Safety assessment of composting products derived from rural domestic waste processed through anaerobic/semi-aerobic bioreactors
For the resource utilization of domestic waste in the rural areas,the quality of composting and its feasibility of agricultural and forestry utilization were analyzed and discussed.The fertilization strategy of the composting was proposed by the leaching experiment as well.The results indicated that the mass ratio of organic matter and the total nutrient of the composting were 31.28％and 3.84％,respectively.The heavy metals in descending order was Cu(1 322.02 mg/kg),Pb(118.39 mg/kg),Cr(91.61 mg/kg)and Cd(8.81 mg/kg).After fertilizing the composting(one and a half years)with mass ratio of 15％,the soil quality met the relevant requirements but presented a slight ecological risk.During the leaching process,the concentration of total nitrogen and nitrate nitrogen in the leaching decreased exponentially,while ammonia nitrogen showed an increasing trend before decreasing,and its concentration leaching from the composting for one and a half years was significantly lower than that for one year(P＜0.01).Fertilizing one and a half years compost product in spring,rainy season and dry season,the total amount of total nitrogen dissolved in 10 000 m2 landscaping land was 24 534-31 783 g,which accounted for 10％of the initial total nitrogen content.Moreover,fertilizing in spring,the release amount and time of nitrogen were synchronized with the growth of crops,which was beneficial to the crops growth.
万方数据
维普
