based on the analysis of sediment,river sand and vermiculite were used as amendments to improve the five main control indices of sediment,including pH,salt content,organic matter,textures and soil infiltration rate.The experimental results show that both river sand and vermiculite improve the sediment,but the sediment texture does not change significantly with the addition of vermiculite.Considering also the factors of economy and engineering,river sand is selected as the amendment.It is more suitable to add 25%to 30%of the sediment mass(dry mass),the texture of the improved afforested soil is basically within the range of loam soil,which is most suitable for plant growth.Besides,the other four main control indices such as pH,salt content,organic matter and infiltration rate can all meet the requirements of planting soil for greening stipulated in the code CJ T 340-2016.Furthermore,the project application scheme is put forward for the Baiyangdian ecological dredging pilot project,which provides a new idea for sediment resources.
作者
王苗苗
罗文琦
王琦
张汉卿
WANG Miao-miao;LUO Wen-qi;WANG Qi;ZHANG Han-qing(CCCC-TDC Environmental Engineering Co.,Ltd.,Tianjin 300461,China)
出处
《水运工程》
北大核心
2022年第S02期54-58,102,共6页
Port & Waterway Engineering
关键词
清淤底泥
资源化利用
种植土
改良剂
dredging sediment
resource utilization
planting soil
amendment
作者简介
王苗苗(1981-),女,硕士,高级工程师,从事环保疏浚及水环境治理技术研究。
