Effect Of Sludge Compost On Growth Of Festuca Arundinacea.L And Soil Environment

In order to study the effect of sludge compost on the heavy metal environment and the effect of Festuca arundinacea.L,on the growth,this paper earried out the test of the undisturbed leaching soil column and the Festuca arundinacea.L pot experiment.(1)The undisturbed so1l column test:Taking the amount of composting as the variable,through the study on the effect of application amount on heavy metal content in soil,the migration of heavy metals in soil column was analyzed,single factor evaluation method was used to evaluate the quality of heavy metals in sludge compost and soil.The results showed that:The composting capacity of 3kg/m2 sludge did not pose a threat to the soil environment and leaching solution;The content of heavy metals in sludge compost should be analyzed before application;The contents of As and Cd in sludge composting must be strictly controlled before the application of heavy metals in sludge composting.(2)Festuca arundinacea.L pot experiment:The composting of garden waste was added to the sludge composting by adding additives,mixing different proportions of soil and compost,and the effects of Festuca arundinacea.L on the initial growth of mixed compost substrate were studied.The best matrix ratio was estimated by entropy weight method and TOPSIS method,at the same time,the feasibility of sludge compost in grassland utilization was evaluated.The results show that:Mixed matrix rate has inhibitory effect on Festuca arundinacea.L early germination,the highest germination rate was found in the treatment of=1:3 in municipal sludge compost and forest soil;The compost of pure sludge without garden waste and soil was used as the substrate for the growth of Festuca arundinacea.L,the initial growth and root fertility of the herb are the leading;With the gradual increase of sludge compost,the comprehensive evaluation index showed an increasing trend in the Potting compost,the B4 treatment was the maximum,the value of 0.71,which could be considered as the best ratio matrix.With the increase of the proportion of pure garden waste compost,the comprehensive evaluation index decreased gradually,C4 processing is the minimum(0.04),and compared with the B4 treatment is about 18 times.The following conclusions are drawn from the above tests:(1)The background values of heavy metals,such as soil,irrigation water and sludge compost should be strictly investigated;(2)The disposal method of sludge compost is feasible,but the dosage should be controlled within 3kg/m2;(3)Festuca arundinacea.L had good growth response to pure sludge compost;(4)The garden waste compost can be used as a part of the mixed matrix,and the threshold should be controlled in 0-0.5,which can partly replace peat.