Infiltration and storage characteristics and purification ability of new-type glass pumice to rainwater runoff
A new-type glass pumice was prepared by using waste glass,pyrite and engineering waste soil,to study the infiltration and storage characteristics of rainwater runoff and the pollutant removal effect of the bioretention system filled with five kinds of combined substrate(new-type glass pumice,glass pumice,zeolite,vermiculite and ceramic)according to two filling methods(layering,mixing)and different hydraulic retention time(5,10,20,30,40 h individually).The results showed that the water retention rate of each treatment was 48.97％-54.41％,and it had good permeability.There were certain differences in the purification effect of different treatments on each pollutant,and the average removal rates of total nitrogen(TN),ammonia nitrogen,total phosphorus(TP),chemical oxygen demand(COD)were 48.31％-84.90％,70.83％-91.09％,71.83％-90.78％,58.64％-74.32％,respectively.The new-type pumice treatment demonstrated best removal effect,its maximum removal rates of TN,ammonia nitrogen,TP and COD were 92.71％,92.81％,97.54％,86.84％,respectively,and the effluent quality could reached the V level standard of"Environmental quality standard for surface water"(GB 3838-2002).The removal rates of TN,TP and COD in the layered filling treatment were generally better than those in the mixed filling treatment,while the removal rates of ammonia nitrogen were the opposite.The substrate depth was significantly positively correlated with pollutant removal efficiency(P＜0.01).There was a significant negative correlation between hydraulic retention time and TP removal rate(P＜0.01),and there was no uniform optimal residence time.
pyriteglass pumicebioretention systemspermeability and storage characteristicspurification capacity
万方数据
维普
