Study On Composting Effect And Application Of Green Plant Waste And Sewage Sludge

With the development of landscaping and the rate of sewage treatment increased year by year,the production of greening plant waste and sewage sludge is rising in recent years.Studying on composting of greening plant waste and sewage sludge,not only can obtain certain economic and ecological benefits,but also can reduce the pressure of city organic waste treatment.In order to know the composting effects of greening plant waste and sewage sludge and the application effects of the organic fertilizer composted by greening plant waste and sewage sludge,the composting effects of only greening plant waste regulated C/N and different proportion of greening plant waste and sewage sludge and the effect of applying organic fertilizer to soils were studied.Main results were listed as following:1.The progress,maturity time and effect of composting of greening plant waste unregulated C/N were bad.Regulating the C/N of greening plant waste to 32 can guarantee the composting process smoothly.After stacking 45 days the compost of it reached maturity and the effect of it was well.2.The composting progress of all different proportion of greening plant waste and sewage sludge gone smoothly.The different proportion of greening plant waste and sewage sludge had a significantly effect on composting effects.Increasing the amount of addition of sewage sludge promoted the temperature advancements,increased the maximum temperature and prolonged the high temperature period.The reducement of dissolved organic carbon and organic matter were increased.The accumulation of relative content of the total nitrogen were promoted after composting.However,the loss amount of absolute nitrogen of the high addition of sewage sludge was higher than the low addition of sewage sludge.Thus,the 3:4.5 ratio of greening plant waste and sewage sludge was suggested for the composting,considering maximizing the amount of treatment of the both kinds of wastes and getting better results of composting.3.The soil quality can be significantly improved by the addition of the compost made by greening plant waste and sewage sludge.However,the effects of different amount of addition of compost had significant differences.Increasing the amount of addition of compost promoted the ammonification and nitrification,increased the potential of nitrogen mineralization,increased the amount of nitrogen mineralization.At the same time,the carbon minerlization rate could be improved,and the amount of carbon mineralization increased.However,with the increase of the amount of compost,the loss of organic fertilizer nitrogen increased,and the carbon mineralization rate decreased,resulting in waste of organic fertilizer.Thus,the 10%~15% of the amount of organic fertilizer was suggested for adding to soils,considering saving the organic fertilizer and achieving better effects of fertilizing.