磷石膏改性植生基质中有害物质的固化与污染控制

Solidification and Control of Harmful Substances in Plant Substrates Via Phosphogypsum Modified

为了研究改良剂对磷石膏基质的改良效果,在磷石膏植生基质中添加两种不同配比的改良剂,并在基质播种黑麦草,通过对基质的物理性质、黑麦草的生长指标以及渗滤液的部分指标进行测定并分析,探究不同配比改良剂的改良效果。结果表明,在基质的物理性质的改良效果上,T_(1)组的改良效果比T_(2)组的效果好;在对黑麦草生长影响上,经过改良后的基质更利于黑麦草生长,且T_(2)组效果好于T_(1)。基质的渗滤液实验结果表明,添加改良剂对基质pH值的提高和对基质的固定效果比较显著,pH的改良效果上T_(1)高于T_(2),对基质的固定T_(2)的效果略好于T_(1),在EC上添加改良剂的效果不明显。三组基质的渗滤液中Fe、Mn、Cu、Zn、Pb含量都呈现显著下降趋势,但改良基质中的重金属浓度下降速度更快。本研究结果可为磷石膏基质进行改良提供参考。

In order to study the improvement effect of the modification of phosphogypsum matrix,add two different ratio of matrix,and seeding ryegrass in the matrix,through the physical properties of the matrix,rye growth index and part of the leachate index determination and analysis,to explore the effect of different ratio of modifier.The results showed that the T_(1) group improved the physical properties of the matrix better than the T_(2) group,the growth of ryegrass and the T_(2) group was better than T_(1).The experimental results of the leachate of the matrix showed that the effect of pH and fixing the matrix,T_(1) was higher than T_(2),slightly better than T_(1),and the effect of adding amendments to EC.The Fe,Mn,Cu,Zn and Pb in the leachate of the three groups showed a decreasing trend,but the concentration of heavy metals in the modified matrix decreased faster.In this experiment,the addition of modification had a better fixation effect on heavy metals.The results of this study could provide a reference for the improvement of the phosphogypsum matrix.