Effects Of Municipal Sewage Sludge On Wheat Yield And Quality Security And Farmland Environment

Urban sludge contains many toxic and hazardous substances.lfsludge is not treated and discharged directly into the ecological environment,it will cause serious pollution to the ecological environment.In recent years,the content of heavy metals in urban domestic sludge has been continuously reduced.A relatively good land-use method is to apply sludge to garden green land afier composting,in order to expand the use of sludge in land use.Afier composting the sludge,applying it to land use and agriculture and gardening is an important research direction for the sludge recycling.This experiment explored the effects of urban sewage sludge composting on wheat yield,quality,and soil fertility through field trials.The content of heavy metals in soil and wheat afier application of domestic sewage sludge compost and organic pollutants(PAHs)in wheat grain were studied.The phthalate ester content was studied.The results show that the application of sludge can significantly increase the yield of wheat.The increase inyield of wheat is more significant when the sludge is applied with chemical fertilizer.Compared with the blank,the yield increase was 83.85%~139.04%;the N in wheat plants afier sludge compost application.The contents of P,K and K all increased,but under thesame nutrient,with the increase of sludge application rate,the utilization ratio of K fertilizer in wheat plants was significantly increased,and the utilizan'on rate of N fertilizer was decreased;the use of domestic sludge could improve wheat The content of wet gluten and dry gluten in the grain can improve the quality of wheat.Under the same nutrient conditions,the application of domestic sludge can significantly increase the starch content of wheat;after the application of domestic sludge,the content of organic matter,total nitrogen,and available phosphorus in the soil The content of available potassium has been improved,the soil bulk density has been reduced,and the physical and chemical properties of the soil have been improved.The application of domestic sludge has increased the content of heavy metals in wheat plants and famrland soil to some extent,but the content has not exceeded the standard;alter the application of domestic sludge The content of PAHS organic pollutants and phthalate ester organic pollutants in wheat grains did not exceed the detection limit.Does not pollute the wheat.